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Largemeteoriteimpactsand Planetaryevolution qF URY 1997 LARGEMETEORITEIMPACTSAND PLANETARYEVOLUTION September1-3,1997 Sudbury,Ontario ! F CONFERENCE ON LARGE METEORITE IMPACTS AND PLANETARY EVOLUTION (SUDBURY 1997) Hosted by Ontario Geological Survey Sponsored by Inco Limited Falconbridge Limited The Barringer Crater Company Geological Survey of Canada Ontario Ministry of Northern Development and Mines Quebec Minist_re des Ressources naturelles Lunar and Planetary Institute Scientific Organizing Committee A. Deutsch University of Miinster, Germany B. O. Dressier, Chair Lunar and Planetary Institute, Houston, Texas B. M. French Smithsonian Institution, Washington, DC R. A. F. Grieve Geological Survey of Canada, Ottawa, Ontario G. W. Johns Ontario Geological Survey, Sudbury, Ontario V. L. Sharpton Lunar and Planetary Institute, Houston, Texas LPI Contribution No. 922 Compiled in 1997 by LUNAR AND PLANETARY INSTITUTE The Institute is operated by the Universities Space Research Association under Contract No. NASW-4574 with the National Aeronautics and Space Administration. Material in this volume may be copied without restraint for library, abstract service, education, or personal research purposes; however, republication of any paper or portion thereof requires the written permission of the authors as well as the appropriate acknowledgment of this publication. Abstracts in this volume may be cited as Author A. B. (1997) Title of abstract. In Conference on Large Meteorite Impacts and Planetary Evolution (Sudbury 1997), p. XX, LPI Contribution No. 922, Lunar and Planetary Institute, Houston. This volume is distributed by ORDER DEPARTMENT Lunar and Planetary Iustitute 3600 Bay Area Boulevard Houston TX 77058-1113, USA Mail order requestors will be invoiced for the cost of shipping and handling. LP! Contribution No. 922 iii Contents BP and Oasis Impact Structures, Libya, and Their Relation to Libyan Desert Glass: Petrography, Geochemistry, and Geochronology B. Abate, C. Koeberl, J. R. Underwood Jr., E. P. Fisk, and R. F. Giegengack ................................... 1 - ( Overview of Bosumtwi Crater, Ghana S. T. Ahulu ........................................................................................................................................... 1 ._a..- Crater-fill Sequence, Onaping Formation: Petrographic and Geochemical Signature of Regional Hydrothermal Alteration D. E. Ames and H. L. Gibson .............................................................................................................. 1 - Impact-induced Hydrothermal Base Metal Mineralization, Whitewater Group, Sudbury Structure D. E. Ames, H. L. Gibson, and I. R. Jonasson .................................................................................... 2 - y Nickel- and Platinum-Group-Element-Enriched Quartz Norite in the Latest Jurassic Morokweng Impact Structure, South Africa M. A. G. Andreoli, R. J. Hart, L. D. Ashwal, and M. Tredoux ............................................................ 3 -5f Simulating Phase Equilibria and In Situ Differentiation for the Proposed Parental Sudbury Magmas A. A. Ariskin ........................................................................................................................................ 3 _'b, Investigations on the Green Member of the Onaping Formation, Sudbury Structure, Ontario, Canada M. E. Avermann .................................................................................................................................. 4 _ 7 Extraterrestrial Helium (He@C_ Trapped in Fullerenes in the Sudbury Impact Structure L. Becket, J. L. Bada, R. J. Poreda, and T. E. Bunch ......................................................................... 5 - Summary of Work in Manicouagan Impact Structure L. Boivin ............................................................................................................................................. 5 " Composition and Structure of the Chicxulub Crater Using Wide-Angle Seismic Velocities J.. Brittan, H Macintyre, and the Chicxulub Working Group ............................................................. 6 - / _ Synthetic Aperture Radar Characteristics of a Glacially Modified Meltsheet, Manicouagan, Quebec P. Budkewitsch and R. Grieve ............................................................................................................. 6- s/ New Potential Sources for Black Onaping Carbon T. E. Bunch, L. Becker, P H. Schultz, and W. S. Wolbach .................................................................. 7 -/L- Ecosystem-Structure Analysis Applied to Indication and Study of Earth Astroblemes G. G. Burba Jr 7 "-/_ Sedimentary Interbeds of the Rooiberg Group at the Loskop Dam Section, Bushveld Complex, South Africa M. E. Caress and W. E. Elston ............................................................................................................ 