文峪金矿床505脉矿化特征及构造控矿规律

MINERALIZATION FEATURES AND REGULARITIES OF ORECONTROLLING BY FAULT OF VEIN No505 IN WENYU GOLD DEPOSIT

５０５脉总体走向２７０～３１０°，呈透镜体状、扁豆状以尖灭再现或尖灭侧现的形式产出．５０５脉为一典型的具多金属硫化物含金石英脉．含金矿物主要是黄铁矿，其次为方铅矿和黄铜矿．黄铁绢英岩化是金矿化的重要标志．控矿构造有４次脉动，与其对应，５０５脉分４个成矿阶段，主要是Ⅰ、Ⅱ阶段及Ⅰ、Ⅱ、Ⅲ阶段叠加的部位成矿最好．５０５脉受一近东西向脆－韧性剪切带控制．矿体主要产于断裂的８５～９０°走向段和倾角为小于４５～５０°的缓倾段．这些部位也是多次矿化叠加、矿体厚度大、矿石品位高的部位，这些地段也是工业矿体产出的地段．

enyu gold deposit in Henan Province is a large scale auriferous quartz type goldlead deoposit,of which Vein No.505 is the major mined lodeThe spatial occurence of the vein is strictly controlled by an EW stricking brittleductile shear beltThe mineralization process can be divided into 4 stages, which are:(Ⅰ)pyritequartz stage,(Ⅱ)quartzpyrite stage,(Ⅲ)quartzpolymetallic sulfide stage and (Ⅳ)quartzcarbonate stageThe thickness of ore body and grade ofore are controlled by the distribution of auriferous quartz and the superimposed development of the main mineralization stages of Ⅱand ⅢcollectivelyThe structure controlling on gold mineralization shows as follow:1)Affected by the attitude and moving way of orecontrolling fault,the auriferous quartz body mainly occures at the positions where the strike of the fault is less than 90° and the dip angle is less than 50°.2)TheⅡand Ⅲ mineralization stages mainly superimpose at the positions where the strike of the fault is 85～90° and the dip angle is 45～50°.3)The prominent zones by shape of the lying wall of the orecontrolling fault are the positions where the ore shoots locateAnd 4)controlled by the extent of the prominent zones of the lying wall of the orecontrolling fault,the ore shoots in Vein No505 incline west in space