古地理学报 ›› 2000, Vol. 2 ›› Issue (3): 37-44. doi: 10.7605/gdlxb.2000.03.004

• 岩相古地理学及沉积学 • 上一篇    下一篇

藏南江孜盆地晚侏罗至早白垩世重力流沉积

彭勇民   李金高    姚鹏   

  1. 1.中国矿业大学; 徐州221008;
    2.西藏地质矿产厅,850000;
    3.成都地质矿产研究所,610082
  • 出版日期:2000-06-01 发布日期:2000-06-01
  • 作者简介:彭勇民,男,1965年生。1999年毕业于成都理工学院,获博士学位。现为中国矿业大学博士后和成都地质矿产研究所副研究员,主要从事青藏高原沉积学、构造地质学与火山学等科研工作。
  • 基金资助:

     西藏科委重点项目(990107)与国土资源部定向基金项目(97042)联合资助。

Gravity flow Sediments of Late Jurassic-Early Cretaceous of Jomzi basin in southern Tibet

Peng  Yongmin     Li  Jingao Yao  Peng   

  1. 1.China University of Mining and Technology;
    2.Tibet Bureau of Geology and Mineral Resources)
    3. Chengdu Institute of Geology and Mineral Resources
  • Online:2000-06-01 Published:2000-06-01
  • About author:Peng Yongmin, born in 1965,graduated from Chengdu University of Technology in 1999,and obtained the Ph.D. degree. Now he is a post-PH.D. of China University of Mining and Technology, and an assistant professor of Chengdu Institute of Geology and Mineral Resources, and engages in sedimentology, tectonics and volcanology.

摘要:

西藏南部江孜盆地的沙拉岗矿区发育一套晚侏罗至早白垩世的碎屑流、滑动流与浊流等重力流沉积,主要由斜坡相碎屑岩夹硅质岩和灰岩构成。在这个斜坡背景中出现了上斜坡相,下斜坡相与海底扇相等3种类型的岩相组合。其中,上斜坡以各种规模的滑动沉积为特色,下斜坡以不同性质的碎屑流沉积为特征。海底扇具有完整的内扇、中扇与外扇组合,可划分出进积型和退积型两种序列类型,它们多半是由浊流形成的各种砂体组成的。

Abstract:

The well-known gravity flow sediments were formed by the debris, sliding and turbidity flows in Late Jurassic-Early Cretaceous in Shalagang mining area of Jomzi basin in southern Tibet, which consisted of the slope clastic rocks and interbeds of siliceous rocks and limestones. Three kind lithofacies assemblages of upper slope, lower slope and submarine fan emerged in the slope. The upper slope was characterized by all kinds of sliding sediments and lower slope by all kinds of debris flow sediments. The submarine fan that had completely inner, middle and outer fan can be divided into progressive and regressive sequence, which were composed of sandstone bodies formed by turbidity flow.