TY - GEN
T1 - Sr isotopes, hydrogeologic setting, and water-rock interaction in the Mt. Simon sandstone (Minnesota, USA)
AU - Vinson, D. S.
AU - Lundy, J. R.
AU - Dwyer, G. S.
AU - Vengosh, A.
PY - 2010/12/1
Y1 - 2010/12/1
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/84860181101
M3 - Conference contribution
AN - SCOPUS:84860181101
SN - 9780415604260
T3 - Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13
SP - 111
EP - 114
BT - Water-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13
T2 - 13th International Conference on Water-Rock Interaction, WRI-13
Y2 - 16 August 2010 through 20 August 2010
ER -