40Ar-39Ar ages of the Louzidian-Dachengzi ductile shear zone near Chifeng, Inner Mongolia and their tectonic significance |
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Authors: | Xiaohui Zhang Tiesheng Li Zhiping Pu Hui Wang |
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Institution: | (1) Research Center for Mineral Resources Exploration, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100101 Beijing, China;(2) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China |
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Abstract: | The Louzidian normal fault occurs as the eastern detachment fault of the Kalaqin metamorphic core complex. Field observations
and microstructural analyses reveal that the Louzidian-Dachengzi ductile shear zone developed in its lower-plate was genetically
related to sinistral strike-slips and extensional faulting. Two samples from this ductile shear zone yield 40Ar-39Ar plateau ages of 133 Ma (Bi) and 126 Ma (Kp), which are concordant with their isochron ages. The plateau age of 133 Ma (Bi)
records the formation age of the ductile shear zone. The inconsistent relationship between the earlier strike-slip ductile
shear zone and the later normal fault makes the Kalaqin Quasi-metamorphic core complex distinctive from Cordilleran metamorphic
core complex. These ages provide important geochronological data for putting constraints on the formation age and genesis
of such ductile shear zones. |
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Keywords: | 40Ar-39Ar age Sinistral strike-slip Louzidian-Dachengzi ductile shear zone Metamorphic core complex |
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