WORKSHOP ON PARENT-BODY AND NEBULAR MODIFICATION OF CHONDRITIC MATERIALS LPI Technical Report Number 97-02, Part 1 Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 LPIITR--97 -02, Pan 1 WORKSHOP ON PARENT-BODY AND NEBULAR MODIFICATION OF CHONDRITIC MATERIALS Edited by M. E. Zolensky, A. N. Krot, and E. R. D. Scott Held at Maui, Hawai'i July 17-19,1997 Hosted by Hawai'i Institute of Geophysics & Planetology University of Hawai'i Sponsored by Lunar and Planetary Institute University ofHawai'i National Aeronautics and Space Administration NASA Integrated Systems Network Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 LPI Technical Report Number 97-02, Part 1 LPIITR--97-02, Part 1 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 ofany paper or portion thereof requires the written permission ofthe authors as well .as the appropriate acknowledgment of this publication. This report may be cited as Zolensky M. E., Krot A. N., and Scott E. R. D., eds. (1997) Workshop on Parent-Body and Nebular Modification of Chondritic Materials. LPI Tech. Rpt. 97-02, Part I, Lunar and Planetary Institute, Houston. 71 pp. This report is distributed by ORDER DEPARTMENT Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 Mail order requestors will be invoiced for the cost ofshipping and handling. Cover: Olivine with amorphous olivine rims in a primitive (?) clast in the Ningqiang chondrite. View measures I Ilm across. LP] Technical Report 97-02. Part] 111 Preface This volume contains abstracts that have been accepted for presentation at the Workshop on Parent-Body and Nebular Modification ofChondri tic Materials, July 17-19, 1997, in Maui, Hawai'i. The workshop was organized by co-conveners M. E. Zolensky (NASA Johnson Space Center), A. N. Krot (University ofHawai'i), and E. R. D. Scott (University ofHawai'i). Members ofthe Scientific Organizing Committee were A. Bischoff (Institut for Plane to logie, Munster), P. Cassen (NASA Ames Research Center), B. Fegley Jr. (Washington University), K. Keil (University ofHawai'i), J. Kerridge (University ofCalifornia-San Diego), H. Nagahara (University ofTokyo), H. Palme (Universitiit zu Koln), S. Russell (Smithsonian Institution), and K. Tomeoka (Kobe Univers,ity). Logistics and administrative and publications support for the workshop were provided by the staff ofthe Lunar and Planetary Institute. LPI Technical Report 97-02, Part I v Contents Thermally Metamorphosed Antarctic CM and CI Carbonaceous Chondrites in Japanese Collections, and Transformation Processes ofPhyllosilicates J. Akai and S. Tari .................................................... .......................................................................... 1 Aqueous Alteration of Carbonaceous Chondrites: Evidence for Preaccretionary Alteration A. Bischoff.... ................................................................................. ...................................................... 2 Magnetite in Vigarano: An Iron-57 M6ssbauer Spectroscopy Study P. A. Bland, M. A. Sephton, A. W. R. Bevan, F. J. Berry, J. M. Cadogan, and C. T Pi/linger .............................................................................................. '" ... 3 Metamorphic Transformations of Opaque Minerals in Chondrites M Bourot-Denise, B. Zanda, and R .. Hewins ........................................................................ ............ 5 Unraveling Nebular and Parent-Body Effects in Chondrite Matrixes: Mineralogical and Compositional Constraints A. J. Brearley ........ .......................................................................................................... .................... 7 Chlorine-bearing Melt Inclusions in Olivine from Unequilibrated Ordinary Chondrites J. C. Bridges .............................................................................................................................. ......... 8 A Search for Accretionary Textures in CM Chondrites L. Browning .... .................................................................................................................................... 9 Use of Oxygen Isotopes to Constrain the Nebular and Asteroidal Modification of Chondritic Materials R. N. Clayton ................................................................................................................. ................... lO Turbulent Size Selection and Concentration of Chondrule-sized Objects: Reynolds Number Invariance and Implications J. N. Cuzzi, R. Hogan, A. Dobrovolskis, and J. Paque ..................................................................... 