新疆巴里坤小加山东钨钼矿特征及成因分析

Characteristics and Genesis of East Xiaojiashan W-Mo Deposit in Balikun of Xinjiang Province

新疆巴里坤小加山东钨钼矿位于新疆东天山北部巴里坤县,是河南省地矿局第二地质勘查院2010年发现的小型钨钼矿,勘查程度达到详查。估算WO 3(332)+(333)金属量18317 t,矿床平均品位0.305%;Mo(332)+(333)金属量4346 t,矿床平均品位0.063%;该矿床的发现填补了东天山北部钨钼矿的空白,提高了对该区域矿产勘查工作的研究程度;矿床为一典型的钨钼共生矿,矿床类型为热液石英脉型矿床,矿体呈脉状产出;钨钼矿空间分布位置关系有明显的分带特征,矿床上部0~300 m以钨为主,下部300~700 m以钼为主;矿体主要赋存在泥盆系中统大南湖组下亚组(D 2 d b)火山碎屑岩(灰色凝灰岩)中,脆性断裂构造控矿,成矿母岩为华力西中期的斑状钠长花岗岩,为钨钼矿的形成提供了物质来源。

East Xiaojiashan W-Mo deposit is located in the north part of East Tianshan in Balikun county,Xinjiang province.It is a small scale W-Mo deposit discovered in 2010 by No.2 Geological Exploration Institute of Henan Geological Mineral Exploration and Development Burea.The degree of exploration reaches detailed investigation.The estimated resource is,WO 3(332)+(333)metal quantity 18317 t,average grade of deposit is 0.305%;Mo(332)+(333)metal quantity 4346 t,average grade of deposit is 0.063%.The discovery of this deposit filled the void of W-Mo deposit discovery in the north part of East Tianshan mountain and increased the research degree of mineral exploration in this area.The deposit is a typical W-Mo paragenic ore and hydrothermal quartz vein type,the ore body appears as a vein.The spatial distribution of tungsten-molybdenum has obvious zonal characteristics.The upper 0~300 m of the deposit is mainly tungsten,and the lower 300~700 m is mainly molybdenum.The ore body mainly occurs in volcaniclastic rock(gray tuff)in the lower subgroup of Dananhu formation(D 2 d b)of middle devonian system.The ore-controlling structure is brittle fracture,and the mother rock is porphyritic sodium feldspar granite in the middle variscan period,it provides the main ore-forming material sources.