Lunar and Planetary Institute






Sixteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Early Evolution of the Earth
Y. Abe, T. Matsui
  1001

Viking Lander i: a New Map of Rock and Soil Types
J. B. Adams, M. O. Smith, P. E. Johnson
  1002

Komatiites as Sources of High Magnesium Microtektites
W. N. Agosto
  1003

Liquidus Phosphorus Redox Reactions in Mesosiderite Silicates
W. N. Agosto
  1004

Accretion of the Earth's Water Budget and Atmospheric Cratering
T. J. Ahrens, J. D. O'Keefe, M. A. Lange
  1005

Cosmogenic Radionuclides AL-26 and MN-53 in Chondrites
V. A. Alexeev, V. V. Malyshev, A. K. Lavrukhina
  1006

Major and Trace Element Chemistry of the Mantle
D. L. Anderson
  1007

Zelda Revealed
J. T. Armstrong, I. D. Hutcheon, G. J. Wasserburg
  1008

The Relative Rates of Aeolian and Tectonic Processes on Venus and Mars
R. E. Arvidson, R. Kahn
  1009

10BE and 26AL Contents of Small Iron Meteorites
D. Aylmer, V. Bonanno, G. F. Herzog, J. Klein, R. Middleton
  1010

High Pressure Phases in Impactites of the Zhamanshin Crater/ussr
D. D. Badyukov
  1011

Lithospheric Strengths of the Terrestrial Planets
W. B. Banerdt, M. P. Golombek
  1012

Rb-Sr Internal Isochron Age of a Subophitic Basalt Clast from the Y75011 Eucrite
B. M. Bansal, C.-Y. Shih, H. Wiesmann, L. E. Nyquist, J. L. Wooden, H. Takeda
  1013

Solubility of Chromium in a Synthetic Bushveld/stillwater Parent Liquid at 1 ATM. as a Function of Temperature and Oxygen Fugacity
S. J. Barnes
  1014

The Experimental Determination of Partition Coefficients for CR Between Orthopyroxene and a Synthetic Bushveld/stillwater Parent Melt, as a Function of Oxygen Fugacity and Temperature: Implications for the Distribution of Chromite in Layered Intrusions
S. J. Barnes
  1015

In Search of the Moon's Indigenous Volatiles: Noble Gases and Nitrogen in Vesicular Lunar Glasses
B. L. Barraclough, K. Marti
  1016

A Pre-Galileo View of the Asteroid 29 Amphitrite
M. A. Barucci, M. Fulchignoni
  1017

Mineral Composition in Chondrules of Various Structural Types of Ordinary Chondrites
G. V. Baryshnikova, S. A. Stakheeva, K. I. Ignatenko, A. K. Lavrukhina
  1018

A Hypothesis for a Differentiated Very Surface of the Moon by Regolith Processes
A. Basu
  1019

Composition of Agglutinitic Glass. Part i: Method and New Data
A. Basu, D. S. McKay
  1020

Composition of Agglutinitic Glass. Part II: Rationale and Interpretation
A. Basu, D. S. McKay
  1021

Plagioclase Composition and the Mare Basalt Component in Apollo 16 Core 66001/2
A. Basu, D. S. McKay
  1022

A Cruciform Chromite in an Agglutinate in Lunar Soil 15271
A. Basu, G. Robinson, D. S. McKay
  1023

Asteroid 29 Amphitrite: Surface Mineralogy and Heterogeneity
J. F. Bell, M. J. Gaffey, J. C. Gradie, B. R. Hawke, T. B. McCord
  1024

Cohenite-Bearing Metallic Spherules in Ureilites: Petrology and Implications
J. L. Berkley, C. A. Goodrich
  1025

AR Adsorption and the Lunar Atmosphere
T. J. Bernatowicz, F. A. Podosek, F. E. Kramer
  1026

Azimuthal Distribution of the Grooves on Ganymede
R. Bianchi, R. Casacchia, P. Lanciano, S. Pozio
  1027

Collection in Space of Cometary Material by the Kmp-Comet Experiment
J.-P. Bibring, J. Borg, Y. Langevin, B. Rosenbaum, B. Vassent, P. Salvetat, Y. A. Surkhov
  1028

Solar Wind and Cosmic Ray Irradiation of Grains and Ices: Application to Erosion and Synthesis of Organic Matter in the Solar System
J.-P. Bibring, F. Rocard
  1029

Venus: Gravity, Topography, and Isostatic Compensation
B. G. Bills, W. S. Kiefer
  1030

Mare Basalt Genesis: Trace Elements and Isotopic Ratios
A. B. Binder
  1031

Clast Population Statistics of the Lunar Meteorite Yamato 791197--SAMPLE from a New Source Region of the Lunar Highlands?
A. Bischoff, D. Stoffler
  1032

First Results of a Multidisciplinary Analysis of the Haughton Impact Crater, Devon Island, Canada. II. Structural Geology
L. Bischoff, W. Oskierski
  1033

Topographic Variability of the Lowlands of Venus
P. Blake, P. Mouginis-Mark
  1034

Plans for a 1996 Mars Sample Return Mission
D. P. Blanchard, J. P. Devries, R. D. Bourke
  1035

The Difficulty of Modeling the Trapping and Desorption of Hydrogen Implanted in Insulator Grains
G. E. Blanford, P. Borgesen, M. Maurette, W. Moller, B. Monart
  1036

Regolith Breccias from Apollo 15 and 16: Petrology, Rare Gases, and FMR Maturity
D. D. Bogard, D. S. McKay, R. V. Morris, S. J. Wentworth, P. Johnson
  1037

Geochronology and Petrogenesis of VHK Basalts
D. D. Bogard, L. E. Nyquist, C. Y. Shih, B. M. Bansal, H. Wiesmann, P. Johnson
  1038

Extraterrestrially-Derived Magnesioferrite at the K-T Boundary, Caravaca, Spain
B. F. Bohor, E. E. Foord, P. J. Modreski
  1039

A Search for Shock-Metamorphosed Quartz at the K-T Boundary
B. F. Bohor, P. J. Modreski, E. E. Foord
  1040

Metallic Si-Fe Particles in the Devitrified Glass Sample 67629
R. Borchardt, R. Blaschke
  1041

Application of Controlled Explosive Loading Fixtures to the Study of Shock-Induced Color Change in Nontronite
M. B. Boslough, R. A. Graham
  1042

Composition of Apatite and Biotite from the Stillwater Complex, Montana: Evidence for Hydrothermal Transport of Pge and REE in Cl-Bearing Solutions
A. E. Boudreau, I. S. McCallum
  1043

Variation in Sulfur and Oxygen Fugacity Associated with Pge-Sulfide Mineralization, Stillwater Complex
A. E. Boudreau, I. S. McCallum
  1044

Discovery of Alpha-Quartz Inclusions in Ordinary Chondrites
M. Bourot-Denise, J. Fabries, C. Fieni, D. C. Smith, J. Touret, H. Boyer, P. Pellas
  1045

Subsurface Heating during Impact Basin Formation: Constraints from Thermal Contraction and Thermal Stress
S. R. Bratt, S. C. Solomon, J. W. Head
  1046

MG Isotopic Heterogeneities in Fine-Grained Ca-Al Inclusions
C. A. Brigham, D. A. Papanastassiou, G. J. Wasserburg
  1047

A New Mine of Cosmic Dust in the Melt Zones of the Greenland Ice CAP
D. E. Brownlee, L. Fehrenbach, C. Hammer, C. Jehano, M. Maurette, H. H. Thomsen
  1048

Non-Nebular Origin for CAI Rims
T. E. Bunch, S. Chang, P. Cassen, R. Reynolds, J. Lissauer
  1049

Sulphur Isotope Measurement of Meteorites by Stepped Combustion
R. Burgess, I. P. Wright, C. T. Pillinger
  1050

Late-Stage Komatiitic and Dacitic Volcanism in the Early Archean Barberton Greenstone Belt, South Africa
G. R. Byerly, D. R. Lowe
  1051

Pre-Compaction Irradiation of Meteorite Grains: Further Constraints
M. W. Caffee, J. N. Goswami, C. M. Hohenberg, T. D. Swindle
  1052

The Loss of Mantle Material from Mercury
A. G. W. Cameron
  1053

Particle Deceleration and Impact Residue Analysis Experiments for Sample Return Missions
F. Capaccioni, D. G. Dixon, J. A. M. McDonnell, R. P. Flavill
  1054

The Libration of a Satellite Caused by the Tidal Field of its Planet
M. Caputo
  1055

Capture Cells: Decoding the Impacting Projectile Parameters
W. C. Carey, J. A. M. McDonnell, D. G. Dixon
  1056

High Sensitivity Molecular and Elemental Analysis of Cometary Grains
G. C. Carle, B. C. Clark, B. J. O'Hara
  1057

