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首页> 外文期刊>Marine Geology >Application of lipid biomarkers to detect sources of organic matter in mud volcano deposits and post-eruptional methanotrophic processes in the Gulf of Cadiz, NE Atlantic
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Application of lipid biomarkers to detect sources of organic matter in mud volcano deposits and post-eruptional methanotrophic processes in the Gulf of Cadiz, NE Atlantic

机译：脂质生物标志物在东北大西洋加的斯湾的泥火山沉积和喷发后的甲烷营养化过程中检测有机物来源的应用

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The Gulf of Cadiz is known as an active mud volcano (MV) and fluid venting region discovered during the Training Through Research (TTR) expeditions in 1999 (TTR-9). Here we report a study of lipid biomarkers in the mud breccia matrix from three MVs in this region. The lipid biomarker composition revealed strong compositional resemblance as well as similar thermal maturity properties for the studied MVs. This indicates that the primary source of the erupted material for these MVs is located in similar litho-stratigraphic units. In both areas, upward migrated fluid went through the sedimentary series of the allochthonous Olistrostrome and through the Upper Cretaceous horizons. The relatively immature characteristics of organic matter from both mud breccia rock clasts and matrix together with the more mature properties of hydrocarbon gases from the same sampling locations indicate that source-strata for the initial fluid are located deeper in the subsurface than the source-strata for the erupted sedimentary material. The presence of microbial lipid biomarkers derived from archaea and sulfate reducing bacteria in the mud breccias revealed anaerobic oxidation of methane (AOM) as a dominant microbial process in these habitats. Our data suggest that the AOM-derived lipids are, at least in part, fossil in origin (i.e. they do not reflect active AOM communities) and thus reflect AOM activity in these MVs integrated over time. The low concentrations of AOM-related biomarkers in these MVs suggest relatively low intensities of AOM in the studied MV deposits. The distribution of biomarkers suggests an abrupt and brief cold seep activity in the past and the absence of a continuous methane influx in the studied locations.
机译：加的斯湾被称为活动泥火山（MV）和流体排出区域，该区域是在1999年通过研究训练（TTR）进行的探险（TTR-9）中发现的。在这里，我们报告了在该地区的三个MV的泥角砾岩基质中脂质生物标志物的研究。对于研究的MV，脂质生物标志物的组成显示出很强的组成相似性以及相似的热成熟特性。这表明这些MV的喷发物质的主要来源位于相似的岩石地层学单元中。在这两个地区，向上迁移的流体都经过了异源奥利斯特罗斯特伦的沉积系列和上白垩统地层。泥浆角砾岩碎屑和基质中有机物的相对不成熟特征，以及来自相同采样位置的烃类气体的更成熟的特性表明，初始流体的源地层比地下的源地层更深。喷出的沉积物质。泥角砾岩中源自古细菌和硫酸盐还原细菌的微生物脂质生物标志物的存在表明，甲烷（AOM）的厌氧氧化是这些生境中的主要微生物过程。我们的数据表明，AOM衍生的脂质至少部分是化石来源的（即它们不反映活跃的AOM群落），因此反映了随着时间推移这些MV中AOM的活性。这些MV中低浓度的AOM相关生物标志物表明所研究的MV沉积物中AOM的强度相对较低。生物标志物的分布表明，过去曾发生过短暂而短暂的冷渗漏活动，并且在研究的地点没有连续的甲烷涌入。

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