新疆玉勒肯哈腊苏铜矿床地质特征及找矿方向

GEOLOGICAL CHARACTERISTICS AND EXPLORATION DIRECTION OF THE YULEKENHALASU COPPER DEPOSIT,XINJIANG

玉勒肯哈腊苏斑岩铜矿床位于新疆卡拉先格尔斑岩铜矿带.矿床主要赋存于花岗闪长斑岩、二长花岗斑岩及中泥盆统北塔山组辉斑玄武岩等火山岩中.矿区韧性剪切变形强烈,岩体和矿体糜棱岩化发育.矿区发育多种蚀变,由矿化岩体向外总体具钾长石化-黑云母化-硅化、绢云母化-青磐岩化蚀变分带特征.矿化主要分布于钾长石化-黑云母化-硅化蚀变带中.矿体呈脉状、透镜状、不规则状.矿化呈浸染状、团块状、团斑状、细脉浸染状和细脉状.成矿元素以铜为主,伴生金、钼、银.化探、磁法、激电测量及频谱激电测深等对矿区勘查工作具较好指示作用.矿区处于1∶5万物探激电异常和Au,Cu,Ag,Mo,Cr,Ni,Co等元素组成的化探异常中.从矿体不同勘探线剖面及水平标高的矿体形态及变化趋势分析,矿区南东深部有见矿可能,推断矿区北部频谱激电测深异常及1∶5万激电异常部位有矿体、矿化体存在.

The Yulekenhalasu porphyry copper deposit locates in the Karaxianger porphyry copper metallogenic belt,Xinjiang,hosted by granodiorite-porphyry,monzonitic granite porphyries and augite basalt of Middle Devonian Baytashan Formation.The copper district experienced intensive ductile shearing deformation,with ore bodies and their hosting rocks are mylonitized.Alterations were zoned and consisted of the central K-feldspar alteration-biotization-silicification associated with the ore bodies and the outer sericitization-propylitization in the country rocks.Shape of the ore bodies were vein-and len-like.Metal sulfide（pyrite and chalcopyrite） were present as disseminated,massive,vein-veinlet like.The ore-forming metallic elements included copper,gold,molybdenum,and silver.Results of geochemical prospecting,magnetic survey,IP and spectrum polarization sounding applied during exploration process provided some valuable information for prediction of buried ore bodies.There was an evident geophysical IP anomalous zone and multi-element（e.g.,Au,Cu,Ag,Mo,Cr,Ni,Co）geochemical anomalous zone in the mineral deposit.Attitude of ore bodies outlined by different exploration profiles indicate that the deeper area at south-eastern part of the deposit may yield the possibility of encountering the mineralized bodies.The northern part of the deposit,where spectrum induced polarization sounding anomalous zone and other IP anomalous zone delineated by 1∶50000 geophysical surveys also have the possibility to discover more ore bodies or mineralized bodies.