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The existing states and evolution of P and Fe in shallow sediments from the continental slope of northern South China Sea and their indication for the decomposition of gas hydrate

Abstract

天然气水合物作为当前极具开发潜力的新型清洁能源,受到科学界的广泛关注。海平面下降、洋壳的构造运动、海底沉积物滑塌及洋底水温变化等都可能造成天然气水合物的失稳分解,分解释放的CH4在垂向运移过程中与上层电子受体发生AOM,使SMTZ等作用带磷铁的赋存形态发生变化。磷作为海洋生物的重要营养元素,在海洋生物地球化学循环中有着重要意义,与铁、硫元素及沉积有机质关系紧密,在早期成岩过程中扮演了重要角色;而铁作为地壳中丰度最高的氧化还原敏感性金属元素,在海洋沉积物中的氧化还原过程对磷、硫、碳等生物地球化学重要元素的成岩循环都有重要影响。因此对南海北部陆坡沉积物中磷铁的赋存形态及演化规律的研究,不仅有助我们...Gas hydrates have been receiving extensive attention of the scientific community for their considerable exploration potential. Geological events like eustasy, tectonic movement of ocean crust, seabed sediment collapse and variation of bottom water temperature may cause the decomposition of gas hydrates, the released CH4 in this process reacts with upper electron acceptors(AOM) during upward migrat...学位:理学硕士院系专业:海洋与地球学院_海洋地质学号:2232013115143

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