南阿尔金早古生代后碰撞花岗岩的成因及地质意义

徐楠; 吴才来; 赵苗苗; 刘畅

doi:10.3799/dqkx.2023.171

Volume 49 Issue 12

Dec. 2024

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Xu Nan, Wu Cailai, Zhao Miaomiao, Liu Chang, 2024. Genesis and Geological Significance of Post-Collision Granites in South Altun. Earth Science, 49(12): 4418-4433. doi: 10.3799/dqkx.2023.171

Citation:

Xu Nan, Wu Cailai, Zhao Miaomiao, Liu Chang, 2024. Genesis and Geological Significance of Post-Collision Granites in South Altun. Earth Science, 49(12): 4418-4433. doi: 10.3799/dqkx.2023.171

Xu Nan, Wu Cailai, Zhao Miaomiao, Liu Chang, 2024. Genesis and Geological Significance of Post-Collision Granites in South Altun. Earth Science, 49(12): 4418-4433. doi: 10.3799/dqkx.2023.171

Citation:

Xu Nan, Wu Cailai, Zhao Miaomiao, Liu Chang, 2024. Genesis and Geological Significance of Post-Collision Granites in South Altun. Earth Science, 49(12): 4418-4433. doi: 10.3799/dqkx.2023.171

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Genesis and Geological Significance of Post-Collision Granites in South Altun

doi: 10.3799/dqkx.2023.171

Xu Nan^{1, 2
,
,},
Wu Cailai^{2
,
,},
Zhao Miaomiao³,
Liu Chang⁴

1.
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Fair Competition Review Transaction Center of Henan Province, Zhengzhou 450000, China
4.
CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing Research Institute of Uranium Geology, Beijing 100029, China

Received Date: 2023-07-30
Available Online: 2025-01-09
Publish Date: 2024-12-25

Abstract

Abstract

The polarity of Early Paleozoic ocean-continent transformation in South Altun has been an issue recently. However, detailed petrological evidence for the exhumation of the deep subducted continental crust is still lacking. In this paper, it researches petrological, geochemical, zircon U-Pb chronological and Lu-Hf isotopic characteristics of the northern Manya complex, to discuss its source and tectonic environment, and reveal magmatic response to the Early Paleozoic tectonic evolution. The 458-420 Ma granites have similar material source and magmatic source, resulting from the similar ranges of ε_Hf (t) and t_DM2 values, and shoshonitic characteristics such as rich in alkali and K, and lack of Ti and Fe. The 458-453 Ma granites were formed by decompression melting of deep-subducted continental crust, which were transported to the upper crust by exhumation. The 451-420 Ma granites were product of partial melting of lower crustal materials triggered by underplating of mantle-derived magma in a post-collisional extensional environment. Thus, exhumation of the deep-subducted continental crust completed at < 453 Ma, and the orogenic belt were in late orogenic post-collisional environment at < 451 Ma.
- South Altyn,
- Early Paleozoic,
- exhumation,
- post-collisional,
- petrology,
- geochemistry

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Genesis and Geological Significance of Post-Collision Granites in South Altun

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