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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Geochemical Evidence of Metal-Driven Anaerobic Oxidation of Methane in the Shenhu Area the South China Sea
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Geochemical Evidence of Metal-Driven Anaerobic Oxidation of Methane in the Shenhu Area the South China Sea

机译：南海神湖地区甲烷金属驱动的厌氧氧化的地球化学证据

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Anaerobic oxidation of methane (AOM) is a common biochemical process in the ocean and it plays an important role in global climate change, elemental circulation, and atmospheric evolution over geological time. In this paper, we analyzed of δ34S, Fe, Mn, Ca/Ti, and Sr/Ti ratios, and the date of carbon and sulfur from the site SH3 of Shenhu area. Result showed that (1) 0–6 mbsf (meter blow the sea floor) was mainly affected by OSR (anaerobic oxidation of organic matters) and 7–15 mbsf was a paleo-SMTZ (sulfate–methane transition zone) position. The modern SMTZ was mainly distributed at 19–25 mbsf. The barium sulfate precipitation above the modern SMTZ indicating that the current methane leakage was stable and lasted longer during geological history. (2) By studying the change of magnetic and the different carbonate minerals, results showed that there were two AOM stages. During the early stage, Fe2+ were mainly produced by sulfide abiotic reductive dissolution. During the later stage, Fe2+ were mainly produced by the metal-AOM. (3) Study of the mineral characteristics of the paleo-SMTZ and the modern SMTZ showed that the modern SMTZ carbonate minerals were mainly low-Mg calcite and aragonite, while the paleo-SMTZ carbon minerals were mainly high Mg minerals. The reason for this difference is that the modern SMTZ layer was only experienced the first stage of anaerobic oxidation of methane. In the paleo-SMTZ layer, it has experienced two stage of anaerobic oxidation of methane. During the last stage of metal-AOM, the low Mg carbonate minerals were converted into high Mg carbonate minerals. This research confirms the presence of metal-driven methane anaerobic oxidation at the bottom of sulfate-driven methane anaerobic oxidation and during the metal-driven methane anaerobic oxidation, methane and metal oxides or hydroxides would couple to convert the in situ metal oxides or hydroxides into metal ions, meanwhile the phosphorus adsorbed on the surface of the metal oxides is released into adjacent pore water, and convert to new P-bearing minerals under suitable conditions.
机译：甲烷厌氧氧化（AOM）是海洋中常见的生化过程，它在全球气候变化，元素循环以及地质时期的大气演变中起着重要作用。本文分析了神户地区SH3站点的δ 34 S，Fe，Mn，Ca / Ti和Sr / Ti比率，以及碳和硫的含量。结果表明：（1）0–6 mbsf（海底以下风）主要受OSR（有机物的厌氧氧化）影响，而7–15 mbsf是古SMTZ（硫酸盐-甲烷过渡带）位置。现代的SMTZ主要分布在19–25 mbsf。现代SMTZ上方的硫酸钡沉淀表明，当前的甲烷泄漏在地质历史过程中是稳定的，持续的时间更长。 （2）通过研究磁性和不同碳酸盐矿物的变化，结果表明存在两个AOM阶段。在早期阶段，Fe 2 + 主要是由硫化物非生物还原还原产生的。在后期，Fe 2 + 主要由金属AOM产生。 （3）对古SMTZ和现代SMTZ矿物特征的研究表明，现代SMTZ碳酸盐矿物主要是低镁方解石和文石，而古SMTZ碳矿物主要是高Mg矿物。造成这种差异的原因是，现代的SMTZ层仅经历了甲烷厌氧氧化的第一阶段。在古SMTZ层中，它经历了甲烷的厌氧氧化两个阶段。在金属AOM的最后阶段，将低镁碳酸盐矿物转化为高镁碳酸盐矿物。这项研究证实了在硫酸盐驱动的甲烷厌氧氧化的底部存在金属驱动的甲烷厌氧氧化，在金属驱动的甲烷厌氧氧化的过程中，甲烷和金属氧化物或氢氧化物会结合将原位金属氧化物或氢氧化物转化为同时，吸附在金属氧化物表面的磷会释放到相邻的孔隙水中，并在合适的条件下转化为新的含P矿物。

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