闽江下游及河口区表层沉积物粘土矿物含量分布特征及其环境意义  

Distribution characteristic of clay minerals contents in Minjiang River and its environmental significance

作　　者：冯华[1] 高爱国[1,2] 朱旭旭[1] 汪卫国[3] 倪冠韬 彭建平[1] 

机构地区：[1]厦门大学海洋与地球学院,福建厦门361102 [2]近海海洋环境科学国家重点实验室,福建厦门361102 [3]国家海洋局第三海洋研究所,福建厦门361005

出　　处：《应用海洋学学报》2014年第3期418-424,共7页Journal of Applied Oceanography

基　　金：国家自然科学基金资助项目(41076122;40976037;41376050)

摘　　要：为探究闽江下游及河口区粘土矿物的含量分布特征,于2009年在该区域采集表层沉积物样品25个,利用X射线衍射进行了粘土矿物的含量测定.结果表明粘土矿物的相对百分含量范围分别为：高岭石（33%-47%,平均值为42%）,伊利石（27%-43%,平均值为34%）,绿泥石（20%-29%,平均值为24%）,蒙脱石（0%-3%,平均值为1%）.在显著水平为0.01时,伊利石与高岭石、绿泥石的含量呈显著负相关关系,伊利石与高岭石的相关系数为-0.825,伊利石与绿泥石的相关系数为-0.611.通过对闽江下游及河口区粘土矿物含量分布的分析及与中国近海的粘土矿物含量分布对比,闽江下游及河口区粘土矿物的含量分布受物质来源、地形条件、介质环境、粘土矿物自身颗粒大小形态和人类活动的影响.相对于黄河和长江,闽江表层沉积物中具有较高的高岭石含量,较低的伊利石含量,与珠江的粘土矿物组合特征类似,这反映出气候效应的影响.In order to explore the distribution of clay minerals contents in Minjiang River, 25 surface sediment samples were collected in 2009. In this paper, clay mineral content of the Minjiang River was measured with X-ray diffraction. The result showed that clay minerals were composed of kaolinite （42%）, illite （34%）, chlorite（24% ） and montmorillonite （ 1% ）. There are good negative correlations of illite with kaolinite and with chlorite. At the significant level of 0.01, the correlation coefficient between illite and kaolinite is -0. 825, and the correlation coefficient between illite and chlorite is -0. 611. The terrigenous kaolinite and illite at sites near the estuary are determined and distributions of clay minerals contents between the Minjiang River and offshores in China compared. In addition to the matter source influence, the distribution of clay minerals contents in Minjiang River are affected by matter source, terrain conditions, depositional environment, particle size and shape of clay minerals and the anthropogenic impacts. In contrast to the Yellow River and the Yangtze River, Minjiang River, similar to that of the Pearl River, has higher content of kaolinite and lower content of illite which suggested the evident of climatic impacts.

关 键 词：海洋化学 表层沉积物 粘土矿物 分布特征 气候效应 闽江 

分 类 号：P734[天文地球—海洋化学]