| Benthic foraminiferal δ~(13)C minimum events in the southeastern Okhotsk Sea over the last 180 ka |
| |
| 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.
|
| 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 |
Benthic foraminiferal δ
13C minimum events in the southeastern Okhotsk Sea over the last 180 ka |
| |
| Authors: | Yonghua Wu Xuefa Shi Jianjun Zou Zhenbo Cheng Kunshan Wang Shulan Ge Fengdeng Shi |
| |
| Institution: | 1. State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China
2. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China
|
| |
| Abstract: | A total of six δ 13C 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 δ 13C 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. |
| |
| Keywords: | Benthic foraminifera δ13C minimumevents Surface water productivity Okhotsk Seaintermediate water （OSIW） Oxygen minimum zone（OMZ） |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
|
