Layered silicates in Chondritic Porous Aggregate W7029*A : a case of primary growth

Rietmeijer, Frans J.M. & Mackinnon, Ian D.R. (1984) Layered silicates in Chondritic Porous Aggregate W7029*A : a case of primary growth. In Lunar and Planetary Science Conference, Lunar and Planetary Institute, Houston, TX, pp. 687-688.

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Abstract

An important subset of extraterrestrial particles that reach the Earth's stratosphere include the so-called Chondritic Porous Aggregates (CPA's) [1-3]. In general, CPA's have a fluffy morphology and consist of numerous (>104)subparticles that are often <100A in size [4]. Mineral species in CPA's include Mg-rich pyroxene and olivine, Fe- and (Fe,Ni)-sulphides, taenite, Fe,Ni-carbides, magnetite, Ti-metal, a Bi-phase (metal or oxide), and variable amounts of carbonaceous material [1, 5-7]. Hydrated silicates are rare in CPA's and are limited to aggregates that have not been severely altered (thermo-metamorphosed) during atmospheric entry [8]. The presence of hydrated silicates in one cosmic dust particle was established by X-ray diffraction [2] and has been inferred in others by infra-red spectroscopy [8]. If CPA's are cometary, their mineralogy and morphology suggest that at least two episodes of aggregation occurred and that variations in porosity may be related to local differences in ice-to-dust ratio [3].

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ID Code: 59925
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: chondritic porous aggregate, interplanetary dust particle, stratospheric dust, mineralogy of CPAs
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 Lunar and Planetary Institute
Deposited On: 13 May 2013 01:53
Last Modified: 13 May 2013 01:53

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