| 冲绳海槽有孔虫壳体的微量元素Sr,Nd同位素地球化学 |
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| 引用本文： | 孟宪伟,杜德文,程振波.冲绳海槽有孔虫壳体的微量元素Sr,Nd同位素地球化学[J].海洋学报,2001,23(2):62-68. |
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| 作者姓名： | 孟宪伟 杜德文 程振波 |
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| 作者单位： | 国家海洋局第一海洋研究所, 山东青岛 266061 |
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| 摘 要： | 钙质生物壳的微量元素组合和Sr,Nd同位素组成是识别海底混合源沉积物中生物源物质相对贡献的重要参数.冲绳海槽有孔虫壳体强烈富集Sr,P,Mn和Ba,富集Li,U,Th,Sc,Co,Pb,Zn,Cr,Rb,Y,Sb和轻稀土元素,弱富集V,Ga,Zr,Nb,Cd和中稀土元素,相对贫Ge,Mo,In,Sn,Cs,Hf,Ta,W,Tl,Bi和重稀土元素,海水中微量元素的背景含量和生物活动对微量元素的选择性吸收是有孔虫壳体中微量元素发生富集和贫化的主要机制,冲绳海槽有孔虫壳体的稀土元素配分模式与海水和太平洋有孔虫的有明显差异,表现出中稀土元素相对富集,并具有微弱的负Ce异常.有孔虫壳体的Sr,Nd同位素比值也与大洋海水不同,分别为0.709769和0.512162,前者略高于大洋海水,后者略低于大洋海水,表明冲绳海槽海水明显受大陆河水影响.
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| 关 键 词： | 有孔虫壳体 微量元素 Sr Nd同位素 |
| 文章编号： | 0253-4193(2001)02-0062-07 |
| 收稿时间： | 3/9/1999 12:00:00 AM |
| 修稿时间： | 1999年3月9日 |
Trace elemental and Sr-Nd isotopic geochemistry of foraminifera shell of the Okinawa Trough |
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| MENG Xian-wei,DU De-wen and CHENG Zhen-bo.Trace elemental and Sr-Nd isotopic geochemistry of foraminifera shell of the Okinawa Trough[J].Acta Oceanologica Sinica (in Chinese),2001,23(2):62-68. |
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| Authors: | MENG Xian-wei DU De-wen and CHENG Zhen-bo |
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| Institution: | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China |
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| Abstract: | Trace elemental associations and Sr, Nd isotopic compositions are of important for recognition of biogenic material from mixed marine sediments. The foraminifera shell of the Okinawa Trough strongly enriches Sr, P Mn and Ba, enriches Li, U, Th, Sc, Co, Cu, Pb, Y, Zn, Cr, Rb, Sb and light rare earth elements, slightly enriches V, Ga, Zr, Nb, Cd and middle rare earth elements, and is relative short of Mo, In, Sn, Cs, Hf, Ta, W, Tl, Bi and heavy rare earth elements. The mechanism of element enrichment of foraminifera is the concentrations of trace elements in sea water and selective absorption of trace elements during foraminifera living, as well as the geochemical affinity between major elements and trace elements. The REE partitioning pattern of foraminifera shell of the Okinawa Trough shows enrichment of middle rare earth elements and slightly negative Ce anomaly, which are different from those of foraminifera of the Pacific Ocean. The Sr, Nd isotopic ratios of the Okinawa Trough foraminifera are 0 709 769 and 0 512 162, respectively, which are different not only from those of oceanic water, but also from those of river water of Chin'a Mainland, the former is slightly higher than that of oceanic water, but much lower than that of river water, the latter is slightly lower than that of oceanic water, but higher than that of river water, which demonstrates that the Okinawa Though sea water has been influenced by river water of Chin'a Mainland. |
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| Keywords: | foraminifera shell trace element Sr-Nd isotopes |
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