Terrestrial weathering of Antarctic stone meteorites - Formation of Mg-carbonates on ordinary chondrites

Details Terrestrial weathering of Antarctic stone meteorites - Formation of Mg-carbonates on ordinary chondrites Terrestrial weathering of Antarctic stone meteorites - Formation of Mg-carbonates on ordinary chondrites

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55...67v&link_type=abstract

(Workshop on Differences between Antarctic and non-Antarctic Meteorites, Vienna, Austria, July 27, 28, 1989) Geochimica et Cosmo

Computer Science

23

Antarctic Regions, Carbonates, Chondrites, Meteoritic Composition, Stony Meteorites, Weathering, Electron Microscopy, Magnesium Compounds, Olivine, Thermodynamic Properties, X Ray Diffraction, Meteorites, Weathering, Antarctic Meteorites, Stony Meteorites, Eocs, Magnesium, Carbonate, Ordinary Chondrites, Laboratory Studies, Xrd, Sem, Samples, Meteorite, X-Ray Methods, Electron Microscopy, Lew Meteorites, Lew 85320, H5 Chondrites, Chondrites, Crystals, Composition, Abundance, Sodium, Potassium, Calcium, Rubi

Scientific paper

Results are presented on the mineralogy, chemistry, and origin of white efflorescences on the surface of Lewis Cliff (Antarctica) 85320 (H5) chondrite (LEW 85320). Particular attention is given to determining the sources of the cations and anions of the evaporite, in order to establish the relative importance of the meteoritic element distribution and terrestrial contamination in the evaporite formation during the weathering process. The data on Na, K, Ca, and Rb abundances in efflorescence from LEW 85320 suggest that cations in evaporite minerals on Antarctic meteorites are not the products of contamination by terrestrial (marine) salts. It is suggested that the Mg in efflorescence on LEW 85320 originated from weathering of meteoritic olivine.

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