Plastic mechanism of deformation of garnet |
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Authors: | Wen Su Bolin Cong Zhendong You Zengqiu Zhong and Daizhang Chen |
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Institution: | (1) Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;(2) China University of Geosciences, 430074 Wuhan, China;(3) China University of Geosciences, 100083 Beijing, China |
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Abstract: | The strongly deformed eclogites are well developed in ultra-high pressure jadeite-quartzite zone of the Dabie Mountains, Eastern
China, and garnets had been deformed strongly. Observations by transmission electron microscopy identified not only structure
of plastic deformation occurring as free dislocation, dislocation loops and dislocation walls, but also clusters of water
molecules present in the deformed garnet. Using infrared spectroscopy, two types of hydrous components are identified as the
hydroxyl and free-water in the garnet. Based on analysis of microstructure mechanism of deformation in garnets, and experimental
data of petrology, the clusters of water molecules were considered to lead strong plastic deformation of garnet by dislocations
because of mechanical weakening. |
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Keywords: | clusters of water molecules water weakening of garnet Dabie Mountains |
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