40Ar/39Ar geochronology and exhumation of mylonitized metamorphic complex in Changle-Nanao ductile shear zone |
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| Authors: | Zhihong Wang Huafu Lu |
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| Institution: | (1) Institute of Geology, Chinese Academy of Sciences, 100029 Beijing, China;(2) Department of Earth Sciences, Nanjing University, 210008 Nanjing, China |
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| Abstract: | New40Ar/39Ar plateau ages from rocks of Changle-Nanao ductile shear zone are 107.9 Ma(Mus), 108.2 Ma(Bi), 107.1 Ma(Bi), 109.2 Ma(Hb)
and 117.9 Ma(Bi) respectively, which are concordant with their isochron ages and record the formation age of the ductile shear
zone. The similarity and apparent overlap of the cooling ages with respective closure temperatures of 5 minerals document
initial rapid uplift during 107–118 Ma following the collision between the Min-Tai microcontinent and the Min-Zhe Mesozoic
volcanic arc. The40Ar/39 Ar plateau ages, K-Ar date of K-feldspar and other geochronologic information suggest that the exhumation rate of the ductile
shear zone is about 0.18–1.12 mm/a in the range of 107–70 Ma, which is mainly influenced by tectonic extension. |
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| Keywords: | Changle-Nanao ductile shear zone 40Ar/39Ar plateau ages closure temperature uplift |
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