CAJ | 학술논문

柞水银洞子银铅多金属矿床岩、矿石稀土总量变化较大,稀土分配模式总体均为右倾型,富集轻稀土,重稀土分异不明显,重晶石脉、矿石皆呈负铈异常,铈亏损这一特征反映了成矿过程中的海底热水溶液作用.该矿床硫同位素组成变化范围大,且以重硫为主,主矿体含矿溶液总硫值与泥盆纪海水基本一致,反映硫源来自半封闭还原条件的泥盆纪海水.铅同位素分析表明矿床铅来源主要为深源,与海底火山活动存在一定关系.已有的同位素年龄数据和研究分析表明该矿床形成于中泥盆世,成矿作用与热水沉积成岩作用同时发生,相关证据也证明热水沉积作用是主要的成矿方式.研究认为,该矿床属热水喷流沉积成因,银洞子银铅多金属矿床的形成可以分为海底喷气沉积成矿和改造成矿期两个成矿期,前者是本矿床最主要的成矿期,形成了热水沉积岩(重晶石岩、硅质岩等)以及细粒金属矿物,建立了成矿模式.结合区内地质勘查工作,提出了5条找矿标志,并通过资料研究分析,从矿区外围找矿和新区找矿两个方面进行找矿预测,指出了8片预测靶区.这为深化认识柞水-山阳沉积盆地内成矿机理和指导找矿指明了方向.
작수은동자은연다금속광상암、광석희토총량변화교대,희토분배모식총체균위우경형,부집경희토,중희토분이불명현,중정석맥、광석개정부시이상,시우손저일특정반영료성광과정중적해저열수용액작용.해광상류동위소조성변화범위대,차이중류위주,주광체함광용액총류치여니분기해수기본일치,반영류원래자반봉폐환원조건적니분기해수.연동위소분석표명광상연래원주요위심원,여해저화산활동존재일정관계.이유적동위소년령수거화연구분석표명해광상형성우중니분세,성광작용여열수침적성암작용동시발생,상관증거야증명열수침적작용시주요적성광방식.연구인위,해광상속열수분류침적성인,은동자은연다금속광상적형성가이분위해저분기침적성광화개조성광기량개성광기,전자시본광상최주요적성광기,형성료열수침적암(중정석암、규질암등)이급세립금속광물,건립료성광모식.결합구내지질감사공작,제출료5조조광표지,병통과자료연구분석,종광구외위조광화신구조광량개방면진행조광예측,지출료8편예측파구.저위심화인식작수-산양침적분지내성광궤리화지도조광지명료방향.
The REE content of rocks and ores range widely in Yindongzi Ag-Pb polymetallic deposit, REE distribution patterns dip to right, enrich LREE, and differentiates pooly for HREE, barite vein and ores have negative Ce anomaly, the depletion of Ce imply submarine hydrothermal process. The composition of S isotope has wide range in Yindongzi Ag-Pb polymetallic deposit, heavy S isotope predominates, δ34S value of main orebody ore-bear solution is similar with that of Devonian sea water, it indicate that sulfur derived form Devonian sea water in semi-enclosed reducing condition. Pb isotope analysis suggested that Pb mainly came from depth, related with volcanic activity in sea floor. It showed that the deposit formed in Middle Devonian era, and metallogensis happened simultaneously with hydrothermal sedimentary rock-forming process by isotopic date references and geologic study. It proved that hydrothermal sedimentary process was main ore-forming means by research. It proposed that the formation of this deposit divided into two stages, included submarine exhalation sedimentary ore-forming and reformed metallogensis stages, the former dominated and formed hydrothermal sedimentary rocks (baritic rock and silica rock, and so on) and fine metal minerals. The metallogenic model of this deposit is built, too. Combined with geological exploration work in Zha-Shan region, it summed up five prospecting criteria and took exploration prediction in surrounding ore field and new region, and delineated eight predicting targets by studying and analyzing relative references. These conclusion pointed direction for probing further mineralization mechanics and exploring in Zhashui-Shanyang sedimentary basin.