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Liu Shun(Chengdu University of Technology, China) Sun Tianze(Institute of Geophysics,Academia Sinica) Zhong Dalai(Institute of Geology, Academia Sinica)  
A mafic granulite from Shanxi Province, North China has been deformed at a confining pressure of 1 GPa and temperatures of 800 ̄900℃. Optical micrographs of deformed samples show that different scales of semi brittle ductile shear zones (SBDSZ) occur with different strains. A mechanism for the forming of SBDSZ, briefly to say, is to nucleate at pre existing weakness first and then to develop from this weakness steadily, which can be expressed by slightly revised theory of fracture mechanics of rheological materials. The experimental result is of significance in discussing the formation of ductile shear zones in the continental lower crust.
【Fund】: 中国科学院地球动力学高温高压开放实验室资助 国家自然科学基金
【CateGory Index】: P589.1
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