洁居纳卓组:西藏措勤地区的上新统岩石地层单位

基金项目:

中国地质调查局1∶25万措勤县幅区域地质调查(项目编号:20001300009171)

详细信息

Jiejunazhuo Formation: a Pliocene lithostratigraphic unit in the Coqen region, Xizang

Faculty of Earth Sciences, Chengdu University of Technology, Chengdu 610059, Sichuan, China

摘要: 分布于措勤县城一带的一套地层在1:100万日喀则幅区调中被划属上新统乌郁群,由下部火山岩和上部沉积岩组成。在1:25万措勤县幅区调中,根据获得的同位素年龄值已将下部火山岩地层划归古新统的典中组,而上部的沉积地层中含圆笠虫等有孔虫化石应属下白垩统。在这一地区还新发现一套陆相碎屑地层,根据其岩性组合、ESR年龄值及区域地层对比,本文将其新命名为上新统洁居纳卓组。
- 措勤 /
- 区域地质调查 /
- 上新统 /
- 洁居纳卓组 /
- 西藏
Abstract: The strata in the Coqen region, Xizang assigned to the Pliocene Wuyu Group in the Xigaze 1:1 000 000 Sheet consist of the lower volcanic rocks and upper sedimentary rocks. The former is assigned, on the basis of the isotopic ages obtained from the 1:250000 regional geological survey, to the Paleocene Dianzhong Formation, while the latter to the Lower Cretaceous strata in which the foraminifera such as Orbitolina occur. In addition, a sequence of continental clastic strata has also been newly identified in this area, which is named the Pliocene Jiejunazhuo Formation in terms of lithologic association, ESR dating and regional stratigraphic correlation.
- Coqen /
- regional geological survey /
- Pliocene /
- Jiejunazhuo Formation /
- Xizang