1,200-Myr impact-melting age and trace-element chemical features of the Yamato-790964 chondrite

Details 1,200-Myr impact-melting age and trace-element chemical features of the Yamato-790964 chondrite 1,200-Myr impact-melting age and trace-element chemical features of the Yamato-790964 chondrite

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.315..563n&link_type=abstract

Nature (ISSN 0028-0836), vol. 315, June 13, 1985, p. 563-566.

Computer Science

7

Meteorites, Antarctic Meteorites, Yamato Meteorites, Impacts, Melting, Age, Trace Elements, Chemistry, Yamato 790964, Ll Chondrites, History, Evolution, Dating Methods, Lithophiles, Isochrons, Fractionation

Scientific paper

Age determinations of impact-produced materials in brecciated meteorites are particularly important for understanding the evolutionary history of meteorites. The age characteristics of these meteorites have been examined mostly by the K-Ar method or, in a few cases, by the Rb-Sr method. However, age data are still rare and, except for a few cases, the large-ion lithophile (LIL) trace-element chemical features have not been studied in detail. In this respect, the Yamato-79 shocked meteorites are the best specimens for investigation. Results of Rb-Sr systematics and trace-element analyses for an almost wholly impact-melted LL-chondrite, Y-790964, one of the Yamato-79 unusual chondrites are reported. The analyses yield an internal isochron age of 1200 + or - 50 (2-sigma) Myr. The isotopic and trace-element data obtained represent the first clear evidence of the youngest impact-melting and LIL-element fractionations for a complete LL-chondrite, and suggest that the 1200-Myr-age is a nontrivial marker in the evolution of meteorites.

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