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中国科学院地质与地球物理研究所2001学术年会

作者： YE Danian,LI Zhe & HE Wei Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029,China

The grand mean values of Si-O distances in both the left and the right sides of 33 metamorphic reaction equations have been calculated on the basis of data of single crystal structural refinement *** results showed that the grand mean value of Si-O distances tends to decrease at high temperature,whereas that tends to increase at high pressure during a metamorphic reaction.

关键词： metamorphic reaction Si-O distance grand mean value

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Mineral Phase Transformation and Water Fluid Evolution of Khondalite Series in the Border Area of Shanxi and Inner Mongolia,China

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Continental Dynamics 1999年第1期 62-69页

作者： LIU Fulai Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Typical Precambrian khondalite series is widely exposed in the border area of Shanxi and Inner Mongolia, and is composed primarily of sillimanite garnet biotite gneiss (SS), garnet pyroxene biotite gneiss (GS) and attendant migmatitic gneiss. According to the characteristics of multistage reaction texture and mineral phase transformation, the mineral assemblage of the khondalite series can be divided into three generations: ① peak stage (M 1) mineral assemblage, involving hydrous biotite, is composed of Sil+Gt+Bi+Kf±Pl+Qz in the SS and Gt+Opx+Bi+Kf+Pl+Qz in the GS, formed at T=750℃-850 ℃ and P=0.80-0.95 GPa. Water activity (a H 2O ) of this stage was about 0.25-0.37 (0.28±) in the SS and 0.38-0.53 (0.45±) in the GS; ② in the post peak retrograde near isothermal decompression stage (M 2), the khondalite series of the study region is characterized by dehydration reaction of biotite, partial melting of felsic minerals and decompression texture of garnet. Sillimanite garnet migmatitic gneiss (SMS) and garnet pyroxene migmatitic gneiss (GMS) were formed at this stage. The attendant anhydrous mineral assemblages are Sil+Gt+Crd+Kf±Pl+Qz in the SMS and Gt+Opx+Crd+Kf+Pl+Qz in the GMS, formed at T= 730 ℃ - 820 ℃ and P=0.50-0.65 GPa. However, the water activity (a H 2O ) of this stage was reduced to 0.08-0.12 ( 0.09± ) in the SMS and 0.13 -0.18 (0.15±) in the GMS, and ③ in the later cooling stage (M 3) of metamorphism, fine grained hydrous vermicular symplectite Bi+Kf replaced anhydrous garnet at T=500 ℃-560 ℃and P=0.32-0.44 GPa, indicating that the water activity (a H 2O ) of M 3 increased again. Research results suggest that the border conditions of mineral evolution and (dehydration) metamorphic reactions are not only controlled by PT conditions, but also genetically related to water activity evolution in the khondalite series of the study region.

关键词： metamorphic reaction water activity khondalite series Shanxi and Inner Mongolia

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Transformation of garnet epidote amphibolite to eclogite,western Dabie Mountains,China

Transformation of garnet epidote amphibolite to eclogite,wes...

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中国科学院地质与地球物理研究所2004学术年会

作者： J.LIU AND K.YE Institute of Geology and Geophysics,Chinese Academy of Sciences,PO Box 9825,Beijing 100029,China

Omphacite and garnet coronas around amphibole occur in amphibolites in the Hong’an area,western Dabie Mountains,*** amphibolites consist of an epidote-amphibolite facies assemblage of amphibole,garnet,albite,clinozoisite,paragonite,ilmenite and quartz,which is incompletely overprinted by an eclogite facies assemblage of garnet,omphacite and *** around amphibole can be divided into three types:an omphacite corona;a garnet-omphacite-rutile corona;and,a garnet-omphacite corona with less *** analysis for local reaction domains in combination with petrographical observations show that reactions Amp+Ab+Pg=Omp+ Czo+Qtz+HO,and Amp+Ab=Omp±Czo+Qtz+HO may lead to the development of omphacite *** garnet-omphacite-rutile corona was formed from the reaction Amp+Ab+Czo+Ilm±Qtz=Omp+Grt+Rt+*** garnet-omphacite coronas,the garnet corona grew during an early stage of epidote amphibolite facies metamorphism,whereas omphacite probably formed by the reactions forming the omphacite corona during the eclogite facies *** is estimated that these reactions occurred at 0.8-1.4 GPa and 480-610℃using the garnetclinopyroxene thermometer and omphacite barometer in the presence of albite.

关键词： amphibole eclogite facies metamorphic reaction western Dabie Mountains China

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