| 冲绳海槽MIS6期以来底栖有孔虫碳氧同位素特征及其古海洋指示意义 |
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| 引用本文： | 窦衍光,李清,吴永华,赵京涛,孙呈慧,蔡峰,陈晓辉,张勇,范佳慧,石学法.冲绳海槽MIS6期以来底栖有孔虫碳氧同位素特征及其古海洋指示意义[J].地学前缘,2022,29(4):84-92. |
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| 作者姓名： | 窦衍光 李清 吴永华 赵京涛 孙呈慧 蔡峰 陈晓辉 张勇 范佳慧 石学法 |
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| 作者单位： | 1.中国地质调查局 青岛海洋地质研究所, 山东 青岛 2662372.青岛海洋科学与技术试点国家实验室 海洋地质过程与环境功能实验室, 山东 青岛 2660613.自然资源部第一海洋研究所 自然资源部海洋地质与成矿作用重点实验室, 山东 青岛 2660614.青岛海洋科学与技术试点国家实验室 海洋矿产资源评价与探测技术功能实验室, 山东 青岛 266237 |
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| 基金项目： | 国家自然科学基金项目(41776077);国家自然科学基金项目(41306062);国家自然科学基金项目(42176078);中国地质调查局地质调查专项(DD20190205);国家海洋局国际合作项目(GEOGEO04) |
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| 摘 要： | 基于AMS 14C年龄和底栖有孔虫氧同位素建立的地层年代框架,重点探讨了冲绳海槽中北部CSHC-15孔MIS6期以来(约200 ka)底栖有孔虫δ13C特征及其古海洋指示意义。结果显示,冰期-间冰期表层初级生产力和有机质通量的变化是导致底栖有孔虫δ13C值在MIS4和MIS6期负偏而在MIS1、MIS3和MIS5期正偏的主要原因。MIS2期的底栖有孔虫δ13C正偏,指示了NPIW侵入冲绳海槽,导致通风性加强,底层水呈弱氧化状态。甲烷渗漏引发的甲烷厌氧氧化作用(AOM)是导致CSHC-15孔底栖有孔虫在MIS4期碳同位素大幅负偏的原因。
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| 关 键 词： | 古海洋意义 碳氧同位素 底栖有孔虫 MIS6期 冲绳海槽 |
| 收稿时间： | 2021-10-07 |
Carbon and oxygen isotopic characteristics of benthic foraminifera in the Okinawa Trough since MIS6 and their palaeoceanographical significance |
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| DOU Yanguang,LI Qing,WU Yonghua,ZHAO Jingtao,SUN Chenghui,CAI Feng,CHEN Xiaohui,ZHANG Yong,FAN Jiahui,SHI Xuefa.Carbon and oxygen isotopic characteristics of benthic foraminifera in the Okinawa Trough since MIS6 and their palaeoceanographical significance[J].Earth Science Frontiers,2022,29(4):84-92. |
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| Authors: | DOU Yanguang LI Qing WU Yonghua ZHAO Jingtao SUN Chenghui CAI Feng CHEN Xiaohui ZHANG Yong FAN Jiahui SHI Xuefa |
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| Institution: | 1. Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China3. Key Laboratory of Marine Geology and Metallogeny, First Institute of Marine Geology, MNR, Qingdao 266061, China4. Laboratory for Marine Mineral Resource, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China |
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| Abstract: | Based on the stratigraphic age framework constructed by AMS14C ages and benthic foraminiferal oxygen isotopic analysis, the δ13C characteristics of benthic foraminifera and their palaeoceanographical significance were analyzed for core CHHC-15 in central and northern Okinawa Trough since marine isotope stage 6 (MIS6) around 200 ka BP. According to the results, the δ13C negative deviation in MIS4 and MIS 6 and positive deviation in MIS1, MIS3 and MIS5 mainly reflect the changes in surface primary productivity and organic matter flux during glacial-interglacial cycles; whilst the δ13C positive deviation in MIS2 indicates NPIW incursion into the Okinawa Trough since the LGM which resulted in enhanced ventilation and weak oxidation of the bottom water. The large δ13C negative deviation in MIS4 is likely caused by methane anaerobic oxidation (AOM). |
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| Keywords: | paleoceanographical implication carbon and oxygen isotope benthic foraminifera MIS6 stage the Okinawa Trough |
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