Lunar and Planetary Institute






Twelfth Lunar and Planetary Science Conference

TABLE OF CONTENTS

no.

The Moon io and Serendipity
I. Adler, L. I. Yin, G. Coyle, T. Tsang 		  1001

FO2 Estimates in 14 Mesosiderites from Silicate-Iron Equilibria of Proposed Parent Melts
W. N. Agosto 		  1002

Where do we go from here in lunar research? Results of an opinion poll
A. L. Albee, R. A. Preston 		  1003

Measurement of Small Quantities of Nitrogen by Neutron Activation
V. A. Alexeev, A. I. Ivliev, A. K. Lavrukhina 		  1004

Electromagnetic Effects and the Structure of the Saturnian Rings
H. Alfven 		  1005

Martian Soil and Terrestrial Palagonite
C. C. Allen, J. L. Gooding, M. Jercinovic, K. Keil 		  1006

Hydrothermally Altered Impact Melt from Brent and Ries Craters
C. C. Allen, J. L. Gooding, K. Keil 		  1007

Compositional Deviations in Lunar Pyroxenes: Analytical Error or Non-Stoichiometry
D. J. Andersen, D. H. Lindsley 		  1008

Regional Chemical Setting of the Apollo 16 Landing Site and the Importance of the Kant Plateau
C. G. Andre, F. El-Baz 		  1009

The Allende Pink Angel: its Mineralogy, Petrology and the Constraints of its Genesis
J. T. Armstrong, G. J. Wasserburg 		  1010

Diaplectic Glass and Fusion-Formed Glass: Comparative Studies on Shocked Anorthosite from Manicouagan Crater, Canada
J. Arndt, I. Gonzalez-Cabeza 		  1011

Effects of Lateral Resolution on the Interpretability of Geologic Features Sampled by the Pioneer-Venus Altimeter
R. E. Arvidson 		  1012

Tentative Speculations on Lunar Sample Transport
M. G. Austin, B. R. Hawke 		  1013

Gabbroic Anorthosite Impact Cratering Time Dependent Z Flow Fields for Two Different Impact Energies
M. G. Austin, J. M. Thomsen, D. L. Orphal, W. F. Borden, S. A. Larson, P. H. Schultz 		  1014

Transient Cavity Calculations of Centrifuge Cratering Experiments at Two Different Values of Gravity
M. G. Austin, J. M. Thomsen, S. F. Ruhl 		  1015

The Metal Chloride and Elemental Sulfur Condensates in the Venusian Troposphere - is it Possible?
V. L. Barsukov, I. L. Khodakovsky, V. P. Volkov, Yu. I. Sidorov, V. A. Dorofeeva, N. E. Andreeva 		  1016

Azimuthal Variations in the Structure of Saturn's Rings
J. A. Bastin 		  1017

On the Solar Wind Element Content and the Bulk Chemical Composition of Lunar Soils
A. Basu 		  1018

Constraints on the Use of Aml Diagrams as a Tool to Monitor the Mineralogical Maturation of Lunar Regolith
A. Basu, S. A. Griffiths, D. S. McKay, G. Nace 		  1019

The Temperature Profile of Venus Computed Using the Thermal Pressure, Pth = at + B
J. R. Baumgardner, O. L. Anderson 		  1020

Silicon and Oxygen Isotopes in Some Selected Allende Inclusions
R. H. Becker, S. Epstein 		  1021

Reiner Gamma: Preliminary Results from Telescopic Remote Sensing
J. F. Bell, B. R. Hawke 		  1022

Induced Radioactivity, Tracks and Rare Gas Studies in South Ray Crater Rocks
N. Bhandari, M. B. Potdar, P. N. Shukla 		  1023

Accumulation of Solar Wind Effects in Lunar Dust Grains: a Reappraisal of Solar Wind Simulation Experiments
J. P. Bibring, J. Borg, J. C. Dran, Y. Langevin, M. Maurette, J. C. Petit, F. Rocard 		  1024

Automated Classification of Lunar Spectral Reflectance Data
M. J. Bielefeld, C. M. Pieters 		  1025

Could Mixing of "pristine" Rocks have Produced the Observed Suite of Highland Rocks?
A. B. Binder 		  1026

Thermoelastic Stress and Tectonic Evidence in Support of an Initially Totally Molten Moon - or, the "magma Ocean" was 1738KM Deep
A. B. Binder 		  1027

Thermal Metamorphism of Feldspar Clasts in Impact Melt Rocks from Lappajarvi Crater, Finland
A. Bischoff, D. Stoffler 		  1028

Leighton Gas-Rich Chondrite: Trace Element Contents and Mineralogy/petrology of Selected Inclusions
S. Biswas, H. Y. McSween, M. E. Lipschutz 		  1029

Remnants from the Ancient Mare Crust Iii: Norite 78236
D. P. Blanchard, G. A. McKay 		  1030

Electron Microscopic Observations of Micron-Sized Lunar Soil
G. E. Blanford, D. S. McKay, G. Nace, I. D. R. MacKinnon 		  1031

Partitioning of Trace Elements among Coexisting Opaque Oxides in Apollo 17 Basalts Using a Proton Probe Microanalyzer
H. Blank, R. Nobiling, K. Traxel, A. El Goresy 		  1032

Resetting of 40AR/39AR Ages in Suevite Ejecta from the Ries Crater
D. D. Bogard, F. Horz, P. Johnson, D. Stoffler 		  1033

Depositional and Irradiational History of the 15008 Core
D. D. Bogard, R. V. Morris, P. Johnson, H. V. Lauer 		  1034

Volatile Components in the Lunar Magmatic Processes
O. A. Bogatikov, D. I. Frikh-Khar, N. A. Ashikhmina, Yu. P. Dikov, E. E. Lazko, E. V. Sweshnikova 		  1035

Accessory Minerals in North Ray Crater Breccias, Apollo 16
R. Borchardt, D. Stoffler 		  1036

Shock-Release of Vapor from Calcite
M. B. Boslough, J. Vizgirda, T. J. Ahrens 		  1037

Condensation of Refractory Lithophile Trace Elements in the Solar Nebula and in Supernovae
W. V. Boynton, C. C. Cunningham 		  1038

The Evolution of Multi-Ringed Basins: Cooling, Subsidence and Thermal Stress
S. R. Bratt, S. C. Solomon, J. W. Head 		  1039

Roaldite, a New Nitride in Iron Meteorites
V. F. Buchwald, H. P. Nielsen 		  1040

Inversion of Lunar Geophysical Data
W. R. Buck, M. N. Toksoz 		  1041

ALHA 77005: Uranium Content of Phosphates and Thermoluminescence Studies
R. K. Bull, S. A. Durrani 		  1042

Troctolite 76535: a Study in the Preservation of Early Isotopic Records
M. Caffee, C. Hohenberg, B. Hudson 		  1043

Thermal Evaporation of Giant Gaseous Protoplanets
A. G. W. Cameron, W. M. Decampli, P. H. Bodenheimer 		  1044

Sm-Nd Age of Lunar Lherzolite 67667
R. W. Carlson, T. Tanaka, G. W. Lugmair 		  1045

Meteorites from the Asteroid Belt: the Stony-Iron Connection
C. R. Chapman, R. Greenberg 		  1046

Curium?
J. H. Chen, G. J. Wasserburg 		  1047

Martian Regolith Properties: Viking IRTM Spectral Differencing Results
P. R. Christensen 		  1048

Mega-Lahars (?) in the Elysium Region, Mars
E. H. Christiansen, R. Greeley 		  1049

The Mercurian Regolith: an Evaluation of Impact Glass Production by Micrometeroid Impact
M. J. Cintala 		  1050

