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Deformation characteristics and genesis of the Waziyu metamorphic core complex in western Liaoning of China

Science China Earth Sciences 2012年第8期55卷 1764-1781页

作者： ZHANG BiLong ZHU Guang CHEN Yin PIAO XueFeng JU LinXue WANG HaoQian School of Resource and Environmental Engineering Hefei University of TechnologyHefei 230009China

The Waziyu metamorphic core complex is situated at the eastern end of the Yanshan tectonic *** NNE-striking detachment ductile shear zone in the core complex lies between the Archean metamorphic basement and Fuxin-Yixian rift basin,dips NW gently,and shows corrugation *** structures,microstructures,and quartz C-axis fabrics all indicate top-to-the WNW sense of shear,i.e.,ca.285°,for the shear *** of the deformation temperatures(ca.550-250°C) demonstrate its mid-crustal origination and progressive deformation from deep to shallow *** northern segment of the shear zone shows relatively weak exhumation with exposures of low-temperature mylonites whereas its middle and southern segments have more intense uplifting with exposures of high-temperature *** and muscovite 40 Ar/39 Ar ages,U-Pb dating results of zircon from dikes and plutons as well as formation ages of the supra-detachment basin all suggest the formation time of 135-100 Ma for the core *** formation was also associated with syntectonic emplacement of the Early Cretaceous Shishan *** western margin of the core complex was truncated by the Sunjiawan-Shaohuyingzi brittle normal fault when it uplifted to shallow crust levels,and finally exhumed to near-surface *** core complex was developed by the rolling-hinge model under WNW-ESE extension during the Early Cretaceous peak destruction of the North China *** flow did not appear in the lower plate,therefore not supporting the low-crust gravitational collapse.

关键词： Waziyu metamorphic core complex detachment shear zone 40 Ar/39 Ar dating rolling-hinge model craton destruction

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