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| ON TYPE III PLESSITE IN CHONDRITES Reed Knox, Jr. 444 Woodbine A venue Narberth, PA 19072 Questions...Type III plessite in ordinary chondrites. It is suggested that the unusual Type III plessite in the Kingfisher...Kingfisher, Oklahoma black chondrite was formed by partial homogenization of preexisting Type III plessite as...martensite is sporadically distributed within Kingfisher plessite it is suggested that microstructures of this...kind be called Type II-III plessite. Wood (1964) suggested that plessite in general was formed in meteorites |
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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...and fizzed troilite, coarse-grained pearlitic plessite, polycrystalline troilite, and polymineralic melt...postshock temperatures obtained from analyses of plessite components show a systematic increase in temperature...an aid for the future shock classification of meteorite groups that have suffered a less intense shock |
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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...martensite. HEYMANN reported that the metal in Kingfisher is unusual : it occurs in relatively large particles |
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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 ...transformation of martensite into abundant duplex plessite. Ambiguities exist in the shock stage assignment...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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| California, Los Angeles, California 90095–1567, USA E-mail: aerubin@ucla.edu (Received 23 May 2003; revision...metallic Fe-Ni, polycrystalline troilite, duplex plessite, metal and troilite veins, large troilite nodules... 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 |
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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...intergrowths, martensite and various types of plessite, metal-sulfide veins, large metal and/or sulfide...atmospheric passage of the meteoroid host. Zoneless plessite particles (Sears and Axon, 1975) were not considered...nodules, polycrystalline troilite, martensite, plessite, irregular grains of troilite within metallic |
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| karnactite fmm \Yellrnat~. Scalp bar: of a type-111 plessite iti particle is showy in Fig. 7. (B) Photornictograph...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...5% Ni. For example, we think that the type-III plessite from Kandahar shown in Fig. 2B formed by the decomposition...than due to a real variation. A similar type-III plessite was studied in the Bath C;, .J. TAYLORund 1) |
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| 224±O.045 Si/Al l5.6±l.6 l6.7±1.3 THE IRON METEORITE BARRANCA BLANCA H. J. Axon and D. Faulkner, Faculty...of sulphides and polycrystalline taenite. The plessite is unusual in that it shows internal grain boundaries...kamacite-taenite; kamaciteschreibersite and taenite-plessite locations. It appears probable that nickel diffused...diffused along the internal grain boundaries of the plessite and in some cases these boundaries appear to have...the microstructure. 257 THE BORGO SAN DONNINO METEORITE: MINERALOGY AND CHEMISTRY B. Baldanza and G. R |
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| samples of the naturally unshocked Kemouve (H6) meteorite were artificially shock-loaded to pressures of...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...has allowed new insights into the behavior of meteorite material under dynamic loading. EXPERIMENTAL Material |
