METALLOGENIC CHARACTERISTICS OF SHAOXIEGOU TUNGSTEN-COPPER-MOLYBDENUM DEPOSIT IN EJINA QI, INNER MONGOLIA
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摘要:
额济纳旗少斜沟钨铜钼矿赋存于石炭纪-二叠纪花岗岩类岩体与下石炭统绿条山组的接触带附近及岩体内. 矿化蚀变分带总体呈环状, 最外带为碳酸盐化、绿帘石化、绿泥石化; 次外带为夕卡岩化、角岩化、白钨矿化; 中带为硅化、云英岩化、辉钼矿化; 内带为硅化、孔雀石化、黄铜矿化. 由外向内成矿元素从高温到低温富集, 形成钨矿→钼矿→铜矿. 另外, 结合矿体特征、含矿岩体的矿石地球化学特征和锆石U-Pb测年资料等讨论了矿床的成因类型和成矿时代, 认为该矿床成因类型为斑岩型, 成矿时间为305.1±1.9 Ma, 为晚石炭世.
Abstract:The Shaoxiegou tungsten-copper-molybdenum deposit in Ejina Qi is occurred in the contact zone between the Carboniferous-Permian granitoid body and Lower Carboniferous Lyutiaoshan Formation, and in the nearby rock mass as well. The mineralized alteration zonation is generally annular, with the outermost zone of carbonatization, epidotization and chloritization, the secondary outer zone of skarnization, hornfelsization and scheelite mineralization, the middle zone of silicification, greisenization and molybdenite mineralization, and the inner zone of silicification, malachitization and chalcopyrite mineralization. From outside to inside, metallogenic elements are enriched from high temperature to low, forming tungsten deposit → molybdenum deposit → copper deposit. The paper also discusses the genetic type and metallogenic age of the deposit combined with the orebody characteristics, geochemical characteristics of ore-bearing rock mass and zircon U-Pb dating data. It is considered that the deposit is genetically of porphyry type, with the metallogenic time of 305.1±1.9 Ma, which was formed in Late Carboniferous.
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表 1 少斜沟矿区矿体特征表
Table 1. Orebody characteristics of Shaoxiegou orefield
矿体编号 长度/m 厚度/m 品位/% 产状 形态 Mo1 330 Mo：0.45~1.00/0.72 Mo：0.037~0.149/0.114 南西翼210°∠20° 凸弧状 Mo2 350 Mo：0.72~2.17/1.44 Mo：0.073~0.166/0.143 北东翼30°∠40° 凸弧状 Mo3 280 Mo：0.80~0.71/0.75 Mo：0.106~0.160/0.135 北东翼30°∠45° 凸弧状 Mo4 200 Mo：0.53~0.93/0.73 Mo：0.030~0.066/0.048 北东翼30°∠（20~40°） 凸弧状 Mo4-1 120 Mo：0.94 Mo：0.135 210°∠20° 细脉状 Mo4-2 120 Mo：1.23 Mo：0.120 210°∠20° 细脉状 Mo5 240 Mo：0.94~1.05/1.00 Mo：0.041-0.292/0.159 北东翼30°∠40° 凸弧状 Mo6 100 Mo：1.00 Mo：0.032 51°∠63° 细脉状 Mo7 120 Mo：1.22~11.04/4.11 Mo：0.034~0.119/0.065 南西翼210°∠10°，北东翼30°∠40° 凸弧状 Mo8 120 Mo：0.93~1.00/0.96 Mo：0.058~0.194/0.110 南西翼210°∠20°，北东翼30°∠40° 凸弧状 Mo9 120 Mo：0.93~0.95/0.94 Mo：0.034~0.075/0.054 南西翼210°∠20°，北东翼30°∠40° 凸弧状 Mo10 120 Mo：0.90~0.95/0.92 Mo：0.050~0.135/0.094 南西翼210°∠20°，北东翼30°∠26° 凸弧状 Mo11 120 Mo：1.00~1.14/1.07 Mo：0.020~0.271/0.154 南西翼210°∠20°，北东翼30°∠26° 凸弧状 Mo12 120 Mo：1.73~7.00/3.51 Mo：0.011~0.058/0.031 南西翼210°∠8°，北东翼30°∠30° 凸弧状 Cu2：3.00 Cu2：0.101~0.133/0.104 Cu3：2.17~6.35/3.91 Cu3：0.106~0.119/0.109 Mo13 120 Mo：0.94~1.78/1.29 Mo：0.057~0.408/0.205 南西翼210°∠18°，北东翼30°∠26° 凸弧状 Mo14 120 Mo：1.37~2.78/2.07 Mo：0.050~0.070/0.060 南西翼210°∠18°，北东翼30°∠26° 凸弧状 Mo15 120 Mo：1.74~3.82/2.58 Mo：0.062~0.128/0.031 南西翼210°∠（27~29°），北东翼30°∠26° 凸弧状 Mo16 120 Mo：0.88~3.67/1.82 Mo：0.075~0.354/0.160 南西翼210°∠20°，北东翼30°∠26° 凸弧状 Mo17 120 Mo：1.31 Mo：0.119 210°∠26 细脉状 Cu1 50 Cu：1.50 Cu：0.12~0.15/0.13 北东翼20°∠40° 凸弧状 Cu4 50 Cu：1.40 Cu：0.299 北东翼30°∠35° 凸弧状 W1 100 WO3：0.40~4.55/2.47 WO3：0.064~0991/0.366 350°∠45° 脉状 W2 260 WO3：0.90 WO3：0.048 50°∠78° 脉状 W3 280 WO3：1.00 WO3：0.077 11°∠69° 脉状 W4 650 WO3：0.40~4.95/2.41 WO3：0.064~0.407/0.112 0°∠（45~50°） 脉状 W5 330 WO3：1.40 WO3：0.066 330°∠78° 脉状 W6 150 WO3：1.60 WO3：0.039~0.109/0.065 355°∠53° 脉状 W7 430 WO3：0.7~1.00/0.85 WO3：0.092~0.218/0.166 0°∠（44~72°） 脉状 注：厚度、品位表示为“最小值~最大值/平均值”. 
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