滇东南地区凝灰岩型钪矿地质特征及控矿因素

GEOLOGICAL CHARACTERISTICS AND ORE-CONTROLLING FACTORS OF TUFF TYPE SCANDIUM DEPOSIT IN SOUTHEAST YUNNAN

滇东南地区师宗-弥勒构造带西南段火山岩以玄武岩、杏仁状玄武岩、玄武安山岩为主,夹有少量橄榄岩、火山角砾岩、凝灰岩。钪矿主要产于峨眉山玄武岩组喷发旋回沉积界面紫色凝灰岩中,受层位控制明显,呈层状、似层状产出。本文初步分析该区钪矿地质特征及控矿因素,成矿类型为火山碎屑沉积型,经选冶试验初步研究,凝灰岩型钪矿具有较好的综合利用前景。

The volcanic rocks in the southwest section of the Shizong-Mile tectonic belt in southeastern Yunnan are mainly composed of basalt,almond-shaped basalt and basaltic andesite,interspersed with a small amount of peridotite,volcanic breccia,and tuff.Scandium deposits mainly occur in the purple tuff of the eruption cycle sedimentary interface of the Emeishan basalt formation,and arelayered or quasi layered,obviously controlled by the stratigraphic layers.Preliminary analysis of the geological characteristics and ore controlling factors of scandium deposits in the area shows that the mineralization type is volcanic clastic sedimentary type.Based on primary selection and metallurgical experiments,the tuff type scandium deposits show good comprehensive utilization prospects.