长江口及邻近海域水体主元素和锶同位素地球化学  

Major Elements and Sr Isotopes of the Dissolved Loads in the Yangtze River Estuary and its Adjacent Areas

作　　者：Sivaji-Patra 刘丛强[1] 汪齐连[1] 王中良[1] 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550002 [2]中国科学院研究生院,北京100039

出　　处：《地球与环境》2009年第4期333-336,共4页Earth and Environment

基　　金：国家自然科学基金重点项目(编号:90610037);中国科学院海外合作伙伴计划项目联合资助

摘　　要：根据2005年6月对长江口及其邻近海域水体的现场调查,分析探讨了长江口水体主元素、Sr及Sr同位素的组成变化。长江河水的Sr含量和87Sr/86Sr同位素比值分别为1.75μmol/L和0.7105,反映出长江流域以碳酸盐岩风化为主的化学风化特征;河口区主元素与盐度的显著正相关关系显示出它们在河水与海水混合过程中的保守特性;87Sr/86Sr与1/Sr的非线性关系则暗示了长江口水体的Sr不是河水与海水的简单混合,可能伴有其他端元水体的混入。Variations in the concentrations and distribution of the major elements,Sr and Sr isotopes in the Yangtze River Estuary were investigated based on the data obtained during field observations in June 2005.The river water is characterized with lower concentrations of Sr（1.75μmol/L） and higher ^87Sr/^86Sr（0.7105）,showing the weathering characteristics of the Yangtze River draining basin,and it was controlled by the weathering of carbonates;the positive correlation between the concentrations of major elements and salinity showed that they were conservative in the mixing zone;non-linear behavior of 1/Sr and ^87Sr/^86Sr at the estuary implies the dissolved Sr did not only come from the mixing of freshwater and seawater,but also from other sources.

关 键 词：长江 河口 水体混合 主元素 SR同位素 

分 类 号：P595[天文地球—地球化学] P597[天文地球—地质学]