- 责任者：Zhu Maoxu (Key Laboratory of Marine Chemistry Theory and Technology ; Ministry of Education ; College of Chemistry and Chemical Engineering ; Ocean University of China ; Qingdao 266100 ; China) ; Shi Xiaoning
- 刊名：Advances in Earth Science
- 出版年：2011
- 卷期：26(4)
- 关键词：海洋沉积物 ; marine sediments ; 矿化作用 ; mineralization ; 成岩作用 ; diagenesis
- 页码：p.355-364
- 图表：1 illus., 1 table, 67 refs.
- 分类号：0200
- issnNo：ISSN1001-8166
- isbnNo：CN62-1091/P
Continental margin sediments are an important biogeochemical reactor, where 90% of organic matter(OM) is deposited and remineralized. OM remineralization proceeds from the use of O2, NO-3, Mn(IV)-oxides, Fe(III)-oxides, sulfate, and finally CO2 according to the gains of free energy yield, forming an ideal redox sequence. Generally, in pelagic deep sediments, aerobic respiration is the only important pathway for OM degradation; in continental margin sediments, however, anaerobic pathways coupled to dissimilatory reduction of Fe(III)-oxides and sulfate are mainly responsible for OM degradation, with sulfate reduction accounting for averagely(62±17)%. From pelagic deep-sea to continental margin sediments, lateral zonation of the relative contributions of aerobic respiration and sulfate reduction, respectively, to carbon mineralization can be observed. Recent reaction-transport modeling indicates that global-scale contributions of aerobic respiration, denitrification, dissimilatory Fe(III) reduction, and sulfate reduction to OM degradation are 15%, 6.2%, 2.8%, and 76%, respectively.