2018年10月27日 | tags | views 71

Geochemical and microbial characters of sediment from the gas hydrate area in the Taixinan Basin豪门囚情, South China Sea
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利亚迪桑 , 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 GMGS2-16nivea 保定冀英学校 , 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)道门秘术 , while the dominant taxa in the archaeal communities are Marine_Benthic_Group_B (MBGB), Halobacteria古丽扎纳 , Thermoplasmata姬云飞简历 , Methanobacteria, Methanomicrobia王鲲鹏 , Group C3 and MCG. Under parallel experimental operations徐小稀 , 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唐朝绮丽男 , these members have been found predominant in other known gas hydrate bearing cores伊藤千晃 , and the dominant of MBGB has even been found significantly related to gas hydrate occurrence. Therefore富贵天姿, a high possibility for the existing of gas hydrate underlying Core DH_CL_11 is inferred黎爱莲 , which is consistent with the geochemical analyses. In all施笑朔 ,钱今凡 combined geochemical and microbiological analyses are more informative in characterizing sediments from gas hydrate-associated areas in the South China Sea.Key words:GeochemistryMicrobial community16S rRNAGas hydrateTaixinan BasinSouth China Sea中文关键词:地球化学微生物群落16S rRNA天然气水合物台西南盆地南海
GONG Junli刘灿梁 ,SUN Xiaoming尺蠖效应 ,LIN Zhiyong羊梅子 ,LU Hongfeng斗球小子 ,LU Yongjun. 2017. Geochemical and microbial characters of sediment from the gas hydrate area in the Taixinan Basin缪洁晶 , South China Sea. Acta Oceanologica Sinica, 36(9):52-64酒井直次 ,DOI:10.1007/s13131-017-1111-2