Dating for Jifanggou metamorphic complex in central Jilin and its tectonic implications |
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| Authors: | WANG Zhongcheng LU Xiaoping ZHAO Juan TAO Junyu CHEN Mingjian |
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| Institution: | 1. The First Geological Survey of Jilin Province, Changchun 130033, China;2. Nuclear Industry Geological Bureau of Jilin Province, Changchun 130062, China;3. Regional Geology and Mineral Resources Survey of Jilin Province, Changchun 130022, China |
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| Abstract: | Based on the results of four regional geological surveys of 1:50000 including Shulan County map in Jilin, taking Shulan area as the study area ,the authors re-delineated the rock type assemblages , e.g.metamor-phic rhyolite, metamorphic tuffaceous breccia lava , sericite-quartz schist and tremolite altered rock , etc., and the structural contacts between them .With the help of in-situ LA-ICP-MS U-Pb dating for zircons , it is conclu-ded that the zircon crystallization ages of the metamorphic rhyolite , the metamorphic andesitic tuff breccia lava and the tremolite altered rock are 339.1 ±1.3 Ma(n=27,MSWD=0.78),351.8 ±1.7 Ma(n=21,MSWD=0.82),and 362.0 ±1.8 Ma(n=43, MSWD=2.2) respectively.The metamorphic complex is actually a set of tectonic melange which comprises the rocks in different types , sources, times, or tectonic settings , and was formed by tectonism . |
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| Keywords: | central Jilin Jifanggou metamorphic complex zircon LA-ICP-MS U-Pb age tectonic melange |
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