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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (6): 718-728.doi: 10.11872/j.issn.1005-2518.2018.06.718

• • 上一篇    下一篇

内蒙古额济纳旗辉森乌拉西金矿成矿特征及成矿模式分析

辛杰1,2(),密文天1,2,3,4,5,*(),关瑜晴1,席忠6,张雪松1   

  1. 1. 中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南 长沙 410083
    2. 成都理工大学国土资源部地学空间信息技术重点实验室,四川 成都 610059
    3. 成都理工大学数学地质四川省重点实验室,四川 成都 610059
    4. 西南石油大学天然气地质四川省重点实验室,四川 成都 610500
    5. 内蒙古工业大学矿业学院,内蒙古 呼和浩特 010051
    6. 内蒙古第一地质矿产勘查开发院,内蒙古 呼和浩特 010000
  • 收稿日期:2018-01-14 修回日期:2018-06-23 出版日期:2018-12-31 发布日期:2019-01-24
  • 通讯作者: 密文天 E-mail:xinjie1990@126.com;miwentian1982@163.com
  • 作者简介:辛杰(1990-),男,内蒙古鄂尔多斯人,硕士研究生,从事矿床成因研究工作。
  • 基金资助:
    西南石油大学天然气地质四川省重点实验室开放基金“青藏高原形成对酒西盆地油气成藏的影响”(2016trqdz08);稀有金属元素的扩散模型及其对伟晶岩型稀有金属矿床勘查指示意义”(KLGSIT2016-02);数学地质四川省重点实验室开放基金“基于MRAS证据权重法的雪峰山中段金矿成矿预测”(scsxdz201602);中南大学有色金属成矿预测与地质环境监测教育部重点实验室开放基金“雪峰山中段基于 MRAS 证据权重法的金矿预测与评价”(2017YSJS06);内蒙古自治区高校科学研究项目“内蒙古赵井沟铌钽矿成因及成矿潜力评价”(NJZY14067);蒙古工业大学科学研究重点项目“普通地质学课程教学中的实践性研究”(ZD201322)

Metallogenic Characteristics and Metallogenic Model of the Gold Deposits in Huisenwulaxi Area of Ejin Banner,Inner Mongolia

Jie XIN1,2(),Wentian MI1,2,3,4,5,*(),Yuqing GUAN1,Zhong XI6,Xuesong ZHANG1   

  1. 1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South University,Changsha 410083,Hunan,China
    2. Key Laboratory of Geoscience Spatial Information Technology of Ministry of Land and Resources,Chengdu University of Technology,Chengdu 610059,Sichuan,China
    3. Geomathematics Key Laboratory of Sichuan Province,Chengdu University of Technology,Chengdu 610059,Sichuan,China
    4. Sichuan Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,Sichuan,China
    5. School of Mines,Inner Mongolia University of Technology,Hohhot 010051,Inner Mongolia,China
    6. Inner Mongolia First Geological Mineral Exploration Institute,Hohhot 010020,Inner Mongolia,China
  • Received:2018-01-14 Revised:2018-06-23 Online:2018-12-31 Published:2019-01-24
  • Contact: Wentian MI E-mail:xinjie1990@126.com;miwentian1982@163.com

摘要:

辉森乌拉西金矿位于阿拉善地块北缘,是一处具有大型规模远景的金矿床,探讨该金矿床的成矿特征和成矿模式具有重要的地质意义。通过对矿床地质特征和区域地球化学特征的分析,结合微量元素分析及流体包裹体研究,对矿床成因和成矿模式进行了初步探讨。元素地球化学特征及微量元素分析显示研究区为一高背景的金地球化学块体,二叠系哈尔苏海组为矿源层。流体包裹体研究表明金矿形成于中温(240~260 ℃)环境,成矿流体为低盐度、低密度流体。区内褶曲、揉皱、片理化带和构造蚀变带为金矿床的导矿及容矿构造。金矿成因类型为受中温岩浆热液影响的蚀变岩型金矿床,成矿模式为古蒙古洋壳向阿拉善地块俯冲时引发Au元素活化富集并形成矿源层,晚二叠世岩浆侵入时金活化、迁移最终富集成矿,后期受构造变形和风化剥蚀作用影响发生次生富集。

关键词: 微量元素, 流体包裹体, 二叠纪, 金矿, 成矿特征, 成矿模式, 辉森乌拉西, 内蒙古

Abstract:

