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| Keywords | |
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central Jilin |
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Jifanggou metamorphic complex |
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zircon LA-ICP-MS U-Pb age |
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tectonic melange |
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| PubMed | |
Dating for Jifanggou metamorphic complex in central Jilin and its tectonic implications
WANG Zhongcheng1, LU Xiaoping3, ZHAO Juan2, TAO Junyu3, CHEN Mingjian1
1. The First Geological Survey of Jilin Province, Changchun 130033, China;
2. Regional Geology and Mineral Resources Survey of Jilin Province, Changchun 130022, China;
3. Nuclear Industry Geological Bureau of Jilin Province, Changchun 130062, China
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. metamorphic 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 concluded 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.