A Novel Approach for Inferring the Proportion of Terrestrial Organic Matter Input to Marine Sediments on the Basis of TOC:TN and δ<sup>13</sup>C<sub>org</sub> Signatures — Oak Academic Publishing
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A Novel Approach for Inferring the Proportion of Terrestrial Organic Matter Input to Marine Sediments on the Basis of TOC:TN and δ<sup>13</sup>C<sub>org</sub> Signatures
Department of Geochemistry, Petrobras Research Center, Rio de Janeiro, Brazil
,
Department of Sedimentology and Stratigraphy, Petrobras Research Center, Rio de Janeiro, Brazil
1 Department of Geochemistry, Petrobras Research Center, Rio de Janeiro, Brazil
2 Department of Sedimentology and Stratigraphy, Petrobras Research Center, Rio de Janeiro, Brazil
The ratio of total organic carbon to total nitrogen (TOC:TN) and the stable carbon isotope ratio of organic matter ( δ 13 C org ) are widely applied for inferring the origin of organic matter (OM) in Quaternary marine sediments. A plot of TOC:TN vs. δ 13 C org is useful for such studies but is strongly based on qualitative constraints. This study is based on the qualitative characterization of the source of Quaternary OM via analysis of TOC:TN and δ 13 C org signatures, but also proposes a probability parameter, which combines both signatures, to infer the amount of Terrestrial OM Input (TOMI). This index provides a method for quantifying the proportion of terrestrial OM vs. marine OMin a more comprehensive manner. The TOMI index concept was applied to a study area in theJoetsuBasin, eastern margin of theJapanSea, where previous studies have characterized theOMfrom the Last Glacial Maximum (LGM) to the present. The upwards increase in TOC indicates thatOMproduction during the Holocene was higher than during the LGM. The enriched δ 13 C org signature upwards and decrease in TOC:TN suggest predominantly marine phytoplankton OM during the Holocene. Throughout the LGM, low OM production with depleted δ 13 C org values and high TOC:TN values in the sediments suggest a predominantly C 3 terrestrial plant source for the OM. Using these data, it was possible to calculate a proxy for a sea level variation curve during that period and to investigate the influence of the proximity of the coastal line to the continental slope on the input of terrestrial material to the basin. The proposal provides information for the application of sequence stratigraphic concepts. The TOMI index could confirm that the proximity to the shoreline and shelf break has a strong influence on the input of terrestrial material during lowstand periods.
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Terrestrial Organic Matter Input
TOMI Index
TOC:TN
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