CAJ | 학술논문

福建铁帽山钼矿床位于闽西南拗陷带,是一个与晚侏罗世中酸性侵入岩有关的斑岩型钼矿床。矿体产出于花岗杂岩体中,杂岩体由中粗粒二长花岗岩、中粗粒钾长花岗岩、花岗斑岩和少量石英闪长岩组成,钼矿体围绕着矿区中部的花岗斑岩岩株近似呈环状分布,主要赋存于蚀变的二长花岗岩中。矿体受到后期断裂构造的破坏而被截断。矿区的围岩蚀变作用强烈,并具有明显的分带特征,自下而上、由内到外可划分为钾化带、石英-伊利石化带、蒙脱石化带和高岭石化带。其中,石英-伊利石化作用与钼矿化作用的关系最为密切。土壤地球化学测量结果显示, Mo元素对数值的频率统计呈双峰式分布,异常下限为12.2×10–6,由此圈定的Mo元素异常近似呈环状分布,与矿体分布范围总体上相一致；而低温成矿元素Zn、Ag元素和高温成矿元素Sn的异常多数分布于Mo元素环状异常的外围和中心低值区。在勘查工作中,石英-伊利石化蚀变和Mo元素地球化学异常可以作为最重要的找矿标志,同时要特别注意断层对矿体的截断和破坏作用。
복건철모산목광상위우민서남요함대,시일개여만주라세중산성침입암유관적반암형목광상。광체산출우화강잡암체중,잡암체유중조립이장화강암、중조립갑장화강암、화강반암화소량석영섬장암조성,목광체위요착광구중부적화강반암암주근사정배상분포,주요부존우식변적이장화강암중。광체수도후기단렬구조적파배이피절단。광구적위암식변작용강렬,병구유명현적분대특정,자하이상、유내도외가화분위갑화대、석영-이리석화대、몽탈석화대화고령석화대。기중,석영-이리석화작용여목광화작용적관계최위밀절。토양지구화학측량결과현시, Mo원소대수치적빈솔통계정쌍봉식분포,이상하한위12.2×10–6,유차권정적Mo원소이상근사정배상분포,여광체분포범위총체상상일치；이저온성광원소Zn、Ag원소화고온성광원소Sn적이상다수분포우Mo원소배상이상적외위화중심저치구。재감사공작중,석영-이리석화식변화Mo원소지구화학이상가이작위최중요적조광표지,동시요특별주의단층대광체적절단화파배작용。
Located in the southwest Fujian geotectogene, the Tiemaoshan molybdenum deposit is a porphyry molybdenum deposit related to Late-Jurassic intrusive bodies. Ore bodies occur within granitic complex which is composed of adamellite, syenogranite, granitic porphyry and minor quartz diorite. Molybdenum ore bodies, dominantly hosted by altered adamellite, are distributed surrounding the granitic porphyry stock at the center of the ore district. Ore bodies are crosscut by the post-metallogenic faults. The intense wall rock alteration shows distinct zoning composed of potassic alteration, quartz-illitization, smectitization and kaolinitization. The quartz-illitization has the most intimate relationship with Mo mineralization. Soil geochemical survey has revealed that the lg Mo has a bimodal frequency distribution. The threshold of Mo could be defined as 12.2×10–6. The principal Mo anomaly shows ring-like distribution, which is spatially coincident with the ore bodies. However, the anomalies of low-medium temperature elements Zn and Ag as well as the high temperature Sn mostly appear outside and inside the ring-like Mo anomaly. Thus, the quartz-illitization and Mo geochemical anomaly could be considered as the most important targets for exploration. Meanwhile, the destruction and crosscutting actions of faults on ore bodies also deserve special attention.