Lunar and Planetary Institute






Fourteenth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

Consortium 67915: Ages and Composition of Troctolitic Anorthosites and Sodic Ferrogabbro Clasts
U. Aeschlimann, P. Eberhardt, J. Geiss, N. Groegler, D. Jost, M. S. Ma, K. Marti, R. Schmitt, J. Taylor
  1001

The Permian-Triassic Boundary Event: Geochemical Investigation of the Transcaucasia Section
A. S. Alekseev, L. D. Barsukova, G. M. Kolesov, M. Nazarov, A. G. Grigoryan
  1002

Chemistry of the Primitive Mantle
D. L. Anderson
  1003

On the Concentration of Minor Components in the Nearsurface Venus' Atmosphere: Physico-Chemical Implication
N. E. Andreeva, V. P. Volkov, Yu. I. Sidorov, I. L. Khodakovsky
  1004

A Model of Magmatic Differentiation and Possibility of its Application to Petrogenesis of Lunar Highland Rocks
A. A. Ariskin, M. Ya. Frenkel, A. A. Yaroshevsky
  1005

MG Isotopic Systematics in the Allende Inclusion Wa: Panurge Takes a Second Look
J. T. Armstrong, G. J. Wasserburg
  1006

Cratering Motions and Material Descriptions for Prairie Flat/dial Pack Surface-Burst Explosion Craters in Wet, Unconsolidated Alluvium
M. G. Austin
  1007

Auras and io Regolith Outgassing by Sulphur Flows
S. M. Baloga, D. L. Matson, D. C. Pieri
  1008

Palagonites VS. Smectites as Possible Mars Soil Analogs
A. Banin, L. Margulies
  1009

The Mineral Composition of Rocks at the Landing Sites of Venera 13 and Venera 14 Descending Modules: Thermodynamic Calculations
V. L. Barsukov, I. L. Khodakovsky, V. P. Volkov, Yu. I. Sidorov, M. V. Borisov
  1010

Petrography, Morphology and Distribution of Sizes of the Chondrules from the Kainsaz Carbonaceous Chondrite (C30)
G. V. Baryshnikova, Yu. I. Stakheev, G. G. Rukhman, A. K. Lavrukhina
  1011

Correlation of Venus Surface Roughness with the Terrain Altitude and General Slopes: New Approach to Analysis of Pioneer-Venus and Earth-Based Radar Data
A. T. Basilevsky, V. P. Kryuchkov, Yu. G. Shkuratov, Yu. V. Korniyenko, D. G. Stankevich
  1012

Size-Composition Relationships in Green and Orange Lunar Glasses
A. Basu
  1013

Preliminary Modal Petrology of Apollo 16 Double Drive Tube Core 64001
A. Basu, D. S. McKay, G. Nace
  1014

Recent Comet Impacts on the Moon?
J. F. Bell, B. R. Hawke
  1015

Xe on Shales: the "plastic Bag" Experiment
T. J. Bernatowicz, F. A. Podosek, M. Honda, F. E. Kramer
  1016

15445 and 15455: Origin and Preliminary Age Data
M. L. Bernstein
  1017

Observations of Craters with Domed Central Pit on Ganymede
R. Bianchi, S. Pozio
  1018

The "C.O.M.E.T." Experiment (collecte EN Orbite de Matier Extraterrestre)
J.-P. Bibring, J. Borg, Y. Langevin, F. Rocard, B. Vassent
  1019

A Critical Review of the Evidence Concerning the Depth of the Mare Basalt Magma Source Region
A. B. Binder
  1020

Lunar Stress History, Part 1: Global Thermoelastic, Tidal, and Synchronous Rotational Stresses
A. B. Binder
  1021

Evidence for an Initially Totally Molten Moon: Young Thrust Fault Scarps in the Highlands
A. B. Binder, H.-C. Gunga
  1022

Evidence for an Initially Totally Molten Moon: Shallow Moonquakes with Kilobar Stress Drops
A. B. Binder, J. Oberst
  1023

Ca-Al Chondrules and Inclusions in Ordinary Chondrites Evidence for a Related Genesis of Ordinary and Carbonaceous Chondrites
A. Bischoff, K. Keil
  1024

Clast Population Statistics of Fragmental Breccias, North Ray Crater, Apollo 16: Implications for the Descartes Formation
A. Bischoff, D. Stoffler, R. Borchardt, A. Rehfeldt
  1025

Trace Element Zoning in Coexisting Chromite/ulvospinel in Apollo 12 Samples - Analyzed by a Proton Beam Microanalyzer
H. Blank, A. El Goresy, J. Janicke, R. Nobiling, K. Traxel
  1026

Martian Atmospheric Gases Trapped in the EETA79001 Shergottite?
D. D. Bogard, P. Johnson
  1027

Trapped Solar Gases in the ALHA81005 LUNAR(?) Meteorite
D. D. Bogard, P. Johnson
  1028

The Role of Crystalline Defects in the Distribution of Metallic Particles in Olivine: Meteoritic Implications
J. N. Boland, A. Duba
  1029

Are the Descartes and Cayley Formations at Apollo 16 Characterized by Different Impact Melt Lithologies?
R. Borchardt, D. Stoffler, A. Bischoff, W. U. Reimold
  1030

Sputter-Induced Atmosphere and Molecular Ejection on IO
J. W. Boring, J. W. Garrett, E. Sieveka, R. E. Johnson, W. L. Brown, L. J. Lanzerotti
  1031

Shock-Melting and Vaporization of Anorthosite and Implications for an Impact-Origin of the Moon
M. B. Boslough, T. J. Ahrens
  1032

On the Formation of the Presolar Nebula from a Multiple Protostellar System
A. P. Boss
  1033

Mineralogy and Crystal Chemistry of CP Micrometeorites
J. P. Bradley, D. E. Brownlee
  1034

Intrinsic Oxygen Fugacity Measurements of 7 Chondrites and a Pallasite, and Redox State of Meteorite Parent Bodies
R. Brett, M. Sato
  1035

Partitioning of cr, mn, V and NI Between fe Melt, Magnesiowuestite and Olivine at High Pressures and Temperatures
G. Brey, H. Wanke
  1036

The Relative Frequency of Small CI Meteoroids
D. E. Brownlee, M. Wheelock, J. P. Bradley
  1037

Allende Dark Inclusions: Samples of Primitive Regoliths
T. E. Bunch, S. Chang
  1038

Ice-Bearing Permafrost on Mars Upper Boundary Depth: Connection with Topography
G. A. Burba, R. O. Kuzmin, V. P. Shashkina
  1039

T-Environmental Changes: Se-Germany
P. J. Burek, J. D. Arneth
  1040

Chemistry of Shergottites and the Shergotty Parent Body (spb): Further Evidence for the Two Component Model of Planet Formation
A. Burghele, G. Dreibus, H. Palme, W. Rammensee, B. Spettel, G. Weckwerth, H. Wanke
  1041

Spectral Chemistry of Green Glass-Bearing 15426 Regolith
R. G. Burns, M. D. Dyar
  1042

Apparent Volcanic Cycles in the Archean Swaziland Supergroup, Barberton Mountain Land, South Africa: a Result of Non-Magma Processes
G. R. Byerly, D. R. Lowe, B. W. Nocita, B. L. Ransom
  1043

Cosmogenic Neon from Pre-Compaction Irradiation of Murchison and Kapoeta
M. W. Caffee, J. N. Goswami, C. M. Hohenberg, T. D. Swindle
  1044

Behavior of the Sun during Growth from the Primitive Solar Nebula
A. G. W. Cameron, J. A. Mercer-Smith
  1045

Fluorine and Chlorine Variations in an Island Arc Basalt Suite
J. A. Canepa, C. B. Moore
  1046

Geology of Galileo Regio, Ganymede
R. Casacchia, R. G. Strom
  1047

Prospects for Future Meteorite Recoveries on the Antarctic Ice Sheet
W. A. Cassidy
  1048

Tidal Effects on Saturn Ring Particles: Implications for Ring Evolution
C. R. Chapman, D. R. Davis, S. J. Weidenschilling, R. Greenberg
  1049

