The redefinition and correlation of the Upper Triassic lithostratigraphic framework in the Qiangtang Basin, Xizang Plateau

ZHAN Wangzhong; WANG Zhongwei; SUN Wei; ZENG Shengqiang; XIE Shangke; HOU Qian; LI Lei

doi:10.16788/j.hddz.32-1865/P.2024.01.020

2025 Vol. 46, No. 2

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Article navigation > East China Geology > 2025 > 46(2): 191-221

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ZHAN Wangzhong, WANG Zhongwei, SUN Wei, ZENG Shengqiang, XIE Shangke, HOU Qian, LI Lei. 2025. The redefinition and correlation of the Upper Triassic lithostratigraphic framework in the Qiangtang Basin, Xizang Plateau. East China Geology, 46(2): 191-221. doi: 10.16788/j.hddz.32-1865/P.2024.01.020

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ZHAN Wangzhong, WANG Zhongwei, SUN Wei, ZENG Shengqiang, XIE Shangke, HOU Qian, LI Lei. 2025. The redefinition and correlation of the Upper Triassic lithostratigraphic framework in the Qiangtang Basin, Xizang Plateau. East China Geology, 46(2): 191-221. doi: 10.16788/j.hddz.32-1865/P.2024.01.020

The redefinition and correlation of the Upper Triassic lithostratigraphic framework in the Qiangtang Basin, Xizang Plateau

1.
Chengdu Center, China Geological Survey, Chengdu 610218, Sichuan, China
2.
School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China
3.
Qiangtang Institute of Sedimentary Basin, Southwest Petroleum University, Chengdu 610500, Sichuan, China
4.
State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS)，Nanjing 210008, Jiangsu, China

More Information

Corresponding author: WANG Zhongwei, wzwcdg@sina.com

Received Date: 18 January 2024

Revised Date: 01 July 2024

Accepted Date: 26 July 2024

Publish Date: 28 June 2025

Abstract

Abstract

The redefinition and correlation of Upper Triassic lithostratigraphic framework in Qiangtang Basin are key to understand their sedimentary-tectonic evolution and evaluate the oil-gas resources. The Late Triassic strata are widely distributed in Qiangtang Basin, but the researches on stratigraphic division and correlation are poor, which have hindered the regional geological understanding on the Qiangtang Basin. In this study, we systematically summarized all the Upper Triassic lithostratigraphic units on rock associations, sedimentary sequences, depositional environment, contact relation of strata, fossil, and chronostratigraphy based on the previous research and latest drilling data, and then redefined the Upper Triassic lithostratigraphic framework in the South and North Qiangtang, and finally proposed the new scheme of stratigraphic correlation. The data shows that the contact relation exists in both contemporaneous heterophase and top-bottom of the Upper Triassic strata in the Qiangtang Basin. In order to further understand the Upper Triassic lithostratigraphic framework of the Qiangtang Basin, we suggested using the Jiapila, Bolila, and Bagong Formations to represent the lower part of the Upper Triassic in the depression upward, while using the Xiaoqiebao, Jiaomuchaka, and Zana Formations in the central uplift area, which may be attributed to the Carnian-Norian age. In addition, the Nadi Kangri Formation is uniformly used to represent the Late Triassic Norian-Rhaetian volcanic-sedimentary sequence, which is parallel or angular unconformity with the lower strata. In addition, the Juhuashan Formation, Rigan Peico Formation and Suobucha Formations are still remained because these lithostratigraphic units have special significance on indicating sedimentary environment.
- Upper Triassic /
- lithostratigraphic framework /
- stratigraphic division and correlation /
- Qiangtang Basin

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