大陆碰撞造山带镁铁质岩浆岩记录俯冲古洋壳物质再循环

戴立群; 赵子福

doi:10.3799/dqkx.2019.240

Volume 44 Issue 12

Dec. 2019

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Dai Liqun, Zhao Zifu, 2019. Mafic Igneous Rocks in Continental Collision Orogen Record Recycling of Subducted Paleo-Oceanic Crust. Earth Science, 44(12): 4128-4134. doi: 10.3799/dqkx.2019.240

Citation:

Dai Liqun, Zhao Zifu, 2019. Mafic Igneous Rocks in Continental Collision Orogen Record Recycling of Subducted Paleo-Oceanic Crust. Earth Science, 44(12): 4128-4134. doi: 10.3799/dqkx.2019.240

Dai Liqun, Zhao Zifu, 2019. Mafic Igneous Rocks in Continental Collision Orogen Record Recycling of Subducted Paleo-Oceanic Crust. Earth Science, 44(12): 4128-4134. doi: 10.3799/dqkx.2019.240

Citation:

Dai Liqun, Zhao Zifu, 2019. Mafic Igneous Rocks in Continental Collision Orogen Record Recycling of Subducted Paleo-Oceanic Crust. Earth Science, 44(12): 4128-4134. doi: 10.3799/dqkx.2019.240

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Mafic Igneous Rocks in Continental Collision Orogen Record Recycling of Subducted Paleo-Oceanic Crust

doi: 10.3799/dqkx.2019.240

Dai Liqun^,,
Zhao Zifu

CAS Key laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2019-08-30
Publish Date: 2019-12-15

Abstract

Abstract

It is of great significance to search for the evidence of paleo-oceanic crust recycling in collisional orogens to understand the geodynamic transition from oceanic subduction to continental subduction, and also the development of plate tectonics.This is illustrated by the petrology and geochemistry of Late Paleozoic and Late Mesozoic mafic magmatic rocks in the Tongbai-Hong'an orogens. The fluid metasomatism of subducted oceanic crust at sub-arc depth (80-160 km) was recorded by the Late Paleozoic mafic rocks, which are characterized by the arc-like trace element features and depleted radiogenic isotopes, while the melt metasomatism of subducted oceanic crust at post-arc depth (>200 km) was recorded by Late Mesozoic mafic rocks, which are characterized by the OIB-like trace element features and depleted-weakly enriched radiogenic isotopes. These qualitative interpretations are further confirmed by quantitative calculations, which indicates that the content of incompatible elements and the enrichment degree of radiogenic isotopes in mafic igneous rocks are mainly controlled by the nature and proportion of crustal components in the mantle sources. Therefore, the recycling of the subducted paleo-oceanic crust at sub-arc and post-arc depths, are confirmed by arc-like and OIB-like mafic igneous rocks in the collisional orogenic belt, respectively.
- collisional orogenic belt,
- mafic igneous rocks,
- recycling of paleo-oceanic crust,
- crust-mantle interaction,
- petrology

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References(29)

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