柴北缘鱼卡含硬柱石假象榴辉岩的发现、<i>P-T-t</i>轨迹及控制硬柱石形成的主要因素

任云飞; 陈丹玲; 宫相宽; 刘良

doi:10.3799/dqkx.2019.251

Volume 44 Issue 12

Dec. 2019

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Article Navigation > Earth Science > 2019 > 44(12): 4009-4016

Ren Yunfei, Chen Danling, Gong Xiangkuan, Liu Liang, 2019. Discovery and P-T-t Paths of Lawsonite Pseudomorph-Bearing Eclogites in the Yuka Terrane, North Qaidam Ultrahigh Pressure Metamorphic Belt and Exploration on Key Factors Controlling Lawsonite Formation. Earth Science, 44(12): 4009-4016. doi: 10.3799/dqkx.2019.251

Citation:

Ren Yunfei, Chen Danling, Gong Xiangkuan, Liu Liang, 2019. Discovery and P-T-t Paths of Lawsonite Pseudomorph-Bearing Eclogites in the Yuka Terrane, North Qaidam Ultrahigh Pressure Metamorphic Belt and Exploration on Key Factors Controlling Lawsonite Formation. Earth Science, 44(12): 4009-4016. doi: 10.3799/dqkx.2019.251

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Discovery and P-T-t Paths of Lawsonite Pseudomorph-Bearing Eclogites in the Yuka Terrane, North Qaidam Ultrahigh Pressure Metamorphic Belt and Exploration on Key Factors Controlling Lawsonite Formation

doi: 10.3799/dqkx.2019.251

State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

Received Date: 2019-09-10
Publish Date: 2019-12-15

Abstract

Abstract

Lawsonite is a representative mineral in cold oceanic subduction zone. It contains high water and trace element contents,such as Sr,Pb,and REE,and thus its formation and breakdown greatly influence fluid activity in subduction channel,deep water and trace element recycling,metasomatism and partial melting of mantle wedge as well as arc volcanism. However,lawsonite-bearing eclogite is rarely exposed because lawsonite is very delicate that seldom survives exhumation. In this paper,we summarize the methods to identify former presence of lawsonite in eclogite and determine that clinozoisite eclogite and kyanite-bearing eclogite in the Yuka terrane,North Qaidam UHPM belt (NQUB) are retrograde products of lawsonite eclogite. This makes the NQUB being the second continental subduction-type orogenic belt which contains lawsonite eclogite. Phase equilibrium modelling obtains clockwise P-T paths for these two eclogites. The P-T path and peak metamorphic conditions of the kyanite-bearing eclogite are similar to the coesite-bearing phengite eclogite in the Yuka terrane,whereas the clinozoisite eclogite has slightly lower peak P-T conditions. Zircon dating yields metamorphic ages of 437 Ma and 436 Ma for the kyanite-bearing eclogite and clinozoisite eclogite,respectively,which are similar to UHP eclogite facies metamorphic ages in the NQUB,and a protolith age of 1 273 Ma for the kyanite-bearing eclogite. The similar P-T path and metamorphic age of the kyanite-bearing eclogite with coesite-bearing eclogite indicate that these two eclogites underwent continental deep subduction together. This results show that lawsonite eclogite is not peculiar to oceanic cold subduction zone. The main factors controlling the formation of lawsonite eclogite are bulk composition and metamorphic conditions. In the Yuka terrane,eclogite with high Mg^# favors lawsonite-bearing peak assemblage.
- lawsonite pseudomorph,
- eclogite,
- P-T-t path,
- Yuka terrane,
- North Qaidam,
- pertology

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References(33)

References

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