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地球科学进展  2013, Vol. 28 Issue (7): 765-773    DOI: 10.11867/j.issn.1001-8166.2013.07.0765
综述与评述     
海洋沉积物甲烷厌氧氧化作用(AOM)及其对无机硫循环的影响
吴自军,任德章,周怀阳
同济大学海洋地质国家重点实验室,上海 200092
Anaerobic Oxidation of Methane (AOM) and Its Influence on Inorganic Sulfur Cycle in Marine Sediments
Wu Zijun, Ren Dezhang, Zhou Huaiyang
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
 全文: PDF(676 KB)  
摘要:

甲烷厌氧氧化作用(AOM)在调控全球甲烷收支平衡以及缓解因甲烷引起的温室效应等方面扮演着十分重要的角色,成为近些年来海洋生物地球化学领域的研究热点之一。一般而言,海洋沉积物孔隙水硫酸盐还原主要是通过2种反应途径来完成,即氧化有机质途径和AOM途径。长期以来,与有机质氧化途径相关的硫酸盐还原作用研究已有充分展示,而由AOM驱动的硫酸盐还原及其对自生硫化铁形成与埋藏的重要贡献却被严重低估。侧重从生物地球化学、同位素地球化学等角度,综述近些年来不同环境条件下海洋沉积物AOM作用发生的地球化学证据和AOM对沉积物孔隙水硫酸盐消耗比例的贡献大小及其调控因素。AOM过程产生的H2S会与沉积物中活性铁结合形成自生铁硫化物。与沉积物浅表层条件相比,AOM过程固定的自生铁硫化物不容易发生再氧化,更利于在沉积物中埋藏保存起来。AOM与海洋沉积物硫酸盐还原作用相偶联,由AOM驱动的硫酸盐还原过程对海底自生铁硫化物形成与埋藏的重要贡献不容忽视。该综述有助加深对海洋沉积物AOM作用的认识及其对硫循环的全面理解。

关键词: 沉积物甲烷厌氧氧化(AOM)硫酸盐还原硫循环    
Abstract:

The process of AOM plays a significant role in regulating the global balance of methane budget and reducing the greenhouse effect driven by methane emission into atmosphere. Therefore, AOM occurring in marine sediments has become a hot research topic of biogeochemistry in recent years. Generally,sulfate reduction occurs mainly through two pathways, e.g., oxidation organic matter and AOM. Currently, a lot of literatures documented the sulfate reduction driven by the organic matter, however, sulfur cycle driven by AOM was seriously underestimated. Here, based on the views of biogeochemistry and isotope geochemistry, we review the biogeochemistry evidence of AOM process occurring and the controlling factors of sulfate reduction through the AOM pathway. The process of AOM can produce H2S and it further react with reactive iron, forming the iron sulfur minerals. Comparing to the surface sediments, the iron sulfur minerals formation due to AOM are not easy oxidation and therefore buried favorably in the marine sediments. Thus, the roles of sulfate reduction and authigenic iron sulfide minerals formation driven by AOM should not be neglected. We hope this review paper will be helpful to better understand the AOM process and sulfur cycle in marine sediments.

Key words: Sediments    Anaerobic Oxidation of Methane (AOM)    Sulfate reduction    Sulfur cycle.
收稿日期: 2012-12-14 出版日期: 2013-07-10
:  P736.4  
基金资助:

大洋“十二五”课题“大西洋多金属硫化物成矿潜力与资源环境评价”(编号:DY125-12-R-01);国家自然科学基金项目“东海陆架沉积物硫酸盐还原及自生硫化铁的形成:甲烷厌氧氧化(AOM)的影响与贡献”(编号:41176065)资助.

通讯作者: 吴自军(1973-),男,安徽安庆人,副教授,主要从事海洋生物地球化学研究.wuzj@tongji.edu.cn     E-mail: wuzj@tongji.edu.cn
作者简介: 吴自军(1973-),男,安徽安庆人,副教授,主要从事海洋生物地球化学研究.E-mail:wuzj@tongji.edu.cn
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引用本文:

吴自军,任德章,周怀阳. 海洋沉积物甲烷厌氧氧化作用(AOM)及其对无机硫循环的影响[J]. 地球科学进展, 2013, 28(7): 765-773.

Wu Zijun, Ren Dezhang, Zhou Huaiyang. Anaerobic Oxidation of Methane (AOM) and Its Influence on Inorganic Sulfur Cycle in Marine Sediments. Advances in Earth Science, 2013, 28(7): 765-773.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2013.07.0765        http://www.adearth.ac.cn/CN/Y2013/V28/I7/765

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