Poorly characterized phases in C2M carbonaceous chondrites : proposed structures and significance

Mackinnon, Ian D.R. & Zolensky, Michael E. (1984) Poorly characterized phases in C2M carbonaceous chondrites : proposed structures and significance. In Lunar and Planetary Science Conference, Lunar and Planetary Institute, Houston, TX, pp. 501-502.

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Abstract

Poorly characterized phases (PCP's) may constitute up to 30 volume percent of some C2M carbonaceous chondrite matrices [1] and are an important key to an understanding of matrix evolution. PCPs are usually fine-grained (<lµm in size), and are difficult to characterize by conventional optical or X-ray techniques [2]. Fuchs et al. [2] introduced the term PCP in their detailed description of Fe-S-Ni-0 phases in the matrix of Murchison. Ramdohr [3] described a similar Fe-S-C phase with trace amounts of Ni in five carbonaceous chondrites and proposed that this mineral has a layer structure. Both the Fe-S-Ni-0 and Fe-S-Ni-C phases have similar optical properties and are conveniently described by the generic term PCP [1]. On the basis of recent high resolution electron microscopy (HREM) studies [4-9], we propose that these PCP's form at least two ordered, stable structures based upon alternating sequences of mackinawite- and brucite- (or amakinite-) type layers.

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ID Code: 55650
Item Type: Conference Paper
Refereed: Yes
Additional Information: GeoRef, Copyright 2009, American Geological Institute.
1986-017592
Keywords: brucite, carbonaceous chondrites, mackinawite, matrix, meteorites, mixed-layer minerals, optical properties, oxides, phase equilibria, serpentine group, sheet silicates, stony meteorites, sulfides, tochilinite
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Extraterrestrial Geology (040302)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
Divisions: Current > Institutes > Institute for Future Environments
Copyright Owner: Copyright 1984 (please consult the authors).
Deposited On: 30 Jan 2013 23:24
Last Modified: 04 Apr 2013 16:20

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