新疆卡拉麦里金矿带金矿床容矿岩系的沉积环境

Sedimentary setting of host rocks in gold deposits of Kalamaili gold belt,Xinjiang

卡拉麦里金矿带中金矿床赋存于蛇绿岩或火山碎屑-沉积建造中,矿化类型以石英脉型为主。通过研究粉砂岩等容矿岩石的地球化学特征,判定了其沉积环境为大陆岛弧环境;蛇绿岩建造中火山岩赋存于火山碎屑-沉积建造中,容矿岩系的沉积环境也从围岩的角度证实了这些火山岩形成于岛弧环境,也论证了它们可能与该环境下的洋脊俯冲活动有关;与蛇绿岩建造中火山岩具成因联系的含金石英脉,可能为岛弧环境下与洋脊俯冲相关热液活动的反映。

The gold deposits are hosted in ophiolite or volcanic-sedimentary formations in the Kalamaili gold belt. Its main mineralization is quartz-vein type. By studying the geochemical characteristics of host rocks such as siltstone, it is concluded that the sedimentary setting of volcanic-sedimentary is continental island arc. The volcanic rocks of ophiolite formation are hosted in volcanic-sedimentary formations, the sedimentary setting of host rocks can reassure that these volcanic rocks were formed in continental island arc setting, and it also inferred that this volcanic magmatism may be related to ridge subduction. The gold-bearing quartz vein that shared genetic relationship with the volcanic rocks in ophiolite formations, might be the reflection of the hydrothermal activities about ridge subduction under the continental island arc setting.