摘要
南秦岭竹溪地区广泛出露的粗面质火山岩主要赋存于志留系地层中,整体呈北西-南东向展布,与铌-稀土成矿关系密切。粗面质火山岩碱质含量高,岩石分异指数较高,稀土总量高;轻稀土富集,重稀土含量低,显示出轻稀土强烈富集而重稀土亏损的特征。高场强元素Nb、Ta、Zr、Hf等强烈富集,而P和Ti表现出强烈亏损。粗面质火山岩来源于幔源玄武质岩浆的演化。根据水系沉积物特征,认为本区铌-稀土矿找矿前景较好。
Trachytic volcanic rocks that are widely exposed in the Zhuxi area of the South Qinling Mountains are mainly present in the Silurian strata.They are distributed in the northwest-southeast direction and are closely related to the niobium-rare earth mineralization.Trachytic volcanic rocks have high alkali content,high rock differentiation index,and high total rare earth content;light rare earth enrichment and low heavy rare earth content show the characteristics of strong rare earth enrichment and heavy rare earth loss.High field strength elements Nb,Ta,Zr,Hf,etc.are strongly enriched,while P and Ti show strong losses.Trachytic volcanic rocks originated from the evolution of mantle-derived basaltic magma.According to the characteristics of water system sediments,it is considered that the prospecting of niobium-rare earth ore in this area is good.
作者
祝明明
杨勇
杨世平
刘国遂
刘华
文永华
ZHU Ming-ming;YANG Yong;YANG Shi-ping;LIU Guo-sui;LIU Hua;WEN Yong-hua(Hubei Institute Of Nuclear Industrial Geology,Xiaogan 432000,China;Hubei Geological Bureau,Wuhan 430000,China)
出处
《世界有色金属》
2019年第24期69-73,共5页
World Nonferrous Metals
关键词
南秦岭
竹溪
粗面质火山岩
地球化学
找矿前景
Southern Qinling Mountains
Zhuxi area
trachytic volcanic rocks
Geochemical characteristics
prospecting prospects
