Zoning of trace elements and deuterium in the mesostasis of low-FeO chondrules in Semarkona

Details Zoning of trace elements and deuterium in the mesostasis of low-FeO chondrules in Semarkona Zoning of trace elements and deuterium in the mesostasis of low-FeO chondrules in Semarkona

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..481g&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 481.

Other

6

Chondrule, Trace Elements, Deuterium, Iron Oxides, Rocks, Meteoritic Composition, Volatility, Crystal Structure

Scientific paper

There are several lines of evidence indicating that some chondrules in Semarkona (LL3.0) and other unequilibrated ordinary chondrites experienced late (sub-solidus) changes in their abundances of volatile elements. Many fine-grained chondrules, especially cryptocrystalline ones, have 'bleached' zones near their surfaces where alkalis and other elements once present in feldspathic glass have been removed. The process responsible for this phenomenon is most likely in situ aqueous alteration, where fluids circulating in the rock dissolved the very fine-grained mesostasis in the outer portions of the chondrules. Conversely, the mesostasis in the outer portions of many low-FeO chondrules is greatly enriched in the volatile elements Na, K, and Mn compared to the mesostasis near the centers of these chondrules. This can only be explained by the entry of these elements into the chondrules in some sort of alteration process after solidification. One possibility for the alteration of low-FeO chondrules might be that the volatiles lost during chondrule formation recondensed into the outer portions of chondrules. To further constrain the nature of this alteration event, a study is conducted of affected glass using ion microprobe analysis.

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