Nitrogen Abundance and Isotopes in Lunar Breccias - a Progress Report
L. P. Carr, I. P. Wright, C. T. Pillinger
  1058

Heating of Cais in the Environment of an Accreting Body
P. Cassen, R. Reynolds, J. Lissauer, T. Bunch, S. Chang
  1059

U-Th Isotopic Studies on Meteorite ALHA81005 and Ibitira
J. H. Chen, G. J. Wasserburg
  1060

Further Investigations Into Lunar Palaeointensity Determinations
S. K. Chowdhary, D. W. Collinson, A. Stephenson, S. K. Runcorn
  1061

Sir-A Observations of a Silicic Shield Volcano in Bolivia
P. R. Christensen, R. Greeley
  1062

Determination of Martian Surface Composition by Thermal Infrared Spectral Observations
P. R. Christensen, H. H. Kieffer, S. Chase
  1063

Mineralogy of the "olivine" IR Class of Interplanetary Dust
R. Christofferson, P. R. Buseck
  1064

Impact Experiments in H2O Ice, II: Collisional Disruption
M. J. Cintala, F. Horz, S. Smrekar, F. Cardenas
  1065

Impact Experiments in H2O Ice, i: Cratering
M. J. Cintala, S. Smrekar, F. Horz, F. Cardenas
  1066

Fe/mg KD for Olivine/liquid in Chondrules: Effects of Cooling Rate
E.-H. Cirlin, L. A. Taylor, G. E. Lofgren
  1067

Lunar Sample Paleointensity, via the Irms Normalization Method
S. M. Cisowski, M. Fuller
  1068

Geochemical Differentiation of the Maria on the Early Moon
P. E. Clark
  1069

Radar-Derived Morphology of Linear Features on Mercury
P. E. Clark, R. F. Jurgens
  1070

Interstellar 26AL and Excess 26MG
D. D. Clayton
  1071

Oxygen Isotopes in Chondrules from Enstatite Chondrites: Possible Identification of a Major Nebular Reservoir
R. N. Clayton, T. K. Mayeda
  1072

The Thermal Conductivity of the Martian Crust
S. M. Clifford, F. P. Fanale
  1073

A Model for Trace Element Partitioning: Orthopyroxene and Melt
R. O. Colson, G. A. McKay, L. A. Taylor
  1074

Gas-Driven Water Volcanism and Resurfacing on Europa
G. D. Crawford, D. J. Stevenson
  1075

Evidence for an Oscillatory Nucleation Mechanism from Macrorhythmic Units in the Stillwater Complex
L. J. Criscenti, I. S. McCallum
  1076

A New Scenario for Differentiation of Ganymede and Callisto: Beauty is Only Skin Deep
S. K. Croft
  1077

Rim Structures in Lunar Craters and Basins: New Constraints on the Origin of Asymmetric Basin Rings
S. K. Croft
  1078

Ganymede's Crust: Structural Indicators in the Tiamat Sulcis Quadrangle
S. K. Croft, R. G. Strom
  1079

Spectral Properties of Plagioclase and Pyroxene Mixtures
D. A. Crown, C. M. Pieters
  1080

An Olivine-Rich Earth-Crossing Asteroid: Source of Pallasites?
D. P. Cruikshank, W. K. Hartmann, D. Tholen, J. Bell
  1081

The Search for Igneous Minerals at the Viking Lander Sites
M. Dale-Bannister, R. Arvidson, R. Singer, E. Bruckenthal
  1082

Isotopic Provenance of Aluminous Mare Basalts from the Fra Mauro Formation
E. J. Dasch, C.-Y. Shih, B. M. Bansal, H. Wiesman, L. E. Nyquist
  1083

Refractory Inclusions in the Ornans C3O Chondrite
A. M. Davis
  1084

A Petrologic Province Map of the Lunar Highlands from Orbital Geochemical Data
P. A. Davis, P. D. Spudis
  1085

Uranium, Plutonium, and REE in Ordinary Chondrites
S. de Chazal, G. Crozaz, E. Zinner
  1086

Ridged Plains of Lunae Planum: Thickness Distribution Revised
R. A. de Hon
  1087

Thickness of Ridged Plains Materials in Hesperia Planum, Mars
R. A. de Hon
  1088

The Karoonda Chondrule Corundum Conundrum
J. S. Delaney, C. P. Stokes, C. O'Neill, M. Prinz
  1089

Mare Volcanic Glasses, i: Major-Element Data
J. W. Delano
  1090

Mare Volcanic Glasses, II: Abundances of Trace NI and the Composition of the Moon
J. W. Delano
  1091

Siderophile Elements in the Earth's Upper Mantle: Secular Variations and Possible Cause for Their Overabundances
J. W. Delano, K. Stone
  1092

A Possible Test of the Impact Theory for the Origin of the Moon
T. Dickinson, H. E. Newsom
  1093

Surface Chemistry of the Particles of Sample 74220: Many-Electron Effects in the Structure of ESCA Spectra
Yu. P. Dikov, O. A. Bogatikov, A. V. Ivanov
  1094

Electron Microprobe and INAA Analyses of Major and Trace Element Content for Six Georgiaites
B. D. Dod, P. P. Sipiera, H. Povenmire
  1095

On the Planet Uranus Magnetic Field
Sh. Sh. Dolginov
  1096

On the Problem of Lunar Paleomagnetism
Sh. Sh. Dolginov
  1097

Grain Size Determination at the Surface of Mars
A. Dollfus, M. Deschamps
  1098

The Influence of Dust Transport and Temperature Conditions in the Preplanetary Solar Nebula on C/o Variations in the Nebular Gas
V. A. Dorofeyeva, A. B. Makalkin
  1099

Electrical Conductivity of Carbonaceous Chondrites and T-Tauri (electromagnetic) Heating of the Asteroids
A. Duba, E. Didwall, G. J. Burke, E. L. Arnold, C. Sonnett
  1100

Rheology of the High Pressure H2O Ices ii, III, and V
W. B. Durham, S. H. Kirby, H. C. Heard
  1101

The Theoretical Determination and Experimental Effects of Cooling History on Silicate Glasses
M. D. Dyar, D. P. Birnie, M. T. Naney, S. E. Swanson
  1102

Crystal Chemistry and Origin of Blue Color in Meteoritic Hibonites: Evidence from Mossbauer Spectra of 57FE-DOPED Analogues
M. D. Dyar, V. L. Ryan, R. G. Burns
  1103

Recognition of Tectonic and Erosional Morphologies on Earth Using Recently Available Topographic and Bathymetric Averages
M. H. Edwards, R. E. Arvidson, J. R. Heirtzler
  1104

Trace Elements in Petrographically Distinct Components of Allende Inclusions
V. Ekambaram, A. Hashimoto, A. M. Davis, L. Grossman
  1105

New Mapping-Quality Photographs of the Earth and Their Applications to Planetary Comparisons
F. El-Baz
  1106

Max und Moritz: Two Refractory Inclusions from Grosnaja (CV3) Carbonaceous Chondrite
A. El Goresy, H. Palme, B. Spettel, M. Bukovanska
  1107

The Plate-Orogenic Theory and its Application to Planets
E. M. El Shazly
  1108

"informed Speculation" Regarding Thin-Skin Tectonics, Back-Arc Extension, and Volcanism on Venus
W. E. Elston
  1109

53-MN in a Slab of the Lost City Meteorite
P. Englert
  1110

Anomalous Mass Fractionation in Distillation: Implications the Early History of Meteorites and the Solar System
T. M. Esat, R. H. Spear, S. R. Taylor
  1111

The Unknown (un) Part of FUN Revealed
T. M. Esat, R. H. Spear, S. R. Taylor
  1112

Early Exposure of Minerals from Gray Soil 74261
O. Eugster
  1113

The Thickness of Lava Flows in Mare Tranquillitatis and Mare Procellarum
O. Eugster
  1114

Nd-Isotopic Evidence for the Origin of the Sudbury Complex by Meteoritic Impact
B. E. Faggart, A. R. Basu, M. Tatsumoto
  1115

Ion Probe and Track Studies of CM Hibonites: 26AL, 244PU, and REE
A. J. Fahey, J. N. Goswami, K. D. McKeegan, E. Zinner
  1116

Ion Probe Measurements Reveal Large TI Isotopic Effects in CM Hibonites
A. J. Fahey, J. N. Goswami, K. D. McKeegan, E. Zinner
  1117

Global Distribution and Migration of Subsurface Ice on Mars
F. P. Fanale, J. R. Salvail, A. P. Zent, S. E. Postawko
  1118

Oxidation State Indicators for the Solar Nebula
B. Fegley
  1119

Behaviour of Fluid Components in the Process of Shock Metamorphism
V. I. Feldman, F. A. Letnikov
  1120

