Uranium series dating of stalagmites from Blanchard Springs Caverns, U.S.A.

Details Uranium series dating of stalagmites from Blanchard Springs Caverns, U.S.A. Uranium series dating of stalagmites from Blanchard Springs Caverns, U.S.A.

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1211t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 9, pp.1211-1212

Physics

1

Scientific paper

Because stalagmites are enriched in 234 U beyond the equilibrium value at the time of deposition, they are potentially datable by measuring their progress toward equilibrium. Procedures for uranium-thorium and uranium disequilibrium dating of speleothems were developed, making use of alpha spectrometry for thorium determinations and mass spectrometry for uranium determinations. The stalagmites tested were generally beyond the age range of the U-Th age dating method and, as a result, 234 U/ 238 U ratios provided the most useful dating technique. The estimated age range for a stalagmite from Blanchard Springs is 135,000 to 785,000 years BP with an interval of slow or suspended growth from about 320,000 to 570,000 years BP.

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