Fe-Pt Alloy Capsules for High Pressure-Experiments
H.-K. Chen, D. J. Andersen, D. H. Lindsley
  1050

Apollo 14 Very Low Titanium Liquids: Behavior of Iron-Rich Liquids at High Pressures and Temperatures
H.-K. Chen, D. H. Lindsley
  1051

The Abundances of AG and CD Isotopes in Iron Meteorites
J. H. Chen, G. J. Wasserburg
  1052

The Least Radiogenic PB in Iron Meteorites
J. H. Chen, G. J. Wasserburg
  1053

Basin Control of Ridge Patterns on Mars
A. Chicarro, P. H. Schultz, P. Masson
  1054

Comparison of Radar and Thermal Properties of Mars
P. R. Christensen
  1055

The Distribution of Rocks on Mars
P. R. Christensen
  1056

Mineralogy and Microstructure of Some C-Type Interplanetary Dust Particles as Determined by Analytical Electron Microscopy
R. Christoffersen, P. R. Buseck
  1057

Galim, an Unusual Enstatite-Chondrite
M. Christophe-Michel-Levy, M. Bourot-Denise
  1058

Lunar Sample Magnetic Stratigraphy
S. M. Cisowski, M. Fuller
  1059

Correspondence of Shergottites and Martian Fines
B. C. Clark
  1060

A Look at the Major Terrains of Mercury Through Radar Profiles
P. E. Clark
  1061

Kinetics of Ice Grain Growth: Implications for Remote Sensing of Planetary Surfaces
R. N. Clark, F. P. Fanale, A. P. Zent
  1062

New "fun" Inclusions from Allende
R. N. Clayton, T. K. Mayeda, I. D. Hutcheon, C. Molini-Velsko, L. Grossman, A. El Goresy
  1063

Oxygen Isotope Groups in Iron Meteorites
R. N. Clayton, T. K. Mayeda, E. J. Olsen, M. Prinz
  1064

Morphometric Analysis and the Origin of Martian Tributary Networks
R. H. Clegg, H. Frey
  1065

Phyllosilicates in Refractory Inclusions in the Mokoia C3(V) Chondrite
R. E. Cohen, A. S. Kornacki
  1066

U-Pb Geochronology of Zircons from Breccia 73217 Using a Sensitive High Mass-Resolution Ion Microprobe (shrimp)
W. Compston, I. S. Williams
  1067

Equilibrium Structure of Satellitary Disks
A. Coradini, G. Magni
  1068

On the Siting of Noble Gases in Silicate Inclusions of the EL Taco Iron Meteorite
J. Crabb
  1069

The Improbability of Viscous Relaxation on Icy Satellites
S. K. Croft
  1070

On the Origin of Palimpsests on Icy Satellites
S. K. Croft, R. Ladbury
  1071

Allan Hills 78084: Atmospheric Ablation and Preatmospheric Size Deduced from Cosmic Ray Tracks
G. Crozaz
  1072

Where does Brachina Come From?
G. Crozaz, P. Pellas
  1073

Chain Periodicity Faults in Pyroxferroite from Lunar Basalt 12021
M. Czank, F. Liebau
  1074

Asteroid Collisions; Effective Body Strength and Efficiency of Catastrophic Disruption
D. R. Davis, C. R. Chapman, R. Greenberg, S. J. Weidenschilling
  1075

Concordant Crater Floor Elevations on the Moon
R. A. de Hon
  1076

The Medanitos Feldspar Cumulate Eucrite
J. S. Delaney, C. E. Nehru, M. Prinz
  1077

The Polymict Eucrites
J. S. Delaney, M. Prinz, H. Takeda
  1078

Indigenous Lunar Volatiles in Mare Volcanic Glasses
J. W. Delano, D. H. Lindsley
  1079

Mare Volcanic Glasses from Apollo 17
J. W. Delano, D. H. Lindsley
  1080

Role of Whitlockite and Apatite in Lunar Felsite
J. E. Dickinson, P. C. Hess
  1081

Polarimetric Analysis of the Mars' Dust Storms and Clouds
A. Dollfus, S. Ebisawa
  1082

Geochemical Constraints on the Origin of the Moon
M. J. Drake
  1083

Meteorite from the Lunar Terrae: Preliminary Petrology of ALHA 81005,9
M. J. Drake
  1084

Experimental Determination of the Partitioning of Gallium Between Metal and Silicate: Electron and Ion Probe Study
M. J. Drake, H. E. Newsom, S. Reed, M. C. Enright
  1085

Breccias in the Footwall of the Sudbury Impact Structure - Terrestrial Equivalents of Lunar Breccias?
B. O. Dressler
  1086

Rheology of Ice ih at High Pressure and Low Temperature
W. B. Durham, H. C. Heard, S. H. Kirby
  1087

Aphrodite Terra, Venus: Characteristics of Geologic Provinces
W. J. Ehmann, J. W. Head
  1088

A Refractory Inclusion from the Essebi (CM2) Carbonaceous Chondrite
A. El Goresy, H. Palme, H. Yabuki, K. Nagel, P. Ramdohr
  1089

On the Production of Cosmogenic Nuclides by High-Energy Secondary Particles: Simulation Experiments with Beam Stop Neutrons
P. Englert, S. Theis, R. C. Reedy, J. R. Arnold
  1090

Dating of Early Regolith Exposure and the Evolution of Trapped 40AR/36AR with Time
O. Eugster, J. Geiss, N. Grogler
  1091

ALUMINUM-26 Content of ALHA 81005
J. C. Evans, J. H. Reeves
  1092

Cosmogenic Radionuclides in the WETHERSFIELD-1982 and Tuxtuac Chondrites
J. C. Evans, J. H. Reeves
  1093

No Unusual Compositions of the Stable Isotopes of Nitrogen, Carbon and Hydrogen in SNC Meteorites
A. E. Fallick, R. W. Hinton, D. P. Mattey, S. J. Norris, C. T. Pillinger, P. K. Swart, I. P. Wright
  1094

Concerning the Size Distribution of Ultrafine Iron in Lunar Soil
A. E. Fallick, C. T. Pillinger, A. Stephenson, R. M. Housley
  1095

The Geochemical Behavior of Refractory Noble Metals and Lithophile Trace Elements in Cai's
B. Fegley, A. S. Kornacki
  1096

Chemical Probes of Saturn's Deep Atmosphere
B. Fegley, R. G. Prinn
  1097

Circular Structure Logancha as Possible Meteorite Crater in Basalts of the Tunguska Syneclise
V. I. Feldman, L. V. Sazonova, Yu. V. Mironov, I. G. Kapustkina, B. A. Ivanov
  1098

Experimental Impacts Into Viscous Fluids: Implications for Oscillating Peak Models of Crater Formation
J. H. Fink, R. Greeley
  1099

CARBON-14 Ages of Antarctic Meteorites
E. L. Fireman
  1100

Characterization of Unique Norite/gabbro Clasts in Breccia 67975
M. K. Flohr, O. B. James
  1101

Glasses from Consortium Breccias 64435, 61015 and 67975
M. K. Flohr, O. B. James
  1102

Lithification and Disintegration on the Surface of Venus
C. P. Florensky, A. T. Basilevsky, V. P. Kryuchkov, R. O. Kusmin, O. V. Nikolaeva, A. A. Pronin, I. M. Chernaya, Yu. S. Tyuflin, A. S. Selivanov, M. K. Naraeva, L. B. Ronca
  1103

Redox Indicator "contrast" on the Surface of Venus
C. P. Florensky, O. V. Nikolaeva, V. P. Volkov, A. F. Kudryashova, A. A. Pronin, Yu. M. Gektin, E. A. Tchaikina, A. S. Bashkirova
  1104

Rapid Erosion of Plastics in Near-Earth Orbit and a Means of Prevention
P. Fraundorf, D. Lindstrom, N. Pailer, P. Swan, R. Walker, E. Zinner
  1105

Laboratory Infrared Spectroscopic Measurements of Interplanetary Dust Particles and Comparison with Astronomical Observations of Comet Dust
P. Fraundorf, R. I. Patel, S. A. Sandford, R. M. Walker
  1106

