土壤地球化学测量在甘肃北山白头山铷矿找矿中的应用

Application of Soil Geochemical Survey in the Baitoushan Rubidium Deposit,Beishan Area,Gansu Province

白头山铷矿床是甘肃北山地区新近发现的典型花岗伟晶岩脉型铷稀有金属矿床,以该矿床为研究对象,开展了土壤地球化学测量方法技术研究。初步确定花岗伟晶岩脉型铷稀有金属矿床的岩石和土壤中的通用指示元素组合为Rb、Be、Bi、Tl、Li、K 2O;北山地区勘查铷稀有金属矿床的土壤地球化学测量的最佳采样粒级为-4~20目,最佳采样层位为残积层。试点测量结果表明,研究确定的土壤地球化学测量方法可以完整地圈定已知的铷矿化范围,迅速缩小找矿靶区,为后续异常查证等工作布署提供准确的地球化学依据,为北山地区找寻铷稀有金属矿产提供了一种新的方法技术。同时试点测量在已知矿区外围发现了新的具有找铷矿前景的靶区,有望获得新的找矿进展,为同类地区寻找铷稀有金属矿产提供了示范。

The Baitoushan rubidium deposit is a typical granite pegmatite vein type rubidium rare metal deposit recently discovered in the Beishan area,Gansu Province.Taking this deposit as the test object,this work studied methodology of the soil geochemical survey.It is preliminarily determined that the general indicator elements in rocks and soils of the granite pegmatite vein type rubidium rare metal deposit are Rb,Be,Bi,Tl,Li,and K 2O.The best sampling size of soil geochemical survey for rubidium rare metal deposits in the Beishan area is-4 to 20 mesh,and the best sampling layer is eluvium.The results of the pilot survey show that the soil geochemical survey method can completely delineate the known rubidium mineralization range,rapidly reduce the prospecting target area,provide accurate geochemical basis for the follow-up work such as anomaly verification,and provide a new method for finding rubidium rare gold minerals in the Beishan area.At the same time,a new target area with potential for rubidium exploration has been found in the periphery of the known mining area,which is expected to achieve new prospecting progress and provide a demonstration for similar areas to search for rubidium rare metal minerals.