金矿化地质地球化学特征

作者发现金矿（化）点２０余处，包括４个类型：（１）受花岗岩中相关剪切带控制的黄铁绢英岩金矿；（２）多金属硫化物石英型脉型金银矿；（３）陆相含炭岩系沉积改造层控金矿；（４）陆相砾岩金矿。（１）、（３）两种类型金矿具工业规模。黄铁绢英岩金矿主要赋存在以胶东群为交代基体的重熔花岗岩或交代花岗岩的构造蚀变带中心。这类构造蚀变带是遭受长期构造应力作用并叠加后期构造破裂经热液蚀变形成的。成矿热液为中温碱性溶液，金多呈金氯络合物形式被活化搬运。该类型金矿与强绢英岩化蚀变关系密切，在韧性剪切带基础上发育的蚀变糜棱岩化花岗岩带上等间距成群出现。陆相含炭岩系沉积改造层控金矿，为缓倾斜层状、似层状、透镜状矿体，受下白垩统莱阳群一段上、下含炭岩系控制。金矿在上、下含炭岩系中多层出现。此类矿床为晚元古代胶北地体隆起为陆，风化剥蚀产物沉积在中生代断陷盆地陆相湖泊基底堆积物中，由于盆地底部丰富的有机质及粘土对古风化产物中分解的自然金的富集作用形成了富金矿源层，ＡＵ：１４－８００ｐｐｂ。在燕山晚期强烈构造变动影响下，成矿热液活动，有机炭在矿床改造过程中进一步富金作用，形成工业矿床。这是一新类型金矿。

GEOLOGY-GEOCHEMISTRY CHARACTER OF GOLD MINERALIZATION

The writers have discovered more than 20 places of gold mineral (mineralization ) occurrencel including four types:(1) Pyritic phyllic alteration gold deposits controlled by shear zone in granite(2)Polymetallic sulphide depositS of glod-Silver quartz vein ; (3) Continental sedimento-transform stratabound gold deposit in carbonaceous rock; (4) continental gold deposits of conglomerate. Among them, types (1 )and(3) gold depositS are of industrial scale.Pyritic phyllic alteration gold deposits are mainly located in the center of structure altered zone of anatexiS granite or metasomatism granite. The structure altered zone is fomed by a long-term action of structure stress adding hydrothermal solution alteration owing to late structure rupture. Ore-forming hydrothermal solution is the middle-higher base solution, gold is often moved in the form of gold--chlorine complex compound.This type of gold deposits is related closely with strong greisenization. On the baSe of ductile shear zone, these gold deposits appear in groups or belts with equal separation in mylonilization granite belts.The sedimemto-transform stratabound type of gold deposits in continental carbonaceous elastic rock is slightly gentle tilted stratiform,parastratiform, lens bodies, controlled by NO. I member carbonaceous rock of Lai Yang group in the lower series of K' They appear in the form of multi-stratiforms. These gold deposits are the weathering productS upwarping into continent in Jiao Be massif of late Proterozoic Era deposit in continental factes basement sediments in fault block basin of Mesozoic Era. The abundant organic matter and clay in the bottom of basin enrich the mative gold decomposed from ancient weathering products. So, abundant gold source bed has been formed.In carbonaceous rock, An 14-800ppb. In the effect of intense tectonic movement in late Yan Shan age, due to movement of ore-forming hydrothermal solution, organic carbon further deposits gold in the process of ore deposits reformation, which form a number of industrial deposits. They are new type of gold depoSits.