NanoScaled Study on the Ductile Shear Zone in Wugongshan, South China
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    Abstract:

    Based on the SinoFrance cooperated regional tectonics investigation of the middle part of the Caledonian orogenic belt in South China, SEM studies on nanosized particles and dynamic thinshell or films in different kind of ductile shear zones from Neoproterozoic to Mesozoic (ductile cleavage zone, thrust fault zone, extrusion schistose zone, tensile structural zone) in Wugongshan were carried out. Nanosized particles(50~90 nm), grinded and rolled into grinding grains, were found in the ab and ac fabric planes of the high strain zone on the surface of the four types of ductile shear zones. The nanosized particles, lines and layers composed a system of nanosized lineation, foliation and fabrication, which parallels to the visual lineation and foliation. Ultra micro SC foliation and preferred nanosized stress mineral were also found. In addition, the socalled "static friction" is actually the smooth movement, which is formed by slippage pushed by slight friction of nanosized particle layers, and caused by the grinding and rolling of the nanosized particle and composed particle. We discovered that the nanosized particle layers are widely distributed in ductile shear zone, the nanosized textures is comparable to the microsized textures, and the mechanism of ductile shear movement is special. Then, we discussed the system dynamics on the time delay of the Caledonian orogenic belt in South China, since the ductile shear zones were abnormal developed in the superficial structural position of this area.

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liuhao,-,-,-.2009. NanoScaled Study on the Ductile Shear Zone in Wugongshan, South China[J]. Acta Geologica Sinica,83(5):609-606

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History
  • Received:November 28,2007
  • Revised:November 22,2008
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