杭州湾潮滩沉积物黏土矿物空间差异与物源指示

发布时间：2018-05-21 17:51

  本文选题：杭州湾 + 潮滩沉积物　； 参考：《沉积学报》2016年02期

【摘要】：通过对杭州湾潮滩沉积物中主要黏土矿物成分及组合类型的研究,分析了杭州湾潮滩沉积物黏土矿物的空间分布特征。借助聚类分析等手段,同时结合杭州湾水动力特征,探讨了研究区黏土矿物的来源和成因。研究结果表明,杭州湾潮滩表层沉积物主要为黏土质粉砂,其余为砂质粉砂。本区沉积物黏土矿物成分复杂,主要为伊利石,其次是高岭石和绿泥石;还有少量蒙皂石和蛭石及1.4 nm过渡矿物。根据其相对含量可分为3种组合类型:Ⅰ型为伊利石—高岭石—绿泥石—蛭石类—蒙皂石型,Ⅱ型为伊利石—绿泥石—高岭石—蒙皂石—蛭石类型,Ⅲ型为伊利石—高岭石—绿泥石—蒙皂石—蛭石类型。在空间上,北岸的蒙皂石和绿泥石平均含量高于南岸,而伊利石、高岭石和蛭石(含1.4 nm过渡矿物)平均含量则低于南岸。高潮滩和中潮滩黏土矿物对比,除了蒙皂石含量高潮滩大于中潮滩外,其他矿物含量均无明显规律。表层沉积物黏土矿物的分布特征与水动力条件和物质来源密切相关,杭州湾北岸乍浦以东潮滩受潮流和长江沿岸流影响明显,沉积物主要为长江和东海源的;南岸由于曹娥江和甬江两条河流的注入,流域物质所占比例明显比北岸高。柱状岩芯样品中各黏土矿物含量自下而上的变化则反映了物源区风化强度的波动特征。
[Abstract]:The spatial distribution characteristics of clay minerals in tidal flat sediments of Hangzhou Bay were analyzed by studying the composition and assemblage types of clay minerals in tidal flat sediments of Hangzhou Bay. By means of cluster analysis and hydrodynamic characteristics of Hangzhou Bay, the origin and origin of clay minerals in the study area are discussed. The results show that the surface sediments of the tidal flat in Hangzhou Bay are mainly clay silt and the rest are sandy silt. The mineral composition of clay is complex, mainly Illite, followed by kaolinite and chlorite, and a small amount of montmorillonite and vermiculite, as well as 1.4 nm transition minerals. According to its relative content, it can be divided into three types: type I is Illite-kaolinite-chlorite-vermiculite-montmorillonite type, type II is Illite-chlorite-kaolinite-montmorillonite-vermiculite type. Type 鈪，

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