云南老君山矿田岩石化学与多期次递进成矿作用分析  

Analysis on Lithogeochemistry and Progressive Mineralization of Laojunshan Ore Field in Yunnan

作　　者：阚靖 杨斌[1,2] 彭省临[1,2] 王雄军[1,2] 梁恩云[1,2] 

机构地区：[1]中南大学有色金属成矿预测教育部重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《昆明理工大学学报（自然科学版）》2014年第4期29-36,共8页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家科技支撑计划资助项目(2006BAB01B07);973计划前期研究专项课题(2007CB416608)

摘　　要：老君山矿田位于滇东南马关县和麻栗坡县境内,中寒武统田蓬组地层为本区主要出露地层,同时也是主要赋矿层位.主量元素分析显示老君山燕山期花岗岩富硅、富碱且w(K2O)>w(Na2O),铝过饱和,具有A2型后造山陆缘花岗岩的特征,与个旧及白牛厂矿田燕山期花岗岩相似.在变质岩c-n-f三角图解上,寒武系变质岩样品均落在沉积岩区.本次研究的重要发现之一是赋矿层位中的纹层状和条带状硅质岩,经分析,其稀土元素及微量元素特征与热水沉积硅质岩相似.老君山矿田的形成主要经历了3个成矿热事件,即寒武纪热水沉积、印支期区域变质作用改造和燕山期岩浆-热液叠生改造,具多期次递进成矿的特征.Laojunshan ore field is located in Maguan county and Malipo county in southeast of Yunnan province. The Tianpeng Group in the middle Cambrian is widely exposed in the region and is also the main host rock. Analysis results of the main elements show that the Laojunshan granite is rich in Si and alkali （w （K2 O ）〉w（Na2 O））,and supersaturated in Al.The granite has the feature of post-orogenic continental margin granite which is named as A2 type.The Metamorphic samples from Cambrian fell on the Sedimentary rocks region in c-n-f triangular diagram.One of the most important findings is the discovery of the laminated and stripped silicolite which has similar features of microelements and rare earth elements as those of hydrothermal sedimentary silicolite.The formation process of Laojunshan ore field is divided into three thermal events：hydrothermal sedimentary mineralization in Cambrian,regional metamorphism transforming in Indosinian and magmatic -hydrothermal telescoping -transforming mineralization in Yanshanian,which act as progressive mineralization.

关 键 词：岩石化学 热水沉积硅质岩 递进成矿 老君山矿田 滇东南 

分 类 号：P611[天文地球—矿床学] P618.51[天文地球—地质学]