Monday, July 22, 1996 OPENING REMARKS/PLENARY 8:30 a.m. Audimax Chair(s): D. Stoffler McSween H. Y. Jr.* The Role of Meteoritics in Space Flight Missions, and Vice Versa Marvin U. B.* Ernst F. F. Chladni (1756-1827) and the Founding of Meteoritics Monday, July 22, 1996 METEORITES: GENERAL DEBATE 11:15 a.m. Audimax Chair(s): A. Bischoff Pillinger C. T.* Pillinger J. M The Value of Publicity--The Wold Cottage Chondrite, Edward Topham, and the Foundation of Meteoritics Franchi I. A.* Bland P. A. Jull A. J. T. Cloudt S. Berry F. J. Pillinger C. T. An Assessment of the Meteorite Recovery Potential of SE Arabia from Meteorite Weathering Patterns Corrigan C. M.* Zolensky M. E. Long M. Weir J. Comparison of Porosity and Permeability in Chondritic Materials Kuoppamaki K. Kivekas L. Timonen J. Hartikainen J. Hartikainen K. Pesonen L. J.* Determination of Porosity of Meteorites--Comparison of Two Methods Consolmagno SJ G. J.* Britt D. T. Density and Porosity Measurements of the Vatican Meteorite Collection Monday, July 22, 1996 ASTEROIDS AND METEORITE FLUX 11:15 a.m. Kinosaal Chair(s): C. R. Chapman M. E. Lipschutz Nolan M. C.* Orbital Evolution of Very-Near-Earth Asteroids Burbine T. H.* Binzel R. P. Bus S. J. Sunshine J. M. Spectroscopy of Near-Earth Asteroids: New Results Gaffey M. J.* Spectral Identification of Asteroid 6 Hebe as the Mainbelt Parent Body of the H-type Ordinary Chondrites Ryan E. V. Chapman C. R.* Spectral Variations on Ida: A Space Weathering Trend? Monday, July 22, 1996 ACHONDRITES 1:45 p.m. Audimax Chair(s): D. Mittlefehldt J. Zipfel Kallemeyn G. W.* Pontlyfni: Not Just Another Winonaite Zipfel J.* Shukolyukov A. Lugmair G. W. Mn-Cr Systematics in the Acapulco Meteorite Nyquist L. E.* Bogard D. Wiesmann H. Shih C.-Y. Yamaguchi A. Takeda H. Early History of the Padvarninkai Eucrite Galer S. J. G.* Lugmair G. W. Lead Isotope Systematics of Noncumulate Eucrites Shukolyukov A.* Lugmair G. W. 60Fe-60Ni Isotope System in the Eucrite Caldera Mittlefehldt D. W.* Lindstrom M. M. Antarctic Stannern and Nuevo Laredo Trend Eucrites, Cumulates, and Others Crozaz G.* Hsu W. Perils of Partition Revisited Holzheid A.* Palme H. The Formation of Eucrites as Partial Melts from an H-Chondrite Source: Constraints from New Metal-Silicate Partition Coefficients Takahashi K.* Kagi H. Masuda A. Chemical and Isotopic Characteristics for Several Ureilites Chikami J.* Mikouchi T. Miyamoto M. Takeda H. Ureilite Formation Process with Regard to LEW 88774 Ureilite Warren P. H.* Ureilite Origin by 'Smelting': A Conceptual Pitfall McCoy T. J.* A Pyroxene-Oldhamite Clast in Bustee: Igneous Aubritic Oldhamite and the Ti Enrichment in Aubritic Troilite Monday, July 22, 1996 IMPACT PROCESSING OF ASTEROIDS 1:45 p.m. Kinosaal Chair(s): A. El Goresy K. Keil Keil K.* Stoffler D. Love S. G. Scott E. R. D. Constraints on the Role of Impact Heating and Melting in Asteroids Nishiizumi K.* Caffee M. W. Nagai H. Imamura M. Multiple Breakup of ALH 85085-like and CR Group Chondrites Scott E. R. D.* Haack H. Love S. G. Formation of Mesosiderites by Fragmentation and Reaccretion of a Large Differentiated Asteroid Grier J. A.* Swindle T. D. Kring D. A. The Impact Evolution of L-Chondrite Parent Body Material Jackel A.* Bischoff A. Mineralogy of Brecciated LL Chondrites: Information for Parent Body Processes Romstedt J.* Jackel A. Two Generations of Lithified Regolith in the LL-Chondritic Regolith Breccia Acfer 066 Wopenka B.* Chen M. El Goresy A. Microsampling Raman Spectroscopy: A Nifty Technique for the Unambiguous In Situ Identification of Micrometer-sized Shock-induced Polymorphs in L6 Chondrites Sharp T. G.* Chen M. El Goresy A. Microstructures of High-Pressure Minerals in Shocked Chondrites: Constraints on the Duration of Shock Events Schmitt R. T.* Langenhorst F. Planar Deformation Features in Olivine from Experimentally Shocked H6 Chondrite Kernouve Badjukov D. D.* Nazarov M. A. Brandstatter F. Kurat G. Kozlov E. A. Zhugin Yu. N. Rusakov V. S. An Experimental Shock Melting of the Saratov Chondrite Nakajima T. Nakamura N.* Nagao K. Kagami H. Kitamura M. Yamazaki F. Misawa K. Rb-Sr and K-Ar Systematics and Petrographic Characteristics of the Y 790746 Shocked H Chondrite Takaoka N.