U-Pb Dating of Anatectic Migmatites in the Yunkai Block, Gaozhou, Western Guangdong  

作　　者：王江海 涂湘林 孙大中 

出　　处：《Chinese Journal Of Geochemistry》2001年第1期20-27,共8页中国地球化学学报

基　　金：ThisworkwasfinanciallysupportedbytheGuangdongNaturalScienceFoundation (GNSFGrantNos .95 0 6 80and 930 899) .

摘　　要：The regional migmatites in the Yunkai Block were formed under low\|pressure metamorphism. The majority of their protolith are biotite\|rich peraluminous gneisses. Detailed field observations, and studies of petrology, spatial distribution of minerals and geochemistry suggest that the leucosomes were derived from anatexis. The single grain zircon U\|Pb dating data indicate that a pulse of migmatization occurred at 394～449 Ma and may have resulted from the large\|scale Caledonian magmatism in the Yunkai Block.The regional migmatites in the Yunkai Block were formed under low\|pressure metamorphism. The majority of their protolith are biotite\|rich peraluminous gneisses. Detailed field observations, and studies of petrology, spatial distribution of minerals and geochemistry suggest that the leucosomes were derived from anatexis. The single grain zircon U\|Pb dating data indicate that a pulse of migmatization occurred at 394～449 Ma and may have resulted from the large\|scale Caledonian magmatism in the Yunkai Block.

关 键 词：火成岩 变质岩 锆石U-PB年龄 广东 岩石学 混合岩 低压变质作用 

分 类 号：P595[天文地球—地球化学]