Mechanical aggregation of enstatite chondrites from an inhomogeneous debris cloud

Details Mechanical aggregation of enstatite chondrites from an inhomogeneous debris cloud Mechanical aggregation of enstatite chondrites from an inhomogeneous debris cloud

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..228l&link_type=abstract

Nature, vol. 290, Mar. 19, 1981, p. 228-230.

Other

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Chondrites, Enstatite, Meteoritic Composition, Minerals, Stony Meteorites, Chemical Composition, Debris, Oxygen Isotopes, Silicates, Solar Corona, Meteorites, Chondrites, Enstatites, Oxygen, Isotopic Ratios, Data, Chondrules, Olivines, Pyroxenes, Kota-Kota Meteorite, Analysis, Indarch Meteorite, Electron Microprobe, Diagrams, Luminescence, Color, Textures, Chemistry, Mineralogy, Composition, Condensation, Mixing, Source Medium, Reduction, Petrology

Scientific paper

Enstatite chondrites have oxygen isotope ratios closer to those of the earth and moon than other meteorites. Their minerals are chemically reduced; metal contains Si, and some Ca, Ti, Mg and Mn are incorporated in sulphides rather than silicates. Clinoenstatite and olivine are virtually Fe-free. Two types of clinoenstatite in the Indarch enstatite chondrite have been reported, one luminescing blue and one red. Similar clinoenstatites in the Kota-Kota enstatite chondrite are associated with two distinct types of forsteritic olivine, one luminescing orange and the other blue. The textural relations and differences in chemical composition cannot be explained by progressive condensation from the solar nebula and require the mechanical mixing of material from at least two sources. It is suggested here that enstatite chondrites result from mechanical and chemical processes during aerodynamic sorting and gravitational settling of debris from a hot cloud of dust, liquid and gas produced during collision of planetesimals.

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