台湾海峡西部海底及毗邻陆域铅铜元素丰度与转换机制

Elements abundance of Pb,Cu with their transformable mechanism in submarine of western Taiwan Strait and its adjacent land area

台湾海峡西部海底及毗邻福建陆域Pb元素丰度较高，而Cu较对比值低或相当。二者的转换形成机制不同，受元素特性、岩石化学成分、地表风化特点及入海沉积差异等因素控制。在含量分布中构成一组颇具意义的丰度模式。

In the submarlne surface sediment of western Taiwan Strait composed of bay and litteral sea of Fujian,the abandance of Pb which belongs to the element of high-grade abundance in this area is 26. 9 ×10-6 (m/m)more than its contrastive value,while the abundance of Cu is slighly lower than the value. In surface soil of neighbouring land in Fujian,the abundance of Pb ls notably 40. 09×10-6 (m/m ) more than the constrative value,whlle Cu is more and less the same. Thus the abundance of Pb and Cu posses the character of inheritance and similarity in the submarine surface sediment with the land surface soil. But Pb or Cu has no difference in transformable mechanism. The abundance of Pb and Cu in the rock of land are of high-grade which has been controlled by the specific property of each element chemical composi-tion of rock and wethering features in ground surface. After clinatic erosion,the content of Pb has slightly decreased while soil remains to be of high-grade abundance. Cu has been eroded more heavily. Being input into the sea,the content of Pb is distributed dishomogeneously not only because it possess character of advance sedimentation depolymerized wit stronger absop-tion and higher content in bays and estuaries but also the characters of a'scanvenging'ele-ment- The content of Cu which is a'nutrient'element has been adsorped weakly. Therefor it has been diluted and reaches well-distribution comparatively. So the relation which has been shaped is either paragenesis or separating in the distribution of contents,and the abundance model of the two elements which has constituted into an abundance model is both similar and different. This model helps contribute to studing the marine paleogeography-sedimentary fa-cies and environmental geochemisty of Pb.