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the ductile shear
Jingshan superlarge gold deposit is a typical deposit closely related to the ductile shear zone, developing the economic enrichment during the transition form the ductile deformation to the brittle deformation.
      
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.
      
These kinds of shear types only produce a/ab strain facies, so the lineation in the ductile shear zone could not deflect 90° in the progressively deformation.
      
The present profile of the ductile shear zone with consistent SW-dipping mineral elongation lineation shows antiform and reversed S-shape from northeast to southwest respectively.
      
Exposure structures, microstructures and quartz C-axis fabric all indicate top-to-SW movement for the ductile shear zone.
      
Intrusion of the Hongzhen granite with a biotite plateau age of 124.8±1.2 Ma rendered the ductile shear zone curved, uplifted and final localization of the core complex.
      
When brittle structures were formed locally in the ductile shear zone, the ore-forming fluids migrated to the structures along microfractures, and preciptated auriferous quartz because of reduction of pressure and temperature.
      
At the same depth, lithospheric shear strength represents the smallest of the brittle shear strength and the ductile shear strength.
      
Compared with the ductile shear failure of GRE10-ns, the shear failure of GRC10-ns is rather catastrophic.
      
Moreover, no evidence of continuity between the ductile shear zone and the recent brittle deformation has been found on the field.
      
The ductile shear zones were brecciated and truncated by brittle faults late in their history.
      
 

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