摘要:
通过对福安矿区进行1︰2000地质调查及构造地球化学找矿工作,确定了矿区出露Ⅰ型和Ⅱ型两种成因类型石英脉,并总结了两类石英脉的矿物组成、产状、形态、规模及产出位置。微量元素参数统计显示,Ⅰ型石英脉相对富集Cu、Pb、Zn、W、Mn、Mo、Sn、Ag、Co、As、Sb、Bi、Au元素;Ⅱ型石英脉相对富集铁族元素Cr、Ni、V、Ti。聚类分析及对应分析表明,Ⅰ型石英脉与成矿关系密切,且成矿具多阶段性;Ⅱ型石英脉有后期成矿事件一定程度的叠加。稀土元素分析显示,Ⅰ型石英脉稀土元素总含量较低,分异较弱,说明其形成于深源,为岩浆热液成因;Ⅱ型石英脉稀土元素具LREE的特征反映了其浅源的成因,为构造动力压泌作用形成,来自于围岩。
Abstract:
According to 1:2000 geologica1 survey and the tectono-geochemical prospecting work in the study area,the authors summed up the mineral composition, occurrence, morphology , size and occurring location of two types of quartz veins. The statistical analysis of trace element parameters show thatⅠ- type quartz vein are rich in iron group elements such as Cu, Pb, Zn, W, Mn, Mo, Sn, Ag, Co, As, Sb, Bi, Au andⅡ-type quartz veins are rich in iron group elements such as Cr, Ni, V, Ti. Cluster analysis and correspondence analysis show thatⅠ-type quartz vein is close to the ore-forming process and a multi-stage mineralization; Ⅱ-type quartz vein have some degree of post-mineralization event superimposed. REE analysis show that lower total REE content and differen-tiation is weak inⅠ-type quartz vein, indicating that formed in the deep source of hydrothermal magmatic;Ⅱ-Type quartz vein characteristics with LREE, suggesting that which from the surrounding rock belong to tectonic bedding foliation.
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