Automated thin-film analyses of hydrated interplanetary dust particles in the analytical electron microscope

Details Automated thin-film analyses of hydrated interplanetary dust particles in the analytical electron microscope Automated thin-film analyses of hydrated interplanetary dust particles in the analytical electron microscope

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101..162g&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 101, no. 2-4, Dec. 1990, p. 162-179. Research supported by McCrone As

Computer Science

20

Carbonaceous Chondrites, Chemical Composition, Electron Microscopy, Interplanetary Dust, Iron, Magnesium, Meteoritic Composition, Silicon

Scientific paper

A 200 keV electron microscope was used to obtain elemental analyses from over 4000 points on thin sections of eight 'layer silicate' class interplanetary dust particles (IDPs). Major and minor element abundances from a volume approaching that of a cylinder 50 nm in diameter were observed. Mineral phases and their relative abundances in the thin sections were identified and petrographic characteristics were determined. Three of the particles contained smectite (1.0-1.2 nm basal spacing) and two contained serpentine (0.7 nm basal spacing). The point count analyses and Mg-Si-Fe ternary diagrams show that one of the serpentine-containing IDPs is similar to CI and CM chondritic meteorites. The IDPs exhibit evidence of aqueous processing, but they have typically experienced only short range, submicrometer scale alteration. The IDPs may provide a broad sampling of the asteroid belt.

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