| 内蒙古碾子沟钼矿床成矿流体来源、演化及成矿机理 |
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| 引用本文： | 孙丰月,王睿,王一存,李顺达,王可勇,石开拓,孙清飞,王文元.内蒙古碾子沟钼矿床成矿流体来源、演化及成矿机理[J].吉林大学学报(地球科学版),2020,50(3):768-780. |
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| 作者姓名： | 孙丰月 王睿 王一存 李顺达 王可勇 石开拓 孙清飞 王文元 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春 130061;2. 河北地质大学资源学院, 石家庄 050000;3. 新疆大学地质与矿业工程学院, 乌鲁木齐 830000 |
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| 基金项目： | 国家重点研发计划项目（2017YFC0601304） |
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| 摘 要： | 内蒙古自治区碾子沟钼矿床地处华北地台北缘西拉木伦钼成矿带西段，为一典型的中型石英脉型钼矿床。该钼矿床矿脉（体）主要产于燕山早期二长花岗岩-钾长花岗岩内NNW、NW向断裂构造体系之中，成矿作用过程经历了黄铁矿±辉钼矿＋石英（Ⅰ）、辉钼矿＋黄铁矿±黄铜矿＋石英（Ⅱ）、黄铜矿＋黄铁矿±闪锌矿＋石英（Ⅲ）及石英±方解石（Ⅳ）4个阶段。系统的流体包裹体岩相学、包裹体组分析、包裹体显微测温研究表明，矿床初始成矿流体为高温、中低盐度（490~550℃，盐度（w（NaC1））2%~10%，50~62 MPa）均匀的NaCl-H2O体系热液，δ18OH2O-SMOW（2.21‰）及δDH2O-SMOW（-68.9‰）表明其主要来源于岩浆热液；成矿流体上升并不断汇聚于容矿断裂空间，伴随温度、压力降低（380~460℃，26~40 MPa→360~420℃，25~30 MPa）而进入两相不混溶区，流体开始发生沸腾→强烈沸腾作用，导致成矿元素Mo大量沉淀富集成矿，成矿晚期残余流体与大气降水混合（δ18OH2O-SMOW为-2.41‰~2.51‰，δDH2O-SMOW为-110.1‰~-105.5‰），矿床属燕山早期中高温岩浆热液型钼矿床。
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| 关 键 词： | 碾子沟钼矿床 石英脉型 流体包裹体 成矿流体演化 内蒙古自治区 |
| 收稿时间： | 2019-06-15 |
Origin,Evolution of Ore-Forming Fluids and Metallogenic Mechanism of Nianzigou Molybdenum Deposit,Inner Mongolia |
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| Sun Fengyue,Wang Rui,Wang Yicun,Li Shunda,Wang Keyong,Shi Kaituo,Sun Qingfei,Wang Wenyuan.Origin,Evolution of Ore-Forming Fluids and Metallogenic Mechanism of Nianzigou Molybdenum Deposit,Inner Mongolia[J].Journal of Jilin Unviersity:Earth Science Edition,2020,50(3):768-780. |
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| Authors: | Sun Fengyue Wang Rui Wang Yicun Li Shunda Wang Keyong Shi Kaituo Sun Qingfei Wang Wenyuan |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. College of Resources, Hebei Geoscience University, Shijiazhuang 050000, China;3. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830000, China |
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| Abstract: | Nianzigou molybdenum deposit is located in the western part of the Xilamulun molybdenum metallogenic belt at the north margin of North China Craton, which is a medium-sized typical quartz vein type deposit. The ore veins mainly occur in the NNW, NW trending faults developed in the monzonitic granite-moyite intrusions of Early Yanshanian. The hydrothermal mineralization can be divided into four stages:pyrite ±molybdenite+quartz(Ⅰ), molybdenite+pyrite ±chalcapyrite+quartz (Ⅱ), chalcopyrite+pyrite ±sphalerite+quartz (Ⅲ), and quartz ±calcite (Ⅳ). The systematic study on petrography of fluid inclusions, fluid inclusion assemblages,and micro-thermometry shows that the primary ore forming fluids are of high temperature (490-550℃),low-medium salinity NaCl-H2O type solutions (10%-18%); their δ18OH2O-SMOW(2.21‰)and δDH2O-SMOW(-68.9‰)imply that they were originally from magmatic activities, and continuously up-rose and gathered into ore-controlling faults; later with the gradual decrease of temperature and pressure(380-460℃, 26-40 MPa→360-420℃, 25-30 MPa), the state of immiscible two-phase appeared, and the fluid began to boil, which resulted in the deposition of large amounts of Mo; at the late stage of the fluid evolution, the residual solution mixed with meteoric water. Nianzigou Mo deposit is a medium-high temperature magmatic hydro thermal deposit in Early Yanshanian. |
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| Keywords: | Nianzi gou molybdenum deposit quartz vein type fluid inclusion evolution of ore-forming fluids Inner Mongolia Autonomous Region |
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