* Nakamura T. Nagao K. Trapped Noble Gases in Vesicles Formed by Impact Melting Monday, July 22, 1996 Asteroids and Meteorite Flux 5:30 p.m. Audimax Robinson M. Bell J. F. III Chapman C. Cheng A. Gold R. Malin M. McFadden L. Murchie S. Thomas P. Veverka J. Warren J. Near MSI and NIS: Alive and Well Molau S. Oberst J. Schindler M. Computer-based Analysis of All-Sky Meteor Images Obtained by the 'European Fireball Network' Rivkin A. S. Davies J. K. Johnson J. R. Lebofsky L. A. High-Resolution Spectra of Hydrated Asteroids in the Three-micrometer Region Howell E. S. Rivkin A. S. Lebofsky L. A. S-Class Asteroid Spectral Trends with Size and Dynamical Population Stork R. Solc M. Models of Dust Temperatures in Atmospheres of ISO Target Comets Moroz L. V. Fisenko A. V. Semjonova L. F. Pieters C. M. Korotaeva N. N. Where Are the Ordinary Chondrite Parent Bodies? Meteorites: General Debate Niedermann S. The Isotopic Composition of Neon in the Earth's Upper and Lower Mantle--New Constraints from East Pacific Rise MORB Glasses Czegka W. The Contributions of Alfred Wegener to Meteoritics and Early Impact Research Bischoff A. Weber D. Meteorites from Libya: Old and New Finds Nagahara H. Ozawa K. Evaporation Kinetics of Silicate Melt Robinson M. S. Lucey P. G. Color and Albedo of Mercury Britt D. T. Consolmagno SJ G. J. Estimating Porosities from Bulk Densities Petry C. Palme H. Chakraborty S. Ni Content of Olivine in Oxidized Meteorites as Indicator of Thermal History--A Preliminary Report Heide K. Stelzner Th. Weber D. Bischoff A. The Puna Desert--A New Potential Meteorite Recovery Area Weber H. W. Schultz L. Noble Gases in Two R Chondrites Chondrules Biryukov V. V. Ulyanov A. A. Mineralogy and Origin of Chondrules in Antarctic CR2 Chondrite PCA91082 Weinbruch S. Buttner H. Rosenhauer M. Hewins R. H. On the Lower Limit of Chondrule Cooling Rates Kimura M. Ikeda Y. Comparative Study on Alteration Processes of Chondrules in Oxidized and Reduced CV Chondrites Hanowski N. P. Brearley A. J. Alteration Reactions in Chondrules of the CM Chondrite, LEW 90500 Sanders I. S. Significance of Ancient 'Impact-Melt Rocks' for the Origin of Chondrules C Chondrites Krol E. Lang B. Magnetic Hysteresis Parameters for Y 791717 and Y 82050 Carbonaceous Chondrites Weckwerth G. Classification of Volatility-dependent Fractionation Trends in C4 Chondrites: Support from Recent Data of C4 Meteorite Loongana Floss C. Palme H. Spettel B. Zinner E. El Goresy A. Rammensee W. Loss of Moderately Volatile Elements During Evaporation of the Allende CV Chondrite Weisberg M. K. Prinz M. Zolensky M. E. Clayton R. N. Mayeda T. K. Ebihara M. Ningqiang and Its Relationship to Oxidized CV3 Chondrites Wang M.-S. Lipschutz M. E. Volatile Trace Elements in Kaidun, A Polymict Breccia from Hell Buchanan P. C. Zolensky M. E. Reid A. M. Petrology of Allende Dark Inclusions Brazzle R. H. Davis A. M. MacPherson G. J. Hohenberg C. M. I-Xe Studies of Sodalite-rich Inclusions from Allende CAIs Takeda H. Kojima H. Hibonite-rich Inclusion from Yamato 86751 CV3 Chondrite Ordinary Chondrites/E Chondrites Otto J. Loeken Th. Weber H. W. Schultz L. Gao, Guenie, Souma--One, Two, or Three Falls? Scorzelli R. B. Petrick S. Krot A. N. 57Fe Mossbauer Studies of Carbide-Magnetite-bearing Type-3 Ordinary Chondrites Terho M. Pesonen L. J. Weathering and Shock on Magnetic Properties of H5 Chondrites Bland P. A. Sexton A. S. Berry F. J. Pillinger C. T. Chemical Analyses of Weathered Ordinary Chondrites Pedrazzi G. Ortalli I. Galvao da Silva E. Scorzelli R. B. Tetrataenite in Metal Particles of the Trenzano Meteorite Identified by Mossbauer Spectroscopy Stepniewski M. Radlicz K. Siemiatkowski J. Borucki J. Preliminary Study of the L Chondrite Baszkowka (Poland) Semenenko V. P. New Data on a Carbonaceous Clast in the Krymka Chondrite Sipiera P. P. Kawachi Y. Dod B. D. Willcox Playa and Ryan Field: Two Arizona Chondrites from the James M. DuPont Collection Impact Processing of Asteroids Chen M. Wopenka B. El Goresy A. Sharp T. G. High-Pressure Assemblages in Shock Melt Veins in the Peace River (L6) Chondrite: Compositions and Pressure-Temperature History Presolar Grains in Primitive Solar System Materials Dorschner J. Henning Th. Jager C. Mutschke H. Ott U. Spectrum and Solid-State Structure of Murchison Diamonds Burki P. R. Leutwyler S. Matsui Y. Sato Y. Homogeneous Nucleation of Diamond Particles at Atmospheric Pressure Afanassiev S. V. Simakin S. G. Fainberg V. S. Mg Isotope Fractionation in the E2 CAI Type A from the Efremovka CV3 Chondrite Pillinger C. T. Verchovsky A. B. Carbon and Argon Release from Presolar Diamonds by Pyrolysis in the Atmosphere of Hydrogen Ash R. D. Russell S. S. Newton J. Arden J. W. Pillinger C. T. C-theta--A 'Presolar' Grain Formed in the Laboratory Sahoo S. K. Masuda A. Evidence for Isotopic Heterogeneity of Zirconium in Nature: Preterrestrial Records Solar Nebula and Isotopes Busemann H. Baur H. Wieler R. Determination of Noble Gas Component 'Q' in an Hf/HCl Residue of the Lance Meteorite by Closed-System Stepped Etching Goswami J. N. Marhas K. K. Sahijpal S. Short-lived Nuclides in the Early Solar System: The Possible Role of an Active Early Sun Zhai M. Nakamura E. Shaw D. M. Nakano T. Boron Isotopic Ratios of Meteorites and Lunar Rocks Maynard J. Franchi I. A. Morgan G. H. Wright I. P. Pillinger C. T. The Oxygen Isotopic Composition of Primitive Water in Meteorites--A New Approach Rooke G. P. Franchi I. A. Verchovsky A. Grady M. M. Pillinger C. T. Heavy Nitrogen and Noble Gases in the Bencubbin Breccia Automatically Revisited Murty S. V. S. Nitrogen Components in the Dhajala Meteorite Lauretta D. S. Lodders K. A New Look at Beryllium and Boron Condensation Cosmogenic Nuclides and Exposure History Pellas P. Fieni C. Spallation Tracks in Merrillites of Ordinary Chondrites Honda M. Nagai H. Nagao K. Miura Y. N. Cosmogenic Nuclides in the Brenham Pallasite Michel R. Busemann H. Gloris M. Klug B. Krins A. Leya I. Neumann S. Reinhardt H. Herpers U. Schiekel Th. Sudbrock F. Holmqvist B. Conde H. Malmborg P. Suter M. Kubik P.