甘肃北山野马大泉志留纪花岗岩的成因和构造意义

黄博涛; 王国强; 卜涛; 过磊; 董增产; 王居里; 贺振宇

doi:10.3799/dqkx.2020.367

Volume 46 Issue 11

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(11): 3993-4005

Huang Botao, Wang Guoqiang, Bu Tao, Guo Lei, Dong Zengchan, Wang Juli, He Zhenyu, 2021. Petrogenesis and Tectonic Significance of Silurian Granites in Yemadaquan Area, Beishan, Gansu Province. Earth Science, 46(11): 3993-4005. doi: 10.3799/dqkx.2020.367

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Huang Botao, Wang Guoqiang, Bu Tao, Guo Lei, Dong Zengchan, Wang Juli, He Zhenyu, 2021. Petrogenesis and Tectonic Significance of Silurian Granites in Yemadaquan Area, Beishan, Gansu Province. Earth Science, 46(11): 3993-4005. doi: 10.3799/dqkx.2020.367

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Huang Botao, Wang Guoqiang, Bu Tao, Guo Lei, Dong Zengchan, Wang Juli, He Zhenyu, 2021. Petrogenesis and Tectonic Significance of Silurian Granites in Yemadaquan Area, Beishan, Gansu Province. Earth Science, 46(11): 3993-4005. doi: 10.3799/dqkx.2020.367

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Petrogenesis and Tectonic Significance of Silurian Granites in Yemadaquan Area, Beishan, Gansu Province

doi: 10.3799/dqkx.2020.367

1.
Research Center of Orogenic Geology, Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China
2.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
3.
Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2020-11-29
Available Online: 2021-12-04
Publish Date: 2021-11-30

Abstract

Abstract

The Mazongshan terrane is one of the main units of the Beishan orogenic collage. Among which there are abundant plutons, and they are of great significance for understanding and perfecting the Paleozoic tectonic framework of the Beishan orogenic collage. In this study, LA-ICP-MS zircon U-Pb dating yields the ²⁰⁶Pb/²³⁸U ages of 441±4 Ma and 425±2 Ma for the biotite monzogranite and hornblende monzogranite in Yemadaquan area respectively, which are the Early and Middle Silurian. The geochemical characteristics of the rocks show that they are sodium-rich, calc-alkalic, and magnesian. And their Ga/Al×10⁴ and Zr+Nb+Ce+Y values are less than those of the A-type granite. Especially diagnostic mineral amphibole appears in hornblende monzogranite, meaning they belong to I-type granite. The ε_Hf(t) values of their zircons are positive, and the crustal Hf model ages are concentrated at 0.94-1.42 Ga, suggesting that the Early-Middle Silurian granitic magmas may be derived from the partial melting of the Mesoproterozoic (~1.4 Ga) crust, with the participation of mantle-derived magmas. The analyses from geochemistry and regional data show that the granites were formed in the tectonic setting of continental arc, and the spatial and temporal distribution of Paleozoic granites suggests that slab roll-back might occur in the Early Carboniferous.
- Beishan orogenic collage,
- Mazongshan terrane,
- Silurian,
- I-type granite,
- continental arc,
- tectonics

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