Diagenesis in interplanetary dust - chondritic porous aggregate w7029-star-a

Rietmeijer, Frans J.M. & Mackinnon, Ian D.R. (1984) Diagenesis in interplanetary dust - chondritic porous aggregate w7029-star-a. Meteoritics, 19(4), p. 301.

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Abstract

In previous Analytical Electron Microscope studies of extraterrestrial Chondritic Porous Aggregate (CPA) W7029* A, we have reported on the presence of layer silicates(Rietmeijer and Mackinnon, 1984a; Mackinnon and Rietmeijer, 1983) and metal oxides (Rietmeijer and Mackinnon, 1984a; Mackinnon and Rietmeijer, 1984). We present here a continuation ofthis detailed mineralogical study and propose a scenario which may account for the variety and types of phases observed in this CPA. At least 50% ofCPA W7029A is carbonaceous material, primarily poorly graphitised carbon (POC) with morphologies similar to POC in acid residues of carbonaceous chondrites (Smith and Busek, 1981; Lumpkin, 1983). The basal spacing of graphite in CPA W7029A ranges from 3.47-3.52 A and compares with doo, of graphite in the Allende residues (Smith and Buseck, 1981; Lumpkin, 1983). Low-temperature phases comprise - 20% of CPA W7029*A and include layer silicates, Bi,O" a-FeOOH(Rietmeijer and Mackinnon, 1984a; Mackinnon and Rietmeijer, 1983), BaSO.,.Ti.O, plates, pentlandite-violarite and bornite. Clusters of Mg-rich olivine and pyroxene make up - 12% of the aggregate...

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5 citations in Web of Science®
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ID Code: 57501
Item Type: Journal Article
Refereed: Yes
Additional Information: ISI Document Delivery No.: ACN16
Times Cited: 5
Cited Reference Count: 11
Rietmeijer, fjm mackinnon, idr
Meteoritical soc
Fayetteville
Keywords: interplanetary dust, stratospheric dust collection, mineralogy, chondritic porous
ISSN: 0026-1114
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
Deposited On: 25 Feb 2013 01:33
Last Modified: 25 Feb 2013 01:33

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