-W. Synal H.-A. Thin-Target Cross Sections for the Production of Cosmogenic Nuclides by Proton- and Alpha-induced Reactions Gilabert E. Lavielle B. Schiekel Th. Herpers U. Neumann S. Leya I. Michel R. Measurements and Modeling the Production of Kr and Xe in a Simulation Experiment of an Artificial Iron Meteoroid Masarik J. Reedy R. C. Production of Cosmogenic Nuclides in Meteoroids of Various Shapes Nishiizumi K. Caffee M. W. Jeannot J.-P. Lavielle B. A Systematic Study of the Cosmic-Ray-Exposure History of Iron Meteorites: New Radionuclide Results Yoneda S. Shima M. Komura K. Nagao K. Okada A. Kita N. T. Togashi S. Okuyama Y. Bunno M. A New Meteorite Shower, Tsukuba: Detection of 24Na and the Exposure History Tuesday, July 23, 1996 ORGANIC MATTER IN METEORITES AND COSMIC DUST 8:30 a.m. Audimax Chair(s): R. D. Ash T. Stephan Barber S. Franchi I. A. Kent B. J. Maynard J. Miller M. F. Morgan G. M. Morse A. D. Sheridan S. Wright I. P. Pillinger C. T.* The MODULUS Experiment: The Link Between Light Elements in Meteorites and Comets Ash R. D.* Pillinger C. T. A Review of Organic Material in CR Chondrites Alexander C. M. O'D.* Arden J. W. Ash R. D. Grady M. M. Russell S. S. Pillinger C. T. The C and N Isotopic Compositions of Insoluble Organic Matter in Chondrites Cronin J. R.* Pizzarello S. Enantiomeric Analyses of Chiral Compounds from the Murchison Meteorite Wright I. P.* Yates P. D. Pillinger C. T. The Effects of Atmospheric Heating on the Carbon in Micrometeorites Bajt S. Chapman H. N. Flynn G. J.* Keller L. P. Carbon XANES Evidence for C60 in Interplanetary Dust Particles Stephan T.* Jessberger E. K. Keller L. P. Flynn G. J. Bajt S. Chapman H. N. Fullerenes in Interplanetary Dust? Becker L.* Bada J. L. Poreda R. J. Extraterrestrial Helium Trapped in Fullerenes in the Sudbury Impact Structure Choi Y.* Yang J. Adsorption and Stepwise-Heating Release of Hydrogen Isotopes in the Acid Residues of Bituminous Coal and Oil Shale Korochantsev A. V.* Nikolaeva O. V. Study of Meteoritic Organics Through Natural Bitumens: A New Approach Tuesday, July 23, 1996 CHONDRULES 8:30 a.m. Kinosaal Chair(s): H. C. Connolly Jr. J. N. Grossman Hutchison R.* Grady M. M. Origin of Chondrules in Leighton, A Gas-rich H-Group Chondrite Lofgren G. E.* Chondrule Precursor Aggregates in UOCs Grossman J. N.* Zoning of Mesostatis in FeO-poor Semarkona Chondrules Deloule E.* Robert F. Origins of Water in the Solar System: Ion Probe Determinations of D/H Ratios in Chondrules Hanon P.* Chaussidon M. Robert F. The Redox State of the Solar Nebula: C and H Concentrations in Chondrules Connolly H. C. Jr.* Carbon, Nebular Gas, and Reduced Chondrule Formation: An Experimental Investigation Yu Y.* Hewins R. H. Reduction, Volatile Loss, and Chondrule Formation Tuesday, July 23, 1996 C CHONDRITES 10:30 a.m. Kinosaal Chair(s): R. H. Jones H. Palme Krot A. N.* Zolensky M. E. Scott E. R. D. Keil K. Asteroidal Formation of Ca-Fe-Mg Silicates in Allende Dark Inclusions, Allende Host, and Other Oxidized CV3 Chondrites Browning L.* Bourcier W. Fluid Conditions During the Alteration of CM Chondrites Brearley A. J.* A Comparison of FeO-rich Olivines in Chondrules, Matrix, and Dark Inclusions in Allende and the Discovery of Phyllosilicate Veins in Chondrule Enstatite Weisberg M. K.* Prinz M. Ebihara M. Fayalitic Olivine in CV3 Chondrites Jones R. H.* Hutcheon I. D. Mineralogy and Secondary Alteration of a Complex Plagioclase-rich Inclusion in Kainsaz Wolf D. Spettel B. Nazarov M. El Goresy A. Palme H.* Incomplete Sampling of Metal in the CV Chondrite Efremovka Brandstatter F.* Ivanov A. V. Kurat G. An Ordinary Chondrite Fragment (R3) in the Kaidun Carbonaceous Chondrite Schirmeyer S.* Bischoff A. Stephan T. Jessberg E. K. Lithium Distribution Within the Carbonaceous Chondrites Lance (CO3) and Allende (CV3): Preliminary Results Hiyagon H.* An Ion Microprobe Study of Oxygen Isotopes in Allende Olivines Clayton R. N.* Mayeda T. K. Oxygen Isotope Relations Among CO, CK, and CM Chondrites and Carbonaceous Chondrite Dark Inclusions Ichikawa O.* Kojima H. Degree of Aqueous Alteration of Chondrules in Yamato 790112 CR Chondrite Tuesday, July 23, 1996 MICROMETEORITES AND IDPs 11:15 a.m. Audimax Chair(s): J. P. Bradley G. J. Flynn Kurat G.* Hoppe P. Engrand C. A Chondrule Micrometeorite from Antarctica with Vapor-Fractionated Trace-Element Abundances Genge M. J.* Grady M. M. Hutchison R. Parent Body Associations of Fine-Grained Antarctic Micrometorites Graham G. A.