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Flow and Deformation Mechanisms of Hornblende Rocks-Example of Deformed Amphibolites from the Paleoproterozoic Fold Belt in Liaodong Peninsula

GUAN Hui-mei，LIU Jun-lai，ZHAO Sheng-jin   

  1. State Key Laboratory of Geological Processes and Mineral Resources of Ministry of Education, China University of Geosciences, Beijing 100083, China
  • Received:2008-04-01 Revised:1900-01-01 Online:2008-09-26 Published:2008-09-26
  • Contact: GUAN Hui-mei

Abstract: Microstructural studies of three types of tectonites from eastern Liaoning area with different deformation characteristics (gneissic, banded and mylonitic structures) by means of microstructural analysis, transmission electron microscope (TEM) analysis shows us they have different microstructures and submicrostructures. Through geothermometry and geobarometry, the temperature and pressure conditions of the three types of amphibolites are calculated, gneissic amphibolites: 597.0 ℃，0.536 GPa, banded amphibolites: 617.3 ℃，0.455 GPa, mylonitic amphibolites: 558.8 ℃，0.514 GPa. From the trend of variation of temperatures and pressures and in combination of microstructural analysis of three types of tectonites, it is suggested that they are formed and deformed at different stages in the same episode of deformation and metamorphism. In combination with experiments data, the dynamic and rheological structure of the lithosphere is discussed.

Key words: hornblende rocks, flow, microstructural analysis, middle-lower crust, Liaodong Peninsula

CLC Number: 

  • P545
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