加拿大大不列颠哥伦比亚省杰艾尔金多金属矿床成因类型及控矿因素分析

杰艾尔金多金属矿位于加拿大大不列颠哥伦比亚省重要的热水沉积型（SEDEX）和火山块状硫化物型（VMS）Pb-Zn多金属成矿带。经多期勘探，目前控制黄金资源已达到大型，铅、锌及银分别达中型规模。但对其矿床成因类型一直存在争议，控矿因素研究也不够深入，导致进一步的找矿方向不明确。在2010年实施的一期大规模勘探中，通过对钻孔岩芯及坑道的仔细观察，结合大量样品的多元素分析结果和矿体三维模型，确定了杰艾尔金多金属矿床的矿化期次和成因类型。在矿区新一轮的勘探中，获得较好的找矿效果。矿区已圈定的2个矿带（黄蜂矿带、主矿带），南北相距仅30 m，却表现出完全不同的矿化类型。本次研究认为：黄蜂矿带为受碳酸盐岩控制的层控“爱尔兰”型铅锌矿；主矿带为造山期叠加在层控型Pb-Zn矿化基础上受剪切带控制的“造山型”Au-Ag-Pb-Zn多金属矿化。

Analysis on Genetic Type and Ore-controlling Factor of J&L Gold Polymetallic Deposit in B C.Province, Canada

J&L Au Polymetallic deposit situates at an important regional SEDEX and VMS type Pb-Zn polymetallic metallogenic belt.After several stage of exploration,it’s gold resources already reached a large sized level,Pb-Zn and Ag all reached a medium sized level.But according to the genetic type has been controversial for a long time,and the research about the ore control factors is not enough,exploration direction is undefined.In a big exploration campaign of J&L in 2010,the different mineralization episodes was indentified and the mineralization genetic type was defined through detailed observation on drilling cores and underground,combining with a numerous of sample results from muti-elements analysis and 3D modeling for J&L.Based on a clear understanding about J&L,a new exploration campaign was arranged,subsequently lead to a very good exploration result.Two mineralization zones(Yellow jacket and Main zone) had been identified and controlled,the space between two zones from north to south is only 30 m,but the two zones show a distinct different mineralization type.This research consider:Yellow jacket zone is a stratabound IRISH Pb-Zn deposit hosted by carbonate;Main zone is a orogenic Au-Ag-Pb-Zn polymetallic deposit hosted by shear zone,which overprinted on a stratabound Pb-Zn mineralization in orogenic period.