Fluid Inclusions in Quartz and Phosphates of Ordinary Chondrites: More Data
C. Fieni, M. Bourot-Denise, P. Pellas, J. Touret, F. Robert
  1121

Field Measurements of 1983-84 Lava Flows at Kilauea and Mauna Loa Volcanoes: Basis for a Comparison with Mars
J. Fink, J. Zimbelman
  1122

Uranium-Series Dating of Allan Hills Ice
E. L. Fireman
  1123

The Unusual Xenon in Acid-Resistant Residues of the Efremovka CV Chondrite
A. V. Fisenko, D. Vu Minh, L. F. Semionova, Yu. A. Shukolyukov, A. K. Lavrukhina
  1124

Rare Gases in Terrestrial Rocks: Mantle Heterogeneity or Atmospheric Contamination?
D. E. Fisher
  1125

Experimental Study of Fe-Si Equilibria in the Metal Phase Enstatite Chondrites
R. A. Fogel, M. J. Rutherford, P. C. Hess
  1126

Nitrogen Isotopes by Laser Probe Extraction
I. A. Franchi, E. K. Gibson, I. P. Wright, C. T. Pillinger
  1127

Distribution and Properties of Large Symmetric Knobs on Mars
H. Frey, J. Middleton, A. M. Semeniuk
  1128

The Highland Boundary Scarp on Mars: Distribution of Characteristic Structures
H. Frey, A. M. Semeniuk
  1129

Impact-Induced Volatile Loss from a Carbonaceous Chondrite: Implications for Planetary Accretion
B. Frisch, J. A. Tyburczy, T. J. Ahrens
  1130

40AR-39AR Age of Lunar Basalt and Anorthositic Rocks
M. M. Fugsan, D. V. Vu Minh, L. S. Tarasov, Yu. A. Shukolyukov
  1131

A Paradigm for the S-Type Asteroids: Implications for the Evolutionary History of the Inner Belt and the Search for the Ordinary Chondrite Parent Bodies
M. J. Gaffey
  1132

Blockfields on Planetary Surfaces
J. B. Garvin
  1133

On the Role of MN and TI at the Surface of Venus
J. B. Garvin
  1134

High Dielectric Surfaces on the Terrestrial Planets
J. B. Garvin
  1135

On the Origin of High Radar Reflectivity Surfaces on Venus
J. B. Garvin, J. W. Head, S. H. Zisk
  1136

Some Geochemical Consequences of the Earth's Impact Differentiation
M. V. Gerasimov, L. M. Mukhin
  1137

Nitrogen Isotopic Composition of Archean Samples: Evidence of the Earth's Early Atmosphere?
E. K. Gibson, L. P. Carr, C. T. Pillinger
  1138

Small-Scale Compositional Heterogeneities in Stillwater Anorthosite II
E. C. Gitlin, P. A. Salpas, I. S. McCallum, L. A. Haskin
  1139

Late Eocene Silicate Spherules: Geographical Distribution, Description, and Relationship to North American Tektites
B. P. Glass
  1140

Europa: Geologic Implications of Spectrophotometry
M. Golombek, B. Buratti
  1141

Clay Minerals in Meteorites: Preliminary Identification by Analysis of Goodness-Of to Calculated Structural Formulas
J. L. Gooding
  1142

Minor Elements in Ureilites: Evidence for Reverse Fractionation and Interstitial Silicate Liquids
C. A. Goodrich, J. L. Berkley
  1143

Ion Microprobe Analysis of REE in Phosphates in the Apatite-Rich Clast from ALHA81005
C. A. Goodrich, G. J. Taylor, K. Keil, S. J. B. Reed, W. V. Boynton, D. H. Hill
  1144

Troctolites, Aluminous Mare Basalts, and Other Clasts from 14304
C. A. Goodrich, G. J. Taylor, K. Keil, P. H. Warren, G. W. Kallemeyn
  1145

Carbon in Basaltic Achondrites: a Preliminary Investigation
M. M. Grady, C. T. Pillinger
  1146

The Carbon Isotopic Composition of Winonaites and Forsterite Chondrites
M. M. Grady, C. T. Pillinger
  1147

Radar Characteristics of Small Craters: Implications for Venus
R. Greeley, P. Christensen, J. F. McHone
  1148

Rolling as a Possible Mode of Wind Transport on Venus and Resulting Bedforms
R. Greeley, J. Marshall
  1149

Lava Flows in Southwest Tharsis: Modes of Emplacement
R. Greeley, E. Theilig
  1150

Periodic Cometary Showers: Real or Imaginary?
R. A. F. Grieve, V. L. Sharpton, A. K. Goodacre, J. B. Garvin
  1151

Tectonic Tests of Proposed Polar Wander Paths for Mars and the Moon
R. E. Grimm, S. C. Solomon
  1152

Morphogenetic Regions of Terrestrial-Like Planets
P. K. Grogger
  1153

Chemical Evolution of the Matrix from Semarkona
J. N. Grossman
  1154

Experimental Condensation of Crystalline Olivine and Pyroxene
L. Grossman, A. Hashimoto, E. A. King
  1155

Dust Emission of Periodic Comet Halley at Large Heliocentric Distances
E. Grun, G. Schwehm, L. Massonne, J. Fertig, U. Graser
  1156

On the Latitudinal Distribution of Debris in the Northern Hemisphere of Mars
E. A. Guinness, R. E. Arvidson, C. E. Leff
  1157

Boltysh Astrobleme: Impact Crater Pattern with a Central Uplift
E. P. Gurov, H. P. Gurova
  1158

First Results of Multidisciplinary Analysis of the Haughton Impact Crater, Devon Island, Canada. V. Seismic Studies
Z. Hajnal, D. Scott, J. Pohl, P. B. Robertson
  1159

Carbon Isotopes in Bulk Carbonaceous Chondrites
J. Halbout, T. K. Mayeda, R. N. Clayton
  1160

Disulfur Monoxide and the Spectra of io and Venus
B. W. Hapke, F. G. Graham
  1161

Mercury Radar Altimetry: New Results
J. K. Harmon, D. B. Campbell, D. L. Bindschadler, J. W. Head, I. I. Shapiro
  1162

288 Glauke and 1220 Crocus: Precessing Binary Asteroids?
A. W. Harris, R. P. Binzel
  1163

Lunar Origin: New Work on the Impact-Trigger Hypothesis
W. K. Hartmann
  1164

Sem-Petrography of Allende Fine-Grained Inclusions
A. Hashimoto, L. Grossman
  1165

Petrogenesis of Stillwater Anorthosites of the Middle Banded Zone: Causes of Geochemical Trends
L. A. Haskin, P. A. Salpas
  1166

Remote Sensing Studies of Endogenic and Exogenic Dark-Haloed Craters on the Moon
B. R. Hawke, J. F. Bell, L. R. Gaddis, P. G. Lucey
  1167

Spectral Studies of the Highlands around the Nectaris Basin: Preliminary Results
B. R. Hawke, P. G. Lucey, J. F. Bell, P. D. Owensby, P. D. Spudis, P. A. Davis
  1168

Tectonism and Volcanism on the Southern Slopes of Ishtar Terra, Venus
J. W. Head, D. B. Campbell, S. H. Zisk
  1169

Olympus Mons Aureole: Evidence for Extensional and Compressional Deformation Associated with Emplacement
J. W. Head, N. G. Carras
  1170

A Model for the Production of Chemical Non-Mass Oxygen Isotope Effects
J. E. Heidenreich, M. H. Thiemens
  1171

The Geological Scale of Photometrically Derived Surface Roughness
P. Helfenstein
  1172

Photometric Constraints on the Emplacement and Evolution of Terrains on Ganymede
P. Helfenstein, L. Wilson
  1173

On Forming the Moon in Geocentric Orbit: Dynamical Evolution of a Circumterrestrial Planetesimal Swarm
F. Herbert, D. R. Davis, S. J. Weidenschilling
  1174

Petrologic Data for Antarctic Mesosiderites
R. H. Hewins
  1175

Phase Separation in Plagioclase-Poik Mesosiderites
R. H. Hewins, T. A. Harriott
  1176

Isotopic Systematics of Neon in Sieve Fractions of Disaggregated Allende Meteorite
D. Heymann, R. L. Palme
  1177

Carbon Concentration Mapping in a Surface of the Allende Meteorite
D. Heymann, R. Vis, Chr. V. D. Stap
  1178

Geologic Signatures of Large Impacts in the Terrestrial Ocean
A. R. Hildebrand, W. V. Boynton
  1179

Ion Microprobe Determination of REE and Other Trace Elements in Meteoritic Hibonite
R. W. Hinton, A. M. Davis, D. E. Scatena-Wachel
  1180

