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논문 기본 정보

자료유형
학술저널
저자정보
Namkha Norbu (School of Earth Sciences and Resources Chang’an University Xi’an China) Yuegao Liu (Chinese Academy of Sciences) Jinchao Li (Xi’an Center of China Geological Survey China) Qunzi Jia (Xi’an Center of China Geological Survey) Wei Wang (Xinjiang Bureau of Geology and Mineral Exploration and Development China) Xiaobing Song (Geological Survey of Gansu Province Lanzhou China) Yazhi Li (Xi’an Center of China Geological Survey China) Huilei Kong (Xi’an Center of China Geological Survey China) Yijie Gao (Xi’an Center of China Geological Survey China) Xianzheng Guo (School of Resources and Environmental Engineering Hefei University of Technology China) Xuegang Yao (Zhejiang Geological Prospecting Institute of China Chemical Geology and Mine Bureau Hangzhou China)
저널정보
한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.25 No.6
발행연도
2021.12
수록면
763 - 786 (24page)
DOI
10.1007/s12303-021-0017-3

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초록· 키워드

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The East Kunlun orogenic belt (EKOB) is located in the northeastern part of the Qinghai-Tibetan Plateau, China. Voluminous Silurian?Devonian granitoids were formed during the Proto-Tethys Ocean subduction and collision process. In this study, zircon U-Pb age dating, in-situ Hf isotope analyses, and whole rock major and trace element analyses have been carried out on granitoids from the central to eastern EKOB. The formation ages of granodiorite in the Bairiqili area, the granodiorite in the Wulonggou area are 410 ± 2 Ma and 396 ± 1 Ma, respectively, and the granodiorites show I-type features. The Wulonggou syenogranite with a formation age of 398 ± 2 Ma has a high differentiation index (D.I. = 89.59?92.43), and may belong to the high fractionated I-type granite. The Lalangmai tonalite with a formation age of 423 ± 2 Ma has high Sr (339?590 μg/g), εHf(t) (1.5?7.3), and low Y (3.45?6.33 μg/g), which are similar to modern adakites. The Lalangmai tonalite is the latest adakite record during the Proto-Tethys evolution in EKOB. Combined with previous studies, it is concluded that the granitoids from Cambrian to Devonian divided into four episodes. The first episode (515?436 Ma) mainly consists of I-type island arc granites and adakite, which are formed in a subduction environment. The second episode (436?427 Ma) is characterized by the S-type granites related to the collision. The third episode (427?420 Ma) is the transition period between the collision and the post-collision environment. In the fourth episodes (420?385 Ma), granitoids were formed in post-collision extensional environment, which is characterized by I-type and A-type granites. The upwelling of asthenosphere material is likely caused by the collapse of the orogenic belt. After 420 Ma, I-type and A-type granites formed at different depths but in the same environment.

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