The Huisenwulaxi gold deposit,located in the northern Alxa block,is a prospective area with great potential for exploration.It has important geological significance to discuss the metallogenic characteristics and metallogenic model of the gold deposit.By summarizing the geological characteristics of the deposit,regional geochemical characteristics,results of fluid inclusions and trace elements,preliminary discussions was conducted on the genesis and metallogenic model of the gold deposit.Geochemical and trace element data revealed that the Huisenwulaxi area is characterized by the high gold background content.Permian Ha’ersuhai Formation has played a role of a mineral source layer.The study of fluid inclusion indicated that the temperature of mineralization was between 240 ℃ and 260 ℃,which was an moderate temperature environment.Folds,schistositized zone and structural fractural zone in the area composed the ore-conducting tectonic and ore-containing tectonic.Huisenwulaxi gold deposit is altered rock type gold deposit.Affected by meso temperature magmatic hydrothermal.The metallogenic model of gold deposit is early preliminary enrichment of gold and the initial formation of primary source bed when the crusts of ancient Mongolia sea subducted to Alxa block,along with the magmatic instrusion of the late Permian,the remobilization,migration and enrichment of gold,secondary enrichment of gold deposits occurred in the late stage under the influence of structural deformation and weathering denudation.

Key words: trace elements, fluid inclusion, Permian, gold deposit, metallogenic characteristics, metallogenic model, Huisenwulaxi, Inner Mongolia

中图分类号: 

  • P618.51

图1

阿拉善地块构造位置及其北缘区域地质简图(据张建新等[13]修改)"

图2

辉森乌拉西金矿床地质图"

图3

辉森乌拉西金矿典型矿化蚀变带及岩石样品照片"

表1

辉森乌拉西金矿矿体特征"

矿化蚀变带(含金矿化带)编号 矿体编号 矿体规模 产状 Au平均品位/(×10-6
长度/m 平均厚度/m 走向/(°) 倾向/(°) 倾角/(°)
HSP1 Au1-1 170 1.48 180° 270° 85° 1.51
Au1-3 65 0.86 170° 260° 83° 1.22
Au1-4 80 0.95 170° 260° 79° 1.00
HSP1-1 Au1-5 75 0.95 170° 260° 80° 1.06
HSP2 Au2-1 510 1.22 190° 280° 78° 3.60
Au2-2 430 1.28 194° 284° 82° 1.85
Au2-3 75 0.99 205° 295° 87° 16.39
HSP3 Au3-1 70 2.15 175° 265° 85° 1.38
HSP5 Au5-2 60 0.98 40° 130° 76° 1.15
Au5-3 55 0.97 40° 130° 75° 1.12
Au5-5 145 0.59 40° 130° 65° 2.16
Au5-6 90 0.82 36° 126° 68° 11.26
Au5-7 360 1.94 36° 126° 68° 2.50
Au5-8 90 0.87 38° 128° 72° 1.22
Au5-9 130 0.97 40° 130° 65° 25.21
Au5-10 150 0.96 44° 134° 83° 1.21
Au5-11 90 0.89 220° 310° 75° 1.76
HSP6 Au6-1 70 0.93 195° 285° 65° 1.15
HSP9 Au9-2 70 4.64 210° 300° 75° 1.28

表2

辉森乌拉西金矿石英脉包裹体测温结果"

样品编号 赋存矿物 大小/μm 气液比/% 盐度[w(NaCl)]/% 均一温度/℃
AP6-Q1L 石英脉 4×6~7×12 20~30 1.06~15.47 183~318(28)
AP6-Q2L 石英脉 3×5~6×10 25~30 1.47~5.71 242~358(31)
AP6-Q3L 石英脉 4×4~6×12 20~25 2.90~11.93 210~411(27)
AP6-Q4L 石英脉 3×3~6×6 20~25 3.87~6.74 227~375(19)
AP6-Q5L 石英脉 2×5~5×10 25~35 3.39~7.31 279~377(18)

图4

辉森乌拉西金矿床流体包裹体显微照片"

图5

流体包裹体均一温度直方图"

图6

流体包裹体盐度直方图"

图7

流体包裹体温度—盐度散点图"

表3

辉森乌拉西金矿矿石微量元素测定结果"

样品编号 微量元素及含量
Be Sr Y Nb Ba La Ce Pr Nd Sm Eu Gd Dy Re Pb U Zr Hf Au
AP2-02 4.87 2021 56.4 184 763 342 607 67.8 237 33.4 9.72 27.3 13.7 0.009 32.6 7.8 1415 31.6 0.008
AP6-01 7.36 591 48.4 253 1380 258 441 47.1 163 24.5 7.51 21.4 12.3 0.007 16.9 11.2 570 19 0.03
AP6-03 2.11 653 40.7 122 782 245 448 49.6 179 24.5 6.95 20.3 10.2 0.005 25.9 7.96 592 16 0.043
AP8-01 0.67 163 9.76 5.26 2315 15.8 29.5 3.45 12.5 2.24 1.03 2.05 1.32 0.001 10.6 1 135 5.77 0.019
AP9-03 2.55 56.9 16 10.5 426 33.8 64 7.56 27.2 5.06 0.64 3.91 3.39 0.002 31.5 3.48 145 5.14 0.003

图8

研究区构造演化示意图"

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