Micro-Irghizites from a Sediment Samples from the Zhmanshin Impact Structure
K. Fredriksson, B. P. Glass
  1107

Bushveld Igneous Complex, South Africa: Absence of Shock-Metamorphic Effects after an Extensive Search
B. M. French
  1108

The Phase Convection in Relation to Mechanism of the Highland Lunar Rocks Formation
M. Ya. Frenkel
  1109

Small Cones in Cydonia: Distribution and Properties Related to Background Terrain
H. Frey, A. M. Semeniuk, M. Jarosewich
  1110

Carbon, Nitrogen and Xenon Components in the Allende Carbonaceous Chondrite
U. Frick, R. H. Becker, R. O. Pepin, D. J. Desmarais
  1111

Possible Effects of Thermal Stress on the Lithification of Chondrite Parent Bodies
N. Fujii, Y. Hamano, M. Miyamoto
  1112

Effects of Low Melting-Temperature Components on the Lithification of Planetesimals and Meteorites
N. Fujii, M. Miyamoto, K. Ito, Y. Kobayashi
  1113

Anisotropic Shape of Fe-Ni Grains in Ordinary Chondrites
N. Fujii, M. Miyamoto, Y. Kobayashi, K. Ito
  1114

Lu-Hf Systematics of the Lunar and Terrestrial Basalts
H. Fujimaki, M. Tatsumoto, D. M. Unruh
  1115

The Chemistry of the Ordinary Chondrites
C. R. Fulton, J. M. Rhodes
  1116

The Origin of the Ordinary Chondrites: Implications from Refractory and Siderophile Element Abundances
C. R. Fulton, J. M. Rhodes
  1117

The Asteroid (4) Vesta: Rotational Spectral Variations, Surface Material Heterogeneity, and Implications for the Origin of the Basaltic Achondrites
M. J. Gaffey
  1118

Explosion Craters in Ice at Large Scaled Yields
E. S. Gaffney, H. K. Brown, J. A. Cheney
  1119

Radar Roughness at Venus Landing Sites
J. B. Garvin, J. W. Head
  1120

Size Frequency Analysis of Fragments in Venera 13 and 14 Panoramas of Venus
J. B. Garvin, J. W. Head, A. T. Basilevsky
  1121

Venus Global Radar Roughness: a Preliminary Analysis
J. B. Garvin, J. W. Head, S. Zisk, G. Pettengill
  1122

Transformation of Venera 13 and 14 Panoramas Into Viking Lander Perspective
J. B. Garvin, P. Helfenstein, M. T. Zuber
  1123

The Terrestrial Accretion of Lunar Material
D. E. Gault
  1124

Water-Soluble Ion Behavior in Cold Desert Environments
E. K. Gibson, S. A. Hokanson, S. J. Wentworth, R. Bustin
  1125

Sulfur in Achondritic Meteorites
E. K. Gibson, C. B. Moore
  1126

Fault Type Predictions from Stress Distributions on Planetary Surfaces: Importance of Fault Initiation Depth
M. P. Golombek
  1127

Origin of Triple Bands on Europa
M. Golombek, E. Bruckenthal
  1128

Tharsis Fault Sequence as a Test of a Deformation Mechanism
M. P. Golombek, R. J. Phillips
  1129

Spectral Reflectance of Unquenched Sulfur
J. Gradie, J. Moses
  1130

Preliminary Investigation of Ti-Site Geometry in Lunar Volcanic and Impact Glasses by X-Ray Absorption Spectroscopy
R. B. Greegor, F. W. Lytle, R. C. Ewing, K. Keil
  1131

Radar Signatures of Wind Streaks: Preliminary Sir-A Analysis
R. Greeley, Y. Asmerom, S. Barnett
  1132

Venus: Preliminary Wind Tunnel Simulations of Aeolian Processes
R. Greeley, S. H. Williams, J. R. Marshall, B. R. White, J. D. Iversen, R. N. Leach, J. B. Pollack
  1133

The Origin of Comets: Icy Residue of Planet Growth
R. Greenberg, S. J. Weidenschilling, C. R. Chapman, D. R. Davis, W. K. Hartmann
  1134

The Impact Cratering Rate in Recent Time: a Reappraisal
R. A. F. Grieve
  1135

Collisional Balance of the Meteoritic Complex
E. Grun, H. A. Zook, H. Fechtig
  1136

Three Mars Years of Surface Contrast Changes Seen at the Mutch Memorial Station (viking Lander 1)
E. A. Guinness, R. E. Arvidson
  1137

Plasma Sputtering Near Enceladus and the Source of E-Ring Particles
P. K. Haff, A. Eviatar, G. L. Siscoe
  1138

Central Structures in Martian Impact Craters: Morphology, Morphometry and Implications for Substrate Volatile Distribution
W. S. Hale
  1139

Elysium Region, Mars: Characterization of Tectonic Features
J. L. Hall, S. C. Solomon, J. W. Head, P. Mouginis-Mark
  1140

On the Origin of Planetary Rings
A. W. Harris
  1141

Organic Molecules and Carbonaceous Chondrites
H. Hartman, B. Fegley, R. G. Prinn, J. S. Lewis
  1142

Energy Partitioning in Impacts Into Regolith-Like Powders
W. K. Hartmann
  1143

Dirty-Ice Materials of Comets Inferred from VJHK Visual/inf Observations
W. K. Hartmann, D. P. Cruikshank
  1144

On the Distribution of Trace Elements among Phases of Rocks from Stillwater Anorthosite An-I
L. A. Haskin, P. A. Salpas, I. S. McCallum
  1145

Spectral Reflectance Studies of Dark-Haloed Impact Craters: Implications for the Composition and Distribution of Ancient Lunar Basalts
B. R. Hawke, J. F. Bell
  1146

Spectral Studies of the Aristarchus Region: Implications for the Composition of the Lunar Crust
B. R. Hawke, P. G. Lucey, T. B. McCord, C. M. Pieters, J. W. Head
  1147

Geology of Maxwell Montes, Venus
J. W. Head, D. B. Campbell, A. R. Peterfreund, S. A. Zisk
  1148

Characterization of the Banded Terrain in Akna and Freyja Montes, Venus
J. W. Head, A. R. Peterfreund, D. B. Campbell, S. A. Zisk
  1149

Geomorphic Structures on Europa: a New Method for the Recognition of Features Near the Limit of Resolution
P. Helfenstein
  1150

A New Earth-Approaching Asteroid, 1982XB
E. F. Helin, A. W. Harris, J. W. Young, E. F. Tedesco, L. A. Lebofsky, D. Tholen, R. P. Binzel, N. D. Hulkower
  1151

Archean Tectonics: Evidence from the Beartooth Mountains, Montana
D. J. Henry, J. L. Wooden, P. A. Mueller, D. W. Mogk
  1152

On the Early Fractionation of the Lunar Crust
F. Herbert
  1153

26AL-PRODUCTION Rates and 53MN/26AL Production Rate Ratios in Non-Antarctic Chondrites and Their Application to Bombardment Histories
U. Herpers, P. Englert
  1154

Density Estimates of Magmas at High Pressure
P. C. Hess
  1155

Plagioclase Suspensions and the Origin of the Mare Basalt Source Regions
P. C. Hess
  1156

Diogenites and Related Magmas
R. H. Hewins
  1157

Intrinsic Oxygen Fugacity Measurements for Clasts in Diogenites and Mesosiderites
R. H. Hewins, G. C. Ulmer
  1158

Ion Microprobe Measurement of D/h Ratios in Meteorites
R. W. Hinton, J. V. P. Long, A. E. Fallick, C. T. Pillinger
  1159

A New Upper Bound for the Radius of a Highly Conducting Lunar Core Using Inverse Theory
B. A. Hobbs, C. P. Sonett, L. L. Hood, F. Herbert
  1160

Crystal-Liquid Experiments Relevant to Terrestrial Planetary Interiors: Controlling Volatile Activities
J. R. Holloway, S. Jakobsson
  1161

On the Existence and Implications of Coupling Parameters in Cratering Mechanics
K. A. Holsapple
  1162

Effect of Pressure on Infrared-Spectra of Ice VII
W. B. Holzapfel, B. Seiler, M. F. Nicol
  1163

