矿床地质2013，Vol.32Issue(3)：533-544,12.
石英脉型钨矿床中云英岩析离体及岩浆液态分异成矿研究——以湖南瑶岗仙钨矿床为例
Characteristics of greisen inclusions in alkali feldspar granite of Yaogangxian tungsten deposit
摘要
Abstract
The greisen inclusions usually irregularly occur near the top of the grey alkali feldspar granite in the tungsten deposits of the Nanling tungsten belt.They are mostly in irregular ellipsoid form and occur irregularly in the stage Ⅰ gray alkali feldspar granite with obviously boundary between them,and there exists no vein or fault as a channel.The outer part of the inclusion is greisenized alkali feldspar granite that contains very rich molybdenite (5％),in which the average An value of the albite is 0.64.The inner core of the inclusion is greisen with the assemblage of quartz,muscovite,fluorite,topaz,wolfamite etc.,similar to things of the quartz vein formed from hydrothermal solution.The content of the wolfamite can be more than 20 ％.Compared with granite Ⅰ,the inclusion is rich in W,Mo,Bi,Li and Rb and poor in Co,Ni,Sr and Ba,with no obvious change of Pb,Zn and Cu.Studies of geology and geochemistry of the inclusions from the Yaogangxian tungsten deposit in Hunan Province show that the greisen inclusions were formed from liquid immiscibility of the Li-F alkali feldspar granite magma,which produced magmatic-hydrothermal transition state and hydrothermal solution.The liquid immiscibility seems to have been the main mechanism for concentration or mineralization of such elements as W,Mo and Bi,but without concentration of Pb and Zn,which is different from things in the skarn-type tungsten deposit.The formation of the vein-type tungsten deposit was related to stage Ⅰ gray alkali feldspar granite.The greisen inclusions constitute an important indicator for evaluating the granite in search for ore deposits.关键词
地球化学/石英脉型/岩浆分异/不混溶/钨矿/湖南省Key words
geochemistry/ quartz vein-type/ magma separation/ liquid immiscibility/ tungsten deposit/Hunan Province分类
天文与地球科学引用本文复制引用
祝新友,王京彬,王艳丽,程细音,何鹏,傅其斌,李顺庭..石英脉型钨矿床中云英岩析离体及岩浆液态分异成矿研究——以湖南瑶岗仙钨矿床为例[J].矿床地质,2013,32(3):533-544,12.基金项目
本文得到全国危机矿山接替资源找矿项目"湘南-粤北地区锡钨多金属矿床成矿规律总结研究"(20089927)、国家科技支撑课题"湖南锡田地区深部成矿岩体空间结构与成矿预测"(2011BAB04B08)、广西"地质工程中心重点实验室建设"项目(11-031-20-K2)联合资助 （20089927）
