Sr Isotopes, Hydrogeologic Setting, and Water-Rock Interaction in the Mt. Simon Sandstone (Minnesota, USA)

D. S. Vinson, J. R. Lundy, G. S. Dwyer, A. Vengosh

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish
Title of host publicationWater-Rock Interaction: Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13
PublisherCRC Press
Pages111-114
Number of pages4
ISBN (Electronic)9781439862995
ISBN (Print)9780415604260
StatePublished - 1 Dec 2010
Externally publishedYes

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