广西大厂锡矿泥盆纪中基性火山岩的地质特征  

Geological characteristics of Devonian neutral and basic volcanic of Dachang tin deposit in Guangxi

作　　者：刘陈明[1] 秦德先[1] 刘团峰 余阳先[1] 姚根华[1] 郑晓军 

机构地区：[1]昆明理工大学矿产地质研究所,昆明650093 [2]陕西省地质矿产勘查开发局区域地质研究院,陕西咸阳710054 [3]西南有色昆明勘测设计(院)股份有限公司,昆明650051

出　　处：《矿产与地质》2011年第1期34-40,共7页Mineral Resources and Geology

摘　　要：近年在广西大厂锡矿泥盆纪地层中发现的中基性火山岩,主要为玄武岩、安山岩类岩石,属钙碱性-碱性系列,形成于大陆裂谷环境。火山岩表现为轻稀土富集型的,轻、重稀土比值高,Eu、Ce表现为中度亏损,重稀土元素分馏程度较高。通过对火山岩的稀土元素做Q性聚类分析得出,矿石和层状火山岩之间关系更为密切,矿石对于层状火山岩有继承性和一致性关系,成矿物质来源可能与火山作用有关。矿床应为火山-喷流热水沉积-后期叠加改造成因。The neutral and basic volcanic recently discovered in Devonian stratum of Dachang tin deposit of Guangxi mainly comprise the basalt and andesite series,belong to calcium alkaline-alkaline series,and formed in the continental rift environment.The volcanic has the characteristics of rich light rare earths,high ratio of light to heavy rare earths,moderate losses of Eu and Ce,and high fractionation of heavy rare-earth element.According to the Q-cluster analysis of rare-earth element of the volcanic sample,the relationship between the ore and the layered volcanic is close,demonstrating the inheritance and consistency to the layered volcanic,which indicates that the sources of ore-forming materials might be related to volcanism.The deposit shall be formed by means of volcano-hydrothermal exhalative sedimentation-late stage superposed and deformation.

关 键 词：锡矿床 中基性火山岩 Q型聚类分析 地球化学 裂谷 大厂 广西 

分 类 号：P5[天文地球—地质学]