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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico - A combined optical and biomarker approach
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Glacial to Holocene terrigenous organic matter input to sediments from Orca Basin, Gulf of Mexico - A combined optical and biomarker approach

机译：冰川到全新世陆生有机质输入墨西哥湾奥卡盆地的沉积物中-光学和生物标志物组合方法

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In this study we assessed changes in the contribution of terrigenous organic matter (OM) to the Gulf of Mexico over the course of the last deglaciation (the last 25 kyr). To this end, we combined optical kerogen analyses with bulk sedimentary, biomarker, and compound-specific Carbon isotope analyses. Samples were obtained from core MD02-2550 from Orca Basin (2249 in water depth at 26 degrees 56.77N, 91 degrees 20.74W) with temporal resolution ranging from multi-decadal to millennial-scale, depending on the proxy. All proxies confirmed larger terrigenous input during glacial times compared to the Holocene. In addition, the kerogen analyses suggest that much of the glacial OM is reworked (at least 50% of spores and pollen grains and 40% of dinoflagellate cysts). The Holocene sediments, in contrast, contain mainly marine OM, which is exceptionally well preserved. During the deglaciation, terrigenous input Was generally high due to large meltwater fluxes, whereby discrepancies between different proxies call for additional influences, Such as the change in distance to the river mouth, local productivity changes, and hydrodynamic particle sorting. It is possible that kerogen particles and the terrigenous biomarkers studied here represent distinct pools of land-derived OM with inputs varying independently.
机译：在这项研究中，我们评估了最后一次冰消期（最后25年）中陆生有机质（OM）对墨西哥湾的贡献的变化。为此，我们将光学干酪根分析与大量沉积物，生物标志物和化合物特异性碳同位素分析相结合。样品取自Orca盆地的MD02-2550岩心（水深2249，深度26度56.77N，91度20.74W），时间分辨率范围从数十年代到千年级，具体取决于代理。与全新世相比，所有代理人都证实了冰川时期的陆源输入更大。此外，干酪根分析表明，许多冰原都经过了改造（至少50％的孢子和花粉粒和40％的鞭毛囊肿）。相比之下，全新世沉积物主要包含海洋OM，其保存得非常好。在冰消冰期间，由于较大的融水通量，陆源输入通常较高，因此不同代理之间的差异需要附加影响，例如到河口的距离变化，局部生产力的变化以及流体动力颗粒的分类。此处研究的干酪根颗粒和陆生生物标记物可能代表了不同来源的土地衍生OM的不同库。

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