Late Eocene-Early Oligocene clay mineral characteristics and paleoclimate significance in Lunpola Basin, Tibet

LU Chang; XIA Guoqing; CHEN Yun; WU Jinxuan; BAO Wancheng; FAN Qiushuang; SHI Zhu; HAO Xiawei

doi:10.19826/j.cnki.1009-3850.2023.02021

2023 Vol. 43, No. 3

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Article navigation > Sedimentary Geology and Tethyan Geology > 2023 > 43(3): 565-579

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LU Chang, XIA Guoqing, CHEN Yun, WU Jinxuan, BAO Wancheng, FAN Qiushuang, SHI Zhu, HAO Xiawei. 2023. Late Eocene-Early Oligocene clay mineral characteristics and paleoclimate significance in Lunpola Basin, Tibet. Sedimentary Geology and Tethyan Geology, 43(3): 565-579. doi: 10.19826/j.cnki.1009-3850.2023.02021

Citation:

LU Chang, XIA Guoqing, CHEN Yun, WU Jinxuan, BAO Wancheng, FAN Qiushuang, SHI Zhu, HAO Xiawei. 2023. Late Eocene-Early Oligocene clay mineral characteristics and paleoclimate significance in Lunpola Basin, Tibet. Sedimentary Geology and Tethyan Geology, 43(3): 565-579. doi: 10.19826/j.cnki.1009-3850.2023.02021

Late Eocene-Early Oligocene clay mineral characteristics and paleoclimate significance in Lunpola Basin, Tibet

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China
2.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
3.
No.2 Oil Extraction Plant, Sinopec Northwest China Petroleum Bureau, Bayingol 841604, China
4.
Research Institute No.280, CNNC, Deyang 618300, China

More Information

Corresponding author: XIA Guoqing, xiaguoqing2012@cdut.cn

Received Date: 21 October 2022

Revised Date: 06 December 2022

Accepted Date: 06 December 2022

Publish Date: 30 September 2023

Abstract

Abstract

The Eocene-Oligocene Transition (EOT) is an important node of the Cenozoic climate transition from "greenhouse" to "icehouse" worldwide, especially on the Qinghai-Tibet Plateau and adjacent regions. In order to reconstruct the paleoclimatic evolution and controlling factors during the Eocene-Oligocene in the central hinterland of the Tibetan Plateau, clay mineral characteristics of 382 Daoban section in Lunpola Basin were analyzed by X-ray diffraction. Results show that the clay minerals deposited during the Eocene-Oligocene within the Second member of the Niubao Formation comprised of illite, illite/smectite mixed layers (I/S), kaolinite, chlorite and montmorillonite. Generally, the illite is the most abundant clay mineral, followed by I/S, while the kaolinite and chlorite contents are very low, and montmorillonite only appears in a few samples. Characteristics of clay minerals indicate that the Lumpola Basin was in a prolonged cold-dry climate conditions during this period, but a long-term decline in illite and rise in I/S contents indicating that the climate system in the central Tibetan Plateau changed to a more humid climate during this period. Such change could be related to the paleogeographic backgrounds of central Tibet and the evolution of South Asia monsoon since the late Eocene. However, at the EOT, illite content steeply increased, while the I/S content decreased and both fluctuated frequently, which reflects the influence of global cooling in the central Tibetan Plateau.
- Clay minerals /
- paleoclimate /
- Late Eocene-Early Oligocene /
- the central hinterland of the Tibetan Plateau /
- South Asia Monsoon

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References

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