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首页> 外文期刊>Geosciences >Molecular and Isotopic Composition of Hydrate-Bound, Dissolved and Free Gases in the Amazon Deep-Sea Fan and Slope Sediments, Brazil
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Molecular and Isotopic Composition of Hydrate-Bound, Dissolved and Free Gases in the Amazon Deep-Sea Fan and Slope Sediments, Brazil

机译：巴西亚马逊深海扇和斜坡沉积物中水合物结合，溶解和游离气体的分子和同位素组成

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In this work, we investigated the molecular stable isotope compositions of hydrate-bound and dissolved gases in sediments of the Amazon deep-sea fan and adjacent continental slope, Foz do Amazonas Basin, Brazil. Some cores were obtained in places with active gas venting on the seafloor and, in one of the locations, the venting gas is probably associated with the dissociation of hydrates near the edge of their stability zone. Results of the methane stable isotopes (δ 13 C and δD) of hydrate-bound and dissolved gases in sediments for the Amazon fan indicated the dominant microbial origin of methane via carbon dioxide reduction, in which 13 C and deuterium isotopes were highly depleted (δ 13 C and δD of ?102.2% to ?74.2% V-PDB and ?190 to ?150% V-SMOW, respectively). The combination of C1/(C2+C3) versus δ 13 C plot also suggested a biogenic origin for methane in all analysed samples (commonly 1000). However, a mixture of thermogenic and microbial gases was suggested for the hydrate-bound and dissolved gases in the continental slope adjacent to the Amazon fan, in which the combination of chemical and isotopic gas compositions in the C1/(C2+C3) versus δ 13 C plot were 100 in one of the recovered cores. Moreover, the δ 13 C-ethane of ?30.0% indicates a thermogenic origin.
机译：在这项工作中，我们研究了巴西亚马逊深海扇和邻近大陆坡沉积物中水合物结合和溶解气体的分子稳定同位素组成。在海底有活性气体排放的地方获得了一些岩心，在其中一个位置，排放气体可能与水合物在其稳定区边缘附近的离解有关。亚马逊扇形沉积物中与水合物结合和溶解的气体中甲烷稳定同位素（δ13 C和δD）的结果表明，通过二氧化碳还原甲烷是甲烷的主要微生物来源，其中13 C和氘同位素高度贫化（δ 13 C和δD分别为〜102.2％至〜74.2％V-PDB和〜190至〜150％V-SMOW。 C1 /（C2 + C3）与δ13 C曲线的组合也暗示了所有分析样品中甲烷的生物成因（通常> 1000）。但是，对于与亚马逊扇形相邻的大陆斜坡中与水合物结合和溶解的气体，建议使用生热气体和微生物气体的混合物，其中化学气体和同位素气体的组合在C1 /（C2 + C3）中相对于δ在一个已回收的岩心中，13 C图小于100。另外，δ13 C-乙烷约为30.0％表示产热源。

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