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Science 24 December 1993:
Vol. 262. no. 5142, pp. 2016 - 2020
DOI: 10.1126/science.262.5142.2016
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Articles

Stable Isotope Enrichment in Paleowaters of the Southeast Atlantic Coastal Plain, United States

L. Niel Plummer 1

1 U.S. Geological Survey, Reston, VA 22092

Paleowaters from the Floridan aquifer system in the southeastern Atlantic coastal plain have higher D/H and 18O/16O ratios than local Holocene ground water. Maximum dgr18O enrichments in ground water having adjusted radiocarbon ages of 20,000 to 26,000 years are 0.7 to 2.3 per mil. The trend in isotopic enrichment in paleowaters is the reverse of that normally observed in continental glacial age ground water. Dissolved nitrogen and argon concentrations indicate, however, that the average recharge temperature was 5.3°C cooler than that today. The data indicate cool conditions in the southeast Atlantic coastal plain during the last glacial maximum, with recharge limited primarily to late summer tropical cyclones and hurricanes.

Submitted on July 14, 1993
Accepted on October 15, 1993


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