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• W1969209251 abstract "Ground waters in a Precambrian granitic batholith at the Whiteshell Nuclear Research Establishment (WNRE) in Pinawa, Manitoba contain between 5 × 10−5 and 10−1 cc STP/gH2O of radiogenic helium-4 but have relatively uniform 3He/4He ratios of between 0.6 × 10−8 and 2.3 × 103. The highest helium samples also contain radiogenic 21,22Ne produced by (α,n) or (n,α) reactions with other isotopes. As much as 1.8 × 10−9ccSTP/gH2O of excess 21Ne and 3.8 × 10−9ccSTP/gH2O of excess 22Ne have been measured. Helium and 21Ne ages of these ground waters, calculated on the basis of known crustal production rates of 4He and 21Ne, are unreasonably high (up to 2 × 105 years) and incompatible with the 14C ages and other isotopic and hydrogeologic data. Uranium enrichment in the flow porosity of the granite may dominate 4He and 21,22Ne production in this granite and mask the contributions from more typical U and Th concentrations in the rock matrix. At the Chalk River Nuclear Laboratories in Ontario helium concentrations in ground waters in a Precambrian monzonitic gneiss range from 1.5 × 10−7 to 8.7 × 10−4ccSTP/gH2O with the 3He/4He ratios ranging from 2.0 × 10−3 to 1.5 × 10−7. The highest helium concentrations may be attributable to the presence of a thick uraniferous pegmatite vein and yield helium ages more than two orders of magnitude higher than the 14C ages. Application of He age dating equations to ground waters from Precambrian granitic rocks requires knowledge of the nature of uranium and thorium enrichment in the subsurface in order to select appropriate values for porosity and uranium and thorium concentration in the rock." @default.
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• W1969209251 date "1984-10-01" @default.
• W1969209251 modified "2023-10-16" @default.
• W1969209251 title "Helium and neon isotope geochemistry of some ground waters from the Canadian Precambrian Shield" @default.
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• W1969209251 doi "https://doi.org/10.1016/0016-7037(84)90379-x" @default.
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