Evolution of Volatiles during Regolith Maturation: U-Pb Ages of Parent Rocks
E. H. Cirlin, R. M. Housley 		  1051

Magnetic Properties of Shergotty and Zagami Meteorites
S. M. Cisowski 		  1052

Compositional Variations in the Hadley Apennine Region
P. E. Clark, B. R. Hawke 		  1053

Ubiquitous Titanium Isotopic Anomalies
D. D. Clayton 		  1054

Redox Processes in Chondrules and Chondrites
R. N. Clayton, T. K. Mayeda, J. L. Gooding, K. Keil, E. J. Olsen 		  1055

Mars: Ground Ice Replenishment from a Subpermafrost Groundwater System
S. M. Clifford 		  1056

A Model for the Removal and Subsurface Storage of a Primitive Martian Ice Sheet
S. M. Clifford 		  1057

A Study of the Makoia C3(V) Carbonaceous Chondrite and the Origins of Cai's
R. Cohen 		  1058

The Olympus Mons Paradox: why Hasn't the Martian Lithosphere Failed Under the Load?
R. P. Comer, S. C. Solomon 		  1059

Miniregoliths II: Anatomy of Lunar Surface Soil
G. M. Comstock 		  1060

Dark-Ray Craters on Ganymede
J. Conca 		  1061

Possible terrestrial analogs of Vahalla and other ripple-ring basins, Multi-ring Basins
C. A. Wood 		  1062

An io Thermal Model with Intermittent Volcanism
G. J. Consolmagno 		  1063

Can a Geophysically Reasonable Moon Make Mare Basalts?
G. J. Consolmagno, J. M. Harrigan, W. R. Buck 		  1064

On the Formation of Regular Satellites of Giant Planets
A. Coradini, C. Federico, G. Magni 		  1065

Non-Terrestrial Materials (ntm's) Utilization
D. R. Criswell 		  1066

Cratering on Ganymede and Callisto: Comparisons with the Terrestrial Planets
S. K. Croft 		  1067

Hypervelocity Impact Craters in Icy Media
S. K. Croft 		  1068

The Modification Stage of Simple Craters
S. K. Croft 		  1069

On the Origin of Pit Craters
S. K. Croft 		  1070

Avoiding Close Encounters: Collisional Evolution of Trojan Asteroids
D. R. Davis, S. J. Weidenschilling 		  1071

Lunar Nonelastic Scatter Iron Concentrations from Orbital Gamma-Ray Data: Analysis of Thermal Neutron Flux Depression by KREEP
P. A. Davis, M. J. Bielefeld 		  1072

Selenographic Distribution of Apparent Crater Depths
R. A. de Hon 		  1073

Metamorphism in Mesosiderites: Radical Chemical Changes in a Post-Igneous Silicate Regolith
J. S. Delaney, G. E. Harlow, M. Prinz, C. E. Nehru 		  1074

A New Basalt Group from Howardites: Mineral Chemistry and Relationships with Basaltic Achondrites
J. S. Delaney, M. Prinz, C. E. Nehru, G. E. Harlow 		  1075

Major-Element Chemistry of Apollo 11 Volcanic Glasses
J. W. Delano 		  1076

Major-Element Composition of Volcanic Green Glasses from Apollo 14
J. W. Delano 		  1077

Major-Element Compositions of High-Titanium Volcanic Glasses from Apollo 14
J. W. Delano 		  1078

Glasses of Impact Origin from Apollo 11 and Apollo 12: Evidence for Volatile-Loss and Mare/highland Mixing
J. W. Delano, D. H. Lindsley, R. Rudowski 		  1079

Mare Volcanic Glasses: a tale of Two Arrays
J. W. Delano, K. Livi 		  1080

Zircon Saturation and REE Partition Coefficients in Lunar Basalts and Granites
J. E. Dickinson, P. C. Hess, M. J. Rutherford 		  1081

Theory and Application of the Negative Branch of Polarization for Airless Planetary Objects
A. Dollfus, M. Wolff 		  1082

Partitioning of SM Between Hibonite and Corundum and Silicate Melt
M. J. Drake 		  1083

On the Differentiation of the Terrestrial Planets
M. J. Drake, C. J. Hostetler 		  1084

On the Mobilization and Redistribution of AU and Other Siderophiles in Lunar Highland Materials
G. Dreibus, H. Palme, W. Rammensee, B. Spettel, H. Wanke 		  1085

Temperature-Induced Spectral Variations of Lunar-Simulated Fe-Ti Silicate Glasses
M. D. Dyar, R. G. Burns 		  1086

Plasma Synthesis of Carbonaceous Material with Noble Gas Tracers
M. Dziczkaniec, G. R. Lumpkin, K. Donohoe, S. Chang 		  1087

Siderophile, Volatile, and Incompatible Trace Elements in Apollo Breccia 66095
M. Ebihara, R. Wolf, E. Anders 		  1088

The "uweinat Desert" of Egypt, Libya and Sudan: a Fertile Field for Planetary Comparisons of Crater Forms
F. El-Baz 		  1089

Sulfide-Rich Chondrule Rims in Bishunpur (L3) Chondrite: Types, Textures, Mineralogy and Genetic Implications
A. El Goresy, P. Ramdohr, E. R. Rambaldi 		  1090

Irradiation Records of Acapulco and Other Meteorites Derived from 53MN and 26AL Measurements
P. Englert, U. Herpers, W. Herr 		  1091

Martian Fretted Terrain
D. B. Eppler, M. C. Malin 		  1092

Thorium in the Lunar Central Highlands
M. I. Etchegaray-Ramirez, E. L. Haines, A. E. Metzger 		  1093

An In-Depth Study of Neon and Argon in Lunar Soil Plagioclases, Revisited: Implanted Solar Flare Noble Gases
Ph. Etique, P. Signer, R. Wieler 		  1094

Chemical Abundances, Cosmic Ray Production Rates and Exposure History of Soils from 74001/2
O. Eugster, W. Kiesl, N. Grogler, P. Eberhardt, J. Geiss 		  1095

Comparison of Spectral Reflectance Properties of Terrestrial and Martian Surfaces Determined from Landsat and Viking Orbiter Multispectral Images
D. L. Evans, J. B. Adams 		  1096

Very Fine Iron in Apollo 16 Soils: Observations and Some Theoretical Aspects of Magnetic Response
A. E. Fallick, C. T. Pillinger, A. Stephenson 		  1097

Variations in Thickness of Ganymede's Lithosphere Determined by Spacings of Lineations
J. H. Fink, R. C. Fletcher 		  1098

Olivine Barometry: Application to Pressure Estimation for Terrestrial and Lunar Rocks
A. A. Finnerty, S. M. Rigden 		  1099

14C Ages of Antarctic Meteorites and Ice and the Composition of the Air Trapped in the Ice
E. L. Fireman, T. Norris 		  1100

Carbon and CARBON-14 in Lunar Soil 14163
E. L. Fireman, R. W. Stoenner 		  1101

Granulometric and Chemical Compositions of Metallic Phase of Three Enstatite Chondrites
A. V. Fisenko, A. K. Lavrukhina, G. G. Ruchman 		  1102

Transmission Electron Microscopy of Clinoenstatite "whiskers" in Stratosphere-Collected Interplanetary Dust
P. Fraundorf 		  1103

Infrared Spectroscopy of Interplanetary Dust in the Laboratory
P. Fraundorf, J. J. Freeman, R. I. Patel 		  1104

Martian Pseudocraters: Searching the Northern Plains
H. Frey, M. Jarosewich 		  1105

Pseudocraters Near Hellas?
H. Frey, M. Jarosewich, K. Partridge 		  1106

Study of Solar Wind Gases in a Young Lunar Soil
U. Frick, R. O. Pepin 		  1107

Evidence from the ALUMINUM-26 Profile for Accretion of Apollo 15 Double Drive Tube 15010/15011
J. S. Fruchter, J. C. Evans, J. H. Reeves, R. W. Perkins 		  1108

