碰撞后岩浆作用与陆壳生长：以柴北缘超高压变质带为例

周辰傲; 宋述光

doi:10.3799/dqkx.2022.117

Volume 48 Issue 12

Dec. 2023

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Article Navigation > Earth Science > 2023 > 48(12): 4481-4494

Zhou Chen'ao, Song Shuguang, 2023. Post-Collision Magmatism and Continental Crust Growth in Continental Orogenic Belt: An Example from North Qaidam Ultrahigh-Pressure Metamorphic Belt. Earth Science, 48(12): 4481-4494. doi: 10.3799/dqkx.2022.117

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Zhou Chen'ao, Song Shuguang, 2023. Post-Collision Magmatism and Continental Crust Growth in Continental Orogenic Belt: An Example from North Qaidam Ultrahigh-Pressure Metamorphic Belt. Earth Science, 48(12): 4481-4494. doi: 10.3799/dqkx.2022.117

Citation:

Zhou Chen'ao, Song Shuguang, 2023. Post-Collision Magmatism and Continental Crust Growth in Continental Orogenic Belt: An Example from North Qaidam Ultrahigh-Pressure Metamorphic Belt. Earth Science, 48(12): 4481-4494. doi: 10.3799/dqkx.2022.117

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Post-Collision Magmatism and Continental Crust Growth in Continental Orogenic Belt: An Example from North Qaidam Ultrahigh-Pressure Metamorphic Belt

doi: 10.3799/dqkx.2022.117

Zhou Chen'ao,
Song Shuguang^{,
,}

Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China

Received Date: 2022-02-17
Available Online: 2024-01-03
Publish Date: 2023-12-25

Abstract

Abstract

The post-collision magmatic activity is of great significance to understand the orogenic collapse, delamination and continental crust growth. In this paper it summarizes the geochronological and geochemical characteristics of post-collisional magmatism at 400-360 Ma in the North Qaidam ultrahigh-pressure metamorphic belt. The granite intrusions have I-type characteristics and were formed by the crust-mantle magmatic mixing. Mafic dykes can be divided into two groups: (1) Intermediate-basic dykes at 392-375 Ma; (2) Ultrabasic dykes about 360 Ma. The geochemical characteristics show that the trace elements and isotopes of mafic dyke are gradually depleted with time, and the mantle source changes from lithospheric mantle to asthenosphere mantle. The mafic magmatic activity is the key of post-collision magmatic activity and orogen collapse. Combining the feature of magmatism after the collision, it proposes a geodynamic model to explain the activities of lithosphere and asthenosphere mantle in post-collision stage about 35 million years (Ma), the unrooting process of orogeny began at slow lithospheric mantle erosion in 395-375 Ma, and ended up with lithosphere delamination and asthenosphere upwelling at 360 Ma. The addition of mantle magma indicates that the post-collision stage is an important period for continental growth in earth history.
- continental collision,
- post-collisional magmatism,
- orogenic collapse,
- delamination,
- continental growth,
- petrology,
- geochemistry

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References(53)

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