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.
Poorly characterized phases (PCP's) may constitute up to 30 volume percent of some C2M carbonaceous chondrite matrices  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 . Fuchs et al.  introduced the term PCP in their detailed description of Fe-S-Ni-0 phases in the matrix of Murchison. Ramdohr  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 . 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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|Item Type:||Conference Paper|
|Additional Information:||GeoRef, Copyright 2009, American Geological Institute.
|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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