A Correlative Study of Orbital Electron Reflectance and Gama Ray Data with Surface Geology on the South-Central Lunar Far Side
L. L. Hood, R. P. Lin, A. E. Metzger
  1164

A Survey of Astronomical Evidence Relating to the Possibility of an Early Solar Origin for Meteoritic Paleomagnetism
L. L. Hood, C. P. Sonett
  1165

The Chemistry of Projectile Residue in Experimental Microcraters
F. Horz, H. Fechtig, J. Janicke, E. Schneider, H. Kuzcera
  1166

Bunte Breccia of the Ries: Continuous Deposits of Large Impact Craters
F. Horz, R. Ostertag
  1167

Planetary Aggregation and Nebula Tides
K. Hourigan, W. R. Ward
  1168

Crater Ejecta Scaling Laws
K. R. Housen
  1169

Lunar Regolith Evolution
R. M. Housley
  1170

Parana Basin Lavas: Chemical and Petrographic Characteristics
S. S. Hughes, Y. L. Wang, R. A. Schmitt, R. V. Fodor, C. Corwin, A. Roisenberg
  1171

Extreme MG Fractionation and Evidence of TI Isotopic Variations in Murchison Refractory Inclusions
I. D. Hutcheon, I. M. Steele, D. E. S. Wachel, J. D. MacDougall, D. Phinney
  1172

The Origin of Magnetite in Carbonaceous Chondrites
M. Hyman, M. W. Rowe
  1173

The Model of Cratering in Ideal-Plastic Media
B. A. Ivanov
  1174

On the Fragment-Size Distribution of Ejecta of Impact Craters
B. A. Ivanov, A. T. Basilevsky
  1175

Reduction of SIO2 to SI and Metallurgical Transformations in AL by Hypervelocity Impact of Al-Projectiles Into Quartz Sand
C. Jammes, D. Stoffler, A. Bischoff, W. U. Reimold, D. E. Gault
  1176

40AR-39AR Dating of North Ray Crater Ejecta. I.
E. K. Jessberger
  1177

Mesosiderites: (1) Reevaluation of Cooling Rates and (2) Experimental Results Bearing on the Origin of Metal
J. H. Jones
  1178

Experimental Geochemistry in Very Reducing Systems: Extreme REE Fractionation by Immiscible Sulfide Liquids
J. H. Jones, W. V. Boynton
  1179

Large-Scale Permafrost Melting and the Origin of Mega-Aureo on Mars
H.-P. Jons
  1180

Permafrost-Related Types of Large-Scale Dissection, Degradation and Deformation of Martian Landscape
H.-P. Jons
  1181

Application of Accelerator Mass Spectrometry to the Measurement of 14C in Meteorites
A. J. T. Jull, T. H. Zabel, D. J. Donahue, E. L. Fireman
  1182

ALHA81005: a New Sample from the Lunar Highlands?
G. W. Kallemeyn
  1183

Enceladus: an Analog of Terrestrial Plate Tectonism?
J. S. Kargel
  1184

Interstellar Origin of Organic Matter in Meteorites
J. F. Kerridge
  1185

Exsolution Textures in Pyroxenes from Eucrite Breccia Vetluga
N. R. Khisina, L. V. Petushkova, A. Ya. Skripnik
  1186

Thermal History of 15555 Basalt Based on Pyroxene Exsolution
N. R. Khisina, L. V. Petushkova, L. A. Taylor, M. A. Carpenter
  1187

Spectral Reflectance Measurements and Surface Characteristics of Meteoritic Condensates from Solar Furnace Experiments
T. V. V. King, M. J. Gaffey, E. A. King
  1188

Thermal Evolution of a Differentiated Ganymede and Implications for Surface Features
R. L. Kirk, D. J. Stevenson
  1189

26AL Measurements in Individual Lunar Grains
J. Klein, R. Middleton, G. M. Raisbeck, F. Yiou, Y. Langevin
  1190

The Congo Craton: an Old Impact Structure?
G. G. Kochemasov
  1191

Near-Surface Contact Formation of the Lunar High-Ti Basalt Magma: is There a Resembling Process on the Earth?
G. G. Kochemasov
  1192

Determination of Fluorine in Tektites and Impaktites
C. Koeberl, W. Kiesl, F. Kluger, H. H. Weinke
  1193

Zhamanshinites and Aoelloul-Glass Main Element Analyses and Correlations
C. Koeberl
  1194

Lithium in Tektites and Impactites
C. Koeberl, R. Berner
  1195

Comparative Fourier Grain Shape Analysis of Meteoritic Breccias and Lunar Soils
K. Kordesh
  1196

A New Classification and Database for Stratospheric Dust Particles
K. M. Kordesh, I. D. R. MacKinnon, D. S. McKay
  1197

Geochemical, Mineralogical, and Textural Relationships among Allende Refractory Inclusions and Olivine Chondrules
A. S. Kornacki
  1198

On the Origin of Spinel-Rich Inclusions
A. S. Kornacki, R. E. Cohen
  1199

The Nature of Coarse-Grained Cai's
A. S. Kornacki, R. E. Cohen
  1200

Geochemical Study of Individual 1-2 MM Particles from Apollo 16 Soil 65502
R. L. Korotev
  1201

Geochemical Study of Individual 1-2 MM Particles from Apollo 16 Soil 67712
R. L. Korotev
  1202

Carbon Dioxide Loss in Experimentally Shocked Calcite and Limestone
R. K. Kotra, T. H. See, E. K. Gibson, F. Horz, M. J. Cintala, R. S. Schmidt
  1203

Formation of IAB and Iicd Iron Meteorites and the Origin of Their Silicate Inclusions
A. Kracher
  1204

Notes on the Evolution of the Iiiab/pallasite Parent Body
A. Kracher
  1205

Dusty Olivines in the Vigarano (CV3) Chondrite: Evidence for an Ubiquitous Reduction Process
A. Kracher, E. R. D. Scott, K. Keil
  1206

Mapping of Permafrost Indications on Martian Surface: Latitudinal Zonality
R. O. Kuzmin, N. N. Bobina, G. A. Burba, V. P. Shashkina
  1207

Murchison: Contradictions and Clues
P. Lambert
  1208

Shocked Micas
P. Lambert
  1209

Shock Experiments in Shocked Rocks from Lake Mistastin
P. Lambert, R. A. F. Grieve
  1210

Bounds on the Homogeneous Accretion of the Earth
M. A. Lange, T. J. Ahrens
  1211

Shock-Induced CO2-PRODUCTION from Carbonates and a PROTO-CO2-ATMOSPHERE on the Earth
M. A. Lange, T. J. Ahrens
  1212

The New European Project for the Exploration of Asteroids: Agora
Y. Langevin
  1213

Gas-Dust Fractionation and the Origin of Chondritic Meteorites
J. W. Larimer, H. A. Bartholomay
  1214

Chemistry of the Apollo 11 Highland Component
J. C. Laul, J. J. Papike, S. B. Simon, C. K. Shearer
  1215

On Origin of Neon-A
A. K. Lavrukhina, R. I. Kuznetsova
  1216

Mineralogical and Spectral Reflectance Characteristics of the Carlton Rhyolite, Oklahoma: Implications for the Martian Surface
C. A. Lawson, R. V. Morris
  1217

Stagnant Ice in the Martian North Polar Ice CAP
J. H. J. Leach
  1218

The Rapid Ablation Zone -- a Distinctive Terrain Unit in the Martian North Polar Ice CAP
J. H. J. Leach
  1219

The Rare Gas Isotopic Composition in Martian Atmosphere: Additional Data Analysis
L. K. Levsky
  1220

Search for Isotopic Anomalies Correlated with CCF Xenon I. Barium
R. S. Lewis, E. Anders, T. Shimamura, G. W. Lugmair
  1221

Isotopically Anomalous Carbon in the Murchison Meteorite and its Association with Noble Gas Components
R. S. Lewis, E. Anders, P. K. Swart, M. M. Grady, C. T. Pillinger
  1222

Geochemical Studies of Apollo 16 Dimict Breccias
M. M. Lindstrom, P. A. Salpas
  1223

