北冰洋西部表层沉积物粘土矿物分布及环境指示意义  

Clay Mineral Distributions in Surface Sediments From the Western Arctic Ocean and Their Implications for Sediment Environments

作　　者：陈志华[1] 石学法[2] 韩贻兵[2] 辛春英[3] 杨作升[1] 

机构地区：[1]中国海洋大学,山东青岛266003 [2]海洋沉积与环境地质国家海洋局重点实验室,山东青岛266061 [3]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海洋科学进展》2004年第4期446-454,共9页Advances in Marine Science

基　　金：海洋沉积与环境地质国家海洋局重点实验室开放基金---北冰洋西部沉积物来源与古海洋学记录(MASEG200401);中国第2次北极考察项目(CHINARE 2003)

摘　　要：楚科奇海及邻近的北冰洋深水区表层沉积物中粘土矿物的分布受源区母岩和海区环流结构所制约。来自加拿大马更些河的物质富含高岭石和伊利石,对研究区东北部和北部沉积物的影响较大;来自阿拉斯加西北部的河流和海岸带物质富含绿泥石,高岭石含量变化较大,对阿拉斯加西北部近海沉积物的影响明显;来自西伯利亚的物质富含绿泥石,对研究区西部沉积物的影响较为明显。自白令海峡进入的太平洋水携带富含蒙皂石的育空河物质横穿楚科奇海陆架向北扩散,导致楚科奇海中部沉积物中的蒙皂石含量高;同时,粘土矿物自身的粒度分异在某种程度上也促使蒙脱石在离岸距离较远的中部海区富集。The clay mineral distributions in sufrace sediments from the Chukchi Sea and adjacent arctic deep sea are controlled by the sediment source and marine circulation structure. The sediments in the northeastern and northern study area are affected greatly by the kaolinite- and illite-rich sediments from the Canadian Makenzie River, the offshore sediments along the northwest Alaska coast are affected significantly by the sediments from the northwest Alaska rivers and coast, which are rich in chlorite and have variable kaolinite contents, and the sediments in the western study area are affected significantly by the chlorite-rich Siberian materials. The Pacific water passing through the Bering Strait brings in the Yukon River materials rich in smectite to spread northward to result in the high content of smectite in the central Chukchi Sea sediments, and the differential sorting of clay minerals also promotes the enrichment of smectite in the central Chukchi Sea.

关 键 词：楚科奇海 北冰洋 表层沉积物 粘土矿物 物源 海洋环流 

分 类 号：P736.2[天文地球—海洋地质]