西藏尼玛县荣玛乡原康托组的划分及沉积相分析

发布时间：2018-02-01 09:54

本文关键词： 西藏康托组阿布山组牛堡组沉积相　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：论文依托1:5万区域地质填图,研究西藏尼玛县荣玛乡原康托组沉积相与沉积环境,取得以下主要成果和认识:(1)在野外实测的基础上,根据岩性、岩相特征及区域地层对比,对研究区原“康托组”进行了厘定,将其自下而上划分为下白垩统阿布山组、古近系始新统-始新统牛堡组和新近系康托组。(2)根据岩性、沉积构造及含化石特征,在阿布山组、牛堡组与康托组划分出3个沉积相、6个沉积亚相和11个沉积微相。(3)根据剖面相序结构分析,认为原“康托组”至少可以划分出5个沉积旋回,其中阿布山组1个、牛堡组3个、康托组1个。考虑到研究区各组均无顶无底,实际旋回数应更多。
[Abstract]:Based on the regional geological mapping of 1: 50 000, this paper studies the sedimentary facies and sedimentary environment of the original Kangto formation in Rongma Township, Nima County, Tibet. The main achievements and understanding are as follows: (1) on the basis of field measurements, according to lithology. Lithofacies characteristics and regional stratigraphic correlation, the former "Kangto formation" in the study area was determined and divided from the bottom to the top into the lower Cretaceous Abu Mount formation. Paleogene Eocene Eocene Niupu formation and Neogene Kangto formation. 2) according to lithology, sedimentary structure and fossil bearing characteristics, there are three sedimentary facies in Abu Shan formation, Niupu formation and Kanto formation. 6 sedimentary subfacies and 11 sedimentary microfacies. According to the analysis of facies sequence structure of the section, it is considered that the original "Kangto formation" can be divided into at least 5 sedimentary cycles, of which 1 is the Abu Mountain formation and 3 are the Niupu formation. Conto group 1. Considering that there is no top and bottom in each group in the study area, the actual cycles should be more.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P512.2;P535

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