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- W13806809 abstract "Research over the past 20 years has revealed thick sequences of dolomite beneath the Bahamian platform. Various mechanisms of dolomitization have been suggested for these rocks, but the timing of their formation remains enigmatic. In an attempt to establish the approximate time and thereby constrain the mode of dolomitization, Sr-isotope measurements have been made throughout the limestone and dolomite intervals of a core from San Salvador in the Bahamas; the sediments in this core are Pleistocene to Miocene in age. The Sr isotope results indicate that dolomitization of the Pliocene portion of the San Salvador core occurred during Pleistocene times or later, as the /sup 87/Sr//sup 86/Sr ratios are indistinguishable from modern seawater (0.70920 - 0.70910). Sediments of Miocene age which have been dolomitized, possessed slightly less radiogenic values, and therefore may have either been dolomitized at an earlier age of contain a larger proportion of strontium derived from the original sediment. The limestones at the top and bottom of the core have /sup 87/Sr/sup 86/Sr ratios which are appropriate for their assigned biostratigraphic age. Ignoring the possibility of contamination from continental Sr, these data do not support dolomitization of the sediments contemporaneous with deposition, but rather indicate that dolomitizationmore » occurred during the past million years or perhaps even more recently.« less" @default.
- W13806809 created "2016-06-24" @default.
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- W13806809 date "1985-01-01" @default.
- W13806809 modified "2023-10-18" @default.
- W13806809 title "Interpretation of Cenozoic dolomitization in the Bahamas using Sr-87/Sr-86 ratios" @default.
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