Geochemical Studies of North Ray Crater Breccias
M. M. Lindstrom, P. A. Salpas
  1224

High-K Komatiite Dikes from the Beartooth Mts.
J. Longhi, J. L. Wooden
  1225

Ice-Lubricated Flow in Martian Fretted Channels, and Implications for Outflow Channel Processes
B. K. Lucchitta
  1226

146SM was Alive and Kicking in Allende; Isotopic Abundance Patterns in Allende Residues. II. Nd, SM and SR
G. W. Lugmair, T. Shimamura, R. S. Lewis, E. Anders
  1227

Electron Microscopy of Carbonaceous Matter in Acid Residues from the Orgueil (C1) and Cold Bokkeveld (C2) Meteorites
G. R. Lumpkin
  1228

Microstructural Variations in Allende Carbonaceous Matter
G. R. Lumpkin
  1229

Are Orgueil Carbonates Contemporary with Parent Body Formation?
J. D. MacDougall, G. W. Lugmair, J. F. Kerridge
  1230

Reverse Zoning in Melilite and Crystallization Sequences in Allende Type B Ca-Al Inclusions
G. J. MacPherson, J. M. Paque, E. Stolper, L. Grossman
  1231

Information of Astrophysical Interest in the Isotopes of Solar Wind Implanted Noble Gases
O. K. Manuel, G. Hwaung
  1232

Vaporization of Lunar Highland Rocks: Experimental Investigation
O. M. Markova, O. I. Yakovlev, G. A. Semenov, A. N. Belov
  1233

Recoils: New Opportunities to Study and Date Early Solar System Processes
K. Marti
  1234

Vertical Chemical Differentiation of Massive Impactites, Forming Thick Sheets in Terrestrial Impact Craters
V. L. Masaitis, A. N. Danilin
  1235

- and Volcanism Based on Latest Pioneer Venus and Venera Data
H. Masursky
  1236

Destruction of Rocks by Low Velocity Impact
T. Matsui, T. Waza
  1237

Identification of Tectonic Trends in the Polar Regions of the Inner Planets: Preliminary Results for the Moon and Mars
T. A. Maxwell
  1238

Oxygen Isotopic Composition of ALHA 81005
T. K. Mayeda, R. N. Clayton
  1239

Formation of Mg-Rich Pristine Rocks by Crustal Metasomatism
I. S. McCallum
  1240

Cosmic Dust Collection and Analysis Using the Capture Cell Technique on Space Shuttle Flight STS-3/OSS-1
J. A. M. McDonnell, W. C. Carey, D. G. Dixon
  1241

Spectral Reflectance of Near-Earth Asteroids: Implications for Composition, Origin and Evolution
L. A. McFadden, M. J. Gaffey, T. B. McCord
  1242

The Production Curve for Agglutinates in Lunar Soils
D. S. McKay, A. Basu
  1243

A Petrographic Survey of Regolith Breccias from the Apollo 15 and 16 Collection
D. S. McKay, S. J. Wentworth
  1244

White Portions of Apollo 16 Dimict Breccias are Polymict
J. P. McKinley, G. J. Taylor, K. Keil
  1245

Chondrules in Enstatite Chondrites - Nature and Source of Enstatite
S. G. McKinley, E. R. D. Scott, K. Keil
  1246

Origin of the E Ring: Condensation of Impact VAPOR...OR Boiling of Impact Melt?
W. B. McKinnon
  1247

Geochemistry of Archean Sedimentary Rocks and the Nature of the Archean Crust
S. M. McLennan, S. R. Taylor
  1248

Measures of Chondrite Equilibration
H. Y. McSween, R. E. Grimm
  1249

Petrography of wa, a Well-Known CAI from the Allende Meteorite
G. P. Meeker, J. T. Armstrong, G. J. Wasserburg
  1250

A Detailed Spectral Study of Agenor Linea, Europa
T. A. Meier
  1251

Possible Fossil Craters on Europa
T. A. Meier
  1252

Impact Ejection, Spallation and the Origin of Certain Meteorites
H. J. Melosh
  1253

On the Contribution of Primary Gcr-Particles to the Production of Cosmogenic Nuclides in Meteorites
R. Michel, R. Stuck
  1254

Comparative Formation Processes with Structural and Compositional Orderings of Terrestrial and Extraterrestrial Plagioclases
Y. Miura
  1255

Thermal Evolution of a Howardite Parent Body: Models to Produce Molten Surface-Layer
M. Miyamoto
  1256

Mass Spectra, Shape Distributions and 'vfr' Measurements of Antarctic Meteorites
M. Miyamoto, N. Fujii, K. Ito, Y. Kobayashi
  1257

Silicon Isotopes in Components of the Allende Meteorite
C. Molini-Velsko, T. K. Mayeda, R. N. Clayton
  1258

The Plains and Lineaments of Dione
J. M. Moore
  1259

Elemental Composition of Sulfide Particles from an Ultramafic Xenolith and the Siderophile Element Content of the Upper Mantle
J. W. Morgan, P. A. Baedecker
  1260

Hot SPOT Heat Loss and Tectonic Style on Venus and in the Earth's Archean
P. Morgan
  1261

Hot SPOT Heat Loss, Thermal Isostasy and Gravity on Venus
P. Morgan, R. J. Phillips
  1262

Deformation of Olivine in the Antarctic Ureilites, Allan Hills 77257 and 78262
H. Mori, H. Takeda
  1263

Earth's Gravitational Drop Motions
N.-A. Morner
  1264

Geophysical Changes at the Paleozoic/mesozoic Boundary
N.-A. Morner
  1265

Optical Spectra and Band Assignments for the Hematite (ALPHA-FE2O3)-CORUNDUM (ALPHA-AL2O3) Series
R. V. Morris, H. V. Lauer
  1266

Spectral Evidence and Implications for the Occurrence of Aluminous Iron Oxides on Mars
R. V. Morris, H. V. Lauer, J. L. Gooding, W. W. Mendell
  1267

Some Evidence Concerning the Source Material of Large Glass Objects from the Moon
R. V. Morris, T. H. See, F. Horz
  1268

Radar Characteristics of Thermally-Anomalous Impact Craters on Mars
P. J. Mouginis-Mark, P. R. Christensen, S. H. Zisk
  1269

Ejecta Areas of Impact Craters on the Martian Ridged Plains
P. J. Mouginis-Mark, E. A. Cloutis
  1270

Packing Effect of Fluffy Cometary Particles
T. Mukai, H. Fechtig
  1271

Partitioning of Potassium and Uranium Between Fe-Fes and Silicate Liquids
M. T. Murrell, W. R. Heuser, D. S. Burnett
  1272

Diffusion Cofficient of O in Melilite: Implication to the Thermal History of Allende CAI
H. Nagasawa
  1273

Paleomagnetic Re-Examination of the Allende Carbonaceous Chondrite
T. Nagata, M. Funaki
  1274

Applicability of La-Ce Systematics to Planetary Samples: Preliminary Results and Evaluation
N. Nakamura, M. Tatsumoto, K. R. Ludwig
  1275

Ancient Solar Flare Neon and Solar Cosmic Ray Proton Fluxes from Gas-Rich Meteorites
C. M. Nautiyal, M. N. Rao, T. R. Venkatesan
  1276

Iridium Abundances in the Precambrian-Cambrian Boundary Deposits and Sedimentary Rocks of Russian Platform
M. A. Nazarov, L. D. Barsukova, G. M. Kolesov, A. S. Alekseev
  1277

The Tunguska Event: Mineralogical and Geochemical Data
M. A. Nazarov, M. I. Korina, G. M. Kolesov, N. Vasil'ev, E. Kolesnikov
  1278

YAMATO-7308, an Important Howardite
C. E. Nehru, J. S. Delaney, M. Prinz, M. Weisberg, H. Takeda
  1279

Brachina: a New Type of Meteorite, not a Chassignite
C. E. Nehru, M. Prinz, J. S. Delaney, G. Dreibus, H. Palme, H. Wanke
  1280

Spectral Evidence for Magnetospheric Interactions with the Surfaces of the Icy Galilean Satellites
M. L. Nelson, T. B. McCord, R. N. Clark, T. V. Johnson, D. Matson
  1281

