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- W2029486428 abstract "Abstract Age determinations have been made on various minerals from the Bob Ingersoll pit No. 1. The uranium-lead ages agree at 1600 m.y., Rb-Sr ages of microcline, muscovite and lepidolite are all about 2050 m.y., probably indicating that the currently accepted Rb decay-constant is incorrect. K-A ages of the micas are in fairly good agreement with U-Pb ages when a K40 branching ratio of 0.100 is used. The K-A age of the microcline is definitely lower, probably indicating loss of argon from this mineral." @default.
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- W2029486428 date "1956-06-01" @default.
- W2029486428 modified "2023-10-03" @default.
- W2029486428 title "New determinations of the age of the Bob Ingersoll pegmatite, Keystone S. Dakota" @default.
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- W2029486428 doi "https://doi.org/10.1016/0016-7037(56)90030-8" @default.
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