8 -/.4- iv 1997 Sudbury Conference The Chicxulub Seismic Experiment Chicxulub Working Group: d. Morgan, M. Warner, J. Brittan, H. Macintyre, D. Snyder, R. Hobbs, G. Suarez, L. Marin, A. Trejo, R. Buffler, G. Christeson, Y. Nakamura, A. Hildebrand, M. Pilkington, V..Sharpton, P Maguire, P Denton, G. Mackenzie, andA. Camargo .......................... .............................................................. 9 "/_" Structure of the Chicxulub Impact Crater from Wide-Angle Ocean-Bottom Seismograph Data G. L. Christeson, Y. Nakamura, R. T. Buffler, and the Chicxulub Working Group ............................................................................................................ 9 " /& The Chicxulub Impact Structure and Its Proximal Ejecta P. Claeys, A. Deutsch, F. Langenhorst, S. Heuschkel, B. Dissman, and D. Strffler ......................................................................................... 9 Chemical Compositions of Chicxulub Impact Breccias C. M. Corrigan, V. L. Sharpton, T. A. Vogel and L. E. Marin ................................................................................................................................ 10 Funnel-shaped Emplacement Geometry of the Sudbury Igneous Complex: A Structural Perspective E. J. Cowan and W. M. Schwerdtner ................................................................................................ 11 "/_ Sudbury: Geochemical Evidence for a Single-Impact Melting Event A. P. Dickin and d. H. Crocket .......................................................................................................... 11 --_,_ The Separation of Platinum and Palladium During High-Temperature Vaporization of Sulfide-rich Picrite Yu. P Dikov, V. V. Distler, M. V. Gerasimov, and O. L Yakovlev ....................................................... 12 -_ l The Sudbury Structure, Ontario, Canada: A Persistent Enigma B. O. Dressier and V. L. Sharpton .................................................................................................... 12" 2 ;i- Review of the Geophysical Signature of the Vredefort Structure and Its Interpretations R. J. Durrheim and W. U. Reimold ................................................................................................... 13 -,p._x Base of the Rooiberg Group: Evidence for an Initial Bushveld Catastrophe lE. E. Elston and M. E. Caress .......................................................................................................... 14 -D_ Classification and Distribution of Sudbury Breccia J S. Fedorowich, D. H. Rousell, and W. V. Peredery ....................................................................... 14 .,2_" Impact Materials with Mixed Compositions of Iron-Silicon-Nickel-Sulfur System S. Fukuyama, Y. Miura, and H. Kobayashi ...................................................................................... 15--76, Experimental Investigation of the Chemistry of Vaporization of Targets in Relation to the Chicxulub Impact M. V. Gerasimov, Yu. P Dikov, O. I. Yakovlev, and E grr/otzka.i ....... ,i............................................. 15=-2. 7 The Onaping Formation: Stratigraphy, Fragmentation, and Mechanisms of Emplacement S. F.. M. Gibbins, H. L. Gibson, D. E. Ames, and L R. Jonasson .................................................. 16 _ D _/ LPI ContributionNo. 922 v Diagnostic Criteria for the Recognition of Shatter Cones H. M. Gibson and J. G. Spray 16 - ,_ Multiple Origins for Impact-produced Diamonds I. Gilrnour, R. M. Hough, and C. T. Pillinger ................................................................................ 17 -30 Asteroid/Comet Mega-Impacts and Mantle Melting Episodes: Consequences for Precambrian Crustal Evolution A. Y. Glikson .................................................................................................................................. 17 t/ Large-Scale Impact of Cratering and Early Earth Evolution R. A. E Grieve and M. J. Cintala .................................................................................................. 18 -,,_,- Geophysical Modeling of the Mj_lnir Impact Structure, Barents Sea S. T. Gudlaugsson, F. Tsikalas, O. Eldholm, and J. I. Faleide ...................................................... 19 -:_-_ Magnetic Anomalies of the Vredefort Central Rise Structure H. Henkel ...................................................................................................................................... 19 "fl NBCS: The Baltic-Nordic Network for Impact Crater Studies H. Henkel ...................................................................................................................................... 20 _D Combined
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