GEOCHEMICAL STUDIES OF Fe,Mn,Co,As,Cr,Sb,Zn,Sc AND V IN SURFACE SEDIMENTS FROM JIAOZHOU BAY

The contents of nearly forty-elements in surface sediments in Jiaozhou Bay were determined using a Neutron Activation Analysis Technique(Grancini,et al.,1976;Li Peiquan et al.,1985,1986;Li Xiuxia etal.,1986).This paper's detailed discussion on only nine elements(Fe,Mn,Co,Cr,Sc,As,Sb,Zn andV)includes their distributions,concentrations,correlationships,material sources,background,etc.Based on Zavaristski's classification method,Fe,Mn,Co Cr and V belong to the second group;As and Sb to theeighth groups:Sc and Zn to the third and sixth groups.It was found that their notably good correla-tionship is mainly due to the similarity of their ionic structures and that their variation is controlled by theFe content(except Mn).The source of sediments is mainly terristrial material,and the composition ofsediment is similar to that of shale and shale+clay.The contents for a large number of ele-ments are within the scope of the background level,but there still is pollution of Zn and Cr,at least in a few stations.     

昆明滇池沉积速率的测定

于１９８９年１２月采用＾２１０Ｐｂ法测定昆明滇池（草海和外海）两个柱样的沉积速率，其值分别为０．２９ｃｍ／ａ和０．２８ｃｍ／ａ，平均值约为０．２９ｃｍ／ａ。在沉积柱１２ｃｍ以上，由于人为影响，其沉积速率没有规律，估计约有３０－４０年的历史。在１２ｃｍ以下，＾２１０Ｐｂｅｘ随深度的变化明显地表现出规律性，以０．２９ｃｍ／ａ的速率计算，从１２ｃｍ到４０ｃｍ这一段大约有９０年的沉积历史。