Benthic foraminiferal δ^(13)C minimum events in the southeastern Okhotsk Sea over the last 180 ka  

作　　者：Yonghua Wu Xuefa Shi Jianjun Zou Zhenbo Cheng Kunshan Wang Shulan Ge Fengdeng Shi 

机构地区：[1]State Key Laboratory of Marine Geology, Tongji University [2]Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration

出　　处：《Chinese Science Bulletin》2014年第24期3066-3074,共9页

基　　金：supported by the National Basic Research Program of China (2013CB429700);the Basic Scientific Fund for the National Public Research Institutes of China (2012G07, 2013G38);the National Natural Science Foundation of China (40431002, 4071006900 and 40906035);the Youth Marine Science Foundation of the State Oceanic Administration (2013313)

摘　　要：A total of six d13C minimum events,i.e.,VI,V,IV,III,II,and I,were observed via a stable carbon and oxygen isotope analysis of infaunal benthic foraminifera Uvigerina spp.in gravity core OS03-1 in the southeastern Okhotsk Sea over the last 180 ka.These events occurred at112–109,102–90,85–76,57–54,44–40,and 17–10 ka BP.The largest negative excursions reached 2.5%in event V and were greater than 1%in the other events.We proposed that all d13C minimum events were caused by the increase in sea surface water productivity,the weakened formation of Okhotsk Sea intermediate water,and the enhancement of the oxygen minimum zone.The negative excursions were unaffected by methane hydrate destabilization and subsequent methane release based on the results obtained by using archaeal lipid markers.A total of six δ13C minimum events, i.e., Ⅵ, Ⅴ, Ⅳ, Ⅲ, Ⅱ, and Ⅰ, were observed via a stable carbon and oxygen isotope analysis of infaunal benthic foraminifera Uvigerina spp. in gravity core OS03-1 in the southeastern Okhotsk Sea over the last 180 ka. These events occurred at 112-109, 102-90, 85-76, 57-54, 44-40, and 17-10 ka BP. The largest negative excursions reached 2.5 ‰ in event V and were greater than 1‰ in the other events. We proposed that all δ13C minimum events were caused by the increase in sea surface water productivity, the weakened formation of Okhotsk Sea intermediate water, and the enhancement of the oxygen minimum zone. The negative excursions were unaffected by methane hydrate destabilization and subsequent methane release based on the results obtained by using archaeal lipid markers.

关 键 词：鄂霍次克海 底栖有孔虫 东南部 事件 氧同位素分析 甲烷水合物 甲烷释放 分解释放 

分 类 号：P735[天文地球—海洋生物学]