Strontium isotopic composition of the Madera Formation (Pennsylvanian) near Albuquerque,New Mexico |
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| Authors: | Bimal Mukhopadhyay DG Brookins |
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| Institution: | Department of Geology, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A. |
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| Abstract: | 87Sr/86Sr ratios of fourteen unaltered limestone and six fossil samples show a range of 0.7066-0.7118 for the depositional water of the Middle to Upper Pennsylvanian Madera Formation. The variation of these 87Sr/86Sr ratios may be due to the restricted depositional basin and nature of the source of the Madera Formation.While fossil and limestone samples are equally good for determination of strontium isotopic composition of depositional waters, leaches of calcareous shales contain significant amount of 87Sr leached from the noncarbonate fraction during acid treatment. |
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