Chondrite chronology by initial Sr-87/Sr-86 in phosphates?

Details Chondrite chronology by initial Sr-87/Sr-86 in phosphates? Chondrite chronology by initial Sr-87/Sr-86 in phosphates?

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991metic..26..145p&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 26, June 1991, p. 145-152.

Computer Science

10

Chondrites, Meteoritic Composition, Phosphates, Radioactive Age Determination, Strontium Isotopes, Abundance, Rubidium, Solar System Evolution

Scientific paper

New data are presented on Rb-Sr isotope analyses of phosphates from nine ordinary chondrites, including accurate identification of initial Sr-87/Sr-86. The initial Sr-87/Sr-86 ratios found in this study were generally significantly higher than the more primitive initial Sr-87/Sr-86 ratios inferred for carbonaceous chondrite refractory inclusions, basaltic achondrites, or bulk ordinary chondrites. Such elevation of initial Sr-87/Sr-86 is generally considered to reflect isotopic redistribution during metamorphism. However, in this study, no evident correlation was found between the phosphate initial Sr-87/Sr-86 compositions and the metamorphic grade. Two possible alternative hypotheses for high initial Sr-87/Sr-86 ratios are considered.

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