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Record Details

Record 18 of 417
Layer silicates in a chondritic porous interplanetary dust particle
Author and Affiliation:
Rietmeijer, F. J. M.(NASA Johnson Space Center, Houston, TX, United States)
Mackinnon, I. D. R.(Microbeam, Inc., Houston, TX, United States)
Abstract: Analytical electron microscopy on individual grains from a portion of a chondritic porous interplanetary dust particle (aggregate W7029C1 from the NASA Johnson Space Center Cosmic Dust Collection) shows that layer silicates compose 50 percent of the silicate fraction examined. These layer silicates can be classified into two distinct crystallochemical groups: (1) fine-grained, polycrystalline smectite minerals; and (2) well-ordered, single crystals of kaolinite and Mg-poor talc. The layer silicates in this portion of sample W7029(asterisk)A are dissimilar to those described in other chondritic porous aggregates. The predominant layer silicate assemblage in W7029(asterisk)A indicates that heating of the aggregate during atmospheric entry was brief and probably to a temperature less than 300 C. Comparison with terrestrial phyllosilicate occurrences suggests that some layer silicates in aggregate W7029(asterisk)A may have been formed by alteratiton from preexisting silicate minerals at low temperatures (less than 25 C) after aggregate formation.
Publication Date: Nov 15, 1985
Document ID:
19860035326
(Acquired Nov 28, 1995)
Accession Number: 86A20064
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 90; D149-D15
Publisher Information: United States
Contract/Grant/Task Num: NAS9-17005; NAS9-17391
Financial Sponsor: NASA; United States
Organization Source: Microbeam, Inc.; Houston, TX, United States
NASA Johnson Space Center; Houston, TX, United States
Description: 7p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CHONDRITES; INTERPLANETARY DUST; SILICATES; AGGREGATES; ELECTRON MICROSCOPY; ENERGY SPECTRA; POROUS MATERIALS; STRATA
Imprint And Other Notes: (Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston, TX, Mar. 11-15, 1985) Journal of Geophysical Research, Supplement (ISSN 0148-0227), vol. 90, Nov. 15, 1985, p. D149-D155.
Availability Source: Other Sources
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