* Wright I. P. Grady M. M. Perreau M. Maurette M. Pillinger C. T. The Carbon Stable Isotopic Composition of Antarctic Micrometeorites Arndt P.* Jessberger E. K. Warren J. Zolensky M. Bromine Contamination of IDPs During Collection Flynn G. J.* Sutton S. R. Bajt S. Chemical Compositions of Cluster IDPs By XRF Microprobe Rietmeijer F. J. M.* A Test of Isochemical Behavior of Principal Components in Chondritic Porous IDPs Bradley J. P.* Compositional Mapping of Interplanetary Dust Particles with Nanometer-Scale Spatial Resolution Engrand C.* Deloule E. Kurat G. Maurette M. Trace-Element Contents of Antarctic Cosmic Spherules and Their COPS Nuggets Rost D.* Stephan T. Jessberger E. K. Surface Analysis of Stratospheric Dust Particles with TOF-SIMS: New Results Leya I.* Lange H.-J. Michel R. Meltzow B. Herpers U. Sudbrock F. Busemann H. Wieler R. Dittrich-Hannen B. Suter M. Kubik P. W. Model Calculations for the Production of Cosmogenic Nuclides in Stony and Iron Meteoroids by Galactic Cosmic-Ray Particles Karner J. M.* Rietmeijer F. J. M. Janeczek J. AEM, XRD, and IR Analyses of an AlSiO Condensate Annealed for Two Hours at Room Temperature Up To 1100 Degrees C Tuesday, July 23, 1996 CAIs 2:45 p.m. Kinosaal Chair(s): A. Greshake L. Grossman Wood J. A.* Why Did Some CAIs Contain 26Al and Others Not? Srinivasan G.* Huss G. R. Wasserburg G. J. 26Al Timescales and Processes Connecting Plagioclase-rich Chondrules and CAIs Russell S. S.* Huss G. R. Wassergurg G. J. MacPherson G. J. Plagioclase-rich Inclusions from the Coolidge Meteorite: A Distinct CAI Population with No Evidence for Radiogenic 26Mg Sahijpal S. Goswami J. N.* Davis A. M. Grossman L. Lewis R. S. K and Mg Isotopic Studies of CM Hibonites McKeegan K. D.* Leshin L. A. Russell S. S. MacPherson G. J. In Situ Measurement of Oxygen Isotopic Anomalies in a Type B Allende CAI Greshake A.* Bischoff A. Putnis A. Palme H. Occurrence of Oxides in Minerals of Ca, Al-rich Inclusions from Carbonaceous Chondrites: Al2O3 (Corundum), TiO2 (Rutile), MgO (Periclase), and CaO Simon S. B.* Grossman L. On the Origin of Palisade Bodies Found in Refractory Inclusions in CV3 Chondrites Weber D.* Petrography of Refractory Inclusions from the CR Chondrite Acfer 059-El Djouf 001 and Relationship to Other Inclusion Populations Fogel R. A.* Experimental Formation of Nitrogen-rich Hibonite, Corundum, and Silicates: Possible Nebular Condensates Under Reducing Conditions Tuesday, July 23, 1996 ACCRETION OF PLANETARY BODIES 3:30 p.m. Audimax Chair(s): M. J. Drake Morfill * Invited Talk. Wetherill G. W.* Formation of the Asteroids Choi B.-G.* Wasson J. T. Episodic Accretion of Solar Nebula: Meteoritic Clues Righter K. Drake M. J.* Accretion and Core Formation in the Earth Kong P.* Ebihara M. Compositional Continuity of Enstatite Chondrites and Implications for Heterogeneous Accretion of the Enstatite Chondrite Parent Body Ghosh A.* McSween H. Y. Jr. Accretionary Heating is Actually Cooling: Why Asteroids Larger Than 4 Vesta Did Not Melt Tuesday, July 23, 1996 POSTER SESSION Organic Matter in Meteorites and Cosmic Dust 5:30 - 7:30 p.m. Audimax Brandenburg J. E. Mars as the Parent Body of the CI Carbonaceous Chondrites: A Further Examination Solc M. Vetesnik M. 10-micrometer Infrared Features of C- and Si-rich Compounds Produced in a High-Frequency Plasma Discharge Pavlov A. A. Pavlov A. K. Sputtering of Atmospheres Under Accretion of the Interplanetary Dust and Origin of the Noble Gases in Planetary Atmospheres Korochantsev A. V. Badjukov D. D. Moroz L. V. Pieters C. M. Galuzinskaja A. Kh. Laboratory Impact-induced Modification of Organic Material: Preliminary Results Micrometeorites and IDPs Harvey R. P. Taylor S. Zolensky M. E. Preliminary Characterization of South Pole Water Well Micrometeorites Rietmeijer F. J. M. Flynn G. J. Lower Stratospheric Abundances of Aluminum Oxide and Al'-Spheres >9 micrometers from May 22, 1981, to July 1991. Klock W. Are All Chondritic Porous IDPs of Cometary Origin? Flynn G. J. Collisions in the Kuiper Belt and the Production of Interplanetary Dust Particles Engrand C. Deloule E. Maurette M. Kurat G. Robert F. Water Content of COPS-rich Cosmic Spherules from Antarctica Biermann U. M. Presper T. Koop T. Mossinger J. Crutzen P. J. Peter Th. The Unsuitability of Meteoritic and Other Nuclei for Polar Stratospheric Cloud Freezing Arndt P. Maetz M. Reimold D. Wallianos A. Jessberger E. K. Mass and Multielement Analyses of Interplanetary Dust Particles with PIXE and STIM at the Heidelberg Proton Microprobe Genge M. J. Hutchison R. Grady M. M. Atmospheric Alteration of Coarse-Grained Antarctic Micrometeorites Messenger S. Keller L. P. Thomas K. L. Walker R. M. Nitrogen Petrography in Two 15N-rich IDPs Borg J. Bibring J.