Howardites: Samples of the Regolith of the Eucrite Parent-Body Petrology of Bholgati, Bununu, and Kapoeta
M. Fuhrman, J. J. Papike 		  1109

Vibrational Fracturing Rate: a New Strength Measure for Chondrites
N. Fujii, K. Ito, M. Miyamoto 		  1110

On the Interpretation of the NRM of Stably Magnetized Mare Basalts
M. Fuller, D. Clauter 		  1111

Characterization and Distribution of Pyroclastic Units in the Rima Bode Region of the Moon
L. R. Gaddis, J. B. Adams, B. R. Hawke, J. W. Head, T. B. McCord, C. M. Pieters, S. Zisk 		  1112

Distribution and Volumes of Lava Ponds in the Orientale Region of the Moon
L. R. Gaddis, J. W. Head 		  1113

Dust Cloud Observed in Venera 10 Panorama of Venusian Surface: Inferred Surface Processes
J. B. Garvin 		  1114

Rock Morphology of Basalts in the Western Desert of Egypt: Implications for Viking Lander Sites on Mars
J. B. Garvin, J. W. Head, F. El-Baz 		  1115

Tafoni in Basalt Boulders at South Point, Hawaii: Possible Analogs to Pitted Viking Lander Blocks on Mars
J. B. Garvin, P. J. Mouginis-Mark 		  1116

Some Phase Relations Involving Chromous Pyroxenes and Other CR2+ Bearing Phases at Pressures Less than 1 Atmosphere
T. Gasparik 		  1117

Luna 24: on the Nature of Mg-Rich Component
A. S. Gaverdovskaya, M. A. Nazarov, L. S. Tarasov 		  1118

Planetary Surface Analogs in the Dry Valleys, South Victoria Land, Antarctica
E. K. Gibson 		  1119

Soils and Weathering Processes in the Dry Valleys of Antarctica: Analogs of the Martian Regolith
E. K. Gibson, B. Ransom 		  1120

The Nickel-Iron Meteorite in Pyarloya (lithuania) Impact Rocks
L. I. Glasovskaya, G. Motuza, R. Gailius 		  1121

Density Constraints on the Composition of Venus
K. A. Goettel 		  1122

Mineralogical Changes during Terrestrial Weathering of Antarctic Chondrites
J. L. Gooding 		  1123

Estimated Viscosities and Implied Thermal Histories of Chondrule Droplets
J. L. Gooding, K. Keil 		  1124

Pre-Compaction Solar Flare Irradiation Records in Antarctic Meteorites
J. N. Goswami 		  1125

The Effects of Photometric Geometry on Spectral Reflectance: Color Light Curves of Asteroids
J. Gradie, J. Veverka 		  1126

Brent Crater, Ontario: Observation and Theory
R. A. F. Grieve, M. J. Cintala 		  1127

Petrology and Provenance of Apollo 15 Drill Core 15010/011
S. A. Griffiths, A. Basu, D. S. McKay, G. Nace 		  1128

The Origin of the REE Characteristics of Kreep: the Critical Role of Pigeonite
L. P. Gromet, P. C. Hess, M. J. Rutherford 		  1129

Compositional Study of Chondrules from the Highly Unequilibrated (LL3.0) Semarkona Chondrite
J. N. Grossman, J. T. Wasson 		  1130

Controls of Compositional Variation in Apollo 15 Green Glass
T. L. Grove 		  1131

Investigations of Pyroxferroite Stability in Lunar Basalts
T. L. Grove, D. H. Lindsley 		  1132

Prediction of Isotopic Fractionation Effects in Sputtered Minerals
P. K. Haff, C. C. Watson, T. A. Tombrello 		  1133

Are Basalts Adequate Probes to the Redox States of Planetary Mantles?
S. E. Haggerty 		  1134

Central Peaks in Martian Craters: Comparisons to the Moon and Mercury
W. Hale, J. W. Head 		  1135

Lunar Floor-Fractured Craters: Evidence for Viscous Relaxation of Crater Topography
J. L. Hall, S. C. Solomon, J. W. Head 		  1136

Inclusions in Minerals in Howardite Clasts: Indicators of Processed and Unprocessed Clasts in Unmodified Regolith Breccias
G. E. Harlow, J. S. Delaney 		  1137

Experimental Shock Metamorphism of Calcic Plagioclase
W. J. Harrison, F. Horz 		  1138

Velocity Distribution of Ejecta from Impacts Into Powdery Regoliths: Preliminary Experimental Results
W. K. Hartmann 		  1139

On the Occurrence of Giordano Bruno Ejecta on the Earth
J. B. Hartung 		  1140

An Interpretation of Lunar Surface Compositions Based on Chemical Modeling of Apollo Samples
L. A. Haskin, R. L. Korotev 		  1141

Some Observations on Compositional Characteristics of Lunar Anorthosites
L. A. Haskin, M. M. Lindstrom, P. A. Salpas 		  1142

Trace Element Characteristics of Some Massif-Type Anorthosites
L. A. Haskin, K. E. Seifert 		  1143

Spectral Studies of Lunar Dark-Halo Craters: Preliminary Results
B. R. Hawke, J. F. Bell 		  1144

Geochemical Studies of the Apollo Orbital Gamma-Ray Data for the Imbrium Basin and Adjacent Regions
B. R. Hawke, M. I. Etchegaray-Ramirez, E. L. Haines, A. E. Metzger 		  1145

High-Albedo Terrain on Ganymede: Origin as Flooded Graben
J. W. Head, M. L. Allison, E. M. Parmentier, S. Squyres 		  1146

Topography of the Orientale Basin
J. W. Head, E. Robinson, R. Phillips 		  1147

Impact Basins: Stages in Basin Formation and Evolution
J. W. Head, S. C. Solomon 		  1148

Lunar Sinuous Rille Formation by Thermal Erosion: Conditions, Rates and Durations
J. W. Head, L. Wilson 		  1149

Topography of Venus and Earth: a Test for the Presence of Plate Tectonics
J. W. Head, S. E. Yuter, S. C. Solomon 		  1150

Martian Fractured Terrain: Coalescing Polygons
P. Helfenstein 		  1151

Improved High Frequency Electromagnetic Sounding of the Lunar Mantle
F. Herbert, C. P. Sonett, L. D. Smith 		  1152

Density Constraints on Models of the Structure and Differentiation of the Terrestrial Planets
C. T. Herzberg 		  1153

Origin of Ti/sm Depletion in Mg-Rich Rocks and KREEP Basalts
P. C. Hess, M. J. Rutherford, L. P. Gromet 		  1154

Fractionation and Equilibration in Diogenites
R. H. Hewins 		  1155

Conditions of Formation of Pyroxene Excentroradial Chondrules
R. H. Hewins, L. C. Klein, B. V. Fasano 		  1156

Migration of Volatiles on the Lunar Surface
R. R. Hodges 		  1157

Sources of Lunar Magnetic Anomalies and Their Bulk Directions of Magnetization
L. L. Hood 		  1158

The Deep Lunar Electrical Conductivity Profile: an Experimental Limit on the Radius of a Metallic Core
L. L. Hood, C. P. Sonett, F. Herbert, S. Cantrell, L. Smith 		  1159

Rampart Craters on Ganymede: Implications for the Origin of Martian Rampart Craters
V. Horner, R. Greeley 		  1160

Variability of Clast Mode and Grain Size in Continuous Crater Deposits
F. Horz, R. Ostertag, D. A. Rainey 		  1161

