滇西大石坡超大型红柱石矿床成因:岩浆岩侵位的约束  

Genesis of the Dashipo Super-Large Andalusite Deposit in Western Yunnan Province:Constraints of Magmatic Emplacement

作　　者：李新民 明添学 肖静宇 李蓉 李伟[4] LI Xinmin;MING Tianxue;XIAO Jingyu;LI Rong;LI Wei(Institute of Yunnan Geology Survey,Kunming,Yunnan 650216;Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization,Ministry of Natural and Resources,Kunming,Yunnan 650051;Yunnan Geological Survey,Kunming,Yunnan 650051;Kunming Institute of Geological Exploration,China Metallurgical Geology Bureau,Kunming,Yunnan 650203)

机构地区：[1]云南省地质调查院,云南昆明650216 [2]自然资源部三江成矿作用及资源勘查利用重点实验室,云南昆明650051 [3]云南省地质调查局,云南昆明650051 [4]中国冶金地质总局云南昆明地质勘查院,云南昆明650203

出　　处：《地质与勘探》2021年第4期825-836,共12页Geology and Exploration

基　　金：中国地质调查局中国矿产地质志项目(编号:DD20160346、DD20190379)资助。

摘　　要：滇西大石坡矿床是近年来新发现的超大型红柱石矿床。红柱石属于蓝晶石族矿物,是制造高级耐火材料的原料,在新兴产业、高新技术产业中也具有重要经济价值。红柱石矿物原料地质工作程度在云南省比较低,趋于空白。本文通过岩石地球化学和主要矿物相关性分析,深化认识大石坡红柱石矿床成矿特征与成因。大石坡红柱石矿体赋存在高黎贡山群红柱石石英云母片岩、含红柱石云母石英片岩、红柱石长石云母石英片岩中,矿体厚度大、品位中等,矿床规模达超大型。红柱石是受古近纪花岗岩侵位发生低压高温接触变质作用而形成,分布杂乱,无定向性,与区域片理产状斜交。研究显示,红柱石与矽线石相关系数为-0.369,说明二者之间成因不相关,红柱石与矽线石不是同一变质时期形成的。该矿床的形成明显受高黎贡山群片岩和古近纪钙碱性过铝质S型花岗岩制约。The Dashipo deposit is a newly discovered super-large andalusite deposit in western Yunnan,in which andalusite belongs to the family minerals of kyanite.It is the raw material for manufacturing high-grade refractory materials,with great economic values in emerging and high-tech industries.While little geological work had been done on this mineral,nearly a blank in Yunnan Province.In this article,the metallogenic characteristics and genesis of the andalusite deposit in Dashipo are further understood through the rock geochemistry and correlation analysis of major minerals.Research suggests that the ore bodies of the Dashipo deposit are hosted in andalusite quartz-mica schist,andalusite-bearing quartz schist and andalusite-feldspar quartz schist of the Gaoligongshan Group,which are of large thickness and medium grade,and the scale of the deposit reaches super large.Andalusite was formed by low pressure and high temperature contact metamorphism due to the Paleogene granite emplacement,which is disorganized,astatic and oblique to regional schistosity.The study shows that the correlation coefficient between andalusite and sillimanite is-0.369,indicating that the origin of them is not correlated,i.e.andalusite and sillimanite were not formed in the same metamorphic period.The genesis of the Dashipo deposit was obviously constrained by the schist of the Gaoligongshan Group and the calc-alkaline peraluminous S-type granite of Paleogene.

关 键 词：红柱石 成因 岩浆岩 大石坡 滇西 

分 类 号：P579[天文地球—矿物学]