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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (6): 706-717.doi: 10.11872/j.issn.1005-2518.2018.06.706

所属专题: 专题名称

• • 上一篇    下一篇

山西灵丘县梨园金矿地质特征及控矿因素分析

鞠培姣1,2()   

  1. 1. 东华理工大学地球科学学院,江西 南昌 330013
    2. 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
  • 收稿日期:2018-03-16 修回日期:2018-09-04 出版日期:2018-12-31 发布日期:2019-01-24
  • 作者简介:鞠培姣(1988-),女,山东临沂人,讲师,博士,从事矿床学、岩石学及矿床流体包裹体研究工作。
  • 基金资助:
    有色金属成矿预测与地质环境监测教育部重点实验室(中南大学)开放基金资助项目“湖南包金山金矿多因复成成矿机制研究”(编号:2017YSJS01)资助

Geological Characteristics and Ore-controlling Factors of Liyuan Gold Deposit, Shanxi Province

Peijiao JU1,2()   

  1. 1. School of Earth Sciences,East China University of Technology,Nanchang 330013,Jiangxi
    2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment MonitoringCentral South University,Ministry of Education,Changsha 410083,Hunan
  • Received:2018-03-16 Revised:2018-09-04 Online:2018-12-31 Published:2019-01-24

摘要:

山西梨园金矿位于太行山构造—岩浆—多金属成矿带上,出露地层为新太古界阜平群条带状片麻岩夹斜长角闪岩。矿体总体呈手掌状,主要赋存于NNE向构造带中。矿石中金属矿物主要为黄铁矿,其次为方铅矿、闪锌矿和黄铜矿,非金属矿物主要有石英、钾长石、斜长石和绢云母,贵金属为自然金(银金矿)。矿区围岩蚀变主要有硅化、绢云母化和黄铁矿化,与金矿化关系密切。矿床的形成经历了热液期和表生期,其中热液期(主成矿期)又可划分为石英硅化阶段、石英—黄铁矿阶段、石英—硫化物阶段和石英—碳酸盐阶段。通过野外地质调研和室内分析,总结了含矿围岩及构造控矿规律,指明了找矿标志,并分析了成矿作用,认为梨园金矿为受断裂破碎带控制的岩浆热液蚀变岩型金矿。研究成果为区内找矿提供一定的科学依据。

关键词: 地质特征, 矿体特征, 控矿因素, 矿化阶段, 成矿作用, 梨园金矿, 山西省

Abstract:

Liyuan gold deposit is located in the tectonic-magmaic-polymetallic metallogenic belt of Taihang Mountain.The outcropping strata are mainly banded gneiss and amphibolite of Neo-Archean Fuping Group. The orebody is generally hand-shaped and mainly occurs in the NNE-trending structural zone.The metal minerals in ore are mainly pyrite,followed by galena,sphalerite and chalcopyrite.The non-metallic minerals are mainly quartz, potassium feldspar, plagioclase and sericite.The precious metal is natural gold (silver-gold ore). The wall-rock alteration closely related to gold mineralization are mainly silicification,sericitization and pyrite mineralization.The formation of the deposit can be divided into two episodes,including hydrothermal episode and epigenetic episode.The hydrothermal episode is the main mineralization period,which can be divided into four stages,namely,quartz silification stage,quartz-pyrite stage,quartz-sulfide stage and quartz-carbonate stage.Based on field geological survey and indoor analysis,the ore-bearing wall-rocks and strutural ore-controlling raw were summarized,the prospecting mark was specified,and the metallogenic process was preliminarily analyzed. It is considered that Liyuan gold deposit belongs to magmatic hydrothermal altered rock type gold deposit controlled by fracture zone.The results provide certain scientific basis for gold prospecting in this area.

Key words: geological characteristics, orebody characteristics, ore-controlling factors, mineralization stage, metallogenesis, Liyuan gold mine, Shanxi Province

中图分类号: 

  • P612

图1

梨园金矿矿区地质图"

图2

各中段矿体平面形态特征"

图3

矿体边界特征"

图4

自然金(银金矿)显微照片"

表1

金矿物电子探针成分"

序号 Au Ma Cu Ka Ag La Te La Sb La Bi Ma Total
1 59.453 0 35.695 0.080 0 0.540 95.769
2 66.731 0.033 30.550 0.073 0 0.581 97.968
3 66.274 0 31.344 0.063 0 0.465 98.145
4 65.469 31.130 0.005 96.604
5 67.769 30.536 0.037 98.342
6 61.231 31.379 0.115 0.558 93.283
7 63.312 31.830 0 0.401 95.542
8 61.637 31.574 0.047 0.604 93.861
9 63.740 29.374 0.044 0.487 93.645
10 58.348 36.092 0.064 0.379 94.883
11 61.271 30.723 0.063 0.445 92.502
12 62.567 28.751 0.063 0.416 91.798
13 60.407 0.043 36.453 0.109 0 0.390 97.403

表2

各元素原子数百分含量"

序号 Au Ma Cu Ka Ag La Te La Sb La Bi Ma Total
1 47.461 0 52.033 0.099 0 0.406 100
2 54.131 0.083 45.251 0.091 0 0.444 100
3 53.428 0 46.14 0.078 0 0.354 100
4 53.523 46.471 0.006 100
5 54.836 45.118 0.046 100
6 51.355 48.055 0.148 0.441 100
7 51.976 47.714 0 0.31 100
8 51.393 48.072 0.06 0.474 100
9 54.061 45.492 0.058 0.389 100
10 46.788 52.846 0.079 0.287 100
11 51.974 47.588 0.083 0.356 100
12 54.144 45.432 0.085 0.339 100
13 47.326 0.105 52.149 0.132 0 0.288 100

图5

银金矿电子探针分析图"

图6

黄铁矿镜下特征"

图7

其他金属矿物镜下特征"

图8

矿石结构构造特征"

图9

围岩蚀变特征"

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