超高压榴辉岩-脉体体系成因和俯冲带变质流体演化

郭顺; 唐盼; 陈意

doi:10.3799/dqkx.2019.238

Volume 44 Issue 12

Dec. 2019

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Guo Shun, Tang Pan, Chen Yi, 2019. Genesis of UHP Eclogite-Vein System and Metamorphic Fluid Evolution in Subduction Zones. Earth Science, 44(12): 4072-4080. doi: 10.3799/dqkx.2019.238

Citation:

Guo Shun, Tang Pan, Chen Yi, 2019. Genesis of UHP Eclogite-Vein System and Metamorphic Fluid Evolution in Subduction Zones. Earth Science, 44(12): 4072-4080. doi: 10.3799/dqkx.2019.238

Guo Shun, Tang Pan, Chen Yi, 2019. Genesis of UHP Eclogite-Vein System and Metamorphic Fluid Evolution in Subduction Zones. Earth Science, 44(12): 4072-4080. doi: 10.3799/dqkx.2019.238

Citation:

Guo Shun, Tang Pan, Chen Yi, 2019. Genesis of UHP Eclogite-Vein System and Metamorphic Fluid Evolution in Subduction Zones. Earth Science, 44(12): 4072-4080. doi: 10.3799/dqkx.2019.238

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Genesis of UHP Eclogite-Vein System and Metamorphic Fluid Evolution in Subduction Zones

doi: 10.3799/dqkx.2019.238

Guo Shun^{1,2
,
,},
Tang Pan^1,3,
Chen Yi^1,2

1.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2019-08-28
Publish Date: 2019-12-15

Abstract

Abstract

The system of ultrahigh-pressure (UHP) metamorphic rocks and veins is a natural laboratory to understand the nature and behavior of metamorphic fluids in subduction zones. This paper presents a review of the studies on three suits of eclogite (amphibolite)-vein system from the Dabie UHP terrane in order to discuss the dissolution and crystallization processes of subduction-zone metamorphic fluids, variation in fluid oxygen fugacity (f_O₂), and fluid-assisted boron (B) transfer. The study of UHP eclogites and enclosed multiple veins indicates that UHP fluid transferred materials by the dissolution of various components. This solute-rich fluid then experienced a three-stage crystallization process, which produced omphacite-epidote vein, epidote-quartz vein, and kyanite-epidote-quartz vein. La and Cr contents and δEu values of vein epidote are critical geochemical indicators for assessing the precipitating sequence of veins. The investigation on an eclogite-amphibolite-vein system indicates that low-pressure fluids have much higher f_O₂ conditions than high-pressure (HP) and UHP fluids in continental subduction zones. Such high f_O₂ conditions also lead to the growth of some unusual minerals (e.g., low pressure retrograde rutile). The investigation on tourmaline-bearing eclogite-vein system indicates that metacarbonate is an important reservoir of isotopically heavy boron (B) in subducted continental crust, and the release of B of metacarbonate at convergent boundary exerts a significant influence on deep B cycling. The studies above provide important insights into the fluid evolution and material cycling in subduction zones.
- UHP eclogite,
- vein,
- subduction-zone fluid,
- crystallization,
- oxygen fugacity,
- petrology,
- boron transfer

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References(54)

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