Relationship between Characteristics of Tungsten and Molybdenum Ore Deposits in Wurinitu and Early Cretaceous Granite
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摘要: 通过对内蒙古苏尼特左旗乌日尼图铜铅锌钨钼矿地质背景、矿床地质特征、矿床成因类型、岩石化学特征的研究,总结归纳了乌日尼图钨钼矿与小型中酸性岩体的成矿关系、围岩对成矿的控制作用、围岩蚀变类型与成矿的关系、钨钼等多金属矿的地球物理、地球化学特征,以及矿床的区域展布和时间演化规律.指出中生代早白垩世中酸性岩体为本矿区的矿源体,且该岩石类型亦为二连-东乌旗-梨子山成矿带上钼矿的重要矿质来源,是内蒙古草原覆盖区寻找钨钼多金属矿应重点关注的岩石类型.Abstract: The geological settings,geological characteristics,petrochemical features of tungsten and molybdenum ore deposits in Wurinitu of Sunitezuoqi,Inner Mongolia,are studied in detail,metallogenic relationship between the characteristics of tungsten and molybdenum ore deposit in Wurinitu and that of small neutral and acid rock bodies is explored and the controlling effect of its wall rocks on the mineralization is discussed,and the relationship between the alteration types of the wall rocks is also probed. In addition,geophysical and geochemical features of tungsten and molybdenum deposits,the distribution and evolution laws of the deposits are presented in this paper. It is found that neutral and acid rock bodies in Early Cretaceous granite are source rocks for the metallogenic belt in Erenhot-Dongwuqi-Lizishang and is promising for future tungsten and molybdenum mineral exploration in the grassland of Inner Mongolia.
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图 1 区域地质矿产图
1.地质界线；2.断层；3.乌日尼图钼矿及详查区范围；4.钼矿；5.铜钼矿；6.第四系冲、洪积；7.更新统阿巴嘎组；8.新近系上新统宝格达乌拉组；9.古近系始新统伊尔丁曼哈组；10.上侏罗统白音高老组；11.上侏罗统玛尼吐组；12.上侏罗满克头鄂博组；13.上石炭下二叠统宝力高庙组；14.下泥盆统泥鳅河组；15.中奥陶统巴彦呼舒组；16.中下奥陶统乌宾敖包组第三岩段；17. 中下奥陶统乌宾敖包组第二岩段；18.燕山早期黑云二长花岗岩；19.燕山早期黑云母花岗岩；20.燕山早期石英粗面斑岩；21.燕山早期钾长花岗岩；22.华力西晚期中细粒黑云母花岗岩；23.华力西晚期中粗粒黑云母花岗岩；24.华力西晚期黑云母二长花岗岩；25.华力西晚期花岗闪长岩；26.华力西晚期闪长岩；27.华力西中期黑云母花岗岩；28.华力西中期碱长花岗岩
Fig. 1. Regional geological and mineral map
图 2 乌日尼图矿区地质简图
1.第四系风成砂；2.第四系砾石层；3.中下奥陶统乌宾敖包组三段；4.中下奥陶统乌宾敖包组二段；5.细粒花岗岩；6.花岗斑岩；7.石英斑岩；8.矽卡岩；9.地层产状；10.实测地质界线及侵入岩界线；11.详查区范围；12.550勘探线位置
Fig. 2. Wurinitu mining area geological sketch
图 3 乌日尼图矿区550勘探线剖面
1.第四系；2.粉砂质板岩；3.大理岩；4.花岗斑岩；5.细粒二长花岗岩；6.破碎带；7.钼矿；8.钨矿；9.钻孔；10.隐伏花岗斑岩体
Fig. 3. Wurinitu mining 550 exploration line profile
图 4 高精度磁测等值线平面图
1.磁测零值线；2.磁测等值线；3.极值；4推测断烈；5.磁异常编号；6.详查区范围
Fig. 4. High precision magnetic measurements isoline map
表 1 AP6号异常地球化学特征
Table 1. AP6 anomalous geochemical characteristics
元素 面积S(km2) 极大值max 均值x 衬度Ac 规模Ac×S 离差δ 浓度分带 备注 W 2.914 597.470 48.000 4.800 13.986 57.300 4 该组元素为成矿元素与主要伴生元素，组合好，强度高，浓集中心明显 Mo 1.221 31.930 2.380 1.587 1.937 2.440 4 Cu 1.687 519.900 59.100 2.366 3.990 65.500 4 Ag 1.834 3.341 0.370 1.831 3.358 0.270 4 Pb 0.607 802.700 73.900 2.957 1.796 119.000 4 Zn 0.940 961.000 189.000 2.400 2.200 180.000 4 As 1.351 894.000 161.649 2.021 2.729 86.289 4 为主要的伴生元素，与主成矿元素相吻合 Sb 1.103 46.930 8.319 2.080 2.294 6.460 4 Hg 1.669 94.500 21.667 1.444 2.411 11.633 3 Sn 2.147 100.000 11.132 2.226 4.780 10.654 4 Bi 1.486 1 030.600 38.432 7.686 11.424 89.615 4 Au 0.330 9.620 2.748 1.832 0.605 1.829 3 分布在上述元素异常范围内 注：Au、Hg的含量单位为10-9，其余元素的含量单位为10-6. 
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表 2 岩石化学成分表(%)
Table 2. Chemical characteristics of rocks
岩性 样品数 SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 烧失量 总量 1细粒花岗岩 3 76.40 0.065 13.04 0.41 0.62 0.04 0.18 1.15 3.45 4.56 - 0.10 100.13 2细粒花岗岩 4 76.44 0.130 11.88 0.92 2.45 0.04 0.00 0.28 3.10 5.48 0.03 0.50 100.25 3斑状花岗岩 17 75.12 0.160 12.35 0.73 1.94 0.01 0.06 0.45 3.78 4.79 0.03 0.54 99.96 4二长花岗斑岩 1 73.03 0.200 13.13 1.48 0.80 0.05 0.97 1.35 3.38 4.25 0.05 99.82 5二云花岗岩 6 74.32 0.120 13.60 0.90 1.24 0.09 0.55 0.79 3.12 452 0.10 99.35 注：1、2号样为乌日尼图样品；3号样为小东沟样品，程小珍等(2007)；4号样为准苏吉花样品；5号样为黎彤和饶纪龙(1963)中国二云花岗岩.
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