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- W2080872913 abstract "Abstract— Age patterns observed in meteorite groups reflect the different thermal or impact histories experienced by their parent bodies. To assess the number of ordinary chondrite (OC) parent bodies rare-gas data in the Schultz and Kruse (1989) data base were used to calculate U,Th-He gas-retention ages. Most H- and LL-chondrite ages are high; ∼81% are >2.2 Ga. In contrast, most L-chondrite ages are low; ∼69% are ≤2.2 Ga, and ∼35% are ≤0.9 Ga. The latter fraction is substantially lower than the value of 44% given by Heymann (1967). The difference is attributed to the preferential inclusion of shocked L chondrites in early studies. Broad age peaks in the H and LL groups near 3.4 Ga probably reflect thermal loss during metamorphism, but in the H distribution there is a hint of minor outgassing “events” near 1 Ga. The L/LL chondrites have chemical properties intermediate between and unresolvable from L and LL chondrites. The high ages of most L/LL chondrites are evidence against these originating on the L parent body; the L/LL age distribution is consistent with an origin on the LL parent body or on an independent body." @default.
- W2080872913 created "2016-06-24" @default.
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- W2080872913 date "1991-06-01" @default.
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- W2080872913 title "The histories of ordinary chondrite parent bodies: U,Th-He age distributions" @default.
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- W2080872913 doi "https://doi.org/10.1111/j.1945-5100.1991.tb01033.x" @default.
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