Rare Gas Systematics on Venus, Earth, and Mars
C. J. Hostetler 		  1162

Asteroidal Regolith Depths: does the Mean Mean what you Think it Means?
K. R. Housen 		  1163

A Comparison of Current Asteroidal-Regolith Models
K. R. Housen 		  1164

Considerations Concerning the Weathering History and Sulfur Content of the Martian Regolith
R. M. Housley 		  1165

Oxidation of Allende Parent Material
R. M. Housley 		  1166

Assessment of Diffusion in Pyroxenes: what we do and do not Know
J. S. Huebner, G. L. Nord 		  1167

41K and 26MG in Allende Inclusions and a Hint of 41CA in the Early Solar System
J. C. Huneke, J. T. Armstrong, G. J. Wasserburg 		  1168

Rusty Rock Consortium Allocations: Petrographic Framework
R. H. Hunter, J. R. Garrison, L. A. Taylor 		  1169

The Mobility of Volatiles in Highland Rocks: Mineralogic Evidence
R. H. Hunter, L. A. Taylor 		  1170

MG Isotopes, Mineralogy and Mode of Formation of Secondary Phases in c3 Refractory Inclusions
I. D. Hutcheon, R. C. Newton 		  1171

Inversion, Decomposition and Exsolution Phenomena of Lunar Pyroxenes Observed in Breccia 73217
T. Ishii, S. Ghose, I. S. McCallum 		  1172

Temperature and Density in a Cloud of Material Vaporized by Meteorite Impact
B. A. Ivanov, P. F. Korotkov, D. A. Sudakov 		  1173

Sm-Nd Isotopic Systematics in Angra DOS Reis
S. B. Jacobsen, G. J. Wasserburg 		  1174

40AR-39AR Ages of Apollo 16 Coarse-Fines Fragments and the Age of Nectaris
O. B. James 		  1175

Tentative Classification of the Apollo 16 Breccias
O. B. James 		  1176

Multispectral Mosaics of the Galilean Satellites
T. V. Johnson, L. A. Soderblom, J. A. Mosher, G. E. Danielson, P. Kupferman 		  1177

Laboratory Trace Element Partitioning Studies Relevant to 244PU-RARE Earth Chronology
J. H. Jones, R. Heuser, D. S. Burnett, G. J. Fine 		  1178

Chlorine Correlated 36AR in Allende Fine-Grained Inclusions
J. Jordan 		  1179

Chlorine and Phosphorus-Bearing Phases in Lunar Samples: the Significance of CL/P2O5 Ratios: a Response
S. Jovanovic, G. W. Reed 		  1180

Insights Regarding Rusty Rock 66095 Based on Trace Element Studies: the Vapor Consortium
S. Jovanovic, G. W. Reed 		  1181

Mobility of Non-Gaseous Volatiles in the Lunar Regolith: 12027 Drive Tube Measurements
S. Jovanovic, G. W. Reed, J. L. Winkler, J. Warren 		  1182

What is the Origin of 107AG and 109AG in Nickel-Rich Ataxites?
T. Kaiser, G. J. Wasserburg 		  1183

Multielement Analytical Study of New and Unusual Carbonaceous Chondrites
G. W. Kallemeyn, J. T. Wasson 		  1184

Abundance of Uranium in the Ultramafic Inclusions from the Yakutia Kimberlite Pipes
L. L. Kashkarov, A. S. Pavlenko, G. V. Baryshnikova 		  1185

Compositions of Calcium, Aluminum-Rich Inclusions: Constraints on Models of Nebular Condensation
J. F. Kerridge 		  1186

Refinement of the Crystal Structure of Pigeonite in Intergrown Lunar Clinopyroxene 2438 (luna 24)
N. R. Khisina, E. L. Belokoneva, L. V. Petushkova, N. V. Belov 		  1187

Differentiation of Volatiles in the Planetary Formation and Evolution Processes
I. L. Khodakovsky 		  1188

The Thermodynamic Properties and Origin of Osbornite, Sinoite, Carlsbergite and Daubreelite in Meteorites
I. L. Khodakovsky, M. I. Petaev 		  1189

Global Maps of Martian Geophysical and Geologic Data
H. H. Kieffer 		  1190

Particulate Mineral Mixtures: the Relation of Albedo and Absorption Band Strength
T. V. V. King, C. M. Pieters, D. L. Sandlin 		  1191

Flow Behavior of Nine Iron-Containing Silicate Compositions
L. C. Klein, B. V. Fasano, J. M. Wu 		  1192

Classification of the Rock Samples of the Apollo 14 Landing Site According to the Recommended Nomenclature of Lunar Highland Rocks
H.-D. Knoll 		  1193

The Rock Samples at the Apollo 14 Site
H.-D. Knoll 		  1194

Degradation of Martian Escarpments: Backwasting and Debris Accumulation
R. C. Kochel, V. R. Baker 		  1195

Are Cai's Condensates or Distillation Residues? Evidence from a Comprehensive Survey of - to Medium-Grained Inclusions in the Allende C3(V) Carbonaceous Chondrite
A. S. Kornacki 		  1196

Compositional Trends in Apollo 16 Soils
R. L. Korotev 		  1197

Comparison of Geophysical Fields and Structures of the Earth and the Moon
E. D. Koryakin 		  1198

Winona Meteorite: Fission Track Ages, and PU and U Distributions
B. K. Kothari 		  1199

Spallation Reactions at the Poststellar Stage of Evolution of the Solar System Matter
R. I. Kuznetsova, A. K. Lavrukhina 		  1200

Extraterrestrial Siderophiles and Geologic Extinctions
F. T. Kyte, Z. Zhou, J. T. Wasson 		  1201

Shock Metamorphism: SEM Investigation
P. Lambert 		  1202

Comparative Shock Metamorphism Study in 12 Chondrites
P. Lambert, C. Lewis, C. B. Moore 		  1203

Primordial Thermal History of Growing Planetary Objects
P. Lanciano, C. Federico, A. Coradini 		  1204

Flow Processes in Lunar and Planetary Interiors
T. G. Langdon, A. Dehghan, C. G. Sammis 		  1205

Impact Experiments in Low-Temperature Ice
M. A. Lange, T. J. Ahrens 		  1206

Grain Size and Maturity in Lunar and Asteroidal Regoliths
Y. Langevin, M. Maurette 		  1207

Lunar Regolith: Comparative Chemistry of the Apollo and Luna Soils
J. C. Laul 		  1208

Chemical Composition of Allende Chondrite Olivine
A. K. Lavrukhina, N. N. Korotkova 		  1209

A MG Survey for More "fun" Isotopic Anomalies
T. Lee, M. L. Zeff 		  1210

Enstatite Chondrites i: Mineralogy and Petrography
C. A. Leitch, J. V. Smith 		  1211

Enstatite Chondrites II: Genesis
C. A. Leitch, J. V. Smith 		  1212

Argon and Xenon Adsorption on Mineral Surfaces: the Cosmochemical and Geochemical Consequences
L. K. Levsky, A. B. Verchovski, A. N. Chorev 		  1213

XE129 and the Origin of CCF Xenon in Meteorites
R. S. Lewis, E. Anders 		  1214

Geochemical Studies of Breccias from North Ray Crater, Apollo 16
M. M. Lindstrom, P. A. Salpas 		  1215

Highland Chemistry: Major and Trace Element Classification of Rock Types
K. J. Livi, S. O. Brande, A. E. Bence 		  1216

Modeling Equilibrium Partial Melting: Implications for Early Lunar Differentiation
J. Longhi 		  1217

