大陆俯冲带大规模的变质流体活动:来自大别造山带超高压硬玉石英岩的记录

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doi:10.3799/dqkx.2019.242

Volume 44 Issue 12

Dec. 2019

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Article Navigation > Earth Science > 2019 > 44(12): 4064-4071

Gao Xiaoying, 2019. Large-Scale Flow of Metamorphic Fluids in a Continental Subduction Zone: Evidence from Coesite-Bearing Jadeite Quartzite in the Dabie Orogen. Earth Science, 44(12): 4064-4071. doi: 10.3799/dqkx.2019.242

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Gao Xiaoying, 2019. Large-Scale Flow of Metamorphic Fluids in a Continental Subduction Zone: Evidence from Coesite-Bearing Jadeite Quartzite in the Dabie Orogen. Earth Science, 44(12): 4064-4071. doi: 10.3799/dqkx.2019.242

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Large-Scale Flow of Metamorphic Fluids in a Continental Subduction Zone: Evidence from Coesite-Bearing Jadeite Quartzite in the Dabie Orogen

doi: 10.3799/dqkx.2019.242

Gao Xiaoying^,

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: 2019-08-29
Publish Date: 2019-12-15

Abstract

Abstract

Jadeite quartzite is a rare and fluid-related metamorphic rock, usually occurring as tectonic blocks of high-pressure (HP) to ultrahigh-pressure (UHP) metamorphic zones in continental and oceanic subduction zone.A combined study of whole-rock geochemistry, Mg and O isotopes, zircon U-Pb ages and trace elements was carried out for coesite-bearing jadeite quartzites from the Dabie orogen. The results indicate that the Middle Paleoproterozoic protolith of jadeite quartzites was weathered to a kind of sedimentary rocks in a passive continental margin and then underwent significant metasomatism by metamorphic fluids with high δ²⁶Mg values during the continental subduction in the Triassic. The metamorphic fluids were produced by the breakdown of biotite in the metasedimentary rocks. The regional occurrence of jadeite quartzites over an exposure area of about 50 km² indicates that the metamorphic fluids would have flowed on a large scale in the continental subduction channel. Such widespread fluid flow is evident in the continental subduction zone, with the metamorphic fluids would have flowed on a large scale at the slab-mantle interface in the continental subduction channel.
- continental subduction,
- fluid metasomatism,
- jadeite quartzite,
- UHP metamorphism,
- biotite breakdown,
- petrology

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References(26)

References

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