在尚未取得稳定同位素和微量元素资料的情况下,笔者着重野外观察、室内鉴定,结合岩石化学和同位素地质年龄等所提供的信息,探讨了桃坪花岗岩的物质来源、构造类型和成岩方式;揭示了桃坪花岗岩与围岩变彬、变质作用的成因联系;并提出桃坪花岗岩在成因上属于S型、同构造、晚运动、半原地花岗岩。 In the absence of stable isotope and trace element data, the author focused on the field observation, indoor identification, combined with petrochemical and isotopic geologic age provided the information to explore the material source, structure type and diagenesis of Taoping granite; reveal The relationship between the Taoping granite and the surrounding rocks is changed and the metamorphism is related. It is also suggested that the Taoping granite belongs to the S-type, synsedimentary, late-movement and semi-situ granite.