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Widespread Methane Seep Activities along the Western Slope of the Okinawa Trough, East China Sea 被引量:2
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作者 LI Qing CAI Feng +7 位作者 YAN Guijing LIANG Jie SHAO Hebin WANG Meng DONG Gang WANG Feng SUN Yunbao LUO Di 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第4期1505-1506,共2页
The westem slope of the Okinawa trough has been considered to experience important methane seep activities. Abundant terrigenous sediments supply and widely developed normal faults make this area an ideal place for me... The westem slope of the Okinawa trough has been considered to experience important methane seep activities. Abundant terrigenous sediments supply and widely developed normal faults make this area an ideal place for methane production, methane fluids migration and associated anaerobic oxidation of methane. 展开更多
关键词 than this Widespread methane seep Activities along the Western Slope of the Okinawa Trough East China Sea SMI show AOM
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Characteristics of Authigenic Pyrite and its Sulfur Isotopes Influenced by Methane Seep--Taking the Core A at Site 79 of the Middle Okinawa Trough as an Example 被引量:1
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作者 WANG Meng LI Qing +7 位作者 CAI Feng LIANG Jie YAN Guijing DONG Gang WANG Feng SHAO Hebin LUO Di CAO Yimin 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第1期365-366,共2页
Objective Authigenic pyrite often develops extensively in marine sediments,which is an important product of sulfate reduction in an anoxic environment.It has a specific appearance and complicated sulfur isotopic prope... Objective Authigenic pyrite often develops extensively in marine sediments,which is an important product of sulfate reduction in an anoxic environment.It has a specific appearance and complicated sulfur isotopic properties,and acts as important evidence of methane seep in marine sediments.Strong AOM(anaerobic oxidation of methane)activity has developed in the Okinawa Trough. 展开更多
关键词 AOM Characteristics of Authigenic Pyrite and its Sulfur Isotopes Influenced by methane seep Taking the Core A at Site 79 of the Middle Okinawa Trough as an Example
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Characteristics of authigenic pyrite and its sulfur isotopes influenced by methane seep at Core A, Site 79 of the middle Okinawa Trough 被引量:5
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作者 WANG Meng CAI Feng +6 位作者 LI Qing LIANG Jie YAN GuiJing DONG Gang WANG Feng SHAO HeBin HU GaoWei 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第12期2145-2153,共9页
The anaerobic oxidation of methane (AOM) has strongly developed at Core A, Site 79 of the middle Okinawa Trough, East China Sea, and a large amount of authigenic pyrite is preserved in the surface sediment. In this ... The anaerobic oxidation of methane (AOM) has strongly developed at Core A, Site 79 of the middle Okinawa Trough, East China Sea, and a large amount of authigenic pyrite is preserved in the surface sediment. In this study, we analyze the characteristics of the authigenic pyrite and its sulfur isotopic values. The authigenic pyrite is stripy and tubular, and there were foraminifera compartments filled with pyrite. The pyrite is extracted using chromium reduction, and the values of δ348 are found to lie between -41.20‰ and 8.92‰ V-CDT. The bulk pyrite tends to be more enriched in 348 with increasing depth. Particularly, the 834S value of the pyrite lies between -32.73%o and -41.20‰ V-CDT above 278 cmbsf, but it quickly increases below this depth (-21.49%o-8.92‰ V-CDT). At the same time, the total sulfur content of the pyrite shows an abrupt increase above 100 cmbsf but is otherwise stable between 1.04% and 0.55% below 100 cmbsf. The stable and negative values of 8345 and the decreasing values of total sulfur above 278 cmbsf indicate reduced AOM activities in 17.18-5.3 ka. In addition, the increasing δ34S and pyrite content indicate strong AOM development and methane seep below 278 cmbsf in 18.8-17.18 ka. In particular, the highest positive value of δ34S occurring in 18.78 ka indicates the most intense AOM activity. The shallow sul- fate-methane interface (SMI) and high methane flux below marine sediments also strongly support this activity. 展开更多
关键词 authigenic pyrite sulfur isotope chromium reduction anaerobic oxidation of methane methane seep Okinawa Trough
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Geochemical constraints on the methane seep activity in western slope of the middle Okinawa Trough, the East China Sea 被引量:4
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作者 LI Qing CAI Feng +5 位作者 LIANG Jie SHAO HeBin DONG Gang WANG Feng YANG ChuanSheng HU GaoWei 《Science China Earth Sciences》 SCIE EI CAS CSCD 2015年第6期986-995,共10页
Anaerobic oxidation of methane and sulfate reduction was studied in the pore waters of four cores at two stations of the middle Okinawa Trough. Pore water vertical distributions of sulfate, methane, sulfide, total alk... Anaerobic oxidation of methane and sulfate reduction was studied in the pore waters of four cores at two stations of the middle Okinawa Trough. Pore water vertical distributions of sulfate, methane, sulfide, total alkalinity, ammonium, and phosphate were determined in this study. Our results show strong linear sulfate concentration gradients of 6.83 mmol/L m?1 in Core A and 5.96 mmol/L m?1 in Core C, which were collected from two stations. Concurrent variations of methane, total alkalinity and hydrogen sulfide all exhibit steep increases with depth at both cores, which indicate active methane seep activities around two stations. Pore water ammonium and phosphate concentrations reveal minor influences of organic matter degradation on sulfate reduction at two stations. Sulfate methane interface(SMI) was extrapolated from linear sulfate profiles in methane seep cores. Shallower SMI depths(A: 4.9 mbsf; C: 5.4 mbsf) indicate strong methane fluxes and active anaerobic oxidation of methane in the underlying sediments. 展开更多
关键词 anaerobic oxidation of methane methane seep pore water the Okinawa Trough
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The influence of coupling mode of methane leakage and debris input on anaerobic oxidation of methane
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作者 Rui Xie Daidai Wu +4 位作者 Jie Liu Guangrong Jin Tiantian Sun Lihua Liu Nengyou Wu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2021年第8期78-88,共11页
Anaerobic oxidation of methane(AOM) is an important biogeochemical process, which has important scientific significance for global climate change and atmospheric evolution. This research examined the δ^(34)S, terrige... Anaerobic oxidation of methane(AOM) is an important biogeochemical process, which has important scientific significance for global climate change and atmospheric evolution. This research examined the δ^(34)S, terrigenous clastic indices of TiO_(2) and Al_(2)O_(3), and times for formation of the Ba front at site SH1, site SH3 and site 973-4 in the South China Sea. Three different coupling mechanisms of deposition rate and methane flux were discovered. The different coupling mechanisms had different effects on the role of AOM. At site 973-4, a high deposition rate caused a rapid vertical downward migration of the sulphate–methane transition zone(SMTZ), and the higher input resulted in mineral dissolution. At site SH3, the deposition rate and methane flux were basically in balance,so the SMTZ and paleo-SMTZ were the most stable of any site, and these were in a slow process of migration. At site SH1, the methane flux dominated the coupled mode, so the movement of the SMTZ at site SH1 was consistent with the general understanding. Understanding the factors influencing the SMTZ is important for understanding the early diagenesis process. 展开更多
关键词 methane seep terrestrial detrital material anaerobic oxidation of methane gas hydrate
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