87Sr/86Sr ratios in Permo-Carboniferous sea water from the analyses of well-preserved brachiopod shells |
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| Affiliation: | 1. Clinical Research Unit, Brain and Mind Centre, University of Sydney, 100 Mallett Street, Camperdown, NSW 2050, Australia;2. Young Adult Mental Health Unit, Uspace, St Vincent''s Private Hospital, Australia;3. Sunshine Coast Mind and Neuroscience Thompson Institute, University of the Sunshine Coast, Birtinya, QLD, Australia |
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| Abstract: | Sr isotopic analyses of well-preserved portions of Permo-Carboniferous brachiopods distributed globally confirm the general shape of the Sr isotope age curve established by previous workers for this time interval. There is little variation between the Sr isotopic composition of unaltered portions of brachiopods and that of portions of the same shell interpreted to be diagenetically altered (based on cathodoluminescence, elemental, and stable isotopic data). However, the Sr isotopic composition in diagenetically altered micritic matrix adjacent to the shell is more radiogenic. The Sr isotopic composition in the unaltered portions of calcitic megafossils has potential as a stratigraphie tool. |
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