Clay Mineralogy and Its Geological Significance of Sediments in the
详细信息
- 责任者：Xu Yaoming (Faculty of Earth Science ; China University of Geoscience ; Wuhan 430074 ; China) ; Hong Hanlie
- 刊名：Acta Sedimentologica Sinica
- 出版年：2010
- 卷期：28(4)
- 关键词：前陆盆地 ; foreland basins ; 粘土矿物 ; clay minerals ; 昆仑山 ; Kunlun Mountains
- 页码：p.659-670
- 图表：5 illus., 1 plate, 51 refs.
- 分类号：0803
- issnNo：ISSN1000-0550
- isbnNo：CN62-1038/P
摘要
To reconstruct the evolution process of tectonics and paleoenvironment during the Late-Cenozoic time in West Kunlun area, clay mineralogy of the molasse sediments of the foreland basin of West Kunlun mountains was investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. The results show that clay minerals in sediments of 8～1.8 Ma B.P. are mainly illite and smectite, with minor chlorite and kaolinite, while their relative contents and illite crystallinity change apparently along the profile. It is concluded that changes in clay mineralogy of the Yecheng sediments were dominantly controlled by the changes of source rocks and, to some extent, by changes in climate around the area. The uplift of the West Kunlun is uneven and stepwise according to clay mineralogy of sediments. There were three times structural uplift events in the west Kunlun area, which had occurred around 3.5 Ma B.P., 3.3 Ma B.P. and 2.8 Ma B.P., respectively. In addition, an arid episode occurred around 2.5 Ma B.P. in the region.