Radioelements, radiogenic helium and age relationships for groundwaters from the granites at Stripa, Sweden

Details Radioelements, radiogenic helium and age relationships for groundwaters from the granites at Stripa, Sweden Radioelements, radiogenic helium and age relationships for groundwaters from the granites at Stripa, Sweden

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1533a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 9, pp.1533-1543

Physics

8

Scientific paper

The solution of radioelements and radiogenic 4 He by groundwaters in fractured rocks is dependent upon the radioelement distribution in the rock matrix and the extent of the rock-water interface. The 234 U / 238 U activity ratio and the dissolved U, Rn and He contents of such groundwaters respond to changes in the flow regime with time. Although 234 U / 238 U activity ratios change with groundwater residence time as a consequence of 234 Th-recoil induced solution of 234 U, the activity ratio is strongly influenced by the U distribution within fractures, by the extent of the rock-water interface and by the amount of 238 U in solution. A model for the quantitative evaluation of these effects is presented. Groundwaters from depths up to 880 m in the Stripa granite have variable dissolved uranium contents and 234 U / 238 U activity ratios. The uranium geochemistry is primarily determined by variations in flow path rather than by groundwater age. Dissolved radiogenic 4 He in the groundwaters increases with their depth of origin, and is dependent upon the U content of the granite and upon its fracture porosity. It increases with groundwater residence time but movement of 4 He by diffusion and transport processes make the actual groundwater age indeterminate.

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