青海卡里果玛钨钼矿区地球化学异常特征及找矿潜力分析

Geochemical anomalous characteristics and prospecting potential analysis of Kaliguoma W-Mo District,Qinghai

卡里果玛钨钼矿床位于北祁连成矿带与中祁连成矿带接触部位,成矿地质条件优越。矿区内矿体主要赋存于古元古界托赖岩群黑云母二长片麻岩与二云母二长花岗岩外接触带的矿化蚀变带中,形成了热液型白钨矿石、辉钼矿石,以及石英脉型、萤石脉型白钨矿石,硅化、萤石化越强,钨矿化强度越高,是重要的找矿标志。通过在卡里果玛地区1∶20万水系沉积物AS乙2^16大黑山W、Mo异常和1∶5万水系沉积物AS05综合异常内进行1∶1万土壤地球化学测量,圈出了6处土壤综合异常(AP1-AP6),各土壤综合异常强度高、面积大,各异常元素间套合好,极大值高,多数具有内中外三级异常分带,浓集中心明显。综合分析表明,卡里果玛钨钼矿区具有优越的成矿地质条件,地球化学异常发育,已发现了较好的钨钼多金属找矿信息,且获得一定的资源量,充分展示了该矿区具有较大的找矿潜力,通过进一步工作,有望取得较好的找矿成果。

The Kaliguoma W-Mo Deposit is located on the contact zone of North Qilian metallogenic belt and Middle Qilian metallogenic belt,where the ore-forming geological condition is superior.The ore bodies in this area mainly occur in the mineralized alteration zone that is the outer contact zone of the Lower Proterozoic Tuolaiyan Group biotite adamellite and dimica adamellite,where hydrothermal fluid type scheelite and molybdenite,quartz vein type and fluorite type shceelite formed.The stronger the silicification and fluoritization are,the higher the tungsten mineralization is,suggesting silicification and fluoritization are important prospecting indicators.1∶10000 soil geochemical survey is conducted in 1∶200000 stream sediment AS乙2^16 Daheishan W and Mo anomalies and 1∶50000 stream sediment AS05 comprehensive anomalies,delineating 6 soil comprehensive anomalies(AP1-AP6).Each soil comprehensive anomaly is characterized by high intensity and large area.Each anomalous element has good sets and high maximum value and most of them are characterized by inner,middle and outer three-level anomaly zonation and distinct concentration center.Comprehensive analysis shows that Kaliguoma W-Mo district has superior ore-forming conditions,and develops geochemical anomalies.Prospecting signs have been found as well as certain amounts of resources,fully showing the prospecting potentials in the area.It is expected that further prospecting work can yield good prospecting achievements.