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Geology; April 2004; v. 32; no. 4; p. 289-292; DOI: 10.1130/G20081.2
© 2004 Geological Society of America
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Alabama Gulf Coast groundwaters: 4He and 14C as groundwater-dating tools

Anne E. Carey1, Carolyn B. Dowling*,2 and Robert J. Poreda*,2

1 Department of Geological Sciences, Ohio State University, Columbus, Ohio 43210-1398, USA
2 Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, USA

Analyses of 4He and 14C in groundwaters from a Miocene quartz aquifer on the Alabama Gulf Coast show the usefulness of 4He for dating these Holocene groundwaters. In this aquifer system of low alkalinities and low pHs, radiocarbon ages can be used without model correction. The groundwaters studied ranged from 42.3% to 95.5% modern carbon and yielded uncorrected ages of 375–6790 yr. Radiogenic 4He ages ranged from >50–7500 yr.

Key Words: groundwater • age dating • 4He • 14C • Baldwin County Alabama






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