中文摘要：

报道了南海表层沉积物中铂族元素的丰度及其分布特征。52个表层沉积物中铂族元素（PGE）含量变化范围：钌为0.40×10-9~3.20×10-9,平均值为1.20×10-9;钯为0.01×10-9~13.30×10-9,平均值为4.31×10-9;铱为0.59×10-9~4.49×10-9,平均值为1.21×10-9;铂为1.27×10-9~16.21×10-9,平均值为5.26×10-9;铑为0.05×10-9~0.2×10-9,平均值为0.12×10-9;金为0.43×10-9~27.38×10-9,平均值为6.92×10-9。尽管PGE含量与沉积物平均粒径的关系不是很明显,但是整体上随平均粒径的增大,PGE含量出现逐渐减少的趋势,表现出一定的粒度控制规律。南海全海域表层沉积物铂、钯、钌、铑、铱和金的估算背景值分别为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和4.720×10-9±0.413×10-9,远高于我国大陆东部地壳的,而与深海沉积物的基本处于同一水平,表现出了海洋沉积物富集PGE的固有特征。尽管PGE在大陆架区有所富集,但明显富集区主要分布在吕宋岛以西至中央海盆区域,指示海底火山喷发作用释放的PGE对南海中西部深海盆区沉积物中的PGE可能有重要贡献。

英文摘要：

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.