浙江省龙泉县八都萤石矿床化探方法试验研究

为了发挥勘查地球化学在找矿中的优势,运用类似于研究脉状热液型金属矿床地球化学特征的方法,对浙江省龙泉县八都萤石矿床进行了地球化学找矿方法的试验研究,目的是:(1),了解该类型萤石矿床在成矿作用影响下,赋存于围岩、水系沉积物及水介质中的地球化学特征;(2),了解该类型矿床的原生、次生异常特征.以期在未知区对该类矿床的找矿评价工作时提供一些地球化学方面的依据.通过研究表明:形成萤石矿床原生晕元素有:第一组F、As、Sb、Ca、Ag、Mo、Y;第二组Na、Mg、Al、K、Ti、Ba、P、Nb、Pb等.其中第一组为正异常元素(简称正晕元素);第二组为负异常元素(简称负晕元素).所有以上元素的原生晕都呈现带状特征.正晕元素的轴向分带由上到下为:F-Ca-As-Sb-Y-Ag-Mo.水系沉积物及重砂测量结果表明:在已剥蚀的萤石矿床附近的水系中,可以形成萤石重砂异常及F元素异常.萤石可做为找矿的指示矿物;F可做为找矿的指示元素.矿区水文地球化学研究结果表明:在已知萤石矿田范围内,可出现F^-、Ca³⁺的水化学异常,该异常对于矿体富集部位及矿带的延伸方向有一定的指示意义.

THE TRIAL UTILIZATION OF GEOCHEMICAL PROSPECTINGMETHOD IN THE BADU FLUORITE DEPOSlT,LONGQUANCOUNTY, ZHEJIANG PROVINCE

In order to make full use of the advantages of exploration geochemistryin ore prospecting, we have used the method similar to that in the study ofgeochemical characteristics of veinlike hydrothermal metallic deposits to performtrial geochemical prospecting in the Badu fluorite deposit of Longquan coun-ty, Zhejiang province. The purpose for this study is (1) to get to know geo-chemical characteristics of wall rocks. stream sediments and water madiahosting this type of fluorite deposits in the process of mineralization, and (2)to find out features of primary and secondary anomalies in this type of oredeposits. The data obtained are expected to provide some geochemical groundsfor the prospecting and evaluation of this type of ore deposits in unknownareas. Studies show that primary anomalous elements associated with the formation of fluorite deposits include F, As, Sb, Ca, Ag, Mo, Y in Group I and Na, Mg, Al, K, Ti, Ba, P, Nb, Pb in Group II with elements in Group I being positive anomalous ones and those in Group II being negative anomalous ones. Primary anomalous of all these elements exhibit'tonal arrangement. Axial zoning of the positive anomalous elements are in upward succession F- Ca-As- Sb-Y-Ag-Mo. Stream sediment and heavy sand survey indicates that placer fluorite anomalies and F anomalies might have formed in drainage system near the denuded fluorite deposit, SO that fluorite may serve as an indication mineral and F as an indicator element in ore prospecting. Hydrogeochemical studies suggest that F^- and Ca⁺⁺ hydrochemical anomalies may appear within the fluorite orefield, which are of some significance in indicating enrichment locality of orebody and extension of ore zone.