| 内蒙古额济纳旗格日勒图铜多金属矿成因及找矿潜力 |
| Received:February 24, 2023 Revised:September 20, 2023 点此下载全文 |
| 引用本文：贾润幸.内蒙古额济纳旗格日勒图铜多金属矿成因及找矿潜力[J].Geology and Exploration,2024,60(2):207-221 |
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| 基金项目:阿拉善盟融拓铜业开发有限公司项目“内蒙古额济纳旗格日勒图铜多金属矿概略研究及外围前景分析”资助 |
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| 中文摘要:内蒙古珠斯楞地区为我国北山成矿带的东延区，格日勒图铜多金属矿是近些年在该区发现的重要铜多金属矿床，矿床赋存于上石炭统白山组上段（C2b2）火山岩。为研究该矿床的成因类型，本文开展对矿石矿物组构、矿石地球化学、石英包裹体和矿物电子探针等分析测试。结果表明，矿石中的脉石矿物主要为石英，石英中包裹体气液比15%～40%，均一温度156℃～395℃，平均温度为308.7℃。盐度（wt％NaCl）2.41～6.64，平均为4.34，属于低盐度中高温流体。石英中的气体包裹体可分为两种类型，一类为N2+ CH4，另一类为N2。综合研究认为该矿床的成因类型为岩浆热液型矿床。铜多金属矿体在垂向具有明显的分带，上部发育高品位的次生富集带，金属硫化物主要为蓝辉铜矿、辉铜矿、黄铁矿、闪锌矿和少量的砷黝铜矿、黄铜矿等；下部主要为黄铁矿、闪锌矿、方铅矿、黄铜矿和砷黝铜矿等。矿床的形成可初步划分为火山沉积成岩期、岩浆热液成矿期和表生成矿期。研究认为在该矿床深部及外围地区依然具有较大的找矿潜力。 |
| 中文关键词:矿石矿物组构 地球化学 流体包裹体 矿床成因 找矿预测 格日勒图铜多金属矿 额济纳旗 内蒙古 |
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| Genesis and prospecting potential of the Geriletu copper polymetallic deposit in Ejina Banner, Inner Mongolia |
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| Abstract:The Zhusileng area in Inner Mongolia is the eastern extension of the Beishan metallogenic belt in China, and the Geriletu copper polymetallic deposit has been recently discovered in this area. This deposit was hosted in the volcanic rocks of the upper part of Upper Carboniferous Baishan Formation (C2b2). In order to study the genetic type of the deposit, this work analyzed the ore mineral fabric, ore geochemistry and quartz fluid inclusions, and conducted mineral electron microprobe analysis. Results show that the gangue minerals in the ores are mainly quartz, the gas-liquid ratio of inclusions in quartz ranges from 15% to 40%, the homogenization temperature ranges from 156℃ to 395℃, with an average temperature of 308.7℃. The salinity (wt%NaCl) ranges from 2.41 to 6.64, with an average value of 4.34. The ore-forming fluid belongs to low-salinity, medium-high temperature fluid. The gas inclusions in quartz can be divided into two types, i.e., N2+CH4 type and N2 type. This deposit is indicated to be a magmatic hydrothermal deposit, and the copper polymetallic ore bodies display obvious vertical zonation. The upper part of the copper ore bodies develops high-grade secondary enrichment, with metal sulfides digenite, chalcocite, pyrite, sphalerite and small amounts of tennantite and chalcopyrite, and the lower part is mainly composed of pyrite, sphalerite, galena, tennantite and chalcopyrite. The formation of the deposit can be preliminarily divided into volcanic sedimentary diagenesis stage, magmatic hydrothermal mineralization stage and supergene mineralization stage. It is inferred that there is still a great prospecting potential in the deep part and peripheral areas of the deposit. |
| keywords:ore mineral fabric, geochemistry, fluid inclusion, deposit genesis, prospecting prediction, Geriletu copper polymetallic deposit, Ejina Banner, Inner Mongolia |
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