Evidence for dilution of deep, confined ground water by vertical recharge of isotopically heavy Pleistocene water

D. I. Siegel

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

New analyses of the isotopic composition of water, 14 C-dating of dissolved inorganic carbon, and order-of-magnitude Darcy calculations suggest that a dilute body of water, trending north-south in the Cambrian-Ordovician aquifer of Iowa, was emplaced as vertical recharge of Pleistocene-age water from the base of the Des Moines lobe of late Wisconsin time. The recharge occurred through more than 300 m of overlying Silurian to Mississippian age rocks. I suggest that 1) the climate at the end of the last glaciation was mild and 2) a ground-water stable isotope signature similar to that of modern precipitation in an aquifer's recharge area is not a priori evidence for relatively recent recharge. -from Author

Original languageEnglish (US)
Pages (from-to)433-436
Number of pages4
JournalGeology
Volume19
Issue number5
DOIs
StatePublished - Jan 1 1991

ASJC Scopus subject areas

  • Geology

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