Ion Microprobe Measurement of Calcium and Magnesium Isotopic Mass Fractionation in Refractory Inclusions
R. W. Hinton, A. M. Davis, D. E. Scatena-Wachel
  1181

An Assignment of Photon Absorptions to FE2+ and CR3+ in Pyroxenes and Olivine by Crystal Field Theory
T. Hiroi, M. Miyamoto, Y. Takano
  1182

Magmas as Semipermeable Membranes Between Planetary Interiors and Surfaces
J. R. Holloway, S. Jakobsson
  1183

Lunar Density Models Consistent with Mantle Seismic Velocities and Other Geophysical Constraints
L. L. Hood, J. Jones
  1184

Experimental Regolith Evolution: Differential Comminution of Plagioclase, Pyroxene and Olivine
F. Horz, M. J. Cintala, S. Olds, T. H. See, F. Cardenas
  1185

Collisional Fragmentation of Granodiorite Targets by Multiple Impact Events
F. Horz, M. J. Cintala, T. H. See, F. Cardenas, T. D. Thompson
  1186

Additional Evidence Pointing to the Formation of Allende Matrix by in Situ Alteration
R. M. Housley
  1187

Occultation Detection of a Neptune Ring Segment
W. B. Hubbard, A. Brahic, P. Bouchet, L.-R. Elicer, R. Haefner, J. Manfroid, F. Roques, B. Sicardy, F. Vilas
  1188

Occultation Diameter of Asteroid 1 Ceres
W. B. Hubbard, L. A. Lebofsky, D. M. Hunten, H. J. Reitsema, B. H. Zellner, R. Goff, R. Marcialis, M. Sykes, J. Frecker, A. Sanchez, H. Rios, M. Izaguirre
  1189

Whole-Rock INAA Elemental Abundances and REE Variations in EH4, EH5, and EL6 Chondrites
S. S. Hughes, R. A. Schmitt
  1190

Zr/hf Ratios in Lunar Mare Basalt Groups -- Interim Report #2
S. S. Hughes, R. A. Schmitt
  1191

Freeze/thaw Injection of Dust Into the Martian Atmosphere
R. Huguenin, S. Harris, R. Carter
  1192

Primary Minerals on Detection by Intelligent High or Derivative Spectroscopy
R. Huguenin, J. Jones
  1193

Variation of Viscosity with Temperature and Composition in the Plagioclase System
W. Hummel, J. Arndt
  1194

Isotopic Anomalies and Homogenization in the Early Solar System
G. R. Huss
  1195

Isotopic Studies of mg, ca, fe, mo, and RU in Fremdlinge
I. D. Hutcheon, J. T. Armstrong, G. J. Wasserburg
  1196

The Kaidun IV Enstatite Chondrite: Significance for the Classification of the Enstatite Chondrite Clan
A. V. Ivanov, A. A. Ulyanov
  1197

Effect of Density Ratio: Threshold Speeds on Venus
J. Iverson, R. Greeley, J. Marshall, R. Leach, B. White
  1198

Preplanetary-Nebula Solid Matter Formation and Composition of Chondrites
M. N. Izakov
  1199

Interpretation of Remote-Sensing Observations of Mars
B. M. Jakosky, P. R. Christensen
  1200

Ree-Rich Pristine Alkali Gabbronorite from Breccia 67975
O. B. James
  1201

Petrology of a Complex Clast of Ferroan Anorthosite from Breccia 64435
O. B. James, M. K. Flohr
  1202

A Relative Time Scale for Channeling Events in the Oxia Palus/margaritifer Sinus Region, Mars
D. R. Janke
  1203

Ion Microprobe Analyses of Simulated LDEF Impact Residues
E. Jessberger, H. Kuczera, G. Lange, S. Sutton, E. Zinner
  1204

Pyroxene Compositions in the Most Reduced Chondrules of Uoc's as a Measure of O/h in the Nebula
M. C. Johnson
  1205

Io's Hotspots and Heat Flow: Constraints from Voyager and Telescopic Observations
T. V. Johnson, D. L. Matson, G. J. Veeder, R. H. Brown, L. A. Soderblom, A. S. McEwen
  1206

The Youngest Meteorites: I. a 180 M.Y. Igneous Age for the Shergottites -- the Constraint of Petrography
J. H. Jones
  1207

The Youngest Meteorites: III. Implications of 180 M.Y. Igneous Activity on the SPB
J. H. Jones
  1208

The Youngest Meteorites: II. Trace Element Zoning in Zagami Maskelynite
J. H. Jones, T. M. Benjamin, M. Hollander, J. Conner
  1209

Experiments Bearing on the Formation and Primordial Differentiation of the Earth
J. H. Jones, M. J. Drake
  1210

Late Sedimentation and Late Sediments in the Northern Lowlands on Mars
H.-P. Jons
  1211

Submicroscopic Weathering of Antarctic Meteorites?
S. Jovanovic, G. W. Reed
  1212

Ordinary Chondrite Falls and Congeners from Victoria Land, Antarctic: Derivation from Different Parent Regions
P. W. Kaczaral, J. E. Dennison, D. W. Lingner, M. E. Lipschutz
  1213

Fractionation of Volatile Components by Degassing of "magma Ocean"
A. A. Kadik, O. A. Lukanin
  1214

Behaviour of Some Meteoritic Material Indicator Elements in Process of Impact Melt Degassing
I. G. Kapustina, V. I. Feldman, G. M. Kolesov
  1215

Absolute TI Isotope Abundances in Whole Meteorites and in Refractory Inclusions
P. Kastenmayer, D. A. Papanastassiou, G. J. Wasserburg
  1216

Granulite Xenoliths from the Geronimo Volcanic Field, se Arizona: Evidence for a Heterogeneous Lower Crust Beneath the Southwestern, U.S.
P. D. Kempton, B. L. Weaver, R. S. Harmon, D. Blanchard, J. G. Fitton, J. Hoefs, S. Moorbath
  1217

Noble Gases from a Continental Hot Spot: the Yellowstone Caldera
B. M. Kennedy, J. H. Reynolds, S. P. Smith
  1218

Nitrogen Isotopes in Lunar Regolith: a Continuing Puzzle
J. F. Kerridge
  1219

Measurement and Interpretation of D/h in Meteorites: a Reappraisal
J. F. Kerridge, R. Shipp, S. Chang
  1220

Examination of Returned Solar-Max Surfaces for Impacting Orbital Debris and Meteoroids
D. J. Kessler, H. A. Zook, A. E. Potter, D. S. McKay, U. S. Clanton, J. L. Warren, L. A. Watts, R. A. Schultz, S. L. Schramm, S. J. Wentworth, G. A. Robinson
  1221

Spectral Reflectance Measurements of Shock-Loaded Geologic Materials
T. V. V. King, F. Horz
  1222

A Model to Determine the Spectral Reflectances of Mineral Mixtures
M. Kinoshita, M. Miyamoto, Y. Takano
  1223

Radiogenic 129XE in Individual Minerals in Allende as Studied with a Laser Microprobe
C. Kirschbaum
  1224

Surface Morphology of Valley Networks Formed by Sapping
R. C. Kochel
  1225

Attention: FULGURITE!
G. G. Kochemasov
  1226

Enigmatic Earthquake in Guinea (conakry): a Sign of Longevity of the AR2-PR Fosses on Face of Stable Archean Cratons
G. G. Kochemasov
  1227

A Moldavite from Stainz (styria, Austria): the Moldavite Strewn Field Revisited
C. Koeberl
  1228

Geochemistry of Muong Nong Type Tektites Vii: Chemistry of Dark and Light - Results
C. Koeberl
  1229

Geochemistry of Muong Nong Type Tektites Viii: Short Discussion of Some Correlation Diagrams
C. Koeberl, F. Kluger, W. Kiesl
  1230

High-Temperature Oxidizing Conditions in the Solar Nebula: the Evidence from fe, co, and NI Abundances in Allende Inclusions
A. S. Kornacki
  1231

The Relative Volatility of Refractory Trace Elements in Allende Cai's
A. S. Kornacki
  1232

Group II Cai's: an Isotopic Case for Presolar Chemistry?
A. S. Kornacki, B. Fegley
  1233

Geochemical Survey of Apollo 15 Regolith Breccias
R. L. Korotev
  1234

Geochemical Survey of Apollo 16 Regolith Breccias
R. L. Korotev
  1235

Track Study of Kaidun Meteorite Minerals
N. N. Korotkova, G. G. Ruchman, A. Ya. Skripnik, N. N. Kononkova, A. Lavrukhina
  1236

Radar Characterization of the Venusian Surface by an Unsupervised Classifier
R. C. Kozak, P. A. Davis
  1237

Why do Some Chondrules have High Primary Feo Contents?
A. Kracher
  1238

Heterogeneity of O/h in the Solar Nebula, as Indicated by Mafic Mineral Compositions in Chondrules
D. A. Kring
  1239

