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Based on the experiments on dehydration-melting of solid samples of Al-rich gneiss (H029) and biotite granulitite (H013), the fugacities of O 2, H 2O and H 2 have been calculated. It is recognized that the fugacities of O 2, H 2O and H 2 vary regularly, but the fugacity of H 2O shows a tendency of abrupt increasing at about 700℃ and 800℃. According to the above fact, the melting mechanism of biotite can be well documented. Under relatively low temperatures (<750℃), part of the water can be liberated and induce plagioclase to melt, which may mark the beginning of migmatization. At high temperatures (>800℃), biotite can be dissociated and a larger amount of water can be released, which would result in a bigger degree of melting, hence leading to the formation of granitic magma.
Based on the experiments on dehydration-melting of solid samples of Al-rich gneiss (H029) and biotite granulite (H013), the fugacities of O 2, H 2O and H 2 have been calculated. It is recognized that the fugacities of O 2 , H 2O and H 2 vary regularly, but the fugacity of H 2O shows a tendency of abrupt increasing at about 700 ° C. and 800 ° C. According to the above fact, the melting mechanism of biotite can be well documented. <750 ° C), part of the water can be liberated and induce plagioclase to melt, which may mark the beginning of migmatization. At high temperatures (> 800 ° C), biotite can be dissociated and a larger amount of water can be released, which would result in a bigger degree of melting, hence leading to the formation of granitic magma.