Due to the fact that apatite is a common accessory mineral in magmatic rocks,its geochemical composition is often used to indicate the petrogenesis of granites and provide constraints on their magmatic prop-erties.Mesozoic A-type granites are widely distributed in the eastern Jiangnan Orogen.At present,the origin of these A-type granites is still controversial,and their mineralization potential is not clear.Therefore,this study in-vestigates the geochemical composition of apatite in the Yaocun granite,constrains the magmatic properties,and evaluates its metallogenic potential.The results show that the apatite in Yaocun granite generally exhibits oscilla-tory zoning or homogeneous texture,and has high F,REE,Y,and Th,and low Cl contents,indicating its magmat-ic origins.In addition,the REE,Y,and Th contents of a single apatite grain show continuous changes from the core to the rim,and the REE pattern displays obvious negative Eu anomalies,which can be attributed to fractional crystallization.Quantitative calculations show that Yaocun granitic magma is characterized by high F,low H2O-Cl,and low oxygen fugacity.Considering the relation between magmatic properties and the behavior of ore-form-ing elements,our study suggests that Yaocun granite has rare metal mineralization potential.
关键词
磷灰石/花岗岩/稀有金属成矿/江南造山带东段/姚村
Key words
apatite/granite/rare metal mineralization/eastern Jiangnan Orogen/Yaocun
维普
万方数据