-P. Bunch T. Nishioka K. Ryder J. T. Vassent B. Westphal A. Preliminary Results of the COMRADE-ESEF Experiment Achondrites Bukovanska M. Ireland T. R. Janicke J. Ion Probe Dating of Some Baddeleyites in Antarctic Basaltic Achondrites Fioretti A. M. Molin G. Brandstatter F. Kurat G. Schreibersite, Metal, and Troilite in Ureilites FRO 90054 and FRO 93008 Zema M. Pasqual D. Domeneghetti M. C. Molin G. Takeda H. Cooling History of Gibson Lodranite Deduced from Fe2+-Mg Ordering in Clino- and Orthopyroxenes Zema M. Domeneghetti M. C. Molin G. Tazzoli V. Thermal History of Diogenites Constrained by Fe2+-Mg Ordering in Orthopyroxene Takeda H. Ishii T. Miyamoto M. Coarsely Exsolved Pyroxenes in a Eucrite from Antarctica and the Highest Degree of Crustal Metamorphism SNCs Bishop J. L. Pieters C. M. Spectral Analysis of the Martian Meteorite ALH 84001 Wasch R. Schade U. Infrared Spectroscopy of Lithologically Different Areas of a Piece of the Zagami Meteorite Zbik M. Gostin V. A. Comparison Between Elemental Ratios in Fusion Crusts and Minerals of Lunar and Martian Meteorites Mittlefehldt D. W. Lindstrom D. J. Lindstrom M. M. Martian Alteration Effects on Bulk Compositions of Martian Meteorites Dreibus G. Spettel B. Wlotzka F. Schultz L. Weber H. W. Jochum K. P. Wanke H. QUE94201: An Unusual Martian Basalt Iron Meteorites, Pallasites, and Mesosiderites Tertichnaya B. V. Semenenko V. P. Mineralogy of the Ancient Ataxite Chinga (IVB-Anom) Marvin U. B. Petaev M. I. Kempton R. Drusy Vugs in the Albion Iron Meteorite: Mineralogy and Textures Skala R. Fryda J. Primary Chlorine-bearing Inclusion in Meteoritic Iron? Desrousseaux A. Doukhan J. C. Fieni C. Perron C. Jeannot J. P. Lavielle B. Renaud D. Van Duysen J. C. Caffee M. Nishiizumi K. A New Iron Meteorite from France Impact Craters and Ejecta Bell M. S. Sharpton V. L. High-Pressure Shock Effects in Silica in St. Peter Sandstone from the Kentland Impact Structure, Indiana, USA Albin E. F. Norman M. D. Roden M. F. Geochemistry of Georgia Tektites: Evidence for a Compositionally Diverse Source Henkel H. Rheologic Hysteresis of Large Impact Structures as Seen in Reflection Seismic and Electric Resitivity Data Henkel H. Lilljequist R. The Uppland Structure: A Suspected 300-km-Diameter Impact Crater in Sweden Henkel H. Tiirmaa R. Fleetwood A. Blomqvist G. Tor--A Postglacial Impact Crater in NW Harjedalen, Sweden Marin L. E. Sharpton V. L. Results of Shallow Drilling on the Southern Inner Flank of the Chicxulub Impact Basin: Implications for Basin Size Czegka W. Remarks on the Morasko Crater Field and Some of Its Lost Morphological Features Tiirmaa R. Czegka W. The Kaali-Crater Field at Saaremaa (Osel), Estonia: Geological Investigations Since 1827 and Future Perspectives Lindstrom M. Sturkell E. F. F. Ormo J. Tornberg R. The Lockne Marine Impact in the Ordovician of Central Sweden Clark T. M. Evans B. J. Senftle F. Investigation of Reports of High Ferric/Ferrous Ratios in Tektites Skala R. Rietveld Crystal Structure Refinement of Quartz from the Meteor Crater, Arizona de Jong R. C. Reimold W. U. The Tswaing Crater Museum: Developing the Pretoria Saltpan Impact Crater into an Enviro-Museum Impact Flux and Extinction on Earth Artem'eva N. A. Shuvalov V. V. Trubetskaya I. A. Interaction of Fragments after Meteoroid Disruption: Process and Consequences Popova O. P. Nemtchinov I. V. Sikhote-Alin Iron Shower and Its Comparison with the February 1, 1994 Event Popova O. P. Nemtchinov I. V. Estimates of PN Bolide Characteristics Based on the Light Curves Oberst J. Gritzner C. Schindler M. Molau S. Neukum G. Heinlein D. Rendtel J. Spurny P. Ceplecha Z. Fechtig H. The 'European Fireball Network': Current Status Masaitis V. L. Balmasov E. L. Projectile Matter in the Impactites of Puchezh-Katunki Crater: Preliminary Data Puura V. Plado J. Kirsimae K. Kivisilla J. Kleesment A. Niin M. Geological, Geochemical, Mineralogical, Geophysical, and Petrophysical Studies for Structural Modeling of the Kardla Crater, Estonia Langenhorst F. Claeys P. Study of Impact Ni-rich Magnesioferrite Spinels Under TEM Gurov E. P. Gurova E. P. Rakitskaya R. B. Impact Diamonds of the Zapadnaya Crater: Phase Composition and Some Properties Tiirmaa R. Raukas A. Searching for Extraterrestrial and Explosion Material Around the Kaali Craters (Saaremaa Island, Estonia) and the Time of Impact Wednesday, July 24, 1996 LEONARD MEDAL LECTURE 8:30 a.m. Audimax Chair(s): H. Y. McSween Jr. Brownlee D.* Leonard Medal Talk Wednesday, July 24, 1996 ORDINARY CHONDRITES/E CHONDRITES 9:00 a.m. Audimax Chair(s): A. E. Rubin K. C. Welten Wight M. J. Wright I. P.* Grady M. M. Pillinger C. T. Carbonate Minerals in Parnallee and Implications for Its Alteration History Semenenko V. P.* Girich A. L. Graphite-containing Fragments in the Krymka Chondrite Brazzle R. H.* Hohenberg C. M. Xe and Kr Studies of Neutron-irradiated Phosphate and Feldspar Separates from Ordinary Chondrites Saxton J. M.* Lyon I. C. Turner G. 16O-rich Olivine in the Julesburg Ordinary Chondrite Wasson J. T.