西准噶尔莫都诺娃地区多金属矿成矿特征及找矿方向

Metallogenic characteristics and prospecting direction of polymetallic deposits in modunova area,western Junggar

莫都诺娃地区位于北金齐火山岩盆地,该盆地是在华力西晚期伸展构造作用下形成的陆相火山岩盆地,是火山岩型铀矿化及其它金属成矿的有利构造环境,盆地周边断裂发育。其中近东西向展布的拜亭齐断裂、莫都诺娃断裂为研究区的主控矿断裂,构造活动强烈,具多期演化特点,依据岩石变形特征及遥感影像特征,对其进行了研究和区分,研究区内2大断裂控制着各种矿产的分布和成矿元素的运移,根据地质路线调查及物探异常特征显示,主断裂两侧不同方向次级构造交汇部位是各元素富集的有利地段。区内侵入岩十分发育,受断裂构造影响,岩体形态总体呈环带状产出。在研究区中部侵入岩体的两侧发现有隐伏的钼矿体产出。分析区内成矿特征,笔者指出了2个找矿方向,首先是主控矿断裂旁侧次级断裂构造交汇部位是区内的最佳成矿部位,其次注重寻找深部隐伏的酸性斑岩体及其地表出露岩体内外接触带部位是多金属矿化成矿的有利条件,找矿潜力较大。

Modunova area is located in the North Jinqi volcanic basin.The basin is a continental volcanic basin formed under the extensional structure of late Variscan.It is a favorable structural environment for volcanic uranium mineralization and other metal mineralization.Faults are developed around the basin.Among them,baitingqi fault and modunova fault distributed in the near east-west direction are the main ore controlling faults in the study area,with strong tectonic activity and multi-stage evolution characteristics.They are studied and distinguished according to the characteristics of rock deformation and remote sensing image.The two major faults in the study area control the distribution of various minerals and the migration of ore-forming elements.According to the geological route investigation and geophysical anomaly characteristics,The intersection of secondary structures in different directions on both sides of the main fault is a favorable area for element enrichment.The intrusive rock in the area is very developed.Affected by the fault structure,the rock mass is generally produced in a circular band.Hidden molybdenum ore bodies are found on both sides of the intrusive rock mass in the middle of the study area.By analyzing the metallogenic characteristics in the area,the author points out two prospecting directions.First,the intersection of secondary fault structures on the side of the main ore controlling fault is the best metallogenic position in the area.Second,pay attention to the search for the deep concealed acid porphyry and the internal and external contact zone of its surface exposed rock mass,which is the favorable condition for polymetallic mineralization and has great prospecting potential.