Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea
文献类型：期刊论文
| 作者 | Guan, Hongxiang; Feng, Dong; Wu, Nengyou; Chen, Duofu |
| 刊名 | ORGANIC GEOCHEMISTRY
 |
| 出版日期 | 2016 |
| 卷号 | 91页码:109-119 |
| 关键词 | Biomarkers Cold seep Authigenic carbonate Stable isotopes Methane seepage intensity South China Sea |
| 通讯作者 | Feng, D (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China. |
| 中文摘要 | Authigenic carbonate rocks from an active seep (Site F) located in the South China Sea (SCS) at a water depth of 1120 m were studied using mineralogical and lipid biomarker analyses. Carbonate mineral compositions, in specific samples, were predominantly aragonite, high-Mg calcite (HMC), or a mixture of both. Abundant C-13-depleted lipid biomarkers diagnostic for archaea provide evidence that anaerobic oxidation of methane (AOM), mediated by anaerobic methane oxidizing archaea (ANME) and their bacterial partners, are the major processes leading to formation of the carbonates. High Methane Index, dominance of ANME-2 assemblages and the predominant contribution of AOM-related biomarkers in the aragonitic carbonate point to the strong impact of AOM communities during its precipitation, which is likely caused by high seepage intensities. The relatively low Methane Index and abundant allochthonous input of the HMC carbonate are a result of the weak impact of AOM microbial communities under conditions of low methane seepage. Evidence for this interpretation also comes from relatively higher carbonate content, lesser contribution of allochthonous organic matter and lower pyrite content in the aragonitic carbonate than in the HMC carbonate. High concentrations of C-13-depleted hopanoids were observed in the aragonitic sample which may be a result of the intermittent presence of oxic conditions in an overall anoxic condition, possibly induced by changing seepage intensities. Our data suggests that lipid biomarkers in authigenic carbonate from seep sites can be helpful for improving assessments of the fluid dynamics in such a complex system. (C) 2015 Elsevier Ltd. All rights reserved. |
| 学科主题 | Geochemistry & Geophysics |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/15605]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Guan, Hongxiang,Feng, Dong,Wu, Nengyou,et al. Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea[J]. ORGANIC GEOCHEMISTRY,2016,91:109-119. |
| APA | Guan, Hongxiang,Feng, Dong,Wu, Nengyou,&Chen, Duofu.(2016).Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea.ORGANIC GEOCHEMISTRY,91,109-119. |
| MLA | Guan, Hongxiang,et al."Methane seepage intensities traced by biomarker patterns in authigenic carbonates from the South China Sea".ORGANIC GEOCHEMISTRY 91(2016):109-119. |
入库方式： OAI收割
来源：南海海洋研究所
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