Allende Chondrules: Distillations, Condensations, and Metasomatisms
G. Kurat, H. Palme, F. Brandstatter, B. Spettel, V. P. Perelygin
  1240

Cretaceous-Tertiary Spinels: High Temperature Relicts from a Major Accretionary Event
F. T. Kyte, J. Smit
  1241

Thermochemical Response of Meteoritic Metal Phase to Heating in Air
B. Lang, A. Grodzinski, L. Stoch
  1242

Chemistry of the Apollo 12 Highland Component
J. C. Laul
  1243

Meteorites with Multi-Stage Irradiation by Galactic Cosmic Rays
A. K. Lavrukhina
  1244

Refractory Metal Inclusions in Kainsaz CO Chondrite: Their Detection and Elemental Composition
A. K. Lavrukhina, A. Yu. Ljul, G. M. Kolesov, P. A. Korovajkov
  1245

Seasonal and Secular Variation of the SOLIS Lacus Albedo Feature: Relation to the Martian Dust-Transport Cycle
S. W. Lee
  1246

Production Rates of Neon and Xenon Isotopes by Energetic Neutrons
D. A. Leich, R. J. Borg, V. B. Lanier
  1247

Determination of the Ree-Containing Mineral Phase of Enstatite Achondrites
P. M. Lemoine, M. M. Strait
  1248

Electrolysis of Simulated Lunar Melts
R. H. Lewis, D. J. Lindstrom, L. A. Haskin
  1249

Compositional Distinctions among Lunar Granulites
M. M. Lindstrom
  1250

REE in Phosphates from Lunar Highlands Cumulates: an Ion Probe Study
M. M. Lindstrom, G. Crozaz, E. Zinner
  1251

Geochemistry and Petrology of Clasts from North Ray Crater Breccia 67015
M. M. Lindstrom, U. B. Marvin
  1252

Devitrification and the Thermoluminescence Properties of Type 3 Chondrites
G. E. Lofgren, R. K. Guimon, D. W. G. Sears
  1253

Dynamic Crystallization Experiments on Chondrule Melts of Porphyritic Olivine Composition
G. Lofgren, W. J. Russell
  1254

Chondrule-Like Particles Provide Evidence of Early Archean Meteorite Impacts, South Africa and Western Australia
D. R. Lowe, G. R. Byerly
  1255

Young Volcanic Deposits in the Valles Marineris, Mars
B. K. Lucchitta
  1256

Three Compositional Anomalies at the Aristarchus Region: Surface Expression of a Possible Excavated Plutonic Complex
P. G. Lucey, B. R. Hawke
  1257

Influence of the Redox Regime upon the Melting of the Upper Mantle Rocks in the Presence of the Volatile Components of the C-O System
O. A. Lukanin, A. A. Kadik
  1258

Chemically Anomalous Objects in Type 4-6 Ordinary Chondrites: Evidence for Ubiquitous Brecciation Following Metamorphism
D. Lusby, E. R. D. Scott, K. Keil
  1259

Behavior of Noble Gases in Silicate Liquids: Preliminary Results
G. Lux
  1260

Diffusional Fractionation in the Outer Layers of the Sun
J. M. D. MacElroy, O. K. Manuel
  1261

A - Olivine-Pleonaste Refractory Inclusion from Karoonda
G. J. MacPherson, J. S. Delaney
  1262

Intervals of Temperature Variations in the Preplanetary Solar Nebula
A. B. Makalkin, V. A. Dorofeyeva, S. P. Borunov
  1263

Magmatic Iron Meteorites: Definition of Elemental Partitioning in the System Fe-Ni
D. J. Malvin, J. H. Jones, M. J. Drake
  1264

Radar Study of a Basaltic Lava Plain: Craters of the Moon, Idaho
L. Martel, R. Greeley
  1265

Improved Access to Martian Infrared Radiometry/spectroscopy Datasets
T. Z. Martin, H. H. Kieffer
  1266

Early Evolution of Venus and Mars
T. Matsui, Y. Abe
  1267

The Mars Ancient Cratered - Plains Boundary: Implications of Viking Color Data for Evolution of the Amenthes Region
T. A. Maxwell, T. R. Watters
  1268

Topography and Albedo of Ius Chasma, Mars
A. S. McEwen
  1269

Volcanic Hot Spots on Io: the Roles of Sulfur and Silicates
A. S. McEwen
  1270

Discovery of a Resurgent Caldera in Bolivia from Landsat
A. S. McEwen, P. R. Christensen, R. Greeley
  1271

Age and Origin of Large Martian Polygons
G. E. McGill
  1272

Mineralogy of Chondritic Porous Aggregates: Current Status
D. S. McKay, F. J. M. Rietmeijer, I. D. R. MacKinnon
  1273

Disaggregation of Regolith Breccias from Apollo 15 and 16
D. S. McKay, S. J. Wentworth, G. A. Robinson
  1274

Clinopyroxene REE Distribution Coefficients for Shergottites: REE Content of the Shergotty/zagami Melts
G. McKay, J. Wagstaff
  1275

Ilmenite Partitioning Revisited: Confirmation of Zirconium Results for High-Ti Mare Basalts
G. McKay, J. Wagstaff
  1276

Ejecta Blanket Scaling on the Moon and - Inferences for Projectile Populations
W. B. McKinnon, P. M. Schenk
  1277

What we Know about Mars (but Otherwise Wouldn't) if it is the Shergottite Parent Body
H. Y. McSween
  1278

Impact-Ejected Spalls from Layered Targets
H. J. Melosh
  1279

The Road to Panspermia: Impact Ejection of Living Organisms Into Space
H. J. Melosh
  1280

When Worlds Collide: Jetted Vapor Plumes and the Moon's Origin
H. J. Melosh
  1281

The Interaction of the Interstellar Carbon with Water Vapour in the Preplanetary Nebula and Some Cosmochemical Consequences
R. A. Mendybaev, N. S. Kuyunko, A. K. Lavrukhina, I. L. Khodakovsky
  1282

High Energy Accelerator Bombardments Simulating Planetary Gamma-Ray Production by Cosmic Rays
A. E. Metzger
  1283

Lunar Zircon and the Closure Age of the Lunar Crust
C. Meyer, W. Compston, I. S. William
  1284

Shock Metamorphism Peculiarities in Unhomogenous Basaltic Targets
Yu. V. Mironov
  1285

Lunar Impact and Igneous Events Indicated by Composition of Ba-K Phase: a New Indicator of the Lunar Formation
Y. Miura
  1286

K-Rich Phase in NIHO-3(MIYANO) h3 Chondrite
Y. Miura, G. Shibuya
  1287

Cooling Histories of Chondrules in Ordinary Chondrites as Inferred from Chemical Zoning of Olivines
M. Miyamoto, D. S. McKay, G. A. McKay, M. B. Duke
  1288

Thermal History of Ureilite as Inferred from Mineralogy of Pecora Escarpment 82506
M. Miyamoto, H. Toyoda, H. Takeda
  1289

Auger Spectroscopy of Stratospheric Particles: the Influence of Aerosols on Interplanetary Dust
D. W. Mogk, I. D. R. MacKinnon, F. J. M. Rietmeijer
  1290

Local Dust Storm of Sol 1742, Mars
H. J. Moore
  1291

The Origin of the Phlegra Montes, Mars
J. M. Moore
  1292

Topographic Evidence for Shield Volcanism on Io: Implications for Composition and Lithospheric Thickness
J. M. Moore, A. S. McEwen, E. F. Albin, R. Greeley
  1293

Venus Topography and Gravity Models: Preliminary Results
P. Morgan, R. J. Phillips, L. V. Block, M. T. Reagan
  1294

Magnesiowustite in a Shock-Produced Vein of the Tenham Chondrite
H. Mori, H. Takeda
  1295

Determination of Optical Penetration Depths from Reflectance and Transmittance Measurements on Albite Powders
R. V. Morris
  1296

Components for Chemical Mixing Models of Apollo 16 Impact Melt Splashes (ims's) and Soils
R. V. Morris, T. H. See, F. Horz
  1297

Compositional Domains of Apollo 16 Impact Melt Splashes (ims's)
R. V. Morris, T. H. See, F. Horz
  1298

Influence of the Meteoritic Component on the Composition of Apollo 16 Impact Melt Splashes (ims's)
R. V. Morris, T. H. See, F. Horz
  1299

Alteration in Archean Anorthosite Complexes
D. A. Morrison, L. Haskin, Y.-Zh. Qui, W. C. Phinney, D. MacZuga
  1300

Identification of Lava Flow-Permafrost Interactions on Mars
P. J. Mouginis-Mark
  1301

