喇嘛苏铜矿中酸性岩体岩石学特征  

Petrologic characteristics of the acid-intermediate intrusive bodies in Lamasu copper deposit

作　　者：毛政利 成功[2] 赖健清[2] MAO Zhengli;CHENG Gong;LAI Jianqing(School of Geosciences and Info- Physics, Central South University, Changsha 410083, China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education, Central South University)

机构地区：[1]百色学院管理科学与工程学院,广西百色533000 [2]中南大学有色金属成矿预测教育部重点实验室,地球科学与信息物理学院,长沙410083

出　　处：《地质找矿论丛》2019年第2期249-253,共5页Contributions to Geology and Mineral Resources Research

基　　金：国家自然科学基金项目(编号:41171342)资助

摘　　要：采用费氏台五轴定位法和DCNoble等提出的求斜长石成分和有序度方法、鉴定图表,在喇嘛苏矿区三种中酸性岩体的岩石薄片中选择比较新鲜的、自形程度较好的斜长石,测得斜长石牌号χ(An)=24~56,有序度S=0.4~0.7,说明斜长石以中长石为主,属中温型,即在结晶过程中岩浆冷却的速度较快;斜长石环带有正常环带,也有韵律环带,表明在结晶过程中总体是正常结晶环境,而期间有上下反复运动和岩浆房内压力的反复变化。Fishercher stokes five axis positioning method,plagioclase identification plot,the method for calculation of composition and order of plagioclase put forward by D.C.Noble to identify plagioclase in three kinds of acid-intermediate intrusive bodies in Lamasu copper deposit.Samples are relatively fresh with highly euhedral crystal of plagioclase in thin section.The identification is that An%of its plagioclase mostly is between 24 to 56 and degree of order S=0.4 to 0.7 that means the domination of andesine formed under condition of medium temperature,i.e.magma is cooled quickly during crystallization of the plagioclase.Normal and rhythmic girdle in the plagioclase shows that it is crystallized under normal condition with crystal ocillation during its crystallization process,the crystallographic environment generally is normal,and there has up and down movement and the pressure change in Magma chamber again and again occasionally.

关 键 词：中酸性岩体 岩石学特征 结晶环境 喇嘛苏 新疆 

分 类 号：P588.121[天文地球—岩石学]