Layer silicates in a chondritic porous interplanetary dust particle
Rietmeijer, F. J. M. & Mackinnon, Ian D. R. (1985) Layer silicates in a chondritic porous interplanetary dust particle. Journal of Geophysical Research-Solid Earth and Planets, 90, D149-D155.
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 300C. 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 25C) after aggregate formation.
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|Item Type:||Journal Article|
|Additional Information:||ISI Document Delivery No.: AWZ62
Times Cited: 29
Cited Reference Count: 57
Rietmeijer, fjm mackinnon, idr
Amer geophysical union
|Keywords:||chondritic porous IDP, analytical electron microscopy, layer silicates, silicate alteration, stratospheric dust|
|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 1985 American Geophysical Union|
|Deposited On:||11 Mar 2013 01:56|
|Last Modified:||11 Mar 2013 01:56|
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