* Zito K. L. Ulff-Moller F. Matrix Composition and Flow in Ordinary Chondrites Wolf S. F.* Lipschutz M. E. Equilibrated H Chondrite Composition Lauretta D. S.* Lodders K. Kremser D. T. An Experimental Study of Sulfur Mobilization During Metamorphism of Ordinary Chondrite Parent Bodies Welten K. C.* Lindner L. van der Borg K. Anten P. Verdurme E. A Quantitative Weathering Classification of Antarctic H and L Chondrites Stelzner Th.* Heide K. Loeken Th. Schultz L. Depth Profiles of Weathering Effects in Three H5 Chondrites from the Acfer Region (Algerian Sahara) Bland P. A.* Franchi I. A. Sexton A. S. Berry F. J. Pillinger C. T. The Oxygen Isotopic Composition of Weathered Ordinary Chondrites from the Nullarbor Region Rubin A. E.* An Enstatite Chondrite from the Moon Taunton A. Benoit P. H. Sears D. W. G.* Size Sorting of Chondrules in EL Chondrites: Implications for the Origin of Enstatite Chondrites Wednesday, July 24, 1996 SNC METEORITES 9:00 a.m. Kinosaal Chair(s): G. Dreibus M. M. Grady Yanai K.* Martian Meteorites: An Attempt Reclassification Based on Their Compositions, Lithologies, and Ages Mikouchi T.* Miyamoto M. Comparative Mineralogy of Antarctic Lherzolitic Shergottites Allan Hills 77005, Lewis Cliff 88516, and Yamato 793605 Jull A. J. T.* Cloudt S. Eastoe C. J. The 14C and Stable Isotopic Composition of Carbonates in SNC Meteorites Grady M. M.* Verchovsky A. Wright I. P. Pillinger C. T. Fully Automated Stepped Combustion Analysis of Carbon, Nitrogen, and Argon in QUE 94201: Comparison with Other Shergottites Turner G.* Whitby J. A. Gilmour J. D. Xenon Isotopes in Individual Minerals in Nakhla: Implications for the Noble Gas Budget of Mars Leshin L. A.* Harvey R. P. McCoy T. J. McKeegan K. D. Water in Apatite from Shergottite QUE94201: Abundance and D/H Borg L. E.* Nyquist L. E. Wiesmann H. Shih C.-Y. Rb-Sr Age and Initial 87Sr/86Sr of Basaltic Shergottite QUE 94201 Gilmour J. D.* Whitby J. A. Turner G. Carrier Phases of Xenon in ALH84001 Wadhwa M.* Lugmair G. W. The Formation Age of Carbonates in ALH84001 Ott U.* Lohr H.-P. Begemann F. Etching and Crushing SNCs: More Noble Gas Data Klingelhofer G.* Fegley B. Jr. Held P. Osborne R. Mossbauer Studies of Basalt Oxidation in Simulated Martian Atmospheres Thursday, July 25, 1996 IMPACT FLUX AND MASS EXTINCTION ON EARTH 8:30 a.m. Audimax Chair(s): P. C. Buchanan F. T. Kyte Smit J.* Invited Presentation. Claeys P.* Alvarez W. Smit J. Montanari A. Shocked (?) Limestone Fragments--A New Component of the Proximal Impact Ejecta of the Chicxulub Crater Kyte F. T.* Should We Expect to Find More Pieces of the KT Bolide? Sharpton V. L.* Corrigan C. M. Limitations to Using Scaling Laws for Constraining the KT Source Crater Schuraytz B. C.* Lindstrom D. J. Sharpton V. L. Iridium Carriers Within the KT-Age Chicxulub Impact Crater Gersonde R.* Kyte F. T. Abelmann A. Bleil U. Bostwick J. Diekmann B. Flores J. A. Gohl K. Kuhn G. The 2.5-Ma Impact into the Deep Southern Ocean: Its Imprint on Sediment Structures and Paleoenvironmental Implications Grieve R. A. F.* Deutsch A. Therriault A. M. Ostermann M. The Sudbury Igneous Complex: Basic Arguments for an Impact Origin Elston W. E.* Proposed Bushveld-Vredefort Multiple Megaimpacts: Possible Correlation with Global 2.1-2.0-Ga Events and the Proterophytic-Paleophytic Boundary Buchanan P. C.* Reimold W. U. Stratigraphic and Microstructural Constraints on the Origin of the Bushveld Complex, South Africa Neukum G.* Ivanov B. A. The Size-Frequency Distribution of Impact Craters in the Inner Solar System and Implications for Past and Recent Cratering Rates in the Earth-Moon System Taylor S.* Lever J. H. Harvey R. P. Terrestrial Flux Rates of Micrometeorites Determined from the South Pole Water Well Golub' A. P. Kosarev I. B. Nemtchinov I. V.* Popova O. P. Spectra of Radiation Emitted by Large Meteoroids Kracher A.* Bishop M. A. Asteroids, Extinctions, and the Impact of Philosophy Thursday, July 25, 1996 PRESOLAR GRAINS IN PRIMITIVE SOLAR SYSTEM MATERIALS 8:30 a.m. Kinosaal Chair(s): G. R. Huss P. Hoppe Ott U.* Interstellar Grains: Some Facts, Implications, and Ideas Huss G. R.* Wasserburg G. J. Unresolved Issues in the Interpretation of Isotopic Data from Presolar SiC Amari S.* Zinner E. Lewis R. S. A Presolar Graphite Grain with Unusual Isotopic Compositions Hoppe P.* Kocher T. A. Eberhardt P. Amari S. Lewis R. S. Variations of 44Ti in Circumstellar SiC Grains of Type X Amari S. Nittler L. R. Zinner E.* Lewis R. S. High-Mass-Resolution Ion Imaging of 12C/13C Ratios: Identification of Rare Types of Presolar SiC from Murchison Strebel R.* Hoppe P. Eberhardt P. A Circumstellar Al- and Mg-rich Oxide Grain from the Orgueil Meteorite Podosek F. A.* Gao X. Nichols R. H. Ott U. Specht S. Brannon J. C. Bernatowicz T. J. Throughly Anomalous CR in Carbonaceous Chondrites Gao X.* Amari S. Messenger S. Nittler L. R. Swan P. D. Walker R. M. Survey of Circumstellar Grains in the Unique Carbonaceous Chondrite Acfer 094 Hill H. G. M.