11 Effect of Revised Nebular Water Distribution on Enstatite Chondrite Formation K. E. Cyr, M L. Hutson, and J. 1. Lunine ........................................... .............................................. 12 Interstellar Hydroxyls in Meteoritic Chondrules: Implications for the Origin of Water in the Inner Solar System E. Deloule, J.-c. Doukhan, and F. Robert .................................................................. ..................... 13 Theoretical Models and Experimental Studies ofGas-Grain Chemistry in the Solar Nebula B. Fegley Jr. .................................................................................................................................... 14 vi Workshop on Modification of Chondritic Materials The Chondrite-Achondrite Transition: Decoupling of Oxygen Isotope and Geochemical Changes C. A. Goodrich .................................................................................................................................. 15 Progressive Alteration ofCM2 Chondrite Matrixes: Determining Relative Phyllosilicate Contents by X-Ray Diffraction M M Grady, M. Batchelder, G. Cressey, and M J Genge ............................................................ 17 Primitive Matrix Components of the Unique Carbonaceous Chondrite Acfer 094: Clues to Their Origin A. Greshake ............................. .. .. ............................. .............................................................. .......... 18 Chemical Alteration of Chondrules on Parent Bodies J N. Grossman, C. M. 0 'D. Alexander, and J. Wang ...................................................................... 19 Thermal Quenching of Silicate Grains in Proto stellar Sources S. L. Hallenbeck, J A. Nuth, and F. J. M Rietmeijer .. ................ ..................................................... 20 Iron-rich Aureoles as Recorders ofIn Situ Aqueous Alteration in the CM Carbonaceous Chondrites Murray, Murchison, and Allan Hills 81002 N. P. Hanowski and A. J Brearley ....................................... ..................... ..................................... .. 21 Transportation of Gaseous Elements and Their Isotopes in a Thermally Evolving Chondritic Planetesimal K. Hashizume and N. Sugiura .......................................................................................................... 22 An Experimental Study of Magnetite Formation in the Solar Nebula Y Hong and B. Fegley Jr. .................. ................................................. ........................................... 23 Lightning and Shock Heating as Candidate Processes for Chondrule Formation M Horanyi ........................................................................................................................................ 24 Fayalitic Halos Within Forsterites from Carbonaceous Chondrites X Hua and P. R. Buseck .. ................................................................................................................. 25 Presolar Grains as Tracers of Nebular and Parent-Body Processing of Chondritic Material G. R. Huss ......................................................................................................................................... 26 Chronologic Constraints on Secondary Alteration Processes l. D. Hutcheon .................................................................................................................................. 27 Elemental Redistribution by Aqueous Fluids in Un equilibrated Ordinary Chondrites: Tieschitz and Semarkona Compared R. Hutchison, C. M. 0 'D. Alexander, and J. C. Bridges .................................................................. 27 LPI Technical Report 97·02;Part 1 vii Anhydrous Alteration of Allende Chondrules in the Solar Nebula Y. Ikeda and M. Kimura .......................................... .. .......................... ............................................. 29 The Kaidun Meteorite: Evidence for Pre- and Postaccretionary Aqueous Alteration A. V. Ivanov, G. Kurat, F. Brandstatter, L. F. Migdisova, and N. N. Kononkova ...... ~ ................................................................................................................. 29 Alteration of Plagioclase-rich Chondrules in C03 Chondrites: Evidence for Late-stage Sodium and Iron Metasomatism in a Nebular Environment R. H. Jones .. ............... ............................................................................... ........................................ 30 A Transmission Electron Microscope Study ofthe Matrix Mineralogy of the Leoville CV3 (Reduced-Group) Carbonaceous Chondrite: Nebular