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首页> 外文期刊>Materials science & engineering. C, Biomimetic and supramolecular systems >Pyrite crystallization in seep carbonates at gas vent and hydrate site
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Pyrite crystallization in seep carbonates at gas vent and hydrate site

机译：排气口和水合物部位渗碳碳酸盐中的黄铁矿结晶

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摘要

Pyrite formed by the synergistic metabolism of methane oxidizing archaea and sulfate reducing bacteria has been found in seep carbonates where hydrates usually occur in the subsurface and gas vents out from seafloor in many places worldwide. These bacteria collaborate to oxidize venting methane and reduce seawater sulfate. The hydrogen sulfide and carbon dioxide produced in this process causes pyrite and calcite crystallization (seep carbonate precipitation). We show, using the microscope analysis, that the pyrite crystallization has both bacterial fossilization and crystallization in seep carbonates collected from gas vent and hydrate sites off Louisiana Coast in the Gulf of Mexico and near Dongsha Island in the South China Sea. The pyrite shows bacterial and crystal forms scattered in the calcites. The crystal pyrite occurs as cubic crystals to construct framboid. The bacterial pyrite causes spheroids, rods in nanometer scale to aggregate to layered spheroids, rod-chains, and worm-like forms. These bacterial forms are identical to the characteristic form of live MOA/SRB colonies observed in gas vent and hydrate sites.
机译：由甲烷氧化的古细菌和硫酸盐还原菌的协同代谢形成的黄铁矿已发现在渗碳碳酸盐中，那里的水合物通常存在于地下，并且在世界各地很多地方都从海底排出气体。这些细菌协同氧化排出的甲烷并减少海水中的硫酸盐。在此过程中产生的硫化氢和二氧化碳引起黄铁矿和方解石结晶（深碳酸盐沉淀）。我们使用显微镜分析显示，黄铁矿结晶既有细菌化石，又有从渗碳碳酸盐中结晶的细菌，这些碳酸盐是从墨西哥湾路易斯安那州海岸和南海东沙岛附近的煤气出口和水合物位点收集的。黄铁矿显示出分散在方解石中的细菌和晶体形式。黄铁矿晶体以立方晶体形式存在，可构成黄酮。细菌黄铁矿会导致球状体，纳米级的棒聚集为分层的球状体，杆状链和蠕虫状形式。这些细菌形式与在排气孔和水合物位点中观察到的MOA / SRB活菌落的特征形式相同。

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