南太行綦村岩体中辉石的成因矿物学研究

通过对不同岩石中的辉石进行了详细的成因矿物学研究,结果表明綦村岩体不同岩性中的辉石可以分为两类:一类是岩浆系统中早期结晶形成的晶体,被后期的岩浆携带至地壳浅部,另一类是岩浆定位以后结晶的自生晶。在辉石的分类中大部分辉石属于透辉石,有少量是普通辉石。尽管在不同岩性中辉石的成分存在一定差异,但是所有辉石成分都指示綦村岩体的母岩浆属于亚碱性系列,其在演化过程中经历了辉石和角闪石的结晶分离过程,这一过程导致岩浆中的镁元素在早期形成的辉石和角闪石中富集,铁元素在残余熔体中富集,并在岩浆定位后随流体出熔成矿。

GeneticMineralogy of Pyroxene in Qicun Rock Mass of South Taihang

The detailed genetic mineralogical studies of pyroxene in different rocks show that pyroxene in different lithologies of Qicun intrusion can be divided into two types,one is the crystals formed in the early stage of magmatic system,which are carried to the shallow part of the crust by later magma,and the other is the authigenic crystallization of crystallization after magmatic positioning.In the classification of pyroxene,most pyroxenes belong to diopside,and a few are ordinary pyroxene.Although there are some differences in pyroxene compositions among different lithologies,all pyroxene compositions indicate that the parent magma of Qicun rock mass belongs to subalkaline series and undergoes the crystallization and separation of pyroxene and amphibole during its evolution.This process results in the enrichment of magnesium in pyroxene and amphibole formed in the early stage,the enrichment of iron in residual melt and in magma.After positioning,the ore is melted out with fluid.