Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1503z&link_type=abstract
Lunar and Planetary Science, volume 27, page 1503
Computer Science
7
Aqueous Alterations, Inclusions: Dark
Scientific paper
Using optical microscopy, scanning electron microscopy (SEM), electron microprobe analysis (EPMA) and transmitted electron microscopy (TEM), we studied several chondrules and isolated forsterite grains in a Type A/B Allende dark inclusion 5a2. All chondrules and isolated forsterite grains in this dark inclusion show various degrees of replacement by fayalitic olivine which occurs in two textural types: compact rims around forsterite grains and plate-like euhedral and subhedral olivine grains surrounded by finer-grained olivine, chromite, hercynite, Fe-Ni sulfides, nepheline and sodalite. We found that plate-like fayalitic olivines in the Allende dark inclusion contain abundant lozenge-shaped voids and planar dislocations which are characteristic for olivine grains produced by dehydration of phyllosilicates. Based on these observations we conclude that Allende dark inclusions experienced various degrees of aqueous alteration and subsequent thermal metamorphism which produced fayalitic olivine rims and plate-like fayalitic olivines and their interstitial mineral assemblage.
Krot Alexander N.
Zolensky Michael E.
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