Environmental controls on sulfur isotopic compositions of sulfide minerals in seep carbonates from the South China Sea
文献类型：期刊论文
| 作者 | Peng, Yongbo5; Tong, Hongpeng5; Gong, Shanggui4; Hu, Yu5; Li, Niu; Feng, Dong1; Liang, Qianyong3; Chen, Duofu1,5; Tao, Jun5 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2018 |
| 卷号 | 168页码:96 |
| 关键词 | Authigenic carbonate andpyrite Sulfur isotope Fluid intensity Cold seep South China Sea |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2018.04.037 |
| 英文摘要 | Authigenic carbonates and pyrite associated with sulfate-driven anaerobic oxidation of methane (AOM) at methane seeps provide archives to explore the biogeochemical processes involved and seepage dynamics over time. The wide range and extremely high delta S-34 values of pyrite (delta S-34(py)) have been used to trace the AOM-related processes. However, the detailed mechanism for this phenomenon is not well understood. We propose that the characteristics of delta S-34(py) were mainly controlled by the competition between sulfate reduction and sulfate supply, as well as the redox condition. To test this hypothesis, we investigated Sr/Ca and Mg/Ca ratios, trace element compositions, pyrite contents and sulfur isotopic compositions in seep carbonates from Site F and Haima in the northern South China Sea. Calcite and aragonite contents were distinguished through the Sr/Ca and Mg/Ca ratios. The data show that aragonites are always associated with relatively low delta S-34(py) values compared to calcites. The Mo contents show a good correlation with pyrite contents in calcites and aragonites, and the slope in aragonites is larger than that in calcites. This relationship indicates that the aragonite precipitated in a relatively open system with higher Mo availability. Thus, we conclude that sulfides with low delta S-34 values formed at high supply of sulfate under the relatively open system with respect to diffusive replenishment of sulfate, where the carbonate precipitation occurred close to the seafloor due to a strong methane flux. Under vigorous methane flux simultaneously, the high potential of less anoxic conditions, which could limit the additional pyrite accumulation and/or favor the microbial disproportionation, could also be the cause of the low delta S-34(py), as supported by samples from the Haima sites. Evidence for this assumption is based on the occurrence of bivalve shells and less enrichment in As and Sb. Conversely, the positive delta S-34(py) values result from near to complete exhaustion of dissolve sulfate via AOM within a deeper sulfate-methane transition zone, where Mo is less available. The combination of a detailed elemental study of authigenic carbonates with sulfur isotopic composition of sulfide minerals in carbonates is a promising tool for reconstructing the dynamics of seep intensities at modern and, potentially, geological seep sites. |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/17666]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, CAS Key Lab Ocean & Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China 4.China Geol Survey, MLR Key Lab Marine Mineral Resources, Guangzhou Marine Geol Survey, Guangzhou 510070, Guangdong, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China |
| 推荐引用方式 GB/T 7714 | Peng, Yongbo,Tong, Hongpeng,Gong, Shanggui,et al. Environmental controls on sulfur isotopic compositions of sulfide minerals in seep carbonates from the South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:96, 105. |
| APA | Peng, Yongbo.,Tong, Hongpeng.,Gong, Shanggui.,Hu, Yu.,Li, Niu.,...&Tao, Jun.(2018).Environmental controls on sulfur isotopic compositions of sulfide minerals in seep carbonates from the South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,168,96. |
| MLA | Peng, Yongbo,et al."Environmental controls on sulfur isotopic compositions of sulfide minerals in seep carbonates from the South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):96. |
入库方式： OAI收割
来源：南海海洋研究所
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