* d'Hendecourt L. B. Perron C. Can Any Infrared Absorption Bands be Linked to Microdiamonds Chaussidon M. Robert F.* Boron and Lithium Isotope Variations in Chondrules: The Signature of Presolar Nucleosynthesis Burki P. R.* Low-Pressure Formation Routes for Interstellar Microdiamonds: Chemical Vapor Deposition vs. Homogeneous Nucleation Nittler L. R.* Cowsik R. Presolar Al2O3 Grains as Probes of Galactic Chemical Evolution and the Age of the Galaxy Thursday, July 25, 1996 IMPACT CRATERS AND EJECTA I 1:30 p.m. Audimax Chair(s): A. Deutsch V. L. Masaitis Schrand C.* Deutsch A. Phase Transformations in Preheated Granitic Rock Samples in Shock Recovery Experiments at 85 GP: Formation of Shock-generated Crystals Abbott J. I.* Hough R. M. Gilmour I. Pillinger C. T. Impact Diamonds in Glass from Otting Quarry, Ries Crater, Germany Langenhorst F.* Masaitis V. L. Microstructural Characteristics of Impact Diamonds from the Popigai Crater, Russia Valter A. A.* Yerjomenko G. K. Carbon Minerals in Rock of Astroblemes See T. H.* Wagstaff J. Yang V. Horz F. McKay G. Small-scale Compositional Heterogeneity of Impact Melts Koeberl C.* Reimold W. U. Lake Bosumtwi, Ghana, Impact Structure: Petrography and Geochemistry of Target Rocks Puura V.* Kirsimae K. Kivisilla J. Plado J. Puura I. Suuroja K. Geochemical Anomalies of Terrestrial Compounds in Nonmelted Impactites at Kardla, Estonia Deutsch A.* Ostermann M. Masaitis V. L. Nd-Sr Isotope Systematics of Impact-related Glassy Objects (Urengoites, South-Ural Glass, Zhamanshinites, Irghizites) Holker Th.* Deutsch A. Sr and Nd Isotopic Compositions of Impact Melt Rocks from the Boltysh and Lappajarvi Impact Structures Dressler B. O.* Weiser T. Brockmeyer P. Recrystallized Glasses and Other Melts of the Onaping Formation and the Origin of the Sudbury Igneous Complex, Ontario, Canada Ostermann M.* Deutsch A. Therriault A. M. Grieve R. A. F. The Sudbury Impact Structure: Geochemistry of the Drill Cores 70011 and 52848 ('Igneous' Complex) Therriault A. M.* Grieve R. A. F. Ostermann M. Deutsch A. Sudbury Igneous Complex: How Many Melt Systems? Thursday, July 26, 1996 SOLAR NEBULA AND ISOTOPES 1:30 p.m. Kinosaal Chair(s): J.-L. Birck G. J. MacPherson Lee T.* Shu F. H. Glassgold A. Shang H. An X-Wind Scenario for Early Solar System Irradiation Meyer B. S.* Extinct Radioactivities and the R Process Murty S. V. S.* Wasserburg G. J. Search for Extinct 36Cl in a Halogen-rich Chondrule of Allende MacPherson G. J.* Zinner E. K. Grossman J. N. Plagioclase-rich Chondrules in the Ungrouped E3 Chondrite LEW 87234: Trace Elements, and a Suggestion of Excess 26Mg Mostefaoui S. Zinner E. Perron C.* Isotopic Composition of C and N in Metal-Associated Graphite from the Bishunpur L3 Chondrite Cyr K. E.* Sears W. D. Lunine J. I. The Distribution of Water Vapor and Ice in the Solar Nebula Ruzmaikina T. V.* Accretional Shock Processing of Dust Aggregates in the Inner Solar Nebula Ebel D. S.* Grossman L. Limiting Conditions for Silicate Liquid Stability in Cosmic Gases Pepin R. O.* Comparison of Noble Gas Isotopic Compositions in the Solar Wind and in Primordial Planetary Reservoirs as Inferred from Models of Atmospheric Evolution by Hydrodynamic Escape Ozima M.* Wieler R. Marty B. Podosek F. A. Comparative Studies of Solar, Q, and Terrestrial Noble Gases, and Their Implication for the Evolution of the Solar Nebula Mostefaoui S.* Zinner E. Perron C. Large 15N Excesses in Graphite from the Khohar L3 Chondrite Birck J. L.* Allegre C. J. Re-Os Isotopes in Meteorites Friday, July 26, 1996 COSMOGENIC NUCLIDES AND EXPOSURE HISTORY 9:00 a.m. Audimax Chair(s): R. Michel T. D. Swindle Mokos J. L. Lipschutz M. E.* A Peculiar Group of H4-6 Chondrites from the Allan Hills, Antarctica Swindle T. D.* Lippse R. Scott I. Are There Meteorite Streams? Investigations of a Possible Basaltic Achondrite Stream Nagao K.* Miura Y. N. Sugiura N. Time-dependent Variation of Eucrite Influx to the Earth: An Inference from Exposure and Terrestrial Ages of Antarctic and Non-Antarctic Meteorites Merchel S.* Herpers U. Faestermann T. Knie K. Korschinek G. Schmidt C. Kubik P. W. Suter M. Neumann S. Michel R. Exposure History of Stony and Iron Meteorites: Determination of 10Be, 26Al, and 53Mn Via Accelerator Mass Spectrometry (AMS) Neumann S.* Borges L. Leya I. Michel R. Deciphering Long-Term Averaged Solar Cosmic-Ray Characteristics by Cosmogenic Nuclides Masarik J.* Reedy R. C. Monte Carlo Simulations of Cosmogenic Nuclide Production by Solar Cosmic Rays Weigel A.* Neumann S. Eugster O. Michel R. Evidence for Solar-Cosmic-Ray-Produced Nuclides in Acapulcoites and Lodranites: New Data on Acapulco, ALH 81187, ALH 84190, and LEW 86220 Bonino G.* Cini Castagnoli G. Bhandari N. Taricco C. 44Ti in the Cereseto Meteorite: Evidence for the Dalton Solar Minimum Modulation of Galactic Cosmic Rays Herrmann S. Scherer P.