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- W2000940149 abstract "Cosmogenic and radiogenic rare gases were determined by mass spectrometry in 16 amphoterites. The radiation, U, Th-He, and K-Ar ages were calculated. Radiation ages of amphoterites vary from 0.9 to 58 m.y. They resemble the age distribution of the hypersthene chondrites in that few amphoterites have ages in the interval 2–6 m.y. The amphoterites Appley Bridge, Hamlet, and Soko-Banja have the same fall date, October 13, but very different radiation ages—1, 31, and 58 m.y.—indicating that they did not belong to a periodic meteorite shower or stream. The same seems to be true also of Olivenza and Vavilovka, both of which fell on June 19. The Ar40 contents of 4 amphoterites differ significantly from previous determinations by other authors, a finding that supports earlier conclusions that the K abundance in some amphoterites seems to be nonuniform. Although 2 of the amphoterites had U, Th-He ages as short as 1 b.y., most others are indeed quite old. Seventy-five per cent have ages greater than 3.0 b.y., whereas only 20% of the hypersthene chondrites have ages above this limit. It is concluded that differences in chemistry and mineralogy cannot account for the systematic differences in gas-retention ages of bronzite, hypersthene, and amphoteric chondrites. Most, if not all, amphoterites seem to have escaped the reheating episode that hypersthene chondrites underwent late in their history." @default.
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- W2000940149 date "1965-08-01" @default.
- W2000940149 modified "2023-10-10" @default.
- W2000940149 title "Cosmogenic and radiogenic helium, neon, and argon in amphoteric chondrites" @default.
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- W2000940149 doi "https://doi.org/10.1029/jz070i015p03735" @default.
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