Terrain Map of Europa
B. K. Lucchitta, L. A. Soderblom 		  1218

Electron Microscopy of Carbon in Allende Acid Residues
G. R. Lumpkin 		  1219

Analogous and Complementary Rare Earth Element Patterns on Meteorite Parent Bodies and the Earth Inferred from a Study of the Achondrite ALHA 77005, Other Unique Achondrites and the Shergottites
M.-S. Ma, J. C. Laul, R. A. Schmitt 		  1220

Chemistry of Individual Green Glasses and Brown Glasses from 15426
M.-S. Ma, Y.-G. Liu, R. A. Schmitt 		  1221

Chemical and Petrographic Study of Spinel Troctolite in 67435: Implications for the Origin of Mg-Rich Plutonic Rocks
M.-S. Ma, R. A. Schmitt, G. J. Taylor, R. D. Warner, K. Keil 		  1222

Refractory ABC
J. D. MacDougall, J. F. Kerridge, D. Phinney 		  1223

Clastic Rims on Inclusions: Clues to the Accretion of the Allende Parent Body
G. J. MacPherson, L. Grossman 		  1224

Origin of Rims on Coarse-Grained Inclusions in the Allende Meteorite
G. J. MacPherson, L. Grossman, J. R. Beckett, J. M. Allen 		  1225

C Chondrites: Low-Temperature Metamorphism
T. V. Malysheva, K. I. Tobelko, D. A. Khramov, T. P. Kuznezova, L. M. Satarova 		  1226

Apollo 16 Breccia 67015: First Observations on a Consortium Rock
U. B. Marvin 		  1227

High-Ferruginous Tagamites from the Terny Astrobleme (ukrainian Shield)
V. L. Masaitis, M. S. Mashchak, V. A. Ezersky 		  1228

Dynamics of Clastic Material Distribution in Allogenic Breccias and Suevites of the Kara Astrobleme
V. L. Masaitis, M. S. Mashchak, T. V. Selivanovskaya, V. A. Ezersky 		  1229

Venus: a First Geologic Map Based on Radar Altimetric and Image Data
H. Masursky, A. L. Dial, G. G. Schaber, M. E. Strobell 		  1230

Io's Atmosphere: Pressure Control by Subsurface Regolith Coldtrapping
D. L. Matson, D. B. Nash 		  1231

Conditions Required for Runaway Accretion of the Earth
T. Matsui 		  1232

The Balmer Basin: Identification of an Ancient Basin on the Lunar East Limb
T. A. Maxwell, C. G. Andre 		  1233

Ridge Patterns of Large Craters and Basins on Mars
T. A. Maxwell, A. W. Gifford 		  1234

Fractionation Trends in the Lunar Crust and the Stillwater Complex Trace Element Data
I. S. McCallum, L. D. Raedeke, H. Wiesmann 		  1235

Remote Detection of Olivine, Pyroxene and Plagioclase: Analysis of Three Lunar Sites
T. B. McCord, R. N. Clark, B. R. Hawke, L. A. McFadden, P. D. Owensby, C. M. Pieters, J. B. Adams 		  1236

Lunar Microcrater Records: where is the Cometary Efflux?
J. A. M. McDonnell, R. J. Allison 		  1237

The Layered Crust Model and the Surface of Vesta
L. A. McFadden, M. J. Gaffey, H. Takeda 		  1238

Petrography of Core 15008 and a Comparison to Core 15010/11
D. McKay, A. Basu, G. Nace 		  1239

The Origin of Apollo 16 Dimict Breccias
J. P. McKinley, G. J. Taylor, K. Keil, M.-S. Ma, R. A. Schmitt 		  1240

Tectonic Deformation of Galileo Regio and Limits to the Planetary Expansion of Ganymede
W. B. McKinnon, J. Spencer 		  1241

Bulk Compositional Variations, Viscosities, and the Effects of Oxidation and Sulfide Abundances on the Formation of Chondrules in the Allende Meteorite
B. M. McMahon, L. A. Tompkins, S. E. Haggerty 		  1242

Measurements of Xenon Diffusion in Feldspar
C. L. Melcher, D. S. Burnett, T. A. Tombrello 		  1243

A Bingham Plastic Model of Crater Collapse
H. J. Melosh 		  1244

Problems in Spectral Emittance Theory
W. W. Mendell 		  1245

Spectral REFLECTANCE(250-2500NM) of Powdered Samples of Olivines and Some Meteorites
M. Miyamoto, A. Mito, H. Takeda 		  1246

10BE in Stony Meteorites by Accelerator-Based Mass Spectrometry
R. K. Moniot, T. H. Kruse, W. Savin, G. S. Hall, T. Milazzo, G. F. Herzog 		  1247

Strangway's Crater: Trace Elements in Melt Rocks
J. W. Morgan, G. A. Wandless, R. K. Petrie 		  1248

Microstructures of Pyroxenes from Two Eucrites and a Lunar Monzodiorite
H. Mori, H. Takeda, R. Sadanaga 		  1249

On the Stability of Ferric Oxyhydroxides (feooh) to Dehydration by UV Radiation: Implications for the Hydration State of the Martian Surface
R. V. Morris, H. V.. Lauer 		  1250

Diffuse Reflectance Spectra of Pigmentary-Sized Iron Oxides, Iron Oxyhydroxides, and Their Mixtures: Implications for the Reflectance Spectra of Mars
R. V. Morris, S. C. Neely 		  1251

Late-Stage Summit Activity of Martian Volcanoes
P. J. Mouginis-Mark 		  1252

An Unusual Volcanic Center in Western Elysium Planitia, Mars
P. J. Mouginis-Mark, S. H. Brown 		  1253

Martian Large Crater and Basin Deposits: Implications for the Thickness of a Subsurface Volatile Layer and Site Geology at Viking Lander 2
P. J. Mouginis-Mark, B. R. Hawke 		  1254

Hypsometry of Martian Terrains from Earth-Based Radar Measurements
P. J. Mouginis-Mark, S. H. Zisk 		  1255

On the Mechanism of the Enrichment of the Venus Atmosphere with Noble Gases
L. M. Mukhin, M. V. Gerasimov 		  1256

Actinide Microdistributions in Enstatite Chondrites
M. T. Murrell, D. S. Burnett 		  1257

Rare-Earths in the Allende Inclusion, EK 1-4-1 and the Origin of Allende Inclusions
H. Nagasawa, D. P. Blanchard, H. Shimizu, A. Masuda 		  1258

The Composition of Natural Remanent Magnetization of an Antarctic Chondrite, ALHA76009(L6)
T. Nagata, M. Funaki 		  1259

Apollo 15 Green Glass: a Mare Margin Deposit
J. S. Nagle 		  1260

Solar and Galactic Cosmic Ray Records of Noble Gases in Lunar Rock 79215
C. M. Nautiyal, J. T. Padia, M. N. Rao, T. R. Venkatesan 		  1261

Luna 20: Modal Mineralogy of Highland Rocks
M. A. Nazarov 		  1262

The Luna 20 P-Rich Metal Particle: Bulk Composition and Trace Element Pattern
M. A. Nazarov, G. M. Kolesov, I. D. Shevaleevsky 		  1263

Cumberland Falls Chondritic Inclusions: a Primative Forsterite Chondrite Suite
C. W. Neal, M. E. Lipschutz 		  1264

Orthopyroxenite Clasts in Mesosiderites and Howardites: Relationships with Diogenites and Orthopyroxene Cumulate Eucrites
C. E. Nehru, J. S. Delaney, G. E. Harlow, S. Frishman, M. Prinz 		  1265

TI Isotopes in Allende Inclusions and Unequilibrated Chondrite Chondrules
S. Niemeyer, G. W. Lugmair 		  1266

Cosmogenic Nuclides in Antarctic Meteorites
K. Nishiizumi, J. R. Arnold 		  1267

53MN Profiles and Gardening Processes in Lunar Cores 60010 and 15011
K. Nishiizumi, J. R. Arnold 		  1268

