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| possible sources of heat necessary for converting martensite to coarse Type III plessite in ordinary chondrites...that the unusual Type III plessite in the Kingfisher, Oklahoma black chondrite was formed by partial homogenization...than by decomposition of shock reheated prior martensite in the a + 'Y field, as originally proposed by...Taylor and Heymann. Because martensite is sporadically distributed within Kingfisher plessite it is suggested...formed in meteorites by the decomposition of martensite, a2; while Massalski et al. (1966) speculated |
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| (1996) © Meteoritical Society, 1996. Printed in USA. Shock features in iron-nickel metal and troilite...University of Tennessee, Knoxville, Tennessee 37996-1410, USA "Correspondence author's e-mail address: mcsween@utk...an aid for the future shock classification of meteorite groups that have suffered a less intense shock...ofL chondrites shock classified in this study. Meteorite names in italics were selected for further petrographic...petrographic and geochemical work. Meteorite Type Shock Source * Stage Accalana S4 L3 S2 Ausson L5 Bjurbole |
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| California, Los Angeles, California 90095–1567, USA of Meteoritics, Department of Earth and Planetary...University of New Mexico, Albuquerque, New Mexico 87131, USA *Corresponding author. E-mail: aerubin@ucla.edu ...transformed into martensite. Subsequent reheating of the rock caused transformation of martensite into abundant...on OC asteroids. Different components of the meteorite could record different episodes of the rock’s...appears to be an annealed impact-melt breccia. The meteorite was found as a single 8.9 kg stone at a location |
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| microprobe study of metal particles in the ICingfisher meteorite G. J. TAYLOR and D. HEYMANN Departments of Geology...microstruotures which can best be oles of the Kingfisher chondrite. described as very coarse plessites...a2-phase. In the case of Kingfisher the transformation occurred when the meteorite was reheated by shock...for the largest grains. INTRODUCTION THE KINGFISHER meteorite is a black hypersthene chondrite, a group...-nickel-iron, often called martensite. HEYMANN reported that the metal in Kingfisher is unusual : it occurs |
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| California, Los Angeles, California 90095–1567, USA E-mail: aerubin@ucla.edu (Received 23 May 2003; revision... 1499 © Meteoritical Society, 2003. Printed in USA. 1500 A. E. Rubin intergrowths, metallic Cu,...cm-long slab of NWA 428 (LC 1887) in the UCLA meteorite collection was examined macroscopically. Thin...Rare metal grains, particularly those near the meteorite surface, have thicker rinds. Most troilite grains...with the darker colored material in the host meteorite, consist of highly recrystallized L6 material |
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| 2004 Copyright © 2004 Elsevier Ltd Printed in the USA. All rights reserved 0016-7037/04 $30.00 ⫹ .00 Pergamon...University of California, Los Angeles, CA 90095-1567, USA (Received February 28, 2003; accepted in revised...rapidly solidified metal-sulfide intergrowths, martensite and various types of plessite, metal-sulfide...intergrowths, metal nodules, polycrystalline troilite, martensite, plessite, irregular grains of troilite within...troilite grains inside metallic Fe-Ni (Rubin, 1994), martensite and various types of plessite (e.g., Smith and |
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| Table 1. Cooling rates of ordinary chondrites Meteorite Bronzite ohondrites Bath Cee Vee Ehole’ Forest...counted the number of taenite grains in each meteorite and noted whether they were zoned or clear, abutted...pre-existing marten&e When a$ Ni-Fe (often called martensite) is heated to temperatures within the binary...composition of clear taenite implies transformation of martensite to taenite and kamacite below 4OO”C,but the Ni...those that were formed by the decomposition of martensite; see MASSALSKIet al., 1966) suggest that the |
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| samples of the naturally unshocked Kemouve (H6) meteorite were artificially shock-loaded to pressures of...kamacite displays incipient polycrystallinity and cy-martensite and taenite sometimes contains slip lines. Troilite...chemistry. Three of these major epterpreting meteorite properties, although on many ocisodes are condensation...some very early stage in the laboratories on meteorite material which has been arhistory of unequilibrated...aspect in the history of meteorites. With erage of meteorite properties, but they are three very 343 D. W |
