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Hydrolytic weakening of jadeite in UHP jadeite-quartzites from the Dabie Mountains, eastern China

Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

^* E-mail: suwen{at}mail.iggcas.ac.cn

Deformed jadeite grains in the UHP jadeite-quartzites from the Dabie Mountains, eastern China show evidence (by transmission electron microscopy, TEM) of plastic deformation: free dislocations, dislocation loops, dislocation networks, dislocation arrays and regularly spaced subgrain boundaries by dislocation walls. Electron energy-loss spectroscopy and TEM studies reveal the existence of water-rich bubbles within dislocations and imply a relationship with water-defect dislocation by water weakening in the jadeites. These observations suggest that the water-rich bubbles are a major weakening effect facilitating plastic deformation of jadeite by dislocation creep.

KEYWORDS: water-rich bubbles, water weakening, deformation mechanism, natural jadeite, Dabie Mountains, China, TEM, EELS