The petrography, mineralogy and origins of calcium sulphate within the Cold Bokkeveld CM carbonaceous chondrite

Details The petrography, mineralogy and origins of calcium sulphate within the Cold Bokkeveld CM carbonaceous chondrite The petrography, mineralogy and origins of calcium sulphate within the Cold Bokkeveld CM carbonaceous chondrite

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28...53l&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 28, no. 1, p. 53-62.

Computer Science

14

Calcium Compounds, Carbonaceous Chondrites, Chemical Composition, Meteoritic Microstructures, Petrography, Crystal Structure, Electron Microscopy, Gypsum, Precipitation (Chemistry), Meteorites, Stony Meteorites, Chondrites, C Chondrites, Petrography, Mineralogy, Calcium Sulphate, Origin, Formation, Cm2 Chondrites, Veins, Cold Bokkeveld, Laboratory Studies, Samples, Meteorite, Fractures, Sem, Tem, Composition, Crystals, Procedure, Chondrules, Matrix, Inclusions, Gypsum, Precipitation, Parent Bodies, Calcium,

Scientific paper

A detailed scanning and transmission electron microscopy study was carried out on the Cold Bokkeveld chondrite. Fracture-filling calcium sulphate, calcium sulphate within calcitized chondrules and within the matrix calcite was examined. Results indicate that calcium sulphate is widespread and the majority of its crystals are fibrous. The calcium sulphate is composed of a fine-scale structure of hemihydrate and anhydrate which may have been formed by dehydration of primary gypsum during sample preparation. The timing and origin of aqueous solutions and alteration of the chondrite are discussed and possible links with CI meteorites are considered.

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