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- W1984658566 abstract "Exposures along the Algerita Escarpment record the depositional history of the San Andres Formation on the northern shelf of the Permian basin. Deposition began with a transgression over a restricted shelf and continued until outer shelf water depths were reached. The upper San Andres, however, marked an abrupt basinward shift of nearshore environments with multiple progradational cycles. Field analysis of the San Andres yielded detailed correlations based on such shallowing-upward cycles plus previously interpreted boundaries. Carbon and oxygen isotopic values were determined for 222 whole-rock samples (generally fine-grained dolomites). These data, plotted stratigraphically, were compared to the field correlations developed along the escarpment. The results delineate two major shifts in the carbon isotopic compositions of the San Andres carbonates. The lower of these changes in small enough to be explainable by local depositional or diagenetic factors. The upper zone of change, however, is of greater magnitude (+2.5-3{per thousand}), occurs across the entire study area, is independent of rock constituents, and continues well into the overlying strata. This upper San Andres isotopic shift may be the result of a regional or global excursion of seawater {delta}{sup 13}C and total dissolved carbon, as neither depositional nor diagenetic processes can account for suchmore » a large change in this interval. This interpretation is supported by (1) low organic carbon levels; (2) high sulfate levels; and (3) apparent early dolomitization preserving primary carbon values. All imply a rock-dominated carbon isotopic system. These results indicate that fluctuations in the carbon isotopic values on San Andres shelf dolomites may be a useful chemostratigraphic tool in the Permian basin.« less" @default.
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- W1984658566 date "1991-01-01" @default.
- W1984658566 modified "2023-09-26" @default.
- W1984658566 title "Carbon Isotopic Stratigraphy of the San Andres Formation--A Possible Correlation Tool?" @default.
- W1984658566 doi "https://doi.org/10.1306/20b23e62-170d-11d7-8645000102c1865d" @default.
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