【摘要】 通过1∶25万三明市幅1∶5万区调片区总结，从混合岩化变质地层中解体出片麻岩，确定其为花岗质正片麻岩。该片麻岩体为中酸性深成岩体经受强烈变形变质作用改造的产物，命名为大源片麻岩，并获得颗粒锆石U-Pb测年中207Pb／206Pb表面年龄为1 010 Ma，时代属晋宁期，为闽西北地区变质岩研究提供了新的资料。更多还原

【Abstract】  Through a summary of the 1∶50000 regional survey of the 1∶250000 Sanming City Sheet， gneiss disintegrated from migmatized metamorphic strata is determined to be granitic orthogneiss.This gneiss body is the product of strong deformation and metamorphism of an intermediate－acid pluton and named the Dayuan gneiss.The single-grain zircon U-Pb dating gave a 207Pb／206Pb apparent age of 1010 Ma， indicating a Jinningian age.This study has provided new information for the study of metamorphic rocks in the northwestern Fujian area．更多还原