The Depletion of Molybdenum in the Earth, Moon, and in the Eucrite Parent Body
H. E. Newsom, H. Palme
  1282

36CL Depth Profile in Apollo 15 Drill Core
K. Nishiizumi, J. R. Arnold, D. Elmore, X. Z. Ma, H. E. Gove, I. Brissaud
  1283

Measurements of 26AL in Apollo 15 Drill Core Using Accelerator Mass Spectrometry
K. Nishiizumi, J. R. Arnold, J. Klein, R. Middleton
  1284

Change of Elemental Composition of the Iron Meteorite by Artificial Ablation Process
K. Nogami
  1285

Moore County Meteorite: Petrology and Thermal History
G. L. Nord
  1286

Is Carbon in the Ancient Solar Wind Isotopically Light?
S. J. Norris, P. K. Swart, I. P. Wright, C. T. Pillinger
  1287

Half-Life of 26AL
T. L. Norris, A. J. Gancarz, D. J. Rokop, K. W. Thomas
  1288

Nucleation Theory is not Applicable to the Condensation of Refractory Grains in the Primitive Solar Nebula
J. Nuth, B. Donn
  1289

Thermal Metamorphosis of SI2O3 (circumstellar Dust Analog)
J. Nuth, B. Donn
  1290

The Oblique Impact Hypothesis and Relative Probabilities of Lunar and Martian Meteorites
L. E. Nyquist
  1291

Formation of a Lunar Granite 4.1 AE ago
L. Nyquist, C.-Y. Shih, B. Bansal, H. Wiesmann, J. Wooden
  1292

Constraints on the Impact-On Origin of SNC Meteorites
J. D. O'Keefe, T. J. Ahrens
  1293

Element Correlations among North American Tektites
T. C. O'Reilly, L. A. Haskin, E. A. King
  1294

Chemical Composition for the Minerals from the Norin-Shibir Meteorite - an Anomalous Octahedrite with Silicate Inclusion
Eu. G. Osadchii, N. I. Zaslavskaya, G. V. Baryshnikova
  1295

Petrographic, Geochemical and Structural Studies on Impact Breccia Dikes of the Rochechouart Impact Structure, SW Fran
W. Oskierski, L. Bischoff
  1296

Noble Gases in the Brachina and Chassigny Meteorites
U. Ott, F. Begemann, H. P. Lohr
  1297

Composition Dependence of the BERYLLIUM-10 Production Rate in Stony Meteorites
D. K. Pal, C. Tuniz, R. K. Monoit, W. Savin, T. H. Kruse, G. F. Herzog
  1298

Elephant Moraine Polymict Eucrites: a Eucrite-Howardite Compositional Link
H. Palme, B. Spettel, A. Burghele, G. Weckwerth, H. Wanke, J. S. Delany, M. Prinz
  1299

Saturn's E-Ring and Satellite Enceladus
K. D. Pang, C. C. Voge, J. W. Rhoads, J. M. Ajello
  1300

Apollo 11 Regolith Breccias: the Highland Component
J. J. Papike, S. B. Simon, C. K. Shearer
  1301

Experimental Evidence for Slow Cooling of Type B Cais from a Partially Molten State
J. M. Paque, E. Stolper
  1302

An SEM Petrographic Study of C3(V) Meteorite Matrix
J. A. Peck
  1303

Thermodynamic Properties and Origin of Meteoritic Minerals. III. Heideite, FETI2S4
M. I. Petaev, K. S. Gavrichev, V. M. Gurevich, E. Osadchy, T. A. Stolyarova, V. E. Gorbunov, I. L. Khodakovsky
  1304

Venus: Evidence for High Dielectric Constants in Elevated Regions
G. H. Pettengill, P. G. Ford, S. D. Nozette
  1305

Deformation Sequence of Tharsis as a Guide to Thermal Evolution
R. J. Phillips, M. P. Golombek
  1306

Evidence for Early Formation of Anorthosite in the Evolution of Archaen Greenstones at Pipestone Lake, Manitoba
W. C. Phinney, D. A. Morrison, D. E. MacZuga, L. D. Ashwal
  1307

Composition of the Upper Lunar Crust: Preliminary Results from Near Infrared Reflectance Data
C. M. Pieters
  1308

Large Craters or Small Basins on the Moon
R. J. Pike
  1309

Impact Distribution of Early Geocentric Moonlets on the Moon
P. Pinet, A. Cazenave
  1310

On the Isotopic Composition of Meteoritic Ruthenium
H. Poths, S. Schmitt-Strecker, F. Begemann
  1311

Silicates in IAB and IIICD Irons, Winonaites, Lodranites an Brachina: a Primitive and Modified-Primitive Group
M. Prinz, C. E. Nehru, J. S. Delaney, M. Weisberg
  1312

Globular Silicate Inclusions in IIE Irons and Sombrerete: Highly Fractionated Minimum Melts
M. Prinz, C. E. Nehru, J. S. Delaney, M. Weisberg, E. Olsen
  1313

Nitrogen Isotopes in Iron Meteorites
C. A. Prombo, R. N. Clayton
  1314

26AL and 10BE in Deep Sea Stony Spherules; Evidence for Small Parent Bodies
G. M. Raisbeck, F. Yiou, J. Klein, R. Middleton, Y. Yamakoshi, D. E. Brownlee
  1315

A New Method to Determine the Isotopic Composition of Oxygen on a Microscale
R. S. Rajan, C. L. Melcher, S. Faragalla, M. Mendenhall, T. A. Tombrello, A. P. Sloan, L. Brown
  1316

Chemical and Textural Study of Qingzhen, a Highly Unequilibrated Enstatite Chondrite
E. R. Rambaldi, R. S. Rajan, D. Wang
  1317

Experimental Investigation of Metal-Silicate Partitioning of Some Lithophile Elements (ta, mn, v, Cr)
W. Rammensee, H. Palme, H. Wanke
  1318

Planetary Tectonics: an Integrated View
A. S. P. Rao
  1319

Confirmation of Solar Flare Neon Composition Using Lunar Pyroxenes and SCR Proton Fluxes in Last Million Years
M. N. Rao, C. M. Nautiyal, J. T. Padia, T. R. Venkatesan
  1320

Sulphur Isotopes in Lunar Soils - Surface VS. Bulk Properties
C. E. Rees, H. G. Thode
  1321

Petrographic and Geochemical Studies on the Basement Rocks of the Rochechouart Meteorite Crater, France, and Pseudotachylite Therein
W. U. Reimold, L. Bischoff, J. Nieber-Reimold, W. Oskierski, A. Rehfeldt
  1322

A Study on Subophitic and Unique Strangers in Kreep-Rich Poikilitic Apollo 16 Impact Melt Rocks
W. U. Reimold, R. Borchardt, F. Mollers
  1323

New Analyses of Mare Basalts
J. M. Rhodes, D. P. Blanchard
  1324

- and Microsegregation in a Solidifying Lunar Magma Ocean
A. Rice
  1325

Scanning Electron Microscopy of Condensation Related Minerals: the Bjurbole Meteorite
F. J. Rietmeijer, I. D. R. MacKinnon
  1326

Geochemical Relationships Between the Earth's Core and Mantle
A. E. Ringwood
  1327

Grain Size of Luna 24 Core Samples: New Data
O. D. Rode, A. V. Ivanov
  1328

The Temperature and Pressure Effects on Silicon Diffusion in a Simple Silicate Melt
A. Ross
  1329

Rheology of the Arsia Mons Lava Flows
L. E. Roth, R. S. Saunders
  1330

The Effect of Thermal Variations on Reflectance Spectra of Mafic Minerals
T. L. Roush, R. B. Singer
  1331

The Adhi-Kot Enstatite Chondrite Breccia and Implications for the Origin of Silica-Rich Clasts and Chondrules
A. E. Rubin
  1332

Lunar Paleomagnetism, Polar Displacement and Primeval Lunar Satellites
S. K. Runcorn
  1333

Martian Grabens and Permafrost Thickness on Mars
C. J. Runyon, M. P. Golombek
  1334

