北秦岭超高压榴辉岩中长英质脉体的锆石U-Pb年龄及其地质意义

何宇; 赵宇洁; 张文祥; 王浩; 周光颜; 吴元保

doi:10.3799/dqkx.2017.597

Volume 43 Issue 2

Feb. 2018

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Article Navigation > Earth Science > 2018 > 43(2): 389-400

He Yu, Zhao Yujie, Zhang Wenxiang, Wang Hao, Zhou Guangyan, Wu Yuanbao, 2018. Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications. Earth Science, 43(2): 389-400. doi: 10.3799/dqkx.2017.597

Citation:

He Yu, Zhao Yujie, Zhang Wenxiang, Wang Hao, Zhou Guangyan, Wu Yuanbao, 2018. Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications. Earth Science, 43(2): 389-400. doi: 10.3799/dqkx.2017.597

Citation:

He Yu, Zhao Yujie, Zhang Wenxiang, Wang Hao, Zhou Guangyan, Wu Yuanbao, 2018. Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications. Earth Science, 43(2): 389-400. doi: 10.3799/dqkx.2017.597

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Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications

doi: 10.3799/dqkx.2017.597

He Yu^{1,2
,},
Zhao Yujie^1,2,
Zhang Wenxiang^1,2,
Wang Hao^3,4,
Zhou Guangyan^1,2,
Wu Yuanbao^{1,2
,
,}

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Lithospheric Evolution, Chinese Academy of Sciences, Beijing 100029, China
4.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 2017-10-24
Publish Date: 2018-02-15

Abstract

Abstract

The Early Paleozoic high pressure (HP) to ultrahigh pressure (UHP) metamorphism in the North Qinling (NQ) terrane preserves the oldest UHP record in the whole Qinling-Tongbai-Hong'an-Dabie-Sulu orogenic belt and thus registers the first accretionary collision process between the South China block (SCB) and the North China block (NCB).However, its evolution processes remain the subject of heated debate.This paper presents an integrated study of CL image, trace elements, and U-Pb age of zircons from a felsic vein within a UHP eclogite outcrop from the Guanpo area, NQ terrane.Zircons from the vein are euhedral in shape, displaying oscillatory, planar or no zoning, high U but low Th contents resulting in low Th/U ratios, indicating that they precipitated from hydrous melts responsible for the vein formation.In addition, these metamorphic zircons are characterized by low LREE contents, relatively high HREE patterns, and significant negative Eu anomalies, suggesting the hydrous melts formed during the amphibolite-facies retrogression.The weighted mean ²⁰⁶Pb/²³⁸U age of 494±10 Ma of these zircons is similar to the age of the peak UHP metamorphism (490.4±5.8 Ma) of the NQ unit, within the analytical error.Based on the above observations, we suggest that the NQ terrane underwent fast exhumation after deep subduction in the Early Paleozoic, and released hydrous melts derived from partial melting during exhumation, which was triggered by the significant amphibolite-faices retrogression.
- North Qinling,
- felsic vein,
- zircon U-Pb age,
- zircon trace element,
- fast exhumation,
- geochemistry,
- geochronology

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References(70)

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Zircon U-Pb Ages of A Felsic Vein in Ultrahigh-Pressure Eclogite from North Qinling Terrane and Their Geological Implications

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