Characteristics of Mesozoic Differential Tectonic Uplift of the North Section of Longmen Mountains, Western Sichuan Basin

JIN Wen-Zheng; BAI Wan-Kui; YE Zhi-Xu

doi:10.3969/j.issn.2097-0013.2023.04.001

2023 Vol. 39, No. 4

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JIN Wen-Zheng, BAI Wan-Kui, YE Zhi-Xu. 2023. Characteristics of Mesozoic Differential Tectonic Uplift of the North Section of Longmen Mountains, Western Sichuan Basin. South China Geology, 39(4): 589-600. doi: 10.3969/j.issn.2097-0013.2023.04.001

Citation:

JIN Wen-Zheng, BAI Wan-Kui, YE Zhi-Xu. 2023. Characteristics of Mesozoic Differential Tectonic Uplift of the North Section of Longmen Mountains, Western Sichuan Basin. South China Geology, 39(4): 589-600. doi: 10.3969/j.issn.2097-0013.2023.04.001

Characteristics of Mesozoic Differential Tectonic Uplift of the North Section of Longmen Mountains, Western Sichuan Basin

1. School of Energy Resources, China University of Geosciences, Beijing 100083, China
2. National Key Laboratory of Petroleum Resource and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
3. Geophysical Research Institute of Sinopec Shengli Oilfield Branch, Dongying 257000, Shandong, China
4. Jidong Oilfield Branch Company, PetroChina, Tangshan 063200, Hebei, China

Received Date: 13 June 2023

Revised Date: 25 June 2023

Abstract

Abstract

Longmen Mountains thrust belt, located in western Sichuan province, has experienced many complex stages of tectonic evolution and developed multiple large faults. In order to discuss the differential tectonic uplift among the main faults in the northern section of Longmen Mountains since Mesozoic, this paper has carried out zircon fission track dating and calculated several uplift parameters such as cooling rate etc. The research results show that the zircon fission track ages are mainly among 238~122 Ma. The cooling rates of the core of Tangwangzhai Syncline and Yangtianwo Syncline are 1.211~1.438 ℃/myr, and the denudation rate is during 0.038~0.048 mm/yr there. The cooling rates and denudation rates of the northwest wing of the synclines are relatively higher, which are 1.150~1.586 ℃/myr and 0.038~0.053 mm/yr respectively. In general, the zircon fission track age, cooling rate and rock uplift amplitude are banded in the plane and parallel to the main faults. The uplift parameters vary in different regions sandwiched by the Qingchuan Fault, Beichuan Fault, and Jiangyou Fault, while the structural deformation is characterizeds by both "Piggyback propagation" and "Overstep propagation" from the northwest to the southeast. The deformation transition from the piggyback propagation to the overstep propagation is between 139 Ma and 122 Ma.
- zircon /
- fission track /
- tectonic uplift /
- Mesozoic /
- Beichuan fault /
- Jiangyou fault /
- Longmen Mountains

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