MINERAL ZONING OF THE ZHANGBALING BLUESCHIST BELT IN ANHUI PROVINCE

The Zhangbaling blueschist belt in central Anhui contains the jadeite and quartz assemblage.Situated on the northern margin of the Yangtze block,it is a highest pressure belt among the blueschist belts in China.On the basis of the mineral assemblages,the belt may be divided into five mineral zones:the stilpnomelane muscovite zone,piemontite muscovite zone,glaucophane crossite zone,actinote zone and muscovite zone.The authors discuss the mechanism of the uplift of the blueschist to the surface possibly due to underplating.