hydrothermal metamorphism
1.Medium-rank bituminites are formed by pneumato-hydrothermal metamorphism on the basis of burial metamorphism, and it is partial.
2.those in Archean and lower-middle Proterozoic hypometamorphic crystalline basement were formed as a result of the replacement of carbonate rocks by metamorphic hydrothermal fluids generated during regional metamorphism and migmatitization;
3.A detailed study of SRO association from Zermatt-Saas reveals that this ophiolite of Western Alps has experienced ocean-floor hydration, subduction-related high-pressure overprint, greenschist facies metamorphism and late hydrothermal alteration. Finally, some discussions on shortcomings in the research work of this lithological association and potential fields for further studies are also presented.
