滇西北香格里拉地区钨矿成矿规律及找矿方向

Metallogenic regularity and prospecting direction of tungsten deposits in Shangri-La area,NW Yunnan Province,China

滇西北香格里拉地区已成为我国重要的铜钼资源勘查开发基地,区内的燕山期岩浆岩带呈南北向纵跨义敦岛弧、甘孜-理塘结合带及扬子西缘坳陷带,并伴随着钨钼多金属矿化,形成了休瓦促、麻花坪等大中型钨多金属矿床。区内的钨矿床与花岗岩有直接成因和空间联系,具有剩余重力低异常、弱正磁异常、钨锡钼铋组合异常及钨锡自然重砂异常特征。本文通过休瓦促、麻花坪典型矿床分析,总结钨矿时空规律、控矿因素及成矿模式,结合区域重力、航磁、化探、重砂等异常,综合分析该区具有寻找石英脉型、矽卡岩型、岩浆热液型钨多金属矿的找矿潜力,并探讨了钨矿找矿方向。

The Shangri-La area,NW Yunnan province,has become an important Cu-Mo exploration and development base in China.The Yanshanian intrusions longitudinally cross the Yidun terrane,Gantze-Litang suture zone,and western margin of the Yangtze Block from north to south,accompanied by W-Mo polymetallic mineralization in the region.Several large-/medium-sized tungsten deposits are discovered in this belt,e.g.,the Xiuwacu and Mahuaping deposits.The tungsten metallogenesis is genetically-spatially related to the coeval granitoids,and the deposits are characterized by low residual gravity anomaly,week positive magnetic anomaly,W-Sn-Mo-Bi anomaly association,and W-Sn natural placer abnormal.Basing on the systematic studies of the typical Xiuwacu and Mahuaping deposits,this study aims to comprehensively analyse the potential quartz-vein type,skarn type,hydrothermal type tungsten polymetallic deposits by means of anomalies of regional gravity,aeromagnetism,geochemistry and placer.The prospecting direction of tungsten in the region is discussed.