Stable carbon isotope ratio variations of organic matter in Orca Basin sediments |
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| Authors: | Mark A Northam David J Curry Richard S Scalan Patrick L Parker |
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| Affiliation: | The University of Texas, Marine Science Institute, Port Aransas Marine Laboratory, Port Aransas, TX 78373, U.S.A. |
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| Abstract: | Orca Basin is a highly reducing basin on the slope of the Gulf of Mexico. Stable carbon isotope ratios and total organic carbon percentages were determined for two cores within the basin and one control core outside the basin. The results show that the organic carbon content of the basin cores is consistently 2–3 times greater than that of the control core. The Pleistocene-Holocene boundary, indicated by a break in the δ13C depth profile, occurs at a greater sediment depth in the basin cores than in the control core. A small sampling interval has made it possible to detect an unexplained fine structure in the δ13C profile not previously observed. |
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