| 内蒙古浩尧尔忽洞金矿区岩体地球化学特征及成矿意义 |
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| 引用本文： | 王玉峰,王建平,汪欢,孙虎,江向东,王斌,姜胜梅.内蒙古浩尧尔忽洞金矿区岩体地球化学特征及成矿意义[J].现代地质,2013(1):56-66. |
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| 作者姓名： | 王玉峰 王建平 汪欢 孙虎 江向东 王斌 姜胜梅 |
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| 作者单位： | 山东省第七地质矿产勘查院;桂林理工大学广西隐伏金属矿产勘查重点实验室;地质过程与矿产资源国家重点实验室,中国地质大学地球科学与资源学院;内蒙古太平矿业有限责任公司 |
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| 基金项目： | 国家重点基础研究发展计划项目(2012CB416600);国家自然科学基金面上项目(41272106);中国地质调查局地质矿产调查评价专项(1212011220923;1212011085471);广西隐伏金属矿产勘查重点实验室开放课题(11-031-20-K6) |
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| 摘 要： | 内蒙古浩尧尔忽洞金矿位于华北地台北缘西段中元古代白云鄂博台缘凹陷带西部,矿区内有大面积花岗质岩体和岩脉出露,其岩性主要包括石英二长闪长岩、二长花岗岩和碱长花岗岩。通过岩相学特征和岩石地球化学特征分析,结合区域上同类型岩体的侵入时代,认为浩尧尔忽洞岩体形成于华北板块与西伯利亚板块同碰撞-后碰撞环境。其中二长花岗岩形成于同碰撞环境,该环境下由于板片持续俯冲,引起俯冲板片及地幔楔发生熔融,其上侵带来的热量致使下地壳物质部分熔融而形成该类型岩石的母岩浆;石英二长闪长岩形成于碰撞后隆起环境,是加厚下地壳熔融的产物;碱长花岗岩属于晚造山期A型花岗岩系列,该阶段地幔玄武质岩浆底侵,导致下地壳物质熔融,部分与其发生混染。结合浩尧尔忽洞金矿的成矿年龄、成矿流体特征及赋矿岩石有机地球化学特征,认为岩体的侵位提供了矿床形成必不可少的热量及部分成矿流体来源。
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| 关 键 词： | 花岗质岩体 岩石地球化学特征 大地构造环境 浩尧尔忽洞金矿 内蒙古 |
Geochemical Characteristics of Pluton in the Haoyaoerhudong Gold Deposit of Inner Mongolia and Its Ore-forming Significance |
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| WANG Yu-feng,WANG Jian-ping,WANG Huan,SUN Hu,JIANG Xiang-dong,WANG Bin,JIANG Sheng-mei.Geochemical Characteristics of Pluton in the Haoyaoerhudong Gold Deposit of Inner Mongolia and Its Ore-forming Significance[J].Geoscience——Journal of Graduate School,China University of Geosciences,2013(1):56-66. |
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| Authors: | WANG Yu-feng WANG Jian-ping WANG Huan SUN Hu JIANG Xiang-dong WANG Bin JIANG Sheng-mei |
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| Institution: | 1.No.7 Exploration Institute of Geology and Mineral Resources,Linyi,Shandong 276006,China; 2.Guangxi Key Laboratory of Hidden Metallic Ore Deposit Exploration,Guilin University of Technology,Guilin,Guangxi 541004,China; 3.State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences and Resources,China University of Geosciences, Beijing 100083,China;4.Inner Mongolia Pacific Mining Co.Ltd,Bayan Nur,Inner Mongolia 014010,China) |
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| Abstract: | The Haoyaoerhudong gold deposit is located in the west of the Mesoproterozoic Bayan Obo rift on the west section of the northern margin of the North China Platform.A lot of granitoid plutons and dykes appear in the interior and outskirts of the diggings mainly including quartz monzodiorite,monzonitic granite and alkali feldspar granite whose enclaves are named as monzogabbro.By analyzing the characteristics of petrography and petrogeochemistry,combining with the intrusion era of the same type plutons in the same region,the Haoyaoer-hudong pluton was considered to be formed in the syn-collisional and post-collisional environment of North China Plate and Siberia Plate.Among them,the monzonitic granite formed in syn-collisional environment,and is possibly influenced by the heat of melting of the underthrust plate and mantle wedge in the process of subduction,of which the parental magma derived from partial melting of lower crust;the quartz monzodiorite formed in the uplift environment of post-collisional,resulting from the melt of the thickening lower crust;the alkali feldspar granite belongs to the series of A-type granites of the late orogenic era when the mantle basaltic magma underplated leading to the lower crust melting and being mixed.Combing with the mineralization ages,the characteristics of the mineralization fluid and organic geochemistry of host rocks,the invasion of pluton is considered to offer essential heat and part of ore-forming fluid sources. |
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| Keywords: | granitoid pluton lithogeochemical characteristics tectonic environment Haoyaoerhudong gold deposit Inner Mongolia |
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