Chemical studies of L chondrites—II. Shock-induced trace element mobilization |
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| Authors: | Thomas M Walsh Michael E Lipschutz |
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| Institution: | 1. Department of Chemistry, Purdue University, W. Lafayette, IN 47907, USA;2. Now at IBM, Poughkeepsie, NY 12601, USA |
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| Abstract: | Previous studies of chondrites heated in the laboratory for extended periods under conditions approximating those in shock-heated collisional debris indicate that Au, Co, Se, Ga, Rb, Cs, Te, Bi, In, Ag, Zn, Tl and Cd progress in mobility. We report data for these 13 trace elements in 14 L4–6 chondrites of established shock history and discuss these and 13 additional chondrites studied earlier. Trace element contents vary with petrologic type, sub-group and shock history, the last dominating strongly. Absolute abundances and interelement relationships for the 6 or 7 most mobile elements vary with degree of shock-loading (i.e. residual temperatures) established from mineralogic/petrologic study. A tertiary process, shock-heating, previously known to have affected radiogenic 40Ar and/or 4He in meteorites but not other elements, apparently was at least as effective as other open-system processes (secondary parent body] and primary nebular and/or accretionary] episodes) in establishing mobile trace element contents of L chondrites and probably others. If conditions during early genetic episodes are to be deduced from compositional information, shocked meteorites should be avoided or effects of later processes should be compensated for. |
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| Keywords: | Author to whom correspondence should be addressed |
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