"martian" Volatiles in Shergottite EETA79001: Possible Significance of Secondary Minerals
D. W. Muenow, J. L. Gooding
  1302

Laser 40AR-39AR Dating of the EH3 Qinzhen Chondrite
N. Muller, E. K. Jessberger
  1303

Chemical Signatures at the Cretaceous-Tertiary Boundary Within a Single Manganese Nodule
A. V. Murali, D. P. Blanchard, B. L. K. Somayajulu, J. C. Laul
  1304

Global Tectonic Mapping of Ganymede: a Preliminary Report
S. L. Murchi, J. W. Head
  1305

Tectonic Features in the JG-4 Quadrangle of Ganymede
S. L. Murchi, J. W. Head
  1306

K, u, and CA Partitioning Between Sulfide and Silicate Liquids: Heating of Planetary Cores
M. T. Murrell, D. S. Burnett
  1307

Nitrogen Isotopic Abundances in Individual Chondrules
S. V. S. Murty, K. Marti
  1308

Multi-Stage Reduction in the Primitive Enstatite Chondrites
H. Nagahara
  1309

REE, Rb-Sr and PB Isotopic Characteristics of "lunar" Meteorite YAMATO-791197
N. Nakamura, D. M. Unruh, M. Tatsumoto
  1310

Hf, zr, and REE Partition Coefficients Between Ilmenite and Liquid
Y. Nakamura, N. Nakamura, H. Fujimaki, M. Tatsumoto, G. A. McKay, J. Wagstaff
  1311

Properties of Dense Fluids in the Outer Planets
W. J. Nellis, N. C. Holmes, A. C. Mitchell, H. B. Radousky, M. Ross, D. A. Young
  1312

On the Question of Cratering Equilibrium Versus Production Populations
G. Neukum
  1313

Did the Earth's Core Grow Through Geological Time?
H. E. Newsom, W. M. White, K. P. Jochum
  1314

Shock Deformation, Shatter Cones, and Pseudotachylite at Vredefort: a Review of Major Unsolved Problems and Current Efforts to Resolve Them
L. O. Nicolaysen, W. U. Reimold
  1315

Cosmogenic Nuclides in 15011 Rocklets
K. Nishiizumi, J. R. Arnold, J. Klein, R. Middleton, J. N. Goswami
  1316

Low Temperature Alteration of Amorphous Silicates
J. A. Nuth, B. Donn, R. Deseif, A. Donn
  1317

Infrared Spectra of Mg-Sio Smokes: Comparison with Analytical Electron Microscopy Studies
J. A. Nuth, F. J. M. Rietmeijer, I. D. R. MacKinnon, S. A. Sanford
  1318

Cosmogenic he and NE in Chondrites: Monitors of Spatial Gradients in the Cosmic Ray Flux?
L. E. Nyquist, A. F. McDowell
  1319

Tektite Research: what is Needed
J. A. O'Keefe
  1320

Sampling of Planetary Surfaces by Oblique Impact Jet Entrainment
J. D. O'Keefe, T. J. Ahrens
  1321

A Search for Evidence of Large Body Earth Impacts Associated with Biological Crisis Zones in the Fossil Record
C. J. Orth, J. S. Gilmore, J. D. Knight
  1322

First Results of a Multidisciplinary Analysis of the Haughton Impact Crater, Devon Island, Canada. III. Petrography and Shock Metamorphism
R. Ostertag, P. B. Robertson, D. Stoffler, C. Wohrmeyer
  1323

Lunar Meteorite Yamato 791197: a Weakly Shocked Regolith Breccia from the Far Side of the Moon
R. Ostertag, D. Stoffler, H. Palme, B. Spettel, G. Weckwerth, H. Wanke
  1324

Convex-Profile Inversion of Asteroid Lightcurves: Sensitivity to Viewing/illumination Geometry
S. J. Ostro, M. D. Dorogi, R. Connelly
  1325

Trapped Noble Gases in 5 More Ureilites and the Possible Role of Q
U. Ott, H. P. Lohr, F. Begemann
  1326

Solar Cosmic Ray Produced Spallation Neon in Etched Kapoeta Pyroxenes
J. T. Padia, M. N. Rao, T. R. Venkatesan
  1327

Telescope in Lunar Orbit
T. Page
  1328

An Unusual Chondritic Fragment from the Allende Meteorite
H. Palme, G. Kurat, F. Brandstatter, A. Burghele, J. Huth, B. Spettel, F. Wlotzka
  1329

A Non-Chondritic ca, Al-Ratio for the Upper Mantle of the Earth?
H. Palme, K. G. Nickel
  1330

The Unusual Photometric Properties of Some Outer Satellites Evidence for Geologic Activity
K. D. Pang, J. Lunine, J. W. Rhoads
  1331

A Vanadium-Rich Fluffy Type a Ca-Al Inclusion in Allende
J. M. Paque
  1332

Peculiarities of Composition of Shock Melts in Craters with Two-Layer Target
O. V. Parfenova, L. I. Glazovskaya, Ye. I. Gromov, G. I. Ilkevich
  1333

Convective Cooling of Large Impact Basins
E. M. Parmentier, R. A. F. Grieve, M. J. Cintala
  1334

On the Genesis of Enstatite Meteorite Minerals
M. I. Petaev, A. K. Lavrukhina, I. L. Khodakovsky
  1335

Tharsis is (nearly) Isostatic
R. J. Phillips, N. H. Sleep
  1336

Spectral Characteristics of Experimental Regoliths
C. M. Pieters, F. Horz
  1337

More Evidence for the 2.0(0.5)D Mean Spacing of Basin Rings
R. J. Pike, P. D. Spudis
  1338

Geology of RHEA
J. B. Plescia
  1339

Origin of Planetary Wrinkle Ridges from Terrestrial Analogs
J. B. Plescia, M. Golombek
  1340

First Results of a Multidisciplinary Analysis of the Haughton Dome Impact Structure, Devon Island, Canada.IV. Geophysics
J. Pohl, A. Eckstaller, P. B. Robertson, Z. Hajnal
  1341

Spall Velocity Measurements of Laboratory Scale Impact Craters
C. A. Polanskey, T. J. Ahrens
  1342

Sulfur Dioxide and Martian Surface Temperature
S. Postawko, W. R. Kuhn
  1343

Eu-Sm and Other Refractory Trace Element Systematics for Komatiitic Volcanics and Related Rock Types: Implications for Planetary Bulk Compositions
M. N. Prasad, J. H. Crocket
  1344

Chondrules of the Renazzo and AL Rais Carbonaceous Chondrites: Layering and Accretionary Growth as Part of the Chondrule-Forming Process
M. Prinz, M. K. Weisberg, C. E. Nehru, J. S. Delaney
  1345

A Spectacular Nitrogen Isotopic Anomaly in Bencubbin
C. A. Prombo, R. N. Clayton
  1346

Search for Neutron Effects in the Elephant Moraine Shergottite
R. S. Rajan, G. W. Lugmair
  1347

Origin of Silicate Inclusions in Iron Meteorites
A. S. P. Rao
  1348

Extraterrestrial Components in Greenland Firn Cores Resulting from Major Accretionary Events: the "tunguska Event"
K. L. Rasmussen, G. W. Kallemeyn
  1349

Impact Bombs in Middle Ordovician Marine Sediments of Southeastern Wisconsin
W. F. Read
  1350

Adsorption of HG on Lunar Samples
G. W. Reed, S. Jovanovic
  1351

Pseudotachylite from the Vredefort Dome
W. U. Reimold, M. Andreoli, R. Hart
  1352

Shock and Thermal Metamorphism in Two Lithologies from the Belle Plaine l6 Chondrite
W. U. Reimold, J. Huth, H. Merkle, G. Willner
  1353

Quench Cooling and Convective Fractionation in the Early Lunar Environment
A. Rice
  1354

Low-Temperature Aqueous and Hydrothermal Activity in a Proto-Planetary Body: Goethite, Opal-Ct Gibbsite and Anatase in Chondritic Porous Aggregate W7029*A
F. J. M. Rietmeijer
  1355

On the Continuum Between Chondritic Interplanetary Dust and CI and CM Carbonaceous Chondrites: a Petrological Approach
F. J. M. Rietmeijer
  1356

A Multi-Stage History for Carbonaceous Material in Extraterrestrial Chondritic Porous Aggregate W7029*A and a New Cosmothermometer
F. J. M. Rietmeijer, I. D. R. MacKinnon
  1357

First Results of a Multidisciplinary Analysis of the Haughton Impact Crater, Devon Island, Canada. I. Geology
P. B. Robertson, R. Ostertag, L. Bischoff, W. Oskierski, L. J. Hickey, M. R. Dawson
  1358

Surface Films on Ultrafine Regolith Particles: Composition and Origin
O. D. Rode, M. A. Nazarov, V. S. Fainberg, G. I. Ramendik
  1359

