西藏班戈寒武纪辉长闪长岩体的发现及其构造意义

豆孝芳; 陈鑫; 郑有业; 姜晓佳; 王进寿; 郑顺利; 任欢; 杨成; 朱继华

doi:10.3799/dqkx.2019.247

Volume 45 Issue 6

Jun. 2020

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Article Navigation > Earth Science > 2020 > 45(6): 2091-2102

Dou Xiaofang, Chen Xin, Zheng Youye, Jiang Xiaojia, Wang Jinshou, Zheng Shunli, Ren Huan, Yang Cheng, Zhu Jihua, 2020. The Newly Discovered Cambrian Gabbro-Diorite in Bange, Tibet and Their Tectonic Implications. Earth Science, 45(6): 2091-2102. doi: 10.3799/dqkx.2019.247

Citation:

Dou Xiaofang, Chen Xin, Zheng Youye, Jiang Xiaojia, Wang Jinshou, Zheng Shunli, Ren Huan, Yang Cheng, Zhu Jihua, 2020. The Newly Discovered Cambrian Gabbro-Diorite in Bange, Tibet and Their Tectonic Implications. Earth Science, 45(6): 2091-2102. doi: 10.3799/dqkx.2019.247

Citation:

Dou Xiaofang, Chen Xin, Zheng Youye, Jiang Xiaojia, Wang Jinshou, Zheng Shunli, Ren Huan, Yang Cheng, Zhu Jihua, 2020. The Newly Discovered Cambrian Gabbro-Diorite in Bange, Tibet and Their Tectonic Implications. Earth Science, 45(6): 2091-2102. doi: 10.3799/dqkx.2019.247

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The Newly Discovered Cambrian Gabbro-Diorite in Bange, Tibet and Their Tectonic Implications

doi: 10.3799/dqkx.2019.247

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Qinghai Geological Survey Institute, Xining 810017, China
4.
Hubei Institute of Geological Survey, Wuhan 430034, China
5.
Hunan Institute of Geological Survey, Changsha 410000, China

Received Date: 2019-06-08
Publish Date: 2020-06-15

Abstract

Abstract

The Bange area is part of North Lhasa terrane. Cambrian magmatism has not been reported in the north Lhasa terrane. In this study, field geological survey and geochemical studies, as well as geochronology, were used to study the firstly discovered gabbro-diorite in Bange and the following conclusions are drawn. The gabbro-diorites belong to the high-K calc-alkaline series. They are rich in large ion lithophilic elements (e.g., Rb and Ba) and light rare earth elements (e.g., La and Ce), and are depleted in high-field strength elements (e.g., Nb, Ta, Zr, Hf and Ti), similar to the Andean island arc magmatic rocks. The rock is interpreted as resulting from partial melting of subduction sediments metasomatized with the overlying mantle wedge. Zircon U-Pb dating demonstrates that the gabbro-diorite formed at 512±3 Ma, which indicates it formed at Cambrian and provides reliable chronological evidence for the existence of Early Paleozoic magmatic events in the North Lhasa terrane. It is confirmed that the North Lhasa terrane is part of northern margin of the Gondwana land. The results provide a new window for further study of the evolution of the tectonic of Tibetan Plateau.
- gabbro-diorite,
- Cambrian,
- tectonic implication,
- Bange district,
- Tibet,
- petrology

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References(52)

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