| 摘要: |
| 本文通过X射线衍射分析和ICP分析,研究了江苏省海岸沉积物的来源及粘土矿物组成特性、分布等,结果表明:老黄河沉积物对江苏海岸沉积物影响很大,分布在赣榆县至如东县岸段;目前长江输入的沉积物向上扩散范围较小,主要影响长江口至如东县岸段;海州湾主要受北运的老黄河沉积物影响,受沂沭河沉积物作用很小;黄河及长江沉积物入海水后都发生海洋沉积变质作用。 长江和老黄河沉积物的伊利石含量相近(68.0—72.0％),沂沭河沉积物则偏低(55.9—64.5％)。沂沭河沉积物含蒙脱石数量最高(22.6—25.0％),老黄河沉积 |
| 关键词: 沉积物 蒙脱石 高岭石 绿泥石 |
| DOI： |
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| A STUDY OF CHARACTERISTICS AND SOURCES OF CLAY MINERALS OF SEDIMENTS IN COASTAL AREAS OF JIANGSU PROVINCE |
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| Abstract: |
| Clay minerals of sediments in coastal environment of Jiangsu Province are analysed in this paper by means of X=ray diffraction and ICP method. The characteristics, sources and other aspects of sediments are also studied. The sediment of the Ancient Yellow River, distributed mainly over the shore from Ganyu County to Rudong County, greatly affects coastal sediments of Jiangsu province. The sediments of Yangtze River, generally distributed over the shore from Rudong County to the estuary does not reach far. The coast of Haizhou Bay was mainly built up with northward carried sediments of the Ancient Yellow River and was little affected by eluvial from the Yi and Shu river. The sediment of the Yellow River and the Yangtze river result in the metamorphosis of oceanogenic sedimentation after they are carried into sea water. The illite content of the sediments of the Yangtze River and that of the Ancient Yellow River is approximately the same(68.0-72.0%), while that of the Yi and Su Rivers is lower(55.9-64.5%). The montmorillonite content of the sediments of the Yi and su Rivers is the highest of the three(22.6-25.0%), followed by Yellow River(14.0-19.0%) and Yangtze river(4.4-7.6%). Significant differences of montmorillonite content may be regarded as a specific index distinguishing three kinds of sediments. The chlorite and Kaolinite contents of the sediment of the Yangtze River are higher than the other two, respectively 13.3-14.2% and 10.3-11.6%. The high value of the chlorite content is a feature of the sediment of the Yangtze River. There are several areas with high montmorillonite content, montmorillonite/(chlorite+kaolinite) ratio, silica-sesquioxide ratio and sillca-alumina ration on the shore from Xiangshui County to Dongtai County. |
| Key words: Sediment, Montmorillonite, Kaolinite, Chlorite |
