Search

The Yunmeng Shan metamorphic core complex (MCC) is composed of the lower plate, the upper plate and the detachment zone. The detachment zone consists of ductile shear zone (mylonite zone), chloritized microbreccias zone and the brittle fault plane. The ductile shear zone contains mylonitic rocks, protomylonites, and mylonites. Finite strain measurements of feldspar porphyroclasts from those rocks using the R f/φ method show that the strain intensities increase from mylonitic rocks ( Es=0.66-0.72) to protomylonites ( Es=0.66-0.83), and to mylonites ( Es=0.71-1.2). The strain type is close to flatten strain. Kinematic vorticity estimated by Polar Mohr diagrams suggest that foliations and lineation of mylonite (0.47< W k<0.85) record a bulk simple-dominated general shearing at the initial evolution stage of the Yunmeng Shan MCC's detachment zone; and the extensional crenulation cleavage(ecc) (0.34