造山带橄榄岩记录的大陆俯冲带多期壳幔相互作用

陈仁旭; 郑永飞

doi:10.3799/dqkx.2019.254

Volume 44 Issue 12

Dec. 2019

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Chen Renxu, Zheng Yongfei, 2019. Multiple Crust-Mantle Interaction in Continental Subduction Zones: Insights from Orogenic Peridotites. Earth Science, 44(12): 4095-4101. doi: 10.3799/dqkx.2019.254

Citation:

Chen Renxu, Zheng Yongfei, 2019. Multiple Crust-Mantle Interaction in Continental Subduction Zones: Insights from Orogenic Peridotites. Earth Science, 44(12): 4095-4101. doi: 10.3799/dqkx.2019.254

Chen Renxu, Zheng Yongfei, 2019. Multiple Crust-Mantle Interaction in Continental Subduction Zones: Insights from Orogenic Peridotites. Earth Science, 44(12): 4095-4101. doi: 10.3799/dqkx.2019.254

Citation:

Chen Renxu, Zheng Yongfei, 2019. Multiple Crust-Mantle Interaction in Continental Subduction Zones: Insights from Orogenic Peridotites. Earth Science, 44(12): 4095-4101. doi: 10.3799/dqkx.2019.254

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Multiple Crust-Mantle Interaction in Continental Subduction Zones: Insights from Orogenic Peridotites

doi: 10.3799/dqkx.2019.254

Chen Renxu^{1,2
,
,},
Zheng Yongfei^1,2

1.
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
2.
Center of Excellence for Comparative Planetology, Chinese Academy of Sciences, Hefei 230026, China

Received Date: 2019-08-31
Publish Date: 2019-12-15

Abstract

Abstract

Subduction zones are the major sites for mass exchange between crust and mantle. Although a great deal of studies have devoted to the crust-mantle interaction in oceanic subduction zones, it is still not clear what are physicochemical processes and mechanisms for the crust-mantle interactions in subduction zones. Orogenic peridotites are widely exposed in collisional subduction zones and they were originally located in the mantle wedge above the subducting continental slab, providing us excellent samples to resolve this issue. Through a systematic study of petrology and geochemistry for orogenic peridotites from the Dabie-Sulu and North Qaidam orogens, it is found that crustal metasomatism results in the occurrence of both newly grown zircon and relict zircon. The two types of zircons provide important constraints on not only the timing of crustal metasomatism but also the origin, property and composition of metasomatic agents in the mantle wedge. The mantle wedge peridotites in the continental subduction zones underwent multiple episodes of crustal metasomatism by different properties of fluids derived from the deeply subducted continental crust during continental collision. They were also metasomatized by fluids derived from precedingly subducted oceanic crust. They reacted with subducted continental crust-derived melts to generate garnet pyroxenites, which have high water contents and thus can serve as the mantle source of mafic igneous rocks with high water contents.
- orogenic peridotite,
- ultrahigh-pressure metamorphism,
- crust-mantle interaction,
- fluid action,
- subduction zone

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References(36)

References

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Multiple Crust-Mantle Interaction in Continental Subduction Zones: Insights from Orogenic Peridotites

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