* Schultz L. Noble Gases in 20 Saharan LL Chondrites: Exposure Ages and Possible Pairing Polnau E.* Eugster O. Thalmann Ch. Weigel A. Marti K. Noble Gas Exposure Ages of Some Selected Chondrites Jeannot J.-P.* Lavielle B. Marti K. A Systematic Study of the Cosmic-Ray-Exposure History of Iron Meteorites: New, Precise He, Ne, and Ar Results Miura Y. N.* Nagao K. Noble Gases in Chondrules of the Allende CV3 Chondrite Friday, July 26, 1996 IRON METEORITES, PALLASITES, AND MESOSIDERITES 9:00 a.m. Kinosaal Chair(s): D. A. Papanastassiou F. Ulff-Moller Smoliar M. I.* Walker R. J. The First Pt-Os Isochron: Definition of the 190Pt Decay Constant Mathew K. J. Marti K.* Zipfel J. Disequilibrium Signatures and 129I-129Xe Chronology in El Taco (IAB) Iron Meteorite Sugiura N.* Carbon and Nitrogen in Iron Meteorites Ebihara M.* Kong P. Ikeda Y. Kojima H. Y 791093: An Anomalous IIE Iron Yang C.-W. Williams D. B. Goldstein J. I.* Taenite Decomposition in Meteoritic Metal at Low Temperatures (<400 degrees C) Shen J. J. Papanastassiou D. A.* Wasserburg G. J. Rhenium-Osmium in Pallasite and Mesosiderite Metal Petaev M. I.* Marvin U. B. Drusy Vugs in the Albion Iron Meteorite: Early Speculations on the Origin Chabot N. L.* Drake M. J. Formation of Magmatic Iron Meteorites by Fractional Crystallization with Metallic Magma Mixing Ulff-Moller F.* Liquid Immiscibility in Magmatic Iron Meteorite Parent Bodies Davis A. M.* Olsen E. J. REE Patterns in Pallasite Phosphates--A Window on Mantle Differentiation in Parent Bodies Leroux H.* Desrousseaux A. Doukhan J. C. An ATEM Investigation of Fe-Ni Alloys in Meteorites Skala R.* Fryda J. Site Occupancies in Schreibersite from the Vicenice Iron: Rietveld Crystal Structure Refinement Friday, July 26, 1996 BARRINGER MEDAL TALK 1:30 p.m. Audimax Chair(s): H. Y. McSween Jr. Horz F.* Cintala M. J. Impact Experiments Related to the Evolution of Planetary Regoliths Friday, July 26, 1996 IMPACT CRATERS AND EJECTA II 2:00 p.m. Audimax Chair(s): P. Claeys W. U. Reimold Pesonen L. J.* Jarvela J. Sarapaa O. Pietarinen H. The Iso-Naakkima Meteorite Impact Structure: Physical Properties and Paleomagnetism of a Drill Core Henkel H.* Reimold W. U. Geophysical Modeling and Reconstruction of the Vredefort Impact Structure, South Africa Reimold W. U.* Corner B. Koeberl C. Brandt D. The Morokweng Structure in the Northwest Province of South Africa: Remnant of a Large Impact Structure? Preisinger A.* Aslanian S. Branstatter F. Grass F. Thin Shales in Marine Sediments Rich in Spinels and Iridium Bohor B. F.* Koeberl C. Are Microtektites Really Micro-Tektites? Bhandari N.* Shukla P. N. Ghevariya Z. G. Multiple Iridium Rich Layers in the Anjar K/T Section Gurov E. P.* Gurova E. P. Glassy Bombs of the Elgygytgyn Impact Crater Friday, July 26, 1996 MOON 2:00 p.m. Kinosaal Chair(s): L. P. Keller R. Wieler Taylor S. R.* The Composition of the Moon: Recent Developments Drake M. J.* Geochemical Constraints on the Origin of the Moon: Abundance of U Keller L. P.* McKay D. S. Space Weathering Effects in the Fine-Size Fraction of Lunar Soils Ryder G.* Stockstill K. R. Finding the Recipe for Impact Melts: The Serenitatis Basin Poikilitic Melt Rocks Strait M. M.* Wentworth S. J. McKay D. S. Sorted Glass Spherules in Lunar Patina Dreibus G.* Spettel B. Wlotzka F. Jochum K. P. Schultz L. Weber H. W. Wanke H. Chemistry, Petrology, and Noble Gases of Basaltic Lunar Meteorite QUE94281 Wieler R.* Kehm K. Meshik A. P. Hohenberg C. M. Solar Ar, Kr, and Xe in Further Single Grains from Lunar Regolith Samples of Low and High Antiquity TITLE-ONLY PRESENTATIONS Povenmire H. The Upsilon Pagasid Meteor Shower--Slightly Hyperbolic? Povenmire H. Tibetan Tektites--Authentic? Fioretti A. M. Molin G. Petrography and Mineralogy of FRO 93008 Ureilite: Evidence for Pairing with FRO 90054 Ureilite Tao K. Yang Z. Zhang P. A Stony-Iron Meteorite Fall from Dongwu Banner, Inner Mongolia, China, on September 7, 1995 Barakat A. A. de Michele V. Levi-Donati G. R. Negro G. Serra R. The Desert of Great Sand Sea (GSS), Egypt: An Interesting Reservoir of Meteorite Finds Kashkarov L. L. Ivliev A. I. Kalinina G. V. Bulgakova L. M. Radiation and Shock-Thermal History of the Zagami Meteorite by Track and Thermoluminescence Investigation Therriault A. M. Ostermann M. Grieve R. A. F. Deutsch A. Are Vredefort Granophyre and Sudbury Offsets Birds of a Feather? Miyamoto M. Pyroxene Exsolution Lamella of the Ibitira Noncumulate Eucrite: Implication for Annealing Nomura K. Miyamoto M. Hydrothermal and Heating Experiments on Formation of Na-rich Secondary Minerals in CAIs Hammer C. Maurette M. Micrometeorite Flux on the Melt Zone of the West Greenland Ice Sheet Hennig C. Geist V. Brenner S. Microdiffraction Investigations with the Kossel Technique on Iron Meteorites Velbel M. A. Matty D. J. Petrographic Description and Classification of the Coleman, Michigan, Meteorite: A New Equilibrated Ordinary Chondrite Fall