A Morphological Catalogue of Lunar Craters
Zh. F. Rodionova, T. P. Skobeleva, A. A. Karlov
  1360

Tidal Dissipation in a Viscoelastic Planet
M. N. Ross, G. Schubert
  1361

Quantitative Analysis of Martian Polygonal Ground
L. A. Rossbacher
  1362

Mars: Seasonally Variable Radar Reflectivity
L. E. Roth, R. S. Saunders, G. Schubert
  1363

The Effects of Temperature on the Spectral Reflectance of Asteroid Surfaces: a Model
T. L. Roush, R. B. Singer
  1364

Compositional Differences Between Ordinary and Carbonaceous Chondrite Chondrules
A. E. Rubin, J. T. Wasson
  1365

Lunar Palaeomagnetic Directions and the Existence of Satellites around Satellites
S. K. Runcorn
  1366

Premature Particles in the Solar Nebula
T. V. Ruzmaikina, V. S. Safronov
  1367

Materials in the Apennine Front, Apollo 15
G. Ryder, P. D. Spudis
  1368

Metasomatic or Deuteric Alteration in Stillwater Anorthosites
P. A. Salpas, L. A. Haskin
  1369

Petrogenesis of Lunar Granites: the Result of Apatite Fractionation
P. A. Salpas, J. W. Shervais, S. A. Knapp, L. A. Taylor
  1370

Basalt Clasts in Breccia 72275: Examples of Pre-Mare Volcanism
P. A. Salpas, L. A. Taylor
  1371

Filamentary Sublimation Residues from Dispersions of Siliceous Particles in Ice
R. S. Saunders, T. J. Parker, J. B. Stephens, E. G. Laue, F. P. Fanale
  1372

Physical Controls on Sir-A Signal Penetration and Subsurface Scattering in the Mars-Like Eastern Sahara
G. G. Schaber, C. S. Breed, J. F. McCauley, G. H. Billingsley
  1373

Callisto is not BORING!
P. M. Schenk, W. B. McKinnon
  1374

Analysis of Micrometeorite Material Captured by the Solar Max Satellite
L. S. Schramm, D. S. McKay, H. A. Zook, G. A. Robinson
  1375

A Geochemical Electromotive Force Series
H. D. Schreiber
  1376

Impact-Induced Vaporization: Effect of Impact Angle and Atmospheric Pressure
P. H. Schultz, D. E. Gault
  1377

The Effect of Projectile Shape on Cratering Efficiency and Crater Profile in Granular Targets
P. H. Schultz, D. E. Gault
  1378

Ice-Embedded Unconformable Deposits as a Possible Source for Run-Off Channels
P. H. Schultz, J. Simon, S. M. Clifford
  1379

Procellarum Basin: a Major Impact or the Effect of Imbrium?
P. H. Schultz, P. D. Spudis
  1380

Further Petrologic Studies of Metamorphosed Carbonaceous Chondrites
E. R. D. Scott
  1381

Properties and Genesis of Two Anomalous Type 3 Chondrites, Suwahib (buwah) and Willaroy
E. R. D. Scott, R. N. Clayton, T. K. Mayeda
  1382

Nature and Evolution of Unmetamorphosed Parent Material of Types 4-6 Ordinary Chondrites
E. R. D. Scott, G. J. Taylor, K. Keil
  1383

Compositional Homogeneity/heterogeneity of Apollo 16 Impact Melt Splashes: how Many Impacts?
T. H. See, F. Horz
  1384

Apollo 16 Impact Melt Splashes: Implications from the Host Rocks
T. H. See, F. Horz, R. V. Morris
  1385

Iridium Discovery at the Jeptha Knob Cryptoexplosion Structure, Kentucky
C. R. Seeger, F. Asaro, H. Michel, W. Alvarez, L. Alvarez
  1386

Outlier Detached Plateaus and the Highland Boundary on Mars
A. M. Semeniuk, H. Frey
  1387

Oxidation of Platinum Anodes in Silicate Melt Electrolysis
K. W. Semkow, L. A. Haskin
  1388

The Diffusive and Structural Behavior of Nickel Ion in Melt Diopside-Anorthite Composition
K. W. Semkow, L. A. Haskin
  1389

Global Topographic and Structural Fabric on Venus
V. L. Sharpton, J. W. Head
  1390

Petrology and Geochemistry of Microbreccia Clasts and Matrix in Lunar Breccia 14321
J. W. Shervais, S. A. Knapp, L. A. Taylor, M. M. Lindstrom
  1391

Petrology and Mineral Chemistry of Some African Eclogites and the Evolution of Sub-Continental Mantle and Continental Crust
J. W. Shervais, L. A. Taylor, R. L. Korotev
  1392

Olivine - Non-Pristine High-Mg Component in Lunar Breccia 14321
J. W. Shervais, L. A. Taylor, M. M. Lindstrom
  1393

The Surfaces of Venus, Mars, Mercury, and the Moon: Some Regularities
V. V. Shevchenko, Zh. F. Rodionova, K. I. Dekhtyareva, T. P. Skobeleva
  1394

On the Problem of Origin of Multiring Basins
V. V. Shevchenko, A. N. Sanovich, G. A. Lejkin
  1395

An Optical Study of Carbonaceous Chondrites and Basalt Achondrites
Yu. G. Shkuratov, L. A. Akimov, A. Ya. Vokhmentzev, I. I. Antipova-Karatayeva
  1396

Mangala Valles Outflow Region: Characterization of the Source and Associated Terrains
J. F. Simon, P. H. Schultz
  1397

Petrology of the Apollo 12 Highland Component
S. B. Simon, J. J. Papike
  1398

Petrology of Apollo 12 Regolith Breccias
S. B. Simon, J. J. Papike, D. C. Gosselin
  1399

Agglutinate Melting Mechanisms i: Experimentally Shocked Feldspars
S. B. Simon, J. J. Papike, F. Horz, T. H. See
  1400

Observed Upper Limits for Clay Minerals on Mars
R. B. Singer, P. D. Owensby, R. N. Clark
  1401

Induced and Stimulated Configuration of Venus Magnetic Field
R. N. Singh, R. Prasad
  1402

Heating Efficiency of Venus Atmosphere
R. N. Singh, H. O. Upadhyay
  1403

Venus Gravity: Niobe-Aphrodite
W. L. Sjogren, R. N. Wimberly, R. S. Saunders, W. B. Banerdt
  1404

Impact Experiments in Cold Rock Targets. I Cratering
S. Smrekar, M. J. Cintala, F. Horz
  1405

Impact Experiments in Cold Rock. II: Collisional Fragmentation
S. Smrekar, M. J. Cintala, F. Horz, F. Cardenas, T. D. Thompson
  1406

Strain Analysis of the Parnallee Unequilibrated Ordinary Chondrite
D. S. Sneyd, H. Y. McSween, T. C. Labotka
  1407

The Elastic Lithosphere: Some Relationships among Flexure, Depth of Faulting, Lithospheric Thickness, and Thermal Gradient
S. C. Solomon
  1408

Determination of the Volatile Components of Fluid Inclusions in Archean Rocks Using Micro-Crushing and Thermal Decrepitation Coupled with a Capacitance Manometer and Mass Spectrometer
M. A. Sommer, E. K. Gibson
  1409

Trapped Volatiles in Archean Rocks
M. A. Sommer, E. K. Gibson, W. Bourcier
  1410

39AR-40AR Ages of ALHA 77302, 77256 and 77219
R. R. Spangler, R. L. Warasila
  1411

How much Anorthosite in the Lunar Crust?: Implications for Lunar Crustal Origin
P. D. Spudis, P. A. Davis
  1412

The Proposed Lunar Procellarum Basin: Some Geochemical Inconsistences
P. D. Spudis, P. H. Schultz
  1413

Temperatures Within Comet Nuclei
S. W. Squyres, C. P. McKay, R. T. Reynolds
  1414

Newly Discovered Martian Impact Basins
M. Stam
  1415

Unique Forsterite in Chondrites. I Luminescence and Textural Features
I. M. Steele, C. M. Skirius, J. V. Smith
  1416

Unique Forsterite in Chondrites. II: Compositional Variation and High Minor Element Content
I. M. Steele, J. V. Smith, C. M. Skirius
  1417

Implications of Very Large Impacts for Earth Accretion and Lunar Formation
D. J. Stevenson
  1418

Partitioning of Noble Gases at Extreme Pressures Within Planets
D. J. Stevenson
  1419

Southern Ishtar Terra and Guinevere/sedna Planitia: New Observations from Earth-Based Radar
E. R. Stofan, D. B. Campbell, J. W. Head, A. A. Hine
  1420

Multiple Ring Features in THEMIS Regio: Evidence for Endogenic Origin
E. R. Stofan, J. W. Head, D. B. Campbell
  1421