Petrography of Feldspathic Fragmental Breccia 67016: Analog of Terrestrial Suevite?
M. D. Norman 		  1269

The Role of Salt in Aggregate Formation on Mars
D. Nummedal 		  1270

SR and nd Cooling Ages of Cumulate Norite 78236
L. E. Nyquist, W. U. Reimold, J. L. Wooden, B. M. Bansal, H. Weismann, C.-Y. Shih 		  1271

Impact Mechanics of the Cretaceous-Tertiary Extinction Bolide
J. D. O'Keefe, T. J. Ahrens 		  1272

How much Zenon in Shales?
L. L. Oliver, O. K. Manuel 		  1273

Silicate Inclusions in the Elga Octahedrite Ii: Shock Metamorphism
Eu. G. Osadchii 		  1274

Silicate Inclusions in the Elga Octahedrite i: Mineralogy and Structure
Eu. G. Osadchii, I. N. Romanenko, G. V. Baryshnikova 		  1275

Tungsten and Some Other Siderophile Elements in Meteoritic and Terrestrial Basalts
H. Palme, W. Rammensee 		  1276

Interpretation of Phase Curves of io and Ganymede: Nature of Surface Particles
K. D. Pang, K. A. Lumme, E. Bowell 		  1277

Microchrons: the 87RB-87SR Dating of Microscopic Samples
D. A. Papanastassiou, G. J. Wasserburg 		  1278

The Lunar Regolith: Significance of the Chemistry of the <10 um Fraction and a Model for Agglutinate Formation Involving Fusion of the Finest Fraction (F3)
J. J. Papike 		  1279

The Lunar Regolith: Calculated Chemistry and Major Element Partitioning among the Regolith Components
J. J. Papike, C. White 		  1280

Potassium Concentrations in the Lunar Surface
R. E. Parker, E. L. Haines, A. E. Metzger 		  1281

Viscous Degradation of Impact Craters on Icy Planetary Surfaces: Viscosity Variation with Depth
E. M. Parmentier, J. W. Head 		  1282

Regional Variation of Crater Density and Model Ages of Callisto's Crust
Q. R. Passey, E. M. Shoemaker 		  1283

The Hafnium Isotopic Evolution of Lunar Basalts
P. J. Patchett, M. Tatsumoto 		  1284

Lu/hf in Chondrites and Definition of a Chondritic Hafnium Growth Curve
P. J. Patchett, M. Tatsumoto 		  1285

Early Thermal Histories of L Chondrites
P. Pellas 		  1286

Hebes Chasma - Martian Pyroclastic Sink
C. M. Peterson 		  1287

Implications of Archean Anorthosites for Crust-Mantle Evolution
W. C. Phinney, D. A. Morrison, L. D. Ashwal 		  1288

Copernicus' Peak: Possible Cumulate Olivine
C. M. Pieters, J. B. Adams, T. B. McCord 		  1289

Multispectral Images for Core 15008: a Stratigraphic Tool
C. M. Pieters, A. Meloy, B. R. Hawke, J. S. Nagle 		  1290

Crater Depths on Mars: New Data from Viking Photogrammetry
R. J. Pike 		  1291

Meteorite Craters: Rim Height, Circularity, and Gravity Anomalies
R. J. Pike 		  1292

Target-Dependence of Crater Depth on the Moon
R. J. Pike 		  1293

The Role of Adsorption in the Excess Fission xe Effect
F. A. Podosek, T. J. Bernatowicz, F. E. Kramer, C. M. Hohenberg 		  1294

The Effect of Shock on Remanence in Multi-Domain Iron Grains and Implications for Palaeointensity Measurements
J. Pohl, A. Eckstaller 		  1295

Observations of Silicate Reststrahlen Bands in Lunar Infrared Spectra
A. E. Potter, T. H. Morgan 		  1296

A Reexamination of the Evidence in Lunar Sample 12013 for Highly Fractionated Rocks at 4.5 AE
J. E. Quick, A. L. Albee 		  1297

Chilling Products of Superheated Impact Melts from Some Astroblemes of the U.S.S.R. Territory
A. I. Raikhlin, A. N. Danilin, V. S. Kozlov, N. B. Reshetnyak 		  1298

Evidence for 244PU Fission Tracks in Hibonites from Murchison Carbonaceous Chondrite
R. S. Rajan, A. S. Tamhane 		  1299

The Nebular Record in Krymka, a Highly Unequilibrated LL Chondrite
E. R. Rambaldi 		  1300

Lunar Isotopic Variations: Reflections of Changes in Solar Wind Composition or Flow?
J. Ray, D. Heymann 		  1301

Cosmic-Ray Stable Nuclides: Various Production Rates and Their Implications
R. C. Reedy 		  1302

A Structural Analysis of Valhalla Basin, Callisto
A. R. Remsberg 		  1303

Apollo 11 Breccias: Aluminous Mare Basalts or Multi-Component Mixtures?
J. M. Rhodes, D. P. Blanchard 		  1304

Chemistry of Some Antarctic Meteorites
J. M. Rhodes, C. R. Fulton 		  1305

Phenomenological Theory of Attenuation and Propagation Velocity of Elastic Waves in Rocks
J. M. Richardson, B. R. Tittmann, M. Abdel-Gawad 		  1306

Impact Vaporization and Lunar Origin
S. M. Rigden, T. J. Ahrens 		  1307

Siderophile Elements in Mare Basalts Revisited
A. E. Ringwood, S. E. Kesson 		  1308

Rhenium Depletion in Mare Basalts and Redox State of the Lunar Interior
A. E. Ringwood, S. E. Kesson, W. Hibberson 		  1309

Haughton Impact Structure - a Terrestrial Multi-Ring Basin?
P. B. Robertson, J. F. Sweeney, R. A. F. Grieve 		  1310

Comparisons of Field Observations, Experimental Results, and Numerical Code Calculations for Large-Scale Impact and Explosion Cratering Events: Meteor Crater and Middle Gust III
D. J. Roddy, K. Kreyenhagen, S. Schuster 		  1311

A Survey of Compositions of Clear Glass Particles in Apollo 16 Soils, and the Source of Clear Glasses in the Lunar Regolith
H. R. Rogers 		  1312

Equilibrium Conditions in a Terra and a Mare Region
L. B. Ronca, A. T. Basilevsky, V. P. Kryuchkov, B. A. Ivanov 		  1313

Radar Altimetry of the Large Martian Craters
L. E. Roth, G. S. Downs, R. S. Saunders, G. Schubert 		  1314

A New Kind of Unequilibrated Ordinary Chondrite with a - Magnetite Matrix
A. E. Rubin, S. McKinley, E. R. D. Scott, G. J. Taylor, K. Keil 		  1315

Implications of Lunar Palaeomagnetism
S. K. Runcorn, D. W. Collinson, A. Stephenson 		  1316

Magnetic Evidence for a Lunar Core
C. T. Russell, P. J. Coleman, B. E. Goldstein 		  1317

Granite Genesis in a Planetary Context: Processes and Important Variables for Mars
M. J. Rutherford, P. C. Hess 		  1318

The Apollo 17 Highlands: the South Massif Soils
G. Ryder 		  1319

On the Gravitational Field of PHOBOS
M. U. Sagitov, B. O. Mikhailov, Kh. G. Tadjidinov 		  1320

The Ridged Plains of Mars
R. S. Saunders, T. G. Bills, L. Johanson 		  1321

Planetary Phase Equilibria at 600 and 800K
S. K. Saxena 		  1322

Large-Scale Equatorial and Mid-Latitude Surface Disruptions on Venus: Preliminary Geologic Assessment
G. G. Schaber, H. Masursky 		  1323

