西藏措勤地区侏罗系质疑

基金项目:

1∶25万《措勤县幅》区域地质调查(20001300009171)。

详细信息

Discussions on the Jurassic strata in the Coqen region, Xizang

摘要: 西藏措勤地区一直被认为有被分别称为达雄群和接奴群的中上侏罗统,然而在1:25万《措勤县幅》区调工作中,在该区的接奴群、达雄群中发现了较丰富的双壳、腹足、海胆、菊石及植物化石,这些化石组合具早白垩世生物群面貌。根据这些化石组合及地层对比,研究区内的接奴群和达雄群应划归下白垩统则弄群上部。
- 措勤 /
- 达雄群 /
- 接奴群 /
- 则弄群上部 /
- 西藏
Abstract: The strata in the Coqen region, Xizang have long been defined as the Middle and Upper Jurassic strata of the Daxiong and Jienu Groups. The authors argued, on the basis of abundant fossils including bivalves, gastropods, echinoids, ammonoids and plant remains found in these strata during the regional geological survey of the 1:250 000 Coqen Sheet, that the preceding fossils are characteristic of the features of the Early Cretaceous biotas. According to the fossil assemblages and stratigraphic correlation, the strata of the Daxiong and Jienu Groups should be redefined to the upper part of the Lower Cretaceous Zenong Group.
- Coqen /
- Daxiong Group /
- Jienu Group /
- the upper part of the Zenong Group /
- Xizang