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Geochemistry of trace elements and Sr-Nd isotopes of foraminifera shell from the Okinawa Trough

Acta Oceanologica Sinica 2001年第1期20卷 95-103页

作者： Meng Xianwei 1,2 ,Du Dewen 1,2 ,Cheng Zhenbo 11 .FirstInstituteofOceanography ,StateOceanicAdministration ,Qingdao 2 6 6 0 6 1,China2 .KeyLaboratoryofMarineScienceandNumericalModeling ,StateOceanicAdministration ,Qingdao 2 6 6 0 6 1,China First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Key Lab. Mar. Sci. Numer. Modeling State Oceanic Administration Qingdao 266061 China

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 enriches Sr,P,Mn and Ba, 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 *** 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 *** 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.

关键词： foraminifera shell trace element Sr-Nd isotopes

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