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Subtidal Holocene Dolomite, Baffin Bay, Texas

1972; Society for Sedimentary Geology; Volume: Vol. 42; Linguagem: Inglês

10.1306/74d724c3-2b21-11d7-8648000102c1865d

1938-3681

Lynton S. Land E. William Behrens,

Geology and Paleoclimatology Research

ABSTRACT Laterally extensive dolomite beds seven to 12 meters below present sea level in Baffin Bay, Texas yield C14 ages of from 2,300 to 4,300 years B. P. and therefore must have formed subtidally. The one to five micron dolomicrites show no replacement textures and may have formed by direct precipitation. The dolomite is enriched approximately 3 permil in O18 over co-existing aragonite and Mg-calcite and contains approximately 800 ppm Sr. The Sr content of these dolomites is considerably higher than most ancient dolomites.