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• W2142709301 endingPage "2388" @default.
• W2142709301 startingPage "2375" @default.
• W2142709301 abstract "We have determined the calcium carbonate (CaCO3), organic carbon (Coorg), trace element, and rare earth element (REE) composition of surface sediments collected from a transect on the central western continental shelf and slope of India in the Eastern Arabian Sea. The transect samples across the oxygen minimum zone (OMZ) allows us to compare the relative abundances of trace elements and REEs in the sediments beneath and beyond the OMZ. Shale-normalized REE patterns, Lan/Ybn ratios, and Eu/Eu∗ anamolies indicate that the sediments in the study area are either derived from the adjoining Archaean land masses or from distal Indus source. Sediment deposited in the OMZ have high U values from 3.6 to 8.1 ppm, with their Uexcess (of that can be supplied by continental particles) values ranging between 82–91% of the total U, indicating that the U may be precipitated as U+4 in the reducing conditions of OMZ. Sediments deposited beneath the intense OMZ (<0.2 mL/L) and away from the OMZ (1–2 mL/L) show slight negative Ce anomalies, with no significant differences between these two sets of sediments. The Ce/Ceshale∗ values are poorly related to U and Corg which are indicators of suboxic bottom waters. Normative calculations suggest that two sources, namely, terrestrial and seawater (terrestrial ⪢ seawater) contribute to the total Cc anomaly of the sediments. The Cc anomaly values of the calculated seawater derived component are similar to the anomalies reported for other coastal waters and the oxygenated surface waters of the Arabian Sea and do not show any correspondence to the lowered redox state of the overlying water, probably due to the redirection of dissolved Ce into the oxic deeper water. This data on recently deposited sediments from a known oxygen-poor environment suggest that the Ce/Cesh∗ in high sedimentation areas of continental margin environments may not be a good paleoredox proxy. U/Th ratios above 1.25 noticed in OMZ are in accordance with the earlier usage of this ratio for identifying reducing environment of ancient sediments." @default.
• W2142709301 created "2016-06-24" @default.
• W2142709301 creator A5006466120 @default.
• W2142709301 creator A5066918983 @default.
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• W2142709301 creator A5091367081 @default.
• W2142709301 date "1997-06-01" @default.
• W2142709301 modified "2023-10-11" @default.
• W2142709301 title "Trace and rare earth elemental variation in Arabian Sea sediments through a transect across the oxygen minimum zone" @default.
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• W2142709301 doi "https://doi.org/10.1016/s0016-7037(97)00094-x" @default.
• W2142709301 hasPublicationYear "1997" @default.
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