The distribution of evaporitic weathering products on Antarctic meteorites

Details The distribution of evaporitic weathering products on Antarctic meteorites The distribution of evaporitic weathering products on Antarctic meteorites

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987asee....2.....v&link_type=abstract

In NASA. Johnson Space Center, NASA/ASEE Summer Faculty Fellowship Program, 1987, Volume 2 20 p (SEE N88-14874 06-85)

Mathematics

Logic

Antarctic Regions, Categories, Meteorites, Mineralogy, Weathering, Chemical Composition, Magnesium, X Ray Diffraction

Scientific paper

White evaporite deposits of terrestrial origin occur on some 5 percent of Antarctic meteorites. The few previous studies, and new mineralogical analyses, indicate that the deposits are predominately carbonates and/or sulfates of magnesium. The distribution of white evaporitic salt deposits differs among different meteorite compositional groups and weathering categories. Salts occur with unusual frequency on carbonaceous chondrites, and are especially common in carbonaceous chondrites of weathering categories A and B. Among achondrites, weathering categories A and A/B show the most examples of salt weathering. Unlike carbonaceous chondrites and achrondites, most salt-bearing ordinary (H and L) chondrites are from rustier meteorites of weathering categories B, and to a lesser degree, B/C and C. The LL chondrites are conspicuous by their complete lack or any salt-weathering product. Almost two-thirds of all evaporite-bearing meteorites belong to weathering categories, A, A/B, and B. Where chemical and/or mineralogical data are available, there is a persistent suggestion that evaporite formation is accompanied by elemental redistribution from meteorite interiors. Meteorites of weathering categories B, A/B, and even A may have experienced significant element redistribution and/or contamination as a result of terrestrial exposure.

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