江南造山带中段糜棱岩的流变学和年代学研究

Four structural cross sections passing the mylonite zone had been mainly collected by both Chinese and French geologists in Jiangnan orogenic belt, and sampling, determining and dating to rock specimens had been also systematically completed. Moreover, a contrast between the flow deformation from mylonites of different depth level and the dating from different structural units as the same period opens up the crust-mantle rheology, tectonic chronology and orogenetic comparison. Chief results and data are shown below: ①A break through progress was gained from the high tempreture-high press experiment to the mylonite, and rheological parameters of the compound artificial mylonite through the TEM determining and calculating are: dislocation density 3.20×109cm-2; rheological stress 139.32MPa；speed rate of strain 6.39×10-10S-1。These parameters are the same grade with the natural mylonite. ②Twenty two specimens of the 40Ar-39Ar dating were determined in the Montpeller University, and the structural event ages of the forming mylonite in the Jiangnan Orogenetic belt can be distinguished in 122.9±2.4-126.6±1.2Ma and 102.1±1.0-110.8±1.1Ma. ③Three stages of the collision orogeny of the compression-strike slip-extension can be judged in light of synthetic analysis to the metamorphic rock and mylonite dating with the U-Pb and Ar-Ar methods, and the ages are 760-805Ma；229.0±2.9-225.6±2.9Ma；131±1.7Ma。

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