Phosphorus Partitioning Between Silicate-Fe Metal and Sulfide Melts: Implications for Sulfide or Metal Fractionation on the Moon
M. J. Rutherford
  1335

Compositions of Samples from Traverses of Stillwater Anorthosites An-I and An-Ii
P. A. Salpas, L. A. Haskin, I. S. McCallum
  1336

Strength-Gravity Transition for Impact Craters in Wet Sand
R. M. Schmidt
  1337

Development of the Quarter-Space Technique for Cratering Experiments on a Centrifuge
R. M. Schmidt, A. J. Piekutowski
  1338

Linear and Curvilinear Feature Detectors for Remote Sensing Images
E. Schonfeld
  1339

High Spatial Resolution Mg/al Maps of Large Areas of the Moon
E. Schonfeld, E. A. Bruckenthal
  1340

High-Velocity Clustered Impacts: Experimental Results
P. H. Schultz, D. E. Gault
  1341

The Beginning and End of Mare Volcanism on the Moon
P. H. Schultz, P. D. Spudis
  1342

An Inventory of Some Unusual Geologic Features
D. H. Scott
  1343

Petrologic Similarities among Chondrules in h, ll, co, CM and E Chondrites
E. R. D. Scott, G. J. Taylor
  1344

Thermoluminescence Sensitivity of 16 Type 3 Ordinary Chondrites
D. W. G. Sears, K. S. Weeks
  1345

Large Glassy Objects from Apollo 16
T. H. See, F. Horz, R. V. Morris, D. Blanchard, R. S. Seymour
  1346

Experimental Study of Segregation in Plane Front Solidification and its Relevance to Iron Meteorite Solidification
R. Sellamuthu, J. I. Goldstein
  1347

Impact-Generated Plume Traces on Mars
C. K. Seyfert
  1348

Tectonic Origin of Mare Ridges: Evidence from Basalt Stratigraphy in Mare Imbrium
V. L. Sharpton, J. W. Head
  1349

The Effect of Local Magnetic Interactions on the Crystal Field Spectra of FE3+ in Minerals
D. M. Sherman
  1350

57FE Mossbauer Study of - Implications the FE3+ Mineralogy of Mars
D. M. Sherman, R. B. Singer
  1351

Micrographic Granite: More from Apollo 14
J. W. Shervais, L. A. Taylor
  1352

Texturally-Pristine Clasts from Apollo 14: Implications for Igneous Processes
J. W. Shervais, L. A. Taylor
  1353

Sccrv Revisited -- Possible Evidence for a Partially Molten Magma Ocean
D. N. Shirley
  1354

Petrology of the Apollo 11 Highland Component
S. B. Simon, J. J. Papike, C. K. Shearer, J. C. Laul
  1355

The Effect of an Impact-Generated Gas Cloud on the Acceleration of Solid Ejecta
A. V. Singer
  1356

Effects of Mineral Grain Size and Physical Particle Size on Spectral Reflectance of Basalts
R. B. Singer, P. L. Blake
  1357

Spectral Reflectance Properties of Particulate Weathered Coatings on Rocks: Laboratory Modeling and Applicability to Mars
R. B. Singer, T. L. Roush
  1358

Diverse Textures and Pyroxene Chemistry in Enstatite Chondrites: Mechanical Accretion of Porphyritic Chondrules
J. V. Smith
  1359

Pre-Terrestrial Alteration of Achondrite 77005: Effect of Martian Volatiles?
J. V. Smith, I. M. Steele
  1360

Chemical Composition of 24 Chondrules in Indarch e4 Chondrite
J. V. Smith, M. R. Smith, R. A. Schmitt
  1361

Far-Eastern Nonmare Samples: New Data from Luna 20 and 16
M. R. Smith, R. A. Schmitt, P. H. Warren, G. J. Taylor, K. Keil
  1362

Petrogenesis of Shergottites
M. R. Smith, R. A. Schmitt
  1363

Mobility of Pores in Ices in the Solar System
R. Smoluchowski, M. A. Marie
  1364

Investigation of Radiation Centers in Quartz of Rocks from Meteorite Crater
P. L. Smolyansky, A. I. Raikhlin
  1365

Venus Banded Terrain: Evaluation of Tectonic Models for the Origin of Banding
S. C. Solomon, J. W. Head
  1366

The Structure of the Isidis Basin, Mars, from Gravity Anomalies
S. C. Solomon, W. L. Sjogren, S. R. Bratt
  1367

Argon Age of Apollo 15 Yellow Impact Glass
R. R. Spangler
  1368

39AR-40AR Ages for the Apollo 15 Green and Yellow Glasses
R. R. Spangler
  1369

Ganymede in the Thermal Infrared: Preliminary Analysis of Voyager IRIS Data
J. R. Spencer
  1370

Rock Property Measurements Appropriate to Planetary Crusts
H. Spetzler
  1371

The Excavation of Lunar Multi-Ring Basins: Additional Results for Four Nearside Basins
P. D. Spudis
  1372

Some Geochemical and Geophysical Implications of Very Old and Very Young Lunar Mare Volcanism
P. D. Spudis, P. H. Schultz
  1373

Ballistic Diffusion on Planetary Satellites
S. W. Squyres, C. Sagan
  1374

Search for Extinct Actinides in Meteorites Through Studies of Noble Gases in Mineral Separates from Allende
B. Srinivasan, G. R. Lumpkin, F. di Brozolo, R. S. Lewis
  1375

Visualization of the Pioneer-Venus Radar Data for Ishtar Terra and Beta Regio
D. G. Stankevich, Yu. V. Kornienko, Yu. G. Shkuratov, A. T. Basilevsky
  1376

The Mars Geoscience Climatology Orbiter
D. A. Steffy
  1377

On the Age of Venus Highland Topography: Constraints from the Viscous Relaxation of Relief
S. K. Stephens, S. C. Solomon, J. W. Head
  1378

The Color of Meteoritic Hibonite: an Indicator of Oxygen Fugacity
E. Stolper, P. Ihinger
  1379

The Relationship of Rilles and High Magnesium Material in the Cauchy Region of the Moon
P. L. Strain, C. G. Andre
  1380

Chemical Variations in the Bishopville Enststite Achondrite
M. M. Strait, C. B. Moore, D. P. Blanchard
  1381

The Cratering Record of Galileo Regio, Ganymede
R. G. Strom, R. Casacchia
  1382

Gas Permeability of Three Chondrites
N. Sugiura, N. S. Brar, D. W. Strangway, T. Matsui
  1383

Magnetic Properties of Lunar Samples 60315 and 60018: Strongly Magnetic Breccias
N. Sugiura, D. W. Strangway
  1384

New Data on the Composition, Structure and Properties of Venus Rocks Obtained by VENERA-13 and VENERA-14
Yu. A. Surkov, L. P. Moskalyeva, O. P. Scheglov, V. V. Gromov
  1385

Carbon and Nitrogen Studies of Carbonaceous and Unequilibrated Ordinary Chondrites
P. K. Swart, M. M. Grady, S. J. Norris, I. P. Wright, C. T. Pillinger
  1386

Mechanism for Crater Debris Escape from Planetary-Sized Bodies
H. F. Swift, B. C. Clark
  1387

Xenon in Irradiated Chondrules
T. D. Swindle, M. W. Caffee, C. M. Hohenberg
  1388

Chondrite - Achondrite Transition: Mineralogic and Chemical Characteristics of an LL7 Chondrite
H. Takeda, T. J. Huston, M. E. Lipschutz
  1389

Mineralogical Comparison of Lunar and Chondritic Vesicular Melt Breccias
H. Takeda, M. Miyamoto, T. Ishii
  1390

Comparison of Yamato and Victoria Land Polymict Eucrites: View from Mineralogy and Isotopic Study
H. Takeda, H. Mori, J. L. Wooden, L. E. Nyquist, J. S. Delaney, M. Prinz
  1391

Flood-Lava Model for the Olympus Mons Aureole Deposits
K. L. Tanaka
  1392

Ancient (approximately 4.2 Ae) Highlands Volcanism: the Gabbronorite Connection?
L. A. Taylor, J. W. Shervais, R. H. Hunter, J. C. Laul
  1393

