Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..515t&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 28, no. 4, p. 515-527.
Other
11
Chemical Composition, Chondrites, Enstatite, Petrology, Chemical Analysis, Chronology, Isotopes
Scientific paper
The Rb-Sr whole rock and internal systematics of two EH3 chondrites, Qingzhen and Yamato 6901, and of one EL6 chondrite, Khairpur, were determined. Sulfides were separated using a stepwise dissolution technique. The mineral species in each fraction were estimated based on chemical analyses of 12 major elements. The internal Rb-Sr systematics of the EH3 chondrites are highly disturbed. Fractions corresponding to sulfide phases show excess Sr-87, while other fractions corresponding to silicate phases produce a linear trend on an Rb-Sr evolution diagram. If these linear relations are interpreted as isochrons, the ages of the silicate phases are 2.12 +/- 0.23 Ga and 2.05 +/- 0.33 Ga with the initial Sr isotopic ratios of 0.7112 +/- 0.0018 and 0.7089 +/- 0.0032, for Qingzhen and Yamato 6901, respectively. The process of the isotopic disturbance probably involved the breakdown of the major K-bearing sulfide (djerfisherite), and a lack of isotopic exchange between sulfide and silicate phases indicates moderate temperatures of reheating. Although a complete Sr isotopic re-homogenization among silicate phases was not attained, we interpret the Rb-Sr results as indicative of a late thermal event about 2 Ga ago on the parent bodies of these EH3 chondrites. These ages agree well with previously published K-Ar ages.
Shima Masako
Torigoye Noriko
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