湖南香花岭花岗岩含锂云母类演化及其找矿意义  

THEEVOLUTIONOFLi-BEARING MICASFROMXIANGHUALING GRANITES AND THEIR ORE-PROSPECTINGSIGNIFICANCE IN HUNAN

作　　者：邱瑞照[1] 周肃[1] 常海亮[1] 杜绍华[1] 彭松柏[1] 

机构地区：[1]中国地质科学院宜昌地质矿产研究所

出　　处：《桂林工学院学报》1998年第2期145-153,共9页Journal of Guilin University of Technology

基　　金：地质矿产部地质行业科学技术发展基金

摘　　要：对香花岭花岗岩已有云母资料进行误差修正计算的基础上，进行了云母分子式计算和成分分类，该区含锂云母类演化系列以尖峰岭岩体为代表，由黑云母→黑鳞云母→铁锂云母→铝质铁锂云母→锂白云母；由云母演化反映出癞子岭岩体岩浆演化程度低于尖峰岭岩体，而癞子岭岩体中Ｆｅ，Ｈ２Ｏ＋等流体组份（超临界流体）含量总体低于尖峰岭岩体是导致岩浆演化和云母演化乃至矿化差异的重要因素。云母特征值Ａ＜０５，０５～０６８，＞０６８值域，可分别判定无矿、Ｎｂ矿化和Ｔａ矿化，并得到栗木含矿花岗岩和无矿花岗岩中云母资料的验证，表明依据云母特征参数可评价岩体含矿性。Based on the calculation of correcting error of micas data,which has gotten in Xianghualing granites,to calculate their formulae and to classify micas type,to set up an evolutionary series of Li-bearing micas in Xianghualing granites,which was biotite→pratolithionite→zinnwaldite→Al-zinnwaldite→lepidolite.It was the present of Jianfenling granites;The evolutionary series of Li-bearing micas in Xianhualing granites indicated that Laiziling granite was lower on magmatic evolutionary degree than Jianfenling granite′s,This is the main reason for two rock bodies,which were very similar on many aspects,to have difference characteristic on mineralization.Totally,the contents of F,H2O+et al.fluid component in Laiziling granite was lower than Jianfenling granite.It was an important factor for them to make difference on magmatic evolutionary degree,mica evolution even mineralization,Meanwhile,studying the relationship between fluid and Li-bearing mica evolution and mineralization,indicated that micas characteristic parameter A value(<05,05～068, >068)could be used to judge respectively non-,Nb and Ta mineralization,which has proved by non-and ore-bearing granites in Limu area,and suggested it was possible to judge the non-and ore-bearing granites based on mica′s parameter A.

关 键 词：花岗岩 含锂 云母类演化系列 找矿评价 

分 类 号：P588.121[天文地球—岩石学]