延边地区五道沟群变质英安岩的锆石SHRIMP U-Pb 年龄及其地质意义

SHRIMP U-Pb Ages of Zircon and Its Geological Implications from Metamorphic Dacite of the Wudaogou Group in Yanbian Area

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YU Jie-jiang,MEN Lan-jing,CHEN Lei,ZHAO Jun-kang,LIANG Shu-neng,CHEN Dong,PANG Wei

College of Earth Sciences, Jilin University,Changchun 130061, China

Received:2007-12-05 Revised:1900-01-01 Online:2008-05-26 Published:2008-05-26
Contact: YU Jie-jiang

Abstract: Zircons from the metamorphic dacite of the Wudaogou Group in Yanbian area have euhedralsubhedral shapes and high Th/U ratios (0.28-0.81), implying their magmatic origin. The dating of these zircons indicates that they can be divided into two groups according to their ages. One group,²⁰⁶Pb/²³⁸U ages of 10 spots ranging from (265±5)Ma to (291±5)Ma, the weighted mean age of (274±7)Ma (MSWD= 3.4), represents the formation time of the metamorphic dacite (the Early Permian), the other include three zircon grains, and its weighted mean 206Pb/²³⁸U age of is (323±37)Ma (MSWD = 3.6), should be interpreted as the captured zircon ages. Combining with the recently dating data, it is suggested that the Wudaogou Group formed in the Early Permian. Together with the Qinglongcun Group, it constitutes a volcanic-sedimentary formation in the Late Paleozoic continental margin.

Key words: Wudaogou Group, metamorphic dacite, U-Pb dating of zircon, Yanbian area

CLC Number:

P534

YU Jie-jiang,MEN Lan-jing,CHEN Lei,ZHAO Jun-kang,LIANG Shu-neng,CHEN Dong,PANG Wei. SHRIMP U-Pb Ages of Zircon and Its Geological Implications from Metamorphic Dacite of the Wudaogou Group in Yanbian Area[J].J4, 2008, 38(3): 363-0367.

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