Elemental Fractionation in the Solar Nebula and Planetary Compositions: a "predestination" Scenario
S. R. Taylor
  1394

Residual Lower Continental Crustal Compositions
S. R. Taylor, S. M. McLennan, R. J. Arculus, M. T. McCulloch
  1395

Geochemistry of Loess and Continental Crustal Composition
S. R. Taylor, S. M. McLennan, M. T. McCulloch
  1396

Photochemical Production of Isotopic Anomalies in the Early Solar System
M. H. Thiemens, J. E. Heidenreich, L. Lundberg
  1397

Two-Phase Gravitational Instabilities in Thin Disks with Application to the Origin of the Moon
A. C. Thompson, D. J. Stevenson
  1398

An Exotic Fe-Ni Layered Material: an Improved Characterization of the "poorly Characterized Phase" in C2M Carbonaceous Chondrites
K. Tomeoka, P. R. Buseck
  1399

Continuing Investigations of Sweeping Jovian Resonances: the 7:3 and 3:2 Resonances
M. Torbett, R. Smoluchowski
  1400

Mass Loss from Proto-Sun Formation and Evolution of the Solar Nebula
B. M. P. Trivedi
  1401

Sample Collection on Comet Flybys
P. Tsou, D. Brownlee, A. Albee
  1402

The Geology of the Thaumasia Northeast Quadrangle of Mars
M. F. Tuesink
  1403

Mechanisms of Early Planetary Differentiation
D. L. Turcotte, S. H. Emerman
  1404

Magnesian Noritic and Basaltic Clasts in the Garland and Peckelsheim Diogenites
C. Varteresian, R. H. Hewins
  1405

Complex Graphite, Sulfide, Arsenide, Palladium and Platinum Mineralization in a Pegmatoid Pyroxenite of the Stillwater Complex, Montana
A. Volborth, R. M. Housley
  1406

Xe Isotopic Composition in Different Fractions of the Kainsaz Chondrite
D. Vu Minh, A. V. Fisenko, L. F. Semjonova, A. K. Lavrukhina, Ju. A. Shukolyukov
  1407

40AR-39AR Age of the Vetluga Meteorite
D. Vu Minh, M. M. Fugzan, G. M. Kolesov, A. Ya. Skripnik, Yu. A. Shukolyukov
  1408

Isotopic Composition of xe and KR in - and Micro-Inclusions of Iron Meteorites
D. Vu Minh, P. S. Goel, N. I. Zaslavskaya, Yu. A. Shukolyukov
  1409

A Search for xe Isotope Anomalies Produced by Neutron Irradiation in Space
D. Vu Minh, Yu. A. Shukolyukov, A. Ia. Scripnic
  1410

A Comparison of Lunar and Terrestrial Early Crust Formation
D. Walker
  1411

Filamentous Microfossils from the 3.1-3.5 Billion-Year Swaziland Supergroup, Barberton Mountain Land, South Africa
M. M. Walsh, D. R. Lowe
  1412

Mobile Trace Elements in Shocked Chondrites: Variations with Petrology and 40AR/39AR Ages
T. M. Walsh, T. J. Huston, M. E. Lipschutz
  1413

Geochemical Evidence for the Formation of the Moon from Material of the Earth's Mantle
H. Wanke, G. Dreibus, H. Palme, W. Rammensee, G. Weckwerth
  1414

A Relationship Between Carbonaceous (cv) and Enstatite Chondrites
D. A. Wark
  1415

Crystal Chemical Effects on the Bulk Compositions of Allende Group i Ca-Al Inclusions
D. A. Wark
  1416

Evidence for Fe-Ni Dust Fractionation in the Protosolar Nebula
D. A. Wark
  1417

The Scorpion, a Novel Spinel-Hibonite Inclusion in the Allende Meteorite
D. A. Wark, W. V. Boynton
  1418

Regolith Breccia ALHA 81005: Evidence of Lunar Origin, and Nature of Pristine and Nonpristine Clasts
P. H. Warren, G. J. Taylor, K. Keil
  1419

Seventh Foray: Whitlockite-Rich Lithologies, a Diopside-Bearing Troctolitic Anorthosite, Ferroan Anorthosites, and KREEP
P. H. Warren, G. J. Taylor, K. Keil, G. W. Kallemeyn, J. T. Wasson
  1420

Magnetic Properties of Manmade fe and Feni Alloys and the Feni Phases in Meteorites: a Review
P. Wasilewski
  1421

O-Isotope Anomalies: Interpretation in Terms of Presolar Solid and Gas Components and Nebula Fractionation Processes
J. T. Wasson, D. N. Shirley
  1422

Lithospheric Thickness Based on Volcano Spacing in the Tharsis Region of Mars
T. R. Watters, T. A. Maxwell
  1423

Size Distribution of Fine Fragments Produced from Destruction of Rocks by Low Velocity Impact
T. Waza, T. Matsui
  1424

Kinks, Clumps, and Accretion in Saturn's F-Ring
S. J. Weidenschilling, D. R. Davis
  1425

An Improved Thermal Model for Cometary Nuclei
P. R. Weissman, H. H. Kieffer
  1426

Frigoris Revisited
J. L. Whitford-Stark
  1427

Effects of the Procellarum Basin on Lunar Geology, Petrology, and Tectonism
D. E. Wilhelms
  1428

Chondrule Compositions and the Accretion of Chondrites
L. L. Wilkening
  1429

Theoretical Aspects of Photoclinometric Terrain Profiling on the Galilean Satellites
L. Wilson, M. A. Brown, E. M. Parmentier, J. W. Head
  1430

Evidence of Ancient Fluvial Activity Along the Plateau-Plains Boundary in NW Mare Acidalium Quadrangle (MC-4), Mars
N. E. Witbeck, J. R. Underwood
  1431

Searching for Comet Cores among Apollo/amor Asteroids
C. A. Wood
  1432

L Chondrites: a Photogeologist's Search for Physical Processes
C. A. Wood, A. Silliman
  1433

Formation of Cai's and Chondrules in the Nebular Shock Front
J. A. Wood
  1434

REE Fractionation in ST. Severin Phosphates: Implications for Pu-Ree Coherence
D. S. Woolum, D. S. Burnett, C. J. Maggiore, T. M. Benjamin
  1435

Light Nitrogen, its Composition, Association and Location in the Allende and Murchison Meteorites
I. P. Wright, S. J. Norris, C. T. Pillinger, R. S. Lewis, E. Anders
  1436

Structural Fabric Elements Observed in Leoville (CV3)
J. Wright-Clark, G. G. Goles
  1437

Model for Calculating Viscosities in the NA2O-FEO-FE2O3-SIO System
J. M. Wu, L. C. Klein
  1438

Lunar and Planetary Topographic Mapping
S. S. C. Wu
  1439

Mass-Spectrometric Investigation of the Chondrite at the High Temperature
O. I. Yakovlev, O. M. Markova, G. A. Semenov, A. N. Belov
  1440

Chemical Compositions of "chondrite Spherules" from Deep Sea Sediments Using Instrumental Neutron Activation
K. Yamakoshi
  1441

The Relevance of Hydrogen on the Origin of Meteorites
J. Yang, S. Epstein
  1442

Carbon Isotopic Composition of Individual, Low Molecular Weight Hydrocarbons and Monocarboxylic Acids from Murchison Meteorite
G. Yuen, N. Blair, D. Des Marais, S. Chang
  1443

Morphology of the Outer Shells of the Tunguska Spherules
M. Zbik, Z. I. Wigury
  1444

Elevation-Dependent Corrections for Thermal Inertias on Mars
J. R. Zimbelman, R. Greeley
  1445

Surface Properties of Ascraeus Mons Obtained from IRTM Data
J. R. Zimbelman, R. Greeley
  1446

Mineral Composition of Martian Regolith: Thermodynamic Assessment
M. Yu. Zolotov, Yu. I. Sidorov, V. P. Volkov, M. V. Borisov, I. L. Khodakovsky
  1447

Variation of Stress with Depth in Ganymede's Lithosphere: Implications for Tectonic Evolution
M. T. Zuber, E. M. Parmentier
  1448