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| Authors | |
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WANG Yang |
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MA Rui |
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HE Zhong-Hua |
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CHEN Fei |
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SUI Jia-Xuan |
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GAO Bo |
| PubMed | |
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Article by Wang, Y. |
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Article by Ma, R. |
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Article by He, Z. H. |
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Article by Chen, F. |
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Article by Sui, J. X. |
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Article by Gao, B. |
��esearch on geological characteristics and zircon U-Pb age of Jiageda Formation in Taerqi��Inner Mongolia
WANG Yang, MA Rui, HE Zhong-Hua, CHEN Fei, DUO Jia-Han, GAO Bo
College of Earth Sciences��Jilin University��Changchun 130061��China
The authors studied the characteristics including petrology��tectonics��geochemistry and zircon U- Pb dating��and discussed deformation features��regional tectonic background and formation age for the Jiageda Formation in Tarqi areas�� The results show that the Jiageda Formation is mainly composed of mica quartz schist��chlorite schist and quartzite�� The metamorphic mineral assemblage is quartz + amphibole + biotite + plagioclase�� The metamorphic grade is equivalent to greenschist facies�� The LA-ICP- MS U-Pb dating for zircon and geochemical analyses of the samples indicates that it should be formed in late Late Ordovician�� The protolith is a set of inter- mediate- felsic volcanic rocks�� Jiageda Formation underwent two- phases deformations: the first phase of the stress field direction of NW��SE trending extrusion��forming ne structure in the direction of distribution line; the second phase of stress field direction of NS trending extrusion��forming EW structure in the direction of distribution line�� which might occur after Early Carboniferous��