长江口-杭州湾及其邻近海域沉积动力环境及物源分析  

Dynamic sedimentary environment and the provenance characteristics in Yangtze River Estuary-Hangzhou Bay and its adjacent waters

作　　者：章伟艳[1,2] 张霄宇[3] 金海燕[2,4] 冯旭文[2] 姚旭莹[1,2] 高为利[2] 张富元[1,2] 高爱根[2,4] 

机构地区：[1]国家海洋局海底科学重点实验室,杭州310012 [2]国家海洋局第二海洋研究所.杭州310012 [3]浙江大学地球科学系,杭州310027 [4]国家海洋局海洋生态系统与生物地球化学重点实验室,杭州310012

出　　处：《地理学报》2013年第5期640-650,共11页Acta Geographica Sinica

基　　金：国家自然科学基金项目(41106050;41076036;41203085);国家海洋局第二海洋研究所基本科研业务费专项资金项目(JG1108;JG1219);公益性行业科研专项(2011418012;201205008)共同资助~~

摘　　要：长江口—杭州湾及其邻近海域的物质输运与生态环境受海域沉积动力特征和物质来源影响。本文利用长江口—杭州湾及其邻近海域沉积物的粒度、铂族元素、稀土元素等分析资料,采用Pejrup M等提出的三角图分类法对长江口—杭州湾及其邻近海域沉积动力环境进行详细分析,将研究区分为8个沉积环境分区:二个强动力河口现代沉积区,二个近岸水团交汇作用区,一个陆架水团锋面区,二个残留沉积区,一个冷涡旋的现代沉积区。对比分析了各沉积动力环境区的粒度特征及其水动力条件,揭示各种水动力条件下的沉积特征,以及各种沉积环境的物源输入特征,为长江、黄河与东海间的物质输运和交换等的研究提供基础资料,有助于我们进一步理解物源、搬运介质、沉积条件等因素对海岸—陆架沉积体系的影响,为河口沉积学和生物地球化学等方面研究提供有用信息。There is a complicated dynamic sedimentary environment in Yangtze River Estuary-Hangzhou Bay and its adjacent waters, which is affected by the material transport and eco-environment of waters. In this paper, grain size distributions, rate earth elements and platinum group elements were analyzed for surface sediments from the Yangtze River Estuary-Hangzhou Bay and its adjacent waters. The investigated area has been partitioned into eight dynamic sediment environment divisions with a triangular diagram advanced by Pejrup M： two estuarine modem depositional regions with intense hydrodynamics; two nearshore modem depositional regions with the interaction on different water masses; one frontal region in the continental shelf; two relict sedimentary regions influenced by modem material supply from the warm current and the coastal current; and one modem depositional region with cyclonic eddy. By comparing grain size distributions and hydrodynamic patterns in different dynamic sedimentary environment regions, sedimentary features were revealed under different hydrodynamic conditions and the provenance characteristics were recognized in a variety of depositional environment.

关 键 词：长江口 杭州湾 粒度 沉积动力环境 物源特征 

分 类 号：P736.21[天文地球—海洋地质]