LA-ICP-MS cassiterite U-Pb ages and the geological significance of the Maogaitu Sn ore spot in Hexigten Banner, Inner Mongolia
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摘要:
毛盖吐锡矿点为北京矿产地质研究院在大兴安岭南段新发现的矿点, 位于内蒙古克什克腾旗境内。矿点地处大兴安岭中南段多金属成矿带, 矿化类型为锡石石英脉型。矿石矿物主要为锡石和少量闪锌矿、方铅矿、黄铜矿以及银的矿物, 脉石矿物主要为石英以及少量的萤石。该矿由于首次发现, 研究程度较低, 关于其矿床成因、成矿时代等规律尚不明确。大兴安岭中南段多金属成矿带上发育多个锡多金属矿床, 目前的研究表明这些锡多金属矿床的成矿年龄多集中在早白垩世, 成因与早白垩世花岗岩相关。为了研究毛盖吐锡矿与区域锡多金属成矿作用的联系, 开展了对毛盖吐锡矿点成矿时代的研究, 本研究选取1件石英脉型锡矿石样品进行LA-ICP-MS锡石U-Pb定年, 获得锡石的207Pb/206Pb-238U/206Pb谐和年龄为130.2±3.4 Ma(
MSWD =2.9), 表明毛盖吐锡矿点形成于早白垩世, 这与区域上主要的锡多金属矿床成矿时代一致, 说明在大兴安岭中南段寻找锡多金属矿床拥有很好的前景。Abstract:The Maogaitu Sn ore spot in Hexigten Banner, Inner Mongolia is a newly discovered ore spot in the south section of Greater Khingan Range by Beijing Institute of Geology for Mineral Resources. It is tectonically located in the polymetallic metallogenic belt in the south centralsection of Greater Khingan Range, and the mineralization is characterized by cassiterite-quartz veins. Ore minerals of the ores are dominated by cassiterite with trace amounts of sphalerite, galena, chalcopyrite and silver minerals, while gangue minerals are mainly quartz and fluorite. As discovered recently without detailed studies, the genesis and age of the Maogaitu Sn ore spot are not clearly addressed. A number of tin polymetallic deposits are documented to develop in the polymetallic metallogenic belt in the south central section of Greater Khingan Range. The ages of these tin polymetallic deposits are constrained to be mostly around the Early Cretaceous, and to be genetically related to the Early Cretaceous granite. In order to address the relationship of the Maogaitu Sn ore spot with regional metallogeny, we obtained the age of the Maogaitu Sn ore spot by using LA-ICPMS U-Pb isotopic dating of cassiterite from a quartz vein-type tin ore sample. The results show that the sample yields a 207Pb/206Pb-238U/206Pb concordant age of (130.2±3.4) Ma (
MSWD =2.9), similar to the timing of the major tin mineralization event in the region. The new findings imply that the middle and south sections of Greater Khingan Range could be good targets for Sn polymetallic exploration. -
表 1 毛盖吐锡矿点LA-ICP-MS锡石U-Pb定年数据
Table 1. Results of LA-ICP-MS cassiterite U-Pb dating of the Maogaitu Sn ore spot
分析点号 同位素比值 207Pb/235U 2σ 206Pb/238U 2σ 238U/206Pb 2σ 207Pb/206Pb 2σ SHY-46-2 0.418 5 0.025 9 0.022 9 0.000 3 43.657 7 1.397 8 0.132 5 0.000 8 SHY-46-3 0.140 5 0.004 5 0.020 5 0.000 2 48.805 1 1.519 5 0.049 7 0.000 4 SHY-46-4 0.141 2 0.004 1 0.020 1 0.000 2 49.753 1 1.547 5 0.050 9 0.000 1 SHY-46-5 0.147 7 0.009 6 0.020 1 0.000 3 49.721 7 1.702 3 0.053 3 0.000 1 SHY-46-6 0.141 2 0.005 8 0.020 1 0.000 2 49.818 9 1.574 4 0.051 0 0.000 6 SHY-46-7 0.148 7 0.008 4 0.019 9 0.000 3 50.356 4 1.723 0 0.054 3 0.000 4 SHY-46-8 0.138 4 0.004 2 0.020 7 0.000 1 48.260 6 1.489 1 0.048 5 0.002 1 SHY-46-9 0.150 4 0.005 1 0.020 6 0.000 2 48.446 2 1.504 9 0.052 9 0.000 1 SHY-46-12 1.277 6 0.164 8 0.034 7 0.003 4 28.794 3 2.970 1 0.266 8 0.000 9 SHY-46-13 2.883 2 0.255 0 0.046 7 0.003 3 21.394 6 1.630 3 0.447 4 0.003 4 SHY-46-14 0.143 9 0.004 1 0.020 8 0.000 2 48.056 5 1.485 8 0.050 2 0.000 3 SHY-46-15 0.104 0 0.032 7 0.020 9 0.000 2 47.890 0 1.532 4 0.036 1 0.000 4 注:测试单位为中国地质大学(武汉)地质过程与矿产资源国家重点实验室;测试方法为激光剥蚀电感耦合等离子体质谱法(LA-ICP-MS) 表 2 维拉斯托锡多金属矿和毛盖吐锡矿点地质特征对比
Table 2. Comparison of geological characteristics between Weilasituo tin polymetallic deposit and the Maogaitu Sn ore spot
维拉斯托锡多金属矿床 毛盖吐锡矿点 区域地质背景 黄岗梁-甘珠尔庙多金属成矿带 黄岗梁-甘珠尔庙多金属成矿带 赋矿围岩 锡林郭勒杂岩 二叠系砂岩 矿体形态 主要为脉状 脉状 矿化组合 Sn-Cu-Pb-Zn-Ag Sn-Cu-Pb-Zn-Ag 矿物组合 锡石、黝锡矿、闪锌矿、方铅矿、黄铜矿、黄铁矿、黄玉、石英、萤石等 锡石、闪锌矿、方铅矿、石英、萤石等 蚀变 云英岩化 云英岩化 成矿岩体 碱长花岗岩 花岗岩 成矿时代 早白垩世 早白垩世 -
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