【摘要】 粘土矿物成分组合及其X射线衍射谱特征的分析结果表明:在洱海这一断陷湖泊的不同地貌部位和沉积相带上,存在不同的粘土矿物。滨岸水下扇三角洲的沉积物中含有大量绿泥石;开阔的深水湖盆和弥苴河三角洲前缘沉积物中蒙脱石含量远比其它沉积部位要高。这一规律是洱海本身自然条件与粘土矿物的物理化学性质共同导致的结果。更多还原

【Abstract】 Erhai Lake located in west Yunnan Province is fault-bounded, with an area of 248.99 km2, maximum depth of 20.7 m and a mean depth of 10,167 m. Through XRD analysis of 67 samples, it is found that the main clay minerals in sediments of Erhai Lake are montmorillonite, illite, kaolinite and chlorite. But their distribution in different sedimentary facies belts presents evidently different features, that is, individual facies have their own clay minerals. The chlorit in deposits belonging to fan-deltaic front facies in the west lake bottom is predominately clay mineral because of the favourable conditions for chlorite preservation, such as near the material source and higher sedimentary rate etc. In contrast, the deposits with finest grain size in deep water area of the lake contain aboundant montmorillonite owing to the sedimentary environments and the properties of clay minerals.更多还原