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      Data report: elemental, isotopic, and Rock-Eval compositions of bulk sediments from Hole U1357A in the Adélie Basin, Antarctica: Expedition 318

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      Proceedings of the IODP
      Integrated Ocean Drilling Program

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          Abstract

          We examined the elemental (total nitrogen, total organic carbon, and C/N), isotopic (δ<sup>13</sup>C<sub>org</sub> and δ<sup>15</sup> N<sub>org</sub> ), and Rock-Eval pyrolysis (S<sub>2</sub>, S<sub>3</sub>, hydrogen index, oxygen index, and T<sub>max</sub> ) compositions of bulk marine sediments from Hole U1357A in the Adelie Basin, Antarctica, to assess the organic geochemical characteristics and vertical variations in the late Holocene diatomaceous-dominated sediments. Pyrolysis parameters indicate that most of the organic materials are immature and in the Type II stage, indicative of a marine source. In contrast, the results from a conventional cross-plot of δ<sup>13</sup>C<sub>org</sub> vs. total organic carbon/total nitrogen indicate organic materials that originated as freshwater organic carbon, not marine organic carbon. Given that <sup>13</sup>C-depleted phytoplankton are dominant in diatomaceous ooze-rich sediments of the Adelie Basin, the apparent dominance of freshwater organic matter is likely attributable to the extremely low δ<sup>13</sup>C<sub>org</sub> (ppm) values in the bulk sediments.

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          Most cited references13

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          Nitrogen and carbon isotopic composition of bone collagen from marine and terrestrial animals

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            Méthode rapide de caractérisation des roches mètres, de leur potentiel pétrolier et de leur degré d'évolution

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              Correlation of carbon and nitrogen stable isotope ratios in sedimentary organic matter 1

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                Author and article information

                Journal
                10.2204/iodp.proc.318.2011
                Proceedings of the IODP
                Integrated Ocean Drilling Program
                1930-1014
                14 October 2014
                Article
                10.2204/iodp.proc.318.201.2014
                528e0c27-9a58-479a-9fb5-3204853ddd60

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History

                Earth & Environmental sciences,Oceanography & Hydrology,Geophysics,Chemistry,Geosciences

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