Titanium-oxide magneli phases in four chondritic porous interplanetary dust particles

Rietmeijer, F. J. M. & Mackinnon, Ian D. R. (1990) Titanium-oxide magneli phases in four chondritic porous interplanetary dust particles. In Proceedings of the Lunar and Planetary Science Conference, Lunar and Planetary Institute, Houston, Texas, pp. 323-333.

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Abstract

Detailed analytical electron microscope analyses of four fine-grained chondritic porous interplanetary dust particles (IDPs)reveal the presence of titanium oxide Magneli phases, TinO2n-1 (n=4,5,6), and rare Ti-metal. The titanium minerals are indigenous to these chondritic IDPs. The association of Magneli phases, Ti-metal, and carbonaceous material in chondritic IDPs, along with the grain size distributions support in situ solid carbon gasification in these extraterrestrial particles. The active catalyst in this process is titanium metal that we infer may be of interstellar origin. This favorable catalysis uniquely leads to the formation of Magneli phases. As chondritic IDPs may be solid debris of short-period comets, our data indicate that nuclei of short-period comets may show distinctive chemical reactions that lead to Ti-mineral assemblages that typically include Magneli phases. The proposed model provides a plausible mechnism to explain the higher solid carbon content of chondritic IDPs relative to bulk carbon abundances typical for carbonaceous chondrite matrices that represent another type of more evolved, that is, metamorphosed, undifferentiated solar system bodies.

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ID Code: 57490
Item Type: Conference Paper
Refereed: Yes
Additional Information: ISI Document Delivery No.: CX381
Times Cited: 4
Cited Reference Count: 59
Rietmeijer, fjm mackinnon, idr
Lunar and planetary inst
Houston
Keywords: interplanetary dust particles, chondritic porous particles, titanium oxide, electron microscopy
ISBN: 0-942862-04-X
ISSN: 0270-9511
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 1989 Lunar and Planetary Institute
Deposited On: 18 Mar 2013 04:44
Last Modified: 18 Mar 2013 04:44

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