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• W1962093009 abstract "Abstract— 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 the 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 87 Sr, while other fractions corresponding to silicate phases produce a linear trend on a 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. An older isochron age of 4.481 ± 0.036 Ga with a low initial Sr isotopic ratio of 0.69866 ± 0.00038 was obtained for the data from silicate fractions of Khairpur, indicating early petrological equilibration on the parent body of EL6 chondrites." @default.
• W1962093009 created "2016-06-24" @default.
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• W1962093009 date "1993-09-01" @default.
• W1962093009 modified "2023-10-15" @default.
• W1962093009 title "Evidence for a late thermal event of unequilibrated enstatite chondrites: A Rb‐Sr study of Qingzhen and Yamato 6901 (EH3) and Khairpur (EL6)" @default.
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• W1962093009 doi "https://doi.org/10.1111/j.1945-5100.1993.tb00275.x" @default.
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