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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。
The authors found that there are more than 20 gold mineralization sites, including 4 types: (1) pyrite-hosted gold deposits controlled by relevant shear zones in granite; (2) polymetallic sulfide quartz vein-type gold and silver deposits; (3) continental facies sedimentary alteration stratabound gold deposit; (4) continental conglomerate gold deposit. (1), (3) two types of gold mines with industrial scale. The pyrite-quartzite gold deposit mainly exists in the tectonic alteration zone center of remelted granite or metasomatic granite with the Jiaodong group as the replacement. These structural alteration zones are formed by the hydrothermal alteration of the tectonic alteration zone after long-term tectonic stress superimposed and post-tectonic fractures. Mineralization hydrothermal solution for the temperature of alkaline solution, gold mostly gold chloride complex form is activated handling. This type of gold deposit is closely related to the alteration of strong sericite rocks and appears in large clusters at regular intervals on the altered mylonitized granite belts developed on the basis of ductile shear zones. The continental facies sedimentary alteration stratabound gold deposit is a gently inclined stratiform, stratified and lenticular orebody controlled by a section of upper and lower carboniferous rocks of the Lower Cretaceous Laiyang Group. Gold deposits in the upper and lower layers of carbonaceous rocks appear. This kind of deposit is the Proterozoic Jiaobei terrane uplifted to land. The weathering and denudation products are deposited in the sediments of continental lacustrine basement in the Mesozoic rift basin. Because of the abundant organic matter and clay at the bottom of the basin, The enrichment function formed a gold-rich source layer, AU: 14-800 ppb. Under the strong structural alteration in the late Yanshanian period, the ore-forming hydrothermal fluids are activated and the organic carbon is further enriched in the ore-forming process to form an industrial deposit. This is a new type of gold mine.