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Unlike the magma intrusion model,the in- situ melting hypothesis advanced in the lastdecade regards the upper crustas a closed system,and granite as the resultof the materialswithin system changing from order (protolith) to disorder (melts) and to new order(granite) with the variations of entropy of the system.The various geological and geochemi-cal data from the Mesozoic granitesof southeast China are explained logically and systemical-ly by the hypothesis,concluding that they should be originated from the melting of pro-toliths.According to the hypothesis,melts generated from in- situ melting are of layer- likewithin the crustand batholithsare the protruding parts of the uppersurface of the layer (de-fined as the Melting Interface,MI for short) .On the basis the author tries to discuss thesource of heatfor the Mesozoic crustal melting in southeast China.
Unlike the magma intrusion model, the in-situ melting hypothesis advanced in the lastdecade regards the upper crustas a closed system, and granite as the result of the materialswithin system change from order (protolith) to disorder (melts) and to new order (granite) with the variations of entropy of the system. The various geological and geochemi-cal data from the Mesozoic granites of southeast China are explained logically and systemically-ly by the hypothesis, concluding that they should be originated from the melting of pro-toliths.According to to the hypothesis, melts generated from in situ melting are of layer- likewithin the crustand batholithsare the protruding parts of the uppersurface of the layer (de-fined as the Melting Interface, MI for short). On the basis the author tries to discuss thesource of heat for the Mesozoic crustal melting in southeast China.