北大别黄土岭长英质麻粒岩的原岩、变质作用及源区热事件年龄的锆石LA-ICPMS U-Pb测年约束

陈能松; 刘嵘; 孙敏; 李惠民; 何蕾; 王勤燕; 张宏飞

Volume 31 Issue 3

May 2006

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Article Navigation > Earth Science > 2006 > 31(3): 294-300

CHEN Neng-song, LIU Rong, SUN Min, LI Hui-min, HE Lei, WANG Qin-yan, ZHANG Hong-fei, 2006. LA-ICPMS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance. Earth Science, 31(3): 294-300.

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LA-ICPMS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
4.
Institute of Geology and Mineral Resources of Tianjin, Tianjin 300170, China

Received Date: 2005-08-29
Publish Date: 2006-05-25

Abstract

Abstract

LA-ICPMS U-Pb dating was conducted on three textural domains in zircon from a high-temperature high-pressure felsic granulite in the Huangtuling area, North Dabieshan, Central China. The metamorphic growth-derived detrital zircon domain yielded a ²⁰⁷Pb/²⁰⁶Pb age in the range of (2 493±54) - (2 500±180) Ma. The magmatic genesis-derived detrital zircon domain gave a ²⁰⁷Pb/²⁰⁶Pb age ranging from 2 628 Ma to 2 690 Ma, with an oldest ²⁰⁶Pb/²³⁸U age of (2 790±150) Ma. The metamorphic overgrowth or metamorphic recrystallization zircon domain yielded a discordia with an upper intercept age of (2 044.7±29.3) Ma. Compositions of the mineral assemblage, major element geochemistry, and an especially complex interior texture of zircon suggest that the protolith of the felsic granulite is of sedimentary origin. The protolith material of the granulite came from a provenance with a complex thermal history, i.e. 2.8 Ga magmatism and 2.5 Ga metamorphism, and deposited in a basin not earlier than 2.5 Ga. The high-temperature and high-pressure granulite-facies metamorphic age was precisely constrained at (2.04±0.03) Ga, which indicates the granulite in Huangtuling area should be a relict of the Paleoproterozoic UHT metamorphosed slab.
- LA-ICPMS U-Pb zircon dating,
- ages of protolith and granulite-facies metamorphism,
- provenance,
- felsic granulite,
- North Dabieshan.

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致谢: 锆石年龄的意义解释和黄土岭麻粒岩的变质过程曾与中国科学院地质与地球物理所的叶凯教授进行过有益的交流.匿名评审人对本文手稿提出了建设性意见.

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LA-ICPMS U-Pb Zircon Dating for Felsic Granulite, Huangtuling Area, North Dabieshan: Constraints on Timing of Its Protolith and Granulite-Facies Metamorphism, and Thermal Events in Its Provenance

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