念青唐古拉山主峰地区第四纪砾石层砾组分析

基金项目:

国土资源大调查项目"西藏纳木错地区第四纪环境演变调查研究"(编号:DKD2001006),"西藏当雄幅1:25万区域地质调查"(编号:DKD9901001)

FABRIC ANALYSIS OF GRAVEL IN QUATERNARY GRAVEL BEDS ON BACKBONE AREA OF NIQINGTANGGULASHAN MOUNTAINS

1. Institute of Geomechanics, CAGS research, Beijing 100081, China;
2. Iinstitute of Geology Geophysics, Academia of Sciences, Beijing 100029, China;
3. National Geological Museum of China, Beijing 100034, China;
4. The Land and Resources Department of the Xizang(Tibet) Autonomous Region, Lasa 850000, China

摘要: 通过对念青唐古拉山脉主峰地区的第四纪砾石层的砾组分析,作者从基岩地层和砾性分析、砾度和砾态分析中,阐述了念青唐古拉山脉北坡和南坡不同成因的第四纪砾石层的来源、成因及搬运方式。念青唐古拉山主峰地区的3次冰期砾石层中,每次冰期的冰碛物中的砾石在岩石成分、砾度、球度、风化程度上都有明显差异。这种差异反映了青藏高原隆升过程中对念青唐古拉山不同岩石的剥蚀作用。
- 第四纪 /
- 砾石层 /
- 砾组分析:念青唐古拉山 /
- 西藏
Abstract: The authors expound the source, the origin and the transport of different original Quaternary gravel beds in south and north of Nianqingtanggoulashan Mountains, from the bedrock strata, the compositional, the granulometric and the psephitic analysis, based on fabric analysis of Quaternary gravel beds on backbone area of Niqingtanggulashan Mountains. It is obvious difference in the rock composition, the grain sizes, the sphericity, the intensity of weathering on the 3 Gravel Beds of glacial epoch phases in the middle section of Nianqingtanggoulashan Mountains. This difference reflecs the denudation of the different rocks of Nianqingtanggoulashan Mountains in the doming of Qinghai-Xizang (Tibet) plateau.
- Quaternary /
- Gravel Beds /
- Fabric Analysis of gravel /
- Nianqingtanggoulashan Mountains