39AR-40AR Study of Allan Hills Meteorite 77005, a Unique Achondrite
O. A. Schaeffer, R. Warasila 		  1324

An Experimental Investigation of Transient Crater Size
R. M. Schmidt, K. A. Holsapple 		  1325

High Spatial Resolution Mg/al Maps of the Western Crisium and Sulpicius Gallus Regions
E. Schonfeld 		  1326

Uranium Redox Equilibria in Interaction with Chromium in Molten Silicates
H. D. Schreiber, G. B. Balazs 		  1327

The Chemistry of Uranium in Synthetic Silicate Liquids
H. D. Schreiber, G. B. Balazs, B. J. Williams 		  1328

Equatorial Paleo-Poles on Mars
P. H. Schultz, A. B. Lutz-Garihan 		  1329

Impact Crater Growth and Ejecta Characteristics: Results from Computer Simulations
P. H. Schultz, D. L. Orphal, B. Miller, W. F. Borden, S. A. Larson 		  1330

Mars: a Highland Volcanic Province
D. H. Scott, K. L. Tanaka 		  1331

Graphite - Magnetite Inclusions in Ordinary Chondrites: an Important Constituent in the Early Solar System
E. R. D. Scott, G. J. Taylor, A. E. Rubin, A. Okada, K. Keil, B. Hudson, C. M. Hohenberg 		  1332

Dark Inclusions in the Abbott, Cynthiana and Abee Chondrites
D. W. Sears, J. T. Wasson 		  1333

The Origin of Mare Ridges: Evidence from Basalt Stratigraphy and Substructure in Mare Serenitatis
V. L. Sharpton, J. W. Head 		  1334

Subsurface Basalt Stratigraphy of Mare Serenitatis
V. L. Sharpton, J. W. Head 		  1335

Sm-Nd and Rb-Sr Isotopic Systematics of Australasian Tektites
H. F. Shaw, G. J. Wasserburg 		  1336

Assessment of Ferric Iron Oxide Minerals Likely to Occur on Mars
D. M. Sherman, R. G. Burns, V. M. Burns 		  1337

REE, SR and nd Isotopic Studies on Shocked Achondrites-Shergotty Zagami and ALHA 77005
C.-Y. Shih, L. E. Nyquist, B. M. Bansal, H. Wiesmann, J. L. Wooden, G. McKay 		  1338

U-Isotopic Abundances
T. Shimamura, G. W. Lugmair 		  1339

The Importance of Magma Density in the Evolution of KREEP
D. N. Shirley 		  1340

An Attempt at Mapping the Parameter of Surface Microporosity of Lunar Regolith: Correlation Between Albedo and Polarization Properties of the Moon
Yu. G. Shkuratov, A. T. Basilevsky 		  1341

The Lunar Regolith: Comparative Petrology of the Apollo and Luna Soils
S. B. Simon, J. J. Papike 		  1342

The Lunar Regolith: Petrology of Three Apollo 17 Surface Soils
S. B. Simon, J. J. Papike 		  1343

Apollo 14 Regolith Breccia 14301: Petrology and Chemistry of Grain Size Separates and the Nature of the Fused Soil Component
S. B. Simon, J. J. Papike, J. C. Laul 		  1344

Petrochemistry of Apollo 16 and 17 Samples
C. H. Simonds, J. L. Warner 		  1345

Spectral Constraints on Iron-Rich Smectites as Abundant Constituents of Martian Soils
R. B. Singer 		  1346

Spectral Variety of Martian Surface Materials: Comparison of Earth-Based and Viking Lander Data
R. B. Singer, E. L. Strickland 		  1347

Should Enstatite Chondrites BE Considered when Modeling the Chemical Composition of the Earth?
J. V. Smith 		  1348

Was a Hydrous and Carbonated Magma Present on the Moon?
J. V. Smith 		  1349

Eucritic and Al-Rich Clasts in the Kapoeta Howardite: Chemical Data
M. R. Smith, R. A. Schmitt 		  1350

Petrogenesis of Continental Flood Basalts from the Siberian Platform and a Model of Mantle Evolution
M. R. Smith, R. A. Schmitt 		  1351

Preliminary Chemical Data for Some Allan Hills Polymict Eucrites
M. R. Smith, R. A. Schmitt 		  1352

Carbynes in Carbonaceous Chondrites: a Cautionary Comment
P. P. K. Smith, P. R. Buseck 		  1353

The Effect of Crystallization of Ice on Cometary Outbursts
R. Smoluchowski 		  1354

The Evolution of Multi-Ringed Basins: Viscoelastic Relaxation of Topographic Relief
S. C. Solomon, J. W. Head 		  1355

Cosmogenic Nuclide Production in Small Spherical Meteoroids
M. S. Spergel, R. C. Reedy, O. W. Lazareth, P. W. Levy 		  1356

Chemical Mixing Model Studies of Lunar Orbital Geochemical Data: Apollo 16 and 17 Highlands Compositions
P. D. Spudis, B. R. Hawke 		  1357

Origin of Grooves on Ganymede
S. W. Squyres, E. M. Parmentier, J. W. Head 		  1358

Ion Probe Analysis of Stillwater Plagioclase and Comparison with Lunar Analyses
I. M. Steele, J. V. Smith, L. D. Raedeke, I. S. McCallum 		  1359

Ion Probe Analysis of Plagioclase in Eucrites and Howardites
I. M. Steele, J. V. Smith, J. Wyszynski 		  1360

The Behavior of Water in the Giant Planets
D. J. Stevenson, E. Fishbein 		  1361

A Fluid Outer Core for the Moon and its Implications for Lunar Dissipation, Free Librations and Magnetism
D. J. Stevenson, C. F. Yoder 		  1362

Distribution and Provenance of Rock Types from North Ray Crater, Apollo 16
D. Stoffler, R. Ostertag, W. U. Reimold 		  1363

Experimental Study of the Crystallization Sequences of Ca-Al Inclusions in Allende
E. Stolper 		  1364

Furrowed and Pitted Terrain on the Lunar East Side: X-Ray Fluorescence Data
P. L. Strain, F. El-Baz 		  1365

Cratering Records of Ganymede and Callisto
R. G. Strom, A. Woronow, M. C. Gurnis 		  1366

Magnetic Properties of Antarctic Meteorite AH77304
N. Sugiura, D. W. Strangway 		  1367

Preliminary Report on the Magnetic Properties of the Abee Meteorite
N. Sugiura, D. W. Strangway 		  1368

Natural Radioactivity of the Moon and Planets
Yu. A. Surkov 		  1369

On Dilatancy of Rocks by Explosive Effects
N. M. Syrnikov, V. M. Tsvetkov, I. A. Sisov 		  1370

Thermal and Impact Histories of Pyroxenes in Lunar Eucritic Gabbros and Eucrites
H. Takeda, H. Mori, T. Ishii, M. Miyamoto 		  1371

Yamato Polymict Eucrites: Regolith Breccias Excavated from a Layered Crust
H. Takeda, K. Yanai 		  1372

A Model for Synthesis of Methane in Lunar Soil
A. S. Tamhane 		  1373

The Occurrence and Implications of Carbide-Magnetite Assemblages in Unequilibrated Ordinary Chondrites
G. J. Taylor, A. Okada, E. R. D. Scott, A. E. Rubin, G. R. Huss, K. Keil 		  1374

- and Phosphorus-Bearing Phases in Lunar Samples: the Significance of CL/P2O5 Ratios
L. A. Taylor, R. H. Hunter 		  1375

Chlorine and Sulfur Abundances in Mars and the Moon: Implications for Bulk Composition
S. R. Taylor, R. R. Hodges 		  1376

