摘要
水环境中锶的含量及其变化、地理分布及其控制因素等特征的研究有助于认识区域水文地球化学特征及流域盆地岩石风化速率等地球化学行为,因此河流环境中锶的地球化学行为是地球化学研究的重要课题之一。对我国中东部地区部分河流水体中溶解态锶含量进行了分析研究发现,与世界上主要河流溶解态锶含量平均值0.078 mg/L相比,中国中东部地区河水中的锶含量(0.139 mg/L)明显偏高。分析研究表明,中国中东部地区河水中的锶主要源于蒸发盐岩和碳酸盐岩的风化作用,流域锶含量从南向北逐渐增加的现象主要受流域岩石或沉积物类型的控制,化学风化作用越强烈,河流锶含量越高。除了受区域岩性的影响外,气候条件对流域河水中的锶含量水平及地理分布起到一定的控制作用。
Strontium geochemistry of surface waters helps shed light on the regional hydrogeochemieal characteristics and rockweathering rates in draining basins, as well as on anthropogenic influence on the environment. The analysis of Sr on the scale of drainage basins, therefore, has long been an interesting subject to geochemists. Rivers in middle-eastern China developed in various climatic and geological backgrounds provide ideal water systems for examining the element geochemistry and gaining insight into the natural and anthropogenic constraints on the vicissitudes of the environments. In this study, Sr concentrations were measured in 127 water samples from the mainstreams and branches of rivers in middle-eastern China. Compared with the world average concentration of 0. 078mg/L, rivers in middle-eastern China apparently have higher Sr concentrations. Weathering of limestones and evaporates in the drainage basins are responsible for the high water Sr concentrations, a general increase in Sr concentrations from south to north, therefore, results primarily from the nature of rocks and sediments in the drainage basins. The stronger the rock weathering, the higher the Sr concentrations in river water. Besides the impact of rock weathering, our data also indicate the impact of regional climate.
出处
《地球与环境》
CAS
CSCD
北大核心
2009年第1期42-49,共8页
Earth and Environment
基金
中国科学院创新团队国际合作伙伴计划资助项目
国家自然科学基金资助项目(40403010)
西北大学大陆动力学国家重点实验室开放课题基金项目(07LCD13)
关键词
锶元素
黄河
长江
风化作用
气候变化
水化学
Sr Yellow River Yangtze River rock weathering climate change water chemistry
