内蒙古敖汉旗岱王山金矿田地质特征和资源潜力预测

岱王山金矿田是著名的赤峰-朝阳金矿化集中区内新近发现并勘查的一个重要金矿田,包括岱王山金矿及其东西两侧的峰水山金矿和中井金矿。它们并不是常见的产在老变质岩或岩浆岩中的高品位石英脉型金矿化,而是产在石炭纪砂板岩内的层控-层状的低品位蚀变岩型金矿化,是赤峰-朝阳金矿化集中区内一种新的金矿化类型。矿田内共划分出四条北东向矿化蚀变破碎带,圈定了82条金矿体。矿体多呈似层状、透镜状产在层间构造中,赋矿围岩主要为石炭纪轻微变质的砂板岩,金属矿物主要为黄铁矿和自然金。由于工作程度低,对矿床成因还无法做出较深的讨论。本文把矿田内的金矿成矿期次划分为3期:沉积期、热液成矿期和表生期。对该矿田内矿床地质勘查资料的综合研究表明,岱王山、峰水山和中井矿区的深部、矿区间连接部位以及岱王山矿区北侧和中井金矿西侧均有较好的找矿潜力。本文的结果将为今后同类金矿的找矿勘查提供重要参考。

Geological features and resource potential prediction of the Daiwangshan gold ore field in Aohan Banner, Inner Mongolia

The Daiwangshan area is an important gold ore field in the Chifeng-Chaoyang gold-deposit concentration region, including the Daiwangshan gold deposit, as well as the Fengshuishan gold deposit and Zhongjing gold deposit which are located on the east and west side of the Daiwangshan gold deposit, respectively. It is of a new type, a low-graded, stratabound-stratiform, altered rock type gold mineralization in Carboniferous sedimentary rocks, rather than the common gold quartz-vein type in Pre-Cambrian metamorphic rocks like those in the Chifeng-Chaoyang gold concentration region. In this ore field, there are four northeast-trending mineralized and fractured alteration zones, and 82 gold orebodies have been determined. The ore bodies are mostly layered and lens shaped in interlayer structures, with host rock of sandstone dominant. Pyrite and natural gold are the main metallic mineral in the gold ore. The metallogenic period of the gold ore field can be divided into 3 periods: sedimention, hydrothermal mineralization and hypergene periods. Geological exploration data show that the deep subsurface and the connecting locations of the three gold deposits, as well as the north side of the Daiwangshan gold deposit and the west side of Zhongjing gold deposit have good potentials of gold resources.