Geological Characteristics of Late Jurassic Volcanic Rocks in Sierbao-Baita Basin, West Liaoning Province and Its Response to Yanshan Movement

被引：0
|
作者：
Song Z. [1 ]
Zheng C. [1 ,2 ]
Lin B. [1 ]
Xu X. [1 ]
Liang C. [1 ,2 ]
Chen L. [1 ]
Zhao Y. [1 ,2 ]
Wen Q. [1 ]
机构：
[1] College of Earth Sciences, Jilin University, Changchun
[2] Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 10期
关键词：
North China craton; paleo-Pacific plate; petrology; tectonics; West Liaoning; Yanshan movement; zircon U-Pb age;
D O I：
10.3799/dqkx.2021.185
中图分类号：
学科分类号：
摘要：
The West Liaoning Province is located in the eastern part of the Yanshan orogenic belt, with large-scale Mesozoic volcanic-sedimentary basins. It is critical to study the transformation of the Yanshan movement tectonic regime, lithosphere thinning and craton destruction during the Mesozoic. In this paper it conducts a comprehensive study of the Late Jurassic volcanic rocks exposed in the Sierbao-Baita basin in West Liaoning from the aspects of the perspectives of petrography, zircon U-Pb chronology, geochemistry and zircon Hf isotopic composition, so as to determine the age of their formation, petrogenesis and tectonic setting, discusses the time of the subduction and rollback of the Paleo-Pacific plate to the eastern North China craton during the Late Mesozoic, which provides a reliable geological basis for further understanding the geodynamic mechanism of the Yanshan movement and Yanshanian magmatism. The formation age of the rhyolite exposed in the basin is 153.8-160.3 Ma, spatially distributed in NE direction, with high SiO2, Al2O3 and total-alkali contents, showing the characteristics of metaluminousperaluminous and high-K calc-alkaline. The samples are relatively enriched in large ion lithophile elements (LILEs: Rb, Ba, Pb, K) and light rare earth elements (LREEs), depleted in high field strength elements (HFSEs: Nb, Ta, P, Ti) and heavy rare earth elements (HREEs), with obvious Eu negative anomaly and low Cr, Co, Ni contents. Combined with the magmatic origin zircons exhibit negative εHf(t) value (-17.8 to -23.2) and old Hf isotopic two-stage model age (TDM2=2 334-2 697 Ma), all suggest that the primary magma may have originated from the partial melting of the Archaean or Proterozoic ancient lower crust. The Late Jurassic magmatism and tectonic movement in the West Liaoning Province were controlled by the subduction and rollback of the paleo-Pacific plate. The rhyolite in the Sierbao-Baita basin was formed in the NW direction compression tectonic setting caused by the subduction of the paleo-Pacific plate. At the same time, there are also a large number of metamorphic core complexes and extensional basins closely related to the rollback of the paleo-Pacific plate in the West Liaoning Province, suggesting the existence of an extensional regime in this region. Therefore, it hold that the tectonic regime of the Yanshan-West Liaoning area gradually changed from compression regime to extension regime in the Late Jurassic, which is a response to Yanshan movement. © 2023 China University of Geosciences. All rights reserved.
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页码：3689 / 3706
页数：17
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