Concerning Pb-U in Chondrites
F. Tera 		  1377

Congruency of Conformable Galenas - Age of the Earth
F. Tera 		  1378

Young Lunar Crater Ejecta Characteristics from Radar, Infrared and Visual Observations
T. W. Thompson, J. A. Cutts, P. H. Schultz, R. W. Shorthill, S. H. Zisk 		  1379

Frequency Dependence of Seismic Dissipation Q-1
B. R. Tittmann, M. Abdel-Gawad, C. Salvado, J. Bulau, H. Nadler, L. Ahlberg, T. W. Spencer 		  1380

Tidal Triggering of Earthquakes
M. N. Toksoz, D. S. Sawyer, C. H. Cheng 		  1381

Sweeping of Jovian Commensurability Resonances in the Early Solar System and the Origin and Evolution of the Asteroids
M. Torbett, R. Smoluchowski 		  1382

Support of Topographic and Other Loads on the Moon and Mars
D. L. Turcotte, R. J. Willemann 		  1383

Simplified Model Evaluation of Cooling Rates for Glass-Containing Lunar Compositions
D. R. Uhlmann, H. Yinnon, C.-Y. Fang 		  1384

The Vaporization of the Basaltic Melt in Vacuum at the Constant Temperature: Experimental Results
A. A. Ulyanov, O. I. Yakovlev, M. A. Nazarov, E. J. Sherbovsky 		  1385

U-Pb Study of l3 Chondrites: Old Ages or Young Disturbances?
D. M. Unruh, M. Tatsumoto, R. Hutchinson 		  1386

Compositional Characteristics of Solar Wind and Solar Flare Neon in the Past Using Lunar Soils and Rocks
T. R. Venkatesan, C. M. Nautiyal, J. T. Padia, M. N. Rao 		  1387

The Allende Pink Angel: Chronological Constraints from xe, ar, and MG
I. M. Villa, J. C. Huneke, D. A. Papanastassiou, G. J. Wasserburg 		  1388

A Study of Crater Morphology in Volatile-Containing Rock
J. Vizgirda, T. J. Ahrens 		  1389

Rare Gas Systematics in Abee Clasts
J. Wacker, K. Marti 		  1390

Micrometeorites and Possible Cometary Dust from Antarctic Ice Cores
J. Wagstaff, E. A. King 		  1391

Drainage in Gobi Terrain: a Mars Analog
A. S. Walker 		  1392

Soret Separation of Lunar Liquid
D. Walker, C. E. Lesher, J. F. Hays 		  1393

The Apollo 15 Regolith: Comparative Petrology of Cores 15003 and 15010/ 15011 and an Assessment of the Nature of the Agglutinate Component
R. J. Walker, J. J. Papike 		  1394

Multielement Analysis of Samples from Highland Breccia 66095: a Contribution to the "rusty Rock" Consortium
H. Wanke, K. Blum, G. Dreibus, H. Palme, B. Spettel 		  1395

Chemistry of the Earth and the Significance of Primary and Secondary Objects for the Formation of Planets and Meteorite Parent Bodies
H. Wanke, E. Dreibus, G. Jagoutz, H. Palme, W. Rammensee 		  1396

An Estimate of Atmospheric Contamination of Allende Coarse Grain Inclusions
R. Warasila, O. A. Schaeffer, K. Frank 		  1397

Alteration and Metasomatism of Allende Ca-Al Materials
D. A. Wark 		  1398

The Pre-Alteration Compositions of Allende Ca-Al Condensates
D. A. Wark 		  1399

Similarities in the Igneous Development of the Feldspathic Crust of Earth and Moon
J. L. Warner 		  1400

Additional Pristine Nonmare Rocks from the Western Hemisphere of the Moon - Implications for Petrogenetic Models
P. H. Warren, G. J. Taylor, K. Keil, C. Marshall, J. T. Wasson 		  1401

Possible Experimental Verification of the Butler-Banerjee Prediction: no Stable Single Domain Size Range for Iron Spheres
P. J. Wasilewski 		  1402

Magnetic Properties of Ordering Alloys in Meteorites
P. J. Wasilewski, C. Saralkar 		  1403

Stable NRM and Mineralogy in Allende: Chondrules
P. J. Wasilewski, C. Saralkar 		  1404

Characteristics of a Sputter-Induced Atmosphere on IO
C. C. Watson, P. K. Haff, T. A. Tombrello 		  1405

Effect of Partitioning in Determining the Composition of Planetary Mantles
J. P. Watt, T. J. Ahrens 		  1406

Aspects of Accretion in a Circumplanetary Nebula
S. J. Weidenschilling 		  1407

Impact Accretion Experiments
V. Werle, H. Fechtig, E. Schneider 		  1408

Can One Find Tranquility in the Lunar Highlands?
G. W. Wetherill 		  1409

Characteristics of Lunar Extra-Mare Basaltic Volcanism
J. L. Whitford-Stark 		  1410

Lunar Basalt Distribution and the Number of Vents
J. L. Whitford-Stark 		  1411

On the Source of Liquid H2O in the Carbonaceous Chondrite Parent Bodies
L. L. Wilkening 		  1412

The Revision of Metallographic Cooling Rate Curves for Chondrites
J. Willis, J. I. Goldstein 		  1413

Io Volcanic Eruptions: Mass Eruption Rate Estimates
L. Wilson, J. W. Head 		  1414

Volcanic Eruption Mechanisms on Mars: Some Theoretical Constraints
L. Wilson, J. W. Head 		  1415

Meteorites from Mars: Prospects, Problems and Implications
C. A. Wood, L. D. Ashwal 		  1416

On the Nature of the Pallasite Parent Body: Midcourse Corrections
J. A. Wood 		  1417

Chemical and Isotopic Studies of the Allan Hills Polymict Eucrites
J. Wooden, A. Reid, R. Brown, B. Bansal, H. Wiesmann, L. Nyquist 		  1418

Proton-Probe Analysis of Planetary Materials
D. S. Woolum, P. Boisseau 		  1419

Bi, pb, CR and Si-Rich Metals in Hallingeberg (L3)
D. S. Woolu, J. Conca, D. S. Burnett 		  1420

Water Content of Rampart Ejecta Deposits from Pre-Flow Stresses
A. Woronow 		  1421

Cratering Record in the Inner Solar System
A. Woronow, R. Strom, M. C. Gurnis 		  1422

New Global Topographic Mapping of the Moon
S. S. C. Wu 		  1423

Single Crystal Investigation of Deformation in Naturally Shocked Quartz - a Restudy
X. Xiande, E. C. T. Chao 		  1424

The Selective Condensation of Vapor Enriched with Alkalies and its Implication to the Ultrapotassium Impactites: Experimental Results
O. I. Yakovlev, O. V. Parfenova, K. I. Ignatenko 		  1425

Isotopic Ratios of Rare Gases and the Role of Nuclear Reactions in Solar Flares
A. Yaniv, T. Kirsten 		  1426

Porosity of Ordinary Chondrite -- is it a Good Measure of a Consolidation State of Composite Materials of Chondrite?
K. Yomogida, T. Matsui 		  1427

High Resolution Visual, Thermal, and Radar Observations in the Northern Syrtis Major Region of Mars
J. Zimbelman, R. Greeley 		  1428

Simulated Mantled Surfaces on Cratered Terrain
J. Zimbelman, R. Greeley 		  1429

Characterization of Martian Geological Units by Multivariate ("cluster") Analysis of Earth-Based Radar Data
S. H. Zisk, P. J. Mouginis-Mark 		  1430

Oases Revisited: Further Analysis of the SOLIS Lacus Radar Anomaly on Mars
S. H. Zisk, P. J. Mouginis-Mark 		  1431

On a New Model for the Generation of Chondrites
H. A. Zook 		  1432