Thermometry of Ca-Al Inclusions
E. Stolper, G. J. MacPherson, J. R. Beckett, L. Grossman
  1422

Magnetic Fractionation in the Early Solar System
D. W. Strangway, N. Sugiura
  1423

On the Natural Remanent Magnetization in Allende Meteorite
N. Sugiura, T. Matsui, D. W. Strangway
  1424

Excess Fission Xenon and I-Pu Dating
T. D. Swindle, M. W. Caffee, C. M. Hohenberg
  1425

Origin of Hree-Depleted Archean Dacites: a Case Study from the Wawa (michipicoten) Greenstone Belt, Ontario
P. J. Sylvester, K. Attoh, K. J. Schulz
  1426

Crystal Fractionation of the HED (howardite, Eucrite, Diogenite) Achondrite Parent Body as Inferred from Yamato 791073
H. Takeda
  1427

Mineralogical Studies of Lunar Meteorites and the Lunar Analogs
H. Takeda, H. Mori, M. Miyamoto, T. Ishii
  1428

Cloudy Pigeonite in Yamato 790981 with Reference to the Origin of Chemical Trends of Ureilites
H. Takeda, H. Mori, O. Tachikawa
  1429

Crater-Density Stratigraphy of the Western Martian Highlands
K. L. Tanaka
  1430

New Stratigraphic Developments for Mars
K. L. Tanaka
  1431

Positive Cerium Anomaly of Lunar 14310: Examination by 138CE/142CE
T. Tanaka, H. Shimizu, K. Shibata, A. Masuda
  1432

Titanium and VLT Basalts of Luna 16 and Luna 24: Geochemical Comparison
L. S. Tarasov, A. F. Kudryashova, G. M. Kolesov, A. Mashtalka, J. Frana
  1433

Xfa-Sr for the Analysis of Elements of Lunar Rocks and Meteorites
L. S. Tarasov, A. F. Kudryashova, A. A. Ulyanov, V. B. Baryshev, G. N. Kulipanov, A. N. Skrynsky
  1434

Geochemical Constraints on Theories of Lunar Origin
S. R. Taylor
  1435

Textures, Metamorphism, and Origin of Type a Cai's
J. Teshima, G. J. Wasserburg
  1436

Dust Devils on Mars
P. Thomas, P. Gierasch
  1437

Crater Relaxation as a Probe of Europa's Interior
P. J. Thomas, G. Schubert
  1438

Landform Identification in Lunar Radar Images
T. W. Thompson, H. J. Moore
  1439

- Carbonate-Rich Hydrated Interplanetary Dust Particle: Possible Residual Material from Protostellar Clouds
K. Tomeoka, P. R. Buseck
  1440

Microtextures of Pcp: Footmarks of Aqueous Alteration Involving CM Carbonaceous Chondrites
K. Tomeoka, P. R. Buseck
  1441

The Nakhla Meteorite: Evidence for Origin in an Ultrabasic Lava Flow
A. H. Treiman
  1442

Siderophile and Chalcophile Elements in the Shergottite Parent Body (spb) and Earth
A. H. Treiman, M. J. Drake, J. Hertogen, M.-J. Janssens, R. Wolf, M. Ebihara
  1443

Cometary Chemical Analysis by Passive in Situ Gamma-Ray Spectroscopy in a Penetrator
J. I. Trombka, L. G. Evans
  1444

Fractals, Fragmentation, and a Renormalization Group Determination of the Frequency-Mass Distribution of Meteorites and Asteroids
D. L. Turcotte
  1445

Partial Pressure of CO2 and Impact-Induced Devolatilization of Carbonates: Implications for Planetary Accretion
J. A. Tyburczy, T. J. Ahrens
  1446

Isotopic Composition of Oxygen in the Efremovka Cai's
A. A. Ulyanov, V. I. Ustinov, E. Ya. Gavrilov, Yu. A. Shukolyyukov
  1447

An Improved Model of Gas Cloud Acceleration of Entrained Ejecta
A. M. Vickery
  1448

Size-Velocity Distribution of Ejecta Fragments on Three Planetary Bodies
A. M. Vickery, J. M. McConnell
  1449

New CCD Reflectance Spectra of Mercury
F. Vilas
  1450

Solar Wind and Noble Gases in Atmospheres of Mars and Earth
A. V. Vitjazev
  1451

On the Evaporation Interstellar Dust during the Pre-Planetary Disk Formation
A. V. Vitjazev, G. V. Pechernikova
  1452

Combined Chemical/petrological Classification of Ca-Al Inclusions
D. A. Wark
  1453

Observational Constraints on Solar Nebula Models
D. A. Wark
  1454

Genesis of the Geochemical Bimodality of Pristine Nonmare Rocks
P. H. Warren
  1455

"new" Pristine Moon Rocks: Augite-Rich Ferroan Anorthosite 76504,18--LINK Between Ferroan Anorthosites and Mare Basalt Source Regions?
P. H. Warren, G. W. Kallemeyn
  1456

Formation of Mesosiderites as a Natural Consequence of Planetary Formation
J. T. Wasson, A. E. Rubin
  1457

Fold Model for Ridges of the Tharsis Region of Mars
T. R. Watters, T. A. Maxwell
  1458

Carbon Isotopic Compositions of Individual Hydrocarbons, Carbon Dioxide, and Oils from the Fischer-Tropsch Reaction
K. Wedeking, R. Shipp, S. Chang, E. Rightor, T. J. Pinnavaia
  1459

Giant Impacts and the Formation of the Moon
G. W. Wetherill
  1460

He, ne, and AR in Antarctic Meteorites: Solar Noble Gases in an Enstatite Chondrite
R. Wieler, H. Baur, Th. Graf, P. Signer
  1461

Lunar Impact Rates Reconsidered
D. E. Wilhelms
  1462

On the Reorientation of the Moon by Masses at the Lunar Surface
R. J. Willemann, C. Dawson
  1463

Aeolian Activity on Venus: the Effect of Atmospheric Density on Saltation Flux
S. H. Williams, R. Greeley
  1464

Three Lithologic Units of 72275
K. J. Willis
  1465

Photoclinometry of Terrestrial and Planetary Surfaces
L. Wilson, J. S. Hampton, H. C. Balen
  1466

Venus Volcanism: Theory and Predictions of Volcanic Deposits and Landforms
L. Wilson, J. W. Head
  1467

Lunar Sinuous Rilles: Quantitative Estimation of Eruption Conditions
L. Wilson, D. Illing, J. W. Head
  1468

Olivine-Spinel and Olivine-Ilmenite Thermometry in Chondrites of Different Petrologic Type
F. Wlotzka
  1469

The Initiation of Chondrite Accretion after Chondrule Formation by Drag Heating
J. A. Wood
  1470

Rationale for Using the Gravity Field to Define the Topography Datum of Mars
S. S. C. Wu
  1471

Melt Evaporation Under Fast Heating Conditions
O. I. Yakovlev, V. S. Fainberg, A. I. Shapkin, G. I. Ramendik
  1472

Selective Condensation of Basaltic Vapor
O. I. Yakovlev, V. S. Fainberg, A. I. Shapkin, G. I. Ramendik
  1473

The Compositional Evolution of Meteorites Produced by the Vaporization of Iron
O. I. Yakovlev, O. M. Markova, A. N. Belov, G. A. Semenov
  1474

SOLIS Lacus Brines: Possible Chemistry and Kinetics
A. P. Zent, F. P. Fanale
  1475

Estimates of Rheologic Properties for Six Martian Lava Flows
J. R. Zimbelman
  1476

Surface Properties of Ascraeus Mons: Dust Deposits on a Tharsis Volcano
J. R. Zimbelman
  1477

Surface Morphology on the Martian Volcano Ascraeus Mons
J. R. Zimbelman, R. McAllister
  1478

Accurate Stratospheric Particle Size Distributions from Two Separate Flat-Plate Collection Surfaces: can we See Variations with Time?
M. E. Zolensky, I. D. R. MacKinnon, G. A. Robinson, D. S. McKay
  1479

A Probable Occurrence of Well Preserved Meteorite Ablation Material from the Upper Jurassic of Poland
M. E. Zolensky, A. V. Murali, W. Brochwicz-Lewinski
  1480

Sulfur-Containing Gases in the Venus Atmosphere and Stability of Carbonates
M. Yu. Zolotov
  1481

Composition of Volcanic Gases on Venus
M. Yu. Zolotov, I. L. Khodakovsky
  1482

On Dust Particles in the Jovian System
H. A. Zook, S.-Y. Su, D. H. Humes
  1483

Ductile Lithosphere Extension: Implications for Rifting on the Earth and Venus
M. T. Zuber, E. M. Parmentier, J. W. Head
  1484