念青唐古拉山主峰地区第四纪砾石层砾组分析

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。 

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

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.