| Meng Xianwei,Du Dewen,Cheng Zhenbo. 2001. Geochemistry of trace elements and Sr-Nd isotopes of foraminifera shell from the Okinawa Trough. Acta Oceanologica Sinica, (1):95－103 |
| Geochemistry of trace elements and Sr-Nd isotopes of foraminifera shell from the Okinawa Trough |
| Geochemistry of trace elements and Sr-Nd isotopes of foraminifera shell from the Okinawa Trough |
| Received:October 10, 2000 Revised:December 10, 2000 |
| DOI： |
| Key words:Foraminifera shell trace element Sr-Nd isotopes |
| 中文关键词: Foraminifera shell trace element Sr-Nd isotopes |
| 基金项目:This study was supported by the National Natural Science Foundation of China under contract No.49706068)and by the Science Foundation of the State Oceanic Administration for Youth under contract No.99506. |
| Author Name | Affiliation | | Meng Xianwei | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Key Laboratory of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061, China | | Du Dewen | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
Key Laboratory of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao 266061, China | | Cheng Zhenbo | 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 to recognition of biogenic material from mixed marine sediments.The foraminifera shell from the Okinawa Trough strongly enrichesSr, P, Mn andBa, enriches Li, U, Th, Sc, Co, Cu, Pb, Zn, Cr, Rb, Y, Sb and light rare earth elements, slightly enriches V, Ga, Zr, Nb, Cd and middle rare earth elements, is short of Mo, In, Sn, Cs, Hf, Ta, W, Ti, Bi and heavy rare earth elements.The mechanism of elemental enrichment in forminifera 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 (rare earth elements) partition pattern of foraminifera shell of the Okinawa Trough shows enrichment of middle rare earth elements with 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 China's Mainland, the former is slightly higher than those of oceanic water, but much lower than those of river water; the latter is slightly lower than those of oceanic water, but higher than those of river water, demonstrating that the Okinawa Trough sea water has been influenced by river water of China's Mainland. |
| 中文摘要: |
| Trace elemental associations and Sr-Nd isotopic compositions are of important to recognition of biogenic material from mixed marine sediments.The foraminifera shell from the Okinawa Trough strongly enrichesSr, P, Mn andBa, enriches Li, U, Th, Sc, Co, Cu, Pb, Zn, Cr, Rb, Y, Sb and light rare earth elements, slightly enriches V, Ga, Zr, Nb, Cd and middle rare earth elements, is short of Mo, In, Sn, Cs, Hf, Ta, W, Ti, Bi and heavy rare earth elements.The mechanism of elemental enrichment in forminifera 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 (rare earth elements) partition pattern of foraminifera shell of the Okinawa Trough shows enrichment of middle rare earth elements with 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 China's Mainland, the former is slightly higher than those of oceanic water, but much lower than those of river water; the latter is slightly lower than those of oceanic water, but higher than those of river water, demonstrating that the Okinawa Trough sea water has been influenced by river water of China's Mainland. |
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