GEOLOGY AND GENESIS OF DABAISHITOUGOU TITANIUM MAGNETITE DEPOSIT IN MIDDLE QILIAN MOUNTAINS
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摘要:
大白石头沟地区位于中祁连托莱南山北缘, 大地构造位置处于中祁连岩浆弧带, 成矿区带属于加里东期钨、稀有金属、铜(钛、锑、金)成矿带. 钛磁铁矿化体主要产于古元古代托赖岩群片麻岩段、中元古代湟中群磨石沟组片岩段和石英岩段内, 矿化体受岩性控制明显, 并具多期成矿的特点. 通过对钛矿物的岩相观察、电子探针成分分析及人工重砂分析, 厘定了钛矿物以钛磁铁矿为主, 含少量钛铁矿和微量金红石等. 通过深入研究钛磁铁矿成矿地质征及赋存状态, 认为: 1)矿化类型属于火山喷流-沉积型; 2)伟晶岩体不是成矿物质来源, 成矿物质最大可能来源于火山喷发带来的富钛质超基性-基性火山岩, 且为早期分离结晶后堆晶而成. 经大量文献资料查证, 在中祁连大白石头沟地区发现钛磁铁矿化体尚属首次, 因此本研究成果可为后续的勘查及相关工作提供理论依据.
Abstract:The Dabaishitougou area in the northern margin of Tuolai South Mountain in middle Qilian Mountains, tectonically located in the mid-Qilian magmatic arc belt, belongs to the Caledonian W, rare metals, Cu(Ti, Sb, Au) metallogenic belt. The titanium magnetite mineralized bodies, obviously controlled by lithology and characterized by multistage mineralization, are mainly occurred in the gneiss member of Palaeoproterozoic Tuolai Group and the schist and quartzite members of Moshigou Formation of Mesoproterozoic Huangzhong Group. With petrographic observation, electron probe microanalysis(EPMA) and artificial heavy concentrate analysis, it is determined that the titanium minerals are dominated by titanium magnetite with minor ilmenite and trace rutile. The source of titanium minerals is discussed based on the in-depth study of metallogenic characteristics and occurrence state of titanium magnetite deposit. It is considered that the mineralization is of volcanic exhalation-sedimentary type, proving that the ore-forming materials are most likely from Ti-rich basic-ultrabasic volcanic rocks brought by volcanic eruption formed after the early fractional crystallization and accumulation rather than from the pegmatite body. It is the first time that titanium magnetite bodies have been found in Dabaishitougou area of middle Qilian Mountains through verification of documents. Thus the study results can provide a theoretical basis for follow-up exploration.
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Key words:
- titanium magnetite /
- rare metal /
- occurrence state /
- deposit genesis /
- middle Qilian Mountains
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表 1 钛磁铁矿石电子探针分析数据
Table 1. EPMA results of titanium magnetite ores
测点 Na2O MgO FeO K2O Al2O3 SiO2 Cr2O3 CaO TiO2 MnO CaO NiO V2O3 总量 1 / / 77.81 / 0.05 0.03 / 0.02 12.07 0.06 0.10 / 0.41 90.55 2 / / 76.01 / 0.05 0.05 0.07 / 14.18 0.71 0.07 / 0.33 91.47 3 / / 74.96 / 0.04 0.06 0.10 / 12.66 0.27 0.04 / 0.27 88.4 4 / 0.02 80.14 0.19 0.19 0.17 0.21 0.05 7.02 0.06 0.04 / 0.23 88.32 5 / / 79.97 / 0.10 0.02 / / 10.18 0.75 0.09 / 0.24 91.35 平均值 / / 77.78 / 0.09 0.07 0.08 / 11.22 0.37 0.07 / 0.03 90.02 中国地质大学（北京）国家重点实验室测定援含量单位：% 
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表 2 钛磁铁矿人工重砂分析结果表
Table 2. Artificial heavy concentrate results of titanium magnetite ores
矿石类型 质量 金红石 钛铁矿 钛磁铁矿 其余 质量 百分比 质量 百分比 质量 百分比 质量 百分比 矿石 208 000 < 1 < 0.01 6 794 0.654 59 334 5.706 2 013 870 93.64 矿石 208 000 / / 1 600 0.154 86 020 8.272 1 992 380 91.574 矿石 1 940 000 / / 6 516 0.672 80 460 8.294 1 853 024 91.034 核工业地质分析测试研究中心测定. 质量单位: mg.
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