The compositional classification of chondrites. II - The enstatite chondrite groups

Details The compositional classification of chondrites. II - The enstatite chondrite groups The compositional classification of chondrites. II - The enstatite chondrite groups

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..597s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Apr. 1982, p. 597-608.

Mathematics

Logic

30

Chondrites, Enstatite, Meteoritic Composition, Mineralogy, Neutron Activation Analysis, Alkali Metals, Chalcogenides, Cosmic Rays, Iron Meteorites, Oxygen Isotopes, Petrology, Silicates, Xenon, Meteorites, Composition, Classification, Chondrites, Enstatites, Rnaa, Neutron Activation Analysis, St. Sauveur Meteorite, Abundance, Alkalis, Siderophiles, Chalcophiles, Petrology, Physical Properties, Cosmic Rays, Ages, Bjurbole Meteorite, Chemistry, Formation, Shallowater Meteorite, Happy Canyon Meteorite, Compari

Scientific paper

The compositional classification of chondrites is investigated to determine whether the enstatite chondrites form a compositional continuum or two discrete compositional populations. New neutron activation data on four enstatite chondrites are reported, including St. Sauveur. Two sets are determined, in which one set has abundances of nonrefractory siderophiles and moderately volatile chalcophiles and alkalis that are 1.5 to 2.0 times higher than in the other. Cosmic ray ages for the high-Fe, high siderophile group (EH) are 0.5-7.0 Ma, while those for the low-Fe, low siderophile group (EL) are 4-18 Ma. Within the EH group no correlation is observed between petrologic type and abundance of nonrefractory siderophiles or moderately volatiles or alkalis, and it is suggested that the EH and EL groups formed separate bodies at similar distances from the sun. Two strongly recrystallized silicate-rich meteorites containing greater than 40 mg/g Fe-Ni are discussed.

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