Depositional characteristics and model of the deep−water debris flow of the Mid−Late Jurassic Lagongtang Formation in the Nagqu area, Tibet

LI Fenqi; ZHENG Rongcai; ZHANG Shizhen; LI Jun; LIU Han; QIN Yadong

doi:10.12029/gc20201214001

2024 Vol. 51, No. 6

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LI Fenqi, ZHENG Rongcai, ZHANG Shizhen, LI Jun, LIU Han, QIN Yadong. 2024. Depositional characteristics and model of the deep−water debris flow of the Mid−Late Jurassic Lagongtang Formation in the Nagqu area, Tibet[J]. Geology in China, 51(6): 2028-2041. doi: 10.12029/gc20201214001

Citation:

LI Fenqi, ZHENG Rongcai, ZHANG Shizhen, LI Jun, LIU Han, QIN Yadong. 2024. Depositional characteristics and model of the deep−water debris flow of the Mid−Late Jurassic Lagongtang Formation in the Nagqu area, Tibet[J]. Geology in China, 51(6): 2028-2041. doi: 10.12029/gc20201214001

Depositional characteristics and model of the deep−water debris flow of the Mid−Late Jurassic Lagongtang Formation in the Nagqu area, Tibet

1.
Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China
2.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China

Fund Project: Supported by National natural science foundation of China (No.41972113, No.42002032) and the Second Qinghai−Tibet Scientific Research Project of the Ministry of Science and Technology of China (No.2019QZKK0706).

More Information

Author Bio: LI Fenqi, male, born in 1966, doctor, professor level senior engineer, engaged in basic geological research on Southern Qinghai−Tibet plateau; E−mail: lifenqi2012@163.com

Received Date: 14 December 2020

Revised Date: 20 January 2022

Publish Date: 25 November 2024

Abstract

Abstract

This paper is the result of oil and gas exploration engineering.
Objective
The research of deep–water debris flow deposition of the Mid–Late Jurassic Lagongtang Formation on the northern margin of the Lhasa Block is important for the reconstruction on the Mesozoic tectonics–palaeogeography in the southern Qinghai−Tibetan Plateau.
Methods
This study conducted field investigations and microstructural analyses on the debris flow deposition of the Lagongtang Formation in the Nagqu area, and discussed its controlling factors and transport processes with previous regional geological data, and further established its depositional model.
Results
The lower part of the debris flow deposition consists mainly of gravelly debris flow deposits, while its upper part is characterized by sandy debris flow deposits alternating with muddy debris flow deposits, containing abundant slip collapse and sliding bodies and have a typical double structure of soft deposition. The soft depositional deformation folds and pudding structure indicate the southward flow of the debris flow.
Conclusions
This study indicates that the formation of the Lagongtang Formation is controlled by the Bangonghu−Nujiang suture zone, and the "source−drain−sink" of different kinds of debris flow deposition shows coupling relationships to a certain extent. The study also provides new information on the reconstruction on the structure−paleogeography of the southern Qinghai−Tibetan Plateau in Mesozoic.
- oil gas geology /
- debris flow /
- slump deposits /
- Mid−Late Jurassic /
- Lagongtang Formation /
- oil and gas exploration engineering /
- Bangonghu–Nujiang suture zone /
- Tibet

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References

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