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Sr isotopes, hydrogeologic setting, and water-rock interaction in the Mt. Simon sandstone (Minnesota, USA)

Publication ,  Journal Article
Vinson, DS; Lundy, JR; Dwyer, GS; Vengosh, A
Published in: Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13
December 1, 2010

We present new 87Sr/ 86Sr ratios in groundwater from Proterozoic and Cambrian sandstone aquifers of southeastern Minnesota (USA), emphasizing the Mt. Simon aquifer. In Mt. Simon waters, 87Sr/ 86Sr ranges from 0.7141 in the recharge area to 0.7085 at depth. Sampling of the overlying Franconia, Ironton, and Galesville aquifers similarly indicates 87Sr/ 86Sr from 0.7132 in shallow conditions to 0.7086 at depth. Proterozoic sandstone aquifers in shallow bedrock conditions exhibit 87Sr/ 86Sr of 0.7103-0.7119. Sr sources to the Mt. Simon include: (1) more radiogenic Sr derived from overlying Cretaceous rocks and/or Pleistocene glacial deposits that incorporate Precambrian crystalline rocks and Cretaceous sedimentary rocks; and (2) less radiogenic Sr associated with Na-bearing waters, possibly from plagioclase weathering. Overall, the observed 87Sr/ 86Sr and correlation with carbon-14 activity record the Sr system's sensitivity to groundwater evolution from the recharge area to deep, slow-circulating areas and contributions from multiple Sr sources associated with hydrogeologic setting. © 2010 Taylor & Francis Group, London.

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Published In

Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13

Publication Date

December 1, 2010

Start / End Page

111 / 114
 

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Vinson, D. S., Lundy, J. R., Dwyer, G. S., & Vengosh, A. (2010). Sr isotopes, hydrogeologic setting, and water-rock interaction in the Mt. Simon sandstone (Minnesota, USA). Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13, 111–114.
Vinson, D. S., J. R. Lundy, G. S. Dwyer, and A. Vengosh. “Sr isotopes, hydrogeologic setting, and water-rock interaction in the Mt. Simon sandstone (Minnesota, USA).” Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13, December 1, 2010, 111–14.
Vinson DS, Lundy JR, Dwyer GS, Vengosh A. Sr isotopes, hydrogeologic setting, and water-rock interaction in the Mt. Simon sandstone (Minnesota, USA). Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13. 2010 Dec 1;111–4.
Vinson, D. S., et al. “Sr isotopes, hydrogeologic setting, and water-rock interaction in the Mt. Simon sandstone (Minnesota, USA).” Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13, Dec. 2010, pp. 111–14.
Vinson DS, Lundy JR, Dwyer GS, Vengosh A. Sr isotopes, hydrogeologic setting, and water-rock interaction in the Mt. Simon sandstone (Minnesota, USA). Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13. 2010 Dec 1;111–114.

Published In

Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13

Publication Date

December 1, 2010

Start / End Page

111 / 114