| 南海台西南盆地天然气水合物区沉积物的地球化学和微生物特征分析 |
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| 引用本文： | 宫俊丽,孙晓明,林志勇,陆红锋,陆勇军.南海台西南盆地天然气水合物区沉积物的地球化学和微生物特征分析[J].海洋学报(英文版),2017,36(9):52-64. |
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| 作者姓名： | 宫俊丽 孙晓明 林志勇 陆红锋 陆勇军 |
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| 作者单位： | 中山大学地球科学与地质工程学院, 广州, 510275,中山大学地球科学与地质工程学院, 广州, 510275;中山大学海洋学院, 广州, 510006;广东省海洋资源与近岸工程重点实验室, 广州, 510006,中山大学地球科学与地质工程学院, 广州, 510275,广州海洋地质调查局, 广州, 510075,中山大学生命科学学院, 广州, 510275 |
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| 基金项目： | The Natural Science Foundation of China under contract Nos 91128101, 41273054 and 41373007; the China Geological Survey Project for South China Sea Gas Hydrate Resource Exploration under contract No. DD20160211; the Fundamental Research Funds for the Central Universities under contract No. 16lgjc11; the Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme under contract No. 2011. |
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| 摘 要： | The Taixinan Basin is one of the most potential gas hydrate bearing areas in the South China Sea and abundant gas hydrates have been discovered during expedition in 2013. In this study, geochemical and microbial methods are combinedly used to characterize the sediments from a shallow piston Core DH_CL_11(gas hydrate free) and a gas hydrate-bearing drilling Core GMGS2-16 in this basin. Geochemical analyses indicate that anaerobic oxidation of methane(AOM) which is speculated to be linked to the ongoing gas hydrate dissociation is taking place in Core DH_CL_11 at deep. For Core GMGS2-16, AOM related to past episodes of methane seepage are suggested to dominate during its diagenetic process; while the relatively enriched δ18O bulk-sediment values indicate that methane involved in AOM might be released from the "episodic dissociation" of gas hydrate.Microbial analyses indicate that the predominant phyla in the bacterial communities are Firmicutes and Proteobacteria(Gammaproteobacteria and Epsilonproteobacteria), while the dominant taxa in the archaeal communities are Marine_Benthic_Group_B(MBGB), Halobacteria, Thermoplasmata, Methanobacteria,Methanomicrobia, Group C3 and MCG. Under parallel experimental operations, comparable dominant members(Firmicutes and MBGB) are found in the piston Core DH_CL_11 and the near surface layer of the long drilling Core GMGS2-16. Moreover, these members have been found predominant in other known gas hydrate bearing cores, and the dominant of MBGB has even been found significantly related to gas hydrate occurrence. Therefore,a high possibility for the existing of gas hydrate underlying Core DH_CL_11 is inferred, which is consistent with the geochemical analyses. In all, combined geochemical and microbiological analyses are more informative in characterizing sediments from gas hydrate-associated areas in the South China Sea.
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| 关 键 词： | 地球化学 微生物群落 16S rRNA 天然气水合物 台西南盆地 南海 |
| 收稿时间： | 2016/9/2 0:00:00 |
Geochemical and microbial characters of sediment from the gas hydrate area in the Taixinan Basin, South China Sea |
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| GONG Junli,SUN Xiaoming,LIN Zhiyong,LU Hongfeng and LU Yongjun.Geochemical and microbial characters of sediment from the gas hydrate area in the Taixinan Basin, South China Sea[J].Acta Oceanologica Sinica,2017,36(9):52-64. |
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| Authors: | GONG Junli SUN Xiaoming LIN Zhiyong LU Hongfeng and LU Yongjun |
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| Institution: | 1.School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China2.School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China;Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510006, China3.Guangzhou Marine Geology Survey, Guangzhou 510075, China4.School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China |
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| Abstract: | The Taixinan Basin is one of the most potential gas hydrate bearing areas in the South China Sea and abundant gas hydrates have been discovered during expedition in 2013. In this study, geochemical and microbial methods are combinedly used to characterize the sediments from a shallow piston Core DH_CL_11 (gas hydrate free) and a gas hydrate-bearing drilling Core GMGS2-16 in this basin. Geochemical analyses indicate that anaerobic oxidation of methane (AOM) which is speculated to be linked to the ongoing gas hydrate dissociation is taking place in Core DH_CL_11 at deep. For Core GMGS2-16, AOM related to past episodes of methane seepage are suggested to dominate during its diagenetic process; while the relatively enriched δ 18O bulk-sediment values indicate that methane involved in AOM might be released from the “episodic dissociation” of gas hydrate. Microbial analyses indicate that the predominant phyla in the bacterial communities are Firmicutes and Proteobacteria (Gammaproteobacteria and Epsilonproteobacteria), while the dominant taxa in the archaeal communities are Marine_Benthic_Group_B (MBGB), Halobacteria, Thermoplasmata, Methanobacteria, Methanomicrobia, Group C3 and MCG. Under parallel experimental operations, comparable dominant members (Firmicutes and MBGB) are found in the piston Core DH_CL_11 and the near surface layer of the long drilling Core GMGS2-16. Moreover, these members have been found predominant in other known gas hydrate bearing cores, and the dominant of MBGB has even been found significantly related to gas hydrate occurrence. Therefore, a high possibility for the existing of gas hydrate underlying Core DH_CL_11 is inferred, which is consistent with the geochemical analyses. In all, combined geochemical and microbiological analyses are more informative in characterizing sediments from gas hydrate-associated areas in the South China Sea. |
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| Keywords: | Geochemistry Microbial community 16S rRNA Gas hydrate Taixinan Basin South China Sea |
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