Geochemical distributions and their impacts of platinum group elementsfrom surficial sediments in the South China Sea

ZHU Lai-min; SHANG Ting; GAO Zhi-you; LI Ben; XU Jiang

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ZHU Lai-min, SHANG Ting, GAO Zhi-you, LI Ben, XU Jiang. Geochemical distributions and their impacts of platinum group elementsfrom surficial sediments in the South China Sea[J]. Haiyang Xuebao, 2010, 32(1): 56-66.

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Geochemical distributions and their impacts of platinum group elementsfrom surficial sediments in the South China Sea

1.
State Key Laboratory of Continental Dynamics, Department of Geology,Northwest University,Xi’an 710069,China
2.
College of Applied Nuclear Technology and Automation Engineering Chengdu Institute of Technology,Chengdu 610059,China
3.
Third Institute of Oceanography,State Oceanic Administration,Xiamen 361005,China

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Received Date: 2009-04-29

Abstract

Abstract

The content values and distribution of the PGE from surficial sediments in the South China Sea are reported .The contents (in dried weight) of rathenium, palladium,iridium, platium, rhodium, gold in 52 surficial sediments are 0.40×10^-9~3.20×10^-9(average 1.20×10^-9), 0.01×10^-9~13.30×10^-9(average 4.31×10^-9), 0.59×10^-9~4.49×10^-9(average 1.21×10^-9), 1.27×10^-9~16.21×10^-9(average 5.26×10^-9), 0.05×10^-9~0.20×10^-9(average 0.12×10^-9) and 0.43×10^-9~27.38×10^-9(average 6.92×10^-9) ,respectively.The relationship between contents and grain sizes is not clear,but the contents of palatinum group elements show a decreasing trend with the increase of grain size generally. The calculated background values of platinum, palladium,ruthenium,rhodium,iridium and gold are 1.168×10^-9±0.190×10^-9,3.228×10^-9±0.403×10^-9,1.085×10^-9±0.189×10^-9,4.432×10^-9±0.258×10^-9,0.123×10^-9±0.023×10^-9 and 4.720×10^-9±0.413×10^-9,respectively, which are much higher than those of the continental crust of eastern China,but keep the same order with the sediments of deep ocean or slightly higher than them, and showing the connatural characterstics of the marine sediments rich in platinum group elements.The platinum group elements enrich not only in shallow continental shelf area of main river mouths,but also in central deep sea basin area due to the contribution of volcanics input in deep ocean basin area.
- platinum group element,
- geochemical distribution,
- surficial sediments,
- South China Sea

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