Evidence and dynamics for the change of strike-slip direction of the Changle–Nanao ductile shear zone, southeastern China |
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| Authors: | Wang Zhihong Lu Huafu |
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| Institution: | aInstitute of Geology, Chinese Academy of Sciences, Beijing 100029, China;bDepartment of Earth Sciences, Nanjing University, Nanjing 210008, China |
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| Abstract: | The Changle–Nanao ductile shear zone was developed from a suture zone. The evidence from the ductile fabrics and mylonitic microstructures indicates that the strike-slip was sinistral during pre-collision. It became dominantly dextral in the syn-collision stage in late Early Cretaceous. The dextral strike-slip movement continued in the post-collision stage with extension as the dominant process. The strike-slip movement of the zone was strictly controlled by dynamics of collision between the Fujian (Min)–Taiwan (Tai) microcontinent and the Fujian (Min)–Zhejiang (Zhe) Mesozoic volcanic arc during the time interval of 100–120 Ma. The Min–Tai microcontinent in which the ductile shear zone developed might have been located originally to the south of its present position. The northward migration of the microcontinent had contributed to a few hundred kilometers of drift rather than a shear displacement. The real shear displacement is small due to the change of strike-slip direction from sinistral to dextral. |
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