贵州省望谟县纳郎金矿地质特征与找矿标志研究

Geological Features and Ore Criteria for the Nalang Au Deposit in Wangmo,Guizhou

矿区所处的大地构造位置位于扬子地台-黔南台陷-望谟NW向构造变形区的右江褶皱带内,区内以褶皱、断裂构造为主,导致层间滑脱,挤压破碎,为成矿提供了构造控制条件。二叠系上统领薅组第二段,薄-中层状粉砂岩,含砾质粉砂岩夹中厚层岩屑粉砂、细砂岩夹少量薄层钙质粘土岩及硅质岩,局部岩层受构造影响硅化蚀变强烈,是矿区主要含矿层位,矿体围岩主要为薄至中层状粉砂岩,共有6个金矿(化)体,矿体形态呈似层状产出。矿床成因类型为地下(卤)水溶滤金矿床,为砷-锑-汞-金建造,层位标志、蚀变标志等找矿标志明显,研究结果对以后的地质勘查具有很重要的参考。

The Nalang Au deposit in Wangmo,Guizhou lies in the Youjiang fold zone of the Yangtze platform.Folds,faults,interlayer slippage,crush and fracture are developed in the studied area.The main host horizons are thin-medium bedded siltstone,gravelly siltstone interbedded with thick lithic siltstone,fine sandstone with a few thin layers of calcareous clay and silicalite of the Second Member of the Upper Permian Linghao Formation.The main host rock is thin-medium bedded siltstone.6 Au ore bodies occur as stratoid form.The deposit was formed from gold leached by underground brine,belonging to As-Sb-Hg-Au formation.Host horizon,wallrock alteration may be as ore criteria.