通过对紫云山花岗岩中的黑云母进行详细的岩相学观察和矿物化学成分分析,讨论黑云母的形成环境以及其成岩成矿的意义,电子探针分析发现紫云山花岗岩中黑云母富铁贫铝高钛低镁,属于典型的铁质黑云母。其FeOTot为20.34%~21.81%,w(Al2O3)为17.11%~17.67%,w(TiO2)为3.26%~3.91%,w(MgO)为6.33%~7.26%,FeO/(FeO+MgO)为0.74~0.76,指示紫云山花岗岩属于壳源的S型花岗岩。黑云母成分还指示紫云山花岗岩形成于相对较高的温度和氧逸度环境,黑云母结晶温度为760℃~780℃,logfO2为-135 MPa~-125 MPa,压力为253 MPa~322 MPa,对应侵入深度为9.56km~12.18km。此外,黑云母具有富F的特征,F质量分数为0.47%~1.73%,为铀、钨矿床的形成提供了有利条件。 Through the detailed petrographic observation and mineral chemical composition analysis of biotite in Ziyunshan granite, the formation environment of biotite and the significance of its diagenesis and mineralization are discussed. Electron probe analysis shows that biotite rich in Ziyunshan granite Iron poor aluminum high titanium low magnesium, is a typical iron biotite. The FeOTot is 20.34% ~ 21.81%, the content of w (Al2O3) is 17.11% ~ 17.67%, the content of w (TiO2) is 3.26% ~ 3.91%, the content of w (MgO) is 6.33% ~ 7.26% 0.74 ~ 0.76, indicating that the Ziyunshan granite belongs to S-type granite sourced from the crust. The biotite composition also indicates that the Ziyunshan granite was formed at relatively high temperature and oxygen fugacity. The biotite crystallization temperature is 760 ℃ ~ 780 ℃, logfO2 is -135 MPa ~ -125 MPa and pressure is 253 MPa ~ 322 MPa , Corresponding to the invasion depth of 9.56km ~ 12.18km. In addition, biotite is rich in F, with F mass fraction of 0.47% -1.73%, which provides favorable conditions for the formation of uranium and tungsten deposits.