黄河口及邻近渤海海域表层沉积物中CaO和蒙皂石分布及其对黄河入海物质运移的指示  

DISTRIBUTION OF CaO AND SMECTITE IN SURFACE SEDIMENTS OFF THE YELLOW RIVER MOUTH AND IN THE NEARBY BOHAI SEA AND THE IMPLICATIONS FOR DISPERSION OF THE RIVER SEDIMENTS TO THE SEA

作　　者：乔淑卿[1] 方习生[1] 石学法[1] 王昆山[1] 刘焱光[1] 刘升发[1] 朱爱美[1] 

机构地区：[1]海洋沉积与环境地质国家海洋局重点实验室 国家海洋局第一海洋研究所,青岛266061

出　　处：《海洋地质与第四纪地质》2010年第1期17-23,共7页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40806026);国家海洋局“908”专项(908-02-02-05);国家海洋公益项目(200805063)

摘　　要：利用X射线荧光和X射线衍射仪,对2007年8—9月取自现代黄河口及其邻近渤海海域的250个表层沉积物中的CaO和蒙皂石含量做了分析。结果表明,CaO和蒙皂石含量平面分布趋势相似,总体呈现由黄河口向东方向逐渐降低的趋势,依次可以划分出莱州湾西部高值区(Ⅰ区)、中间过渡区(Ⅱ区)和莱州湾东部低值区(Ⅲ区)。研究区沉积物中CaO和蒙皂石含量的这种分布特征,主要是黄河入海物质和水动力条件共同作用的结果。因此,该区域CaO和蒙皂石含量的分布不仅能反映黄河入海沉积物的运移,同时,对黄河口区的水动力条件有很好的指示意义。A large scale investigation of surface sediments was carried out off the Yellow River mouth and in the nearby Bohai Sea during August-September 2007. Approximately 250 samples were selected to determine CaO and smectite content using X-ray fluorescence spectrometry and X-ray diffraction. The analyzed data show that the CaO content distribution has similar occurrence to the smectite, which decreases seaward gradually from the Yellow River mouth. The study area can be classified into three provinces in terms of CaO and smectite contents. Provinces I from the river mouth to the central part of Laizhou Bay, is characterized by high contents of CaO and smectite,〉7.30% and 〉12.3% respectively. In contrast, the contents of CaO and smectite are as low as 〈5.62% and 〈10.8% in province III, which covers the eastern and southern Laizhou Bay. Province II is distributed between provinces I and III , where the contents of CaO and semctite range from 5.62% to 7.30% and from 10.8% to 12.3% respectively. The results demonstrate that the CaO and semctite contents in surface sediments of southern Bohai Sea can not only be used as indictors to trace the dispersion of the Yellow River sediments to the sea in the study area, but also has important implications of hydrodynamical conditions off the river mouth.

关 键 词：沉积物 碳酸钙 黏土矿物 莱州湾 黄河三角洲 

分 类 号：P736.21[天文地球—海洋地质]