Chemical studies of H chondrites. I - Mobile trace elements and gas retention ages

Details Chemical studies of H chondrites. I - Mobile trace elements and gas retention ages Chemical studies of H chondrites. I - Mobile trace elements and gas retention ages

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..727l&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, March 1987, p. 727-739.

Mathematics

Logic

9

Chondrites, Gas Composition, Geochemistry, Meteoritic Composition, Trace Elements, Allende Meteorite, High Temperature Environments, Petrology, Meteorites, Stony Meteorites, H Chondrites, Geochemistry, Trace Elements, Gases, Age, Thermal Properties, Classification, Samples, Meteorite, Data, Siderophiles, Comparisons, Shock Effects, Parent Material, Temperature, Fractionation, Origin, Formation, Catalog, Allende, Cv3 Chondrites, Carbonaceous Chondrites, Argon 40, Thermometry, Genesis

Scientific paper

Trends for 16 trace elements (Ag, As, Au, Bi, Cd, Co, Cs, Ga, In, K, Rb, Sb, Se, Te, Tl, and Zn), chosen to span a broad geochemical and thermal response range, in 44 H4-6 chondrites, differ widely from those in L4-6 chondrites. In particular, H chondrites classified as heavily shocked petrologically do not necessarily exhibit Ar-40 loss and vice versa. The clear-cut causal relationship between siderophile and mobile element loss with increasing late shock seen in L chondrites is not generally evident in the H group. H chondrite parent material experienced an early high temperature genetic episode that mobilized a substantial proportion of these trace elements so that later thermal episodes resulted in more subtle, collateral fractionations. Mildly shocked L chondrites escaped this early high temperature event, indicating that the two most numerous meteorite groups differ fundamentally in genetic history.

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