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黄金科学技术 ›› 2021, Vol. 29 ›› Issue (4): 477-488.doi: 10.11872/j.issn.1005-2518.2021.04.186

• 矿产勘查与资源评价 •    下一篇

新疆焉耆县松树达坂金矿区岩石地球化学异常特征及找矿效果

范红科1(),郭根明2,董波波2,张凯2,刘豫新1   

  1. 1.西安西北有色地质研究院有限公司,陕西 西安 710054
    2.陕西润基矿业有限公司,陕西 西安 710061
  • 收稿日期:2020-10-19 修回日期:2021-06-05 出版日期:2021-08-31 发布日期:2021-10-08
  • 作者简介:范红科(1972-),男,甘肃泾川人,正高级工程师,从事地质矿产勘查与地球化学勘查工作。1105637838@qq.com

Characteristics of Rock Geochemical Anomalies and Its Prospecting Effect of the Songshudaban Gold Deposit in Yanqi County,Xinjiang

Hongke FAN1(),Genming GUO2,Bobo DONG2,Kai ZHANG2,Yuxin LIU1   

  1. 1.Xi’an Northwest Research Institute of Nonferrous Metals Co. ,Ltd. ,Xi’an 710054,Shaanxi,China
    2.Shaanxi Runji Mining Co. ,Ltd. ,Xi’an 710061,Shaanxi,China
  • Received:2020-10-19 Revised:2021-06-05 Online:2021-08-31 Published:2021-10-08

摘要:

为了查明松树达坂金矿区土壤地球化学异常源,寻找金的矿化富集段,在矿区开展1∶2 000岩石地球化学剖面测量工作,圈定近NWW向展布的Au、As、Sb、Hg、Cu和Bi等元素原生晕综合异常带2条。通过异常查证,新发现金矿体3条,工程控制矿体长60~120 m,厚1.00~3.25 m,金品位为0.65×10-6~2.85×10-6,取得较好的化探异常圈定和地质找矿效果。综合分析矿区岩石地球化学综合异常和金矿化特征,认为与松树达坂次级韧性剪切带有关的中泥盆统萨阿尔明组第一亚组上段是寻找金矿的有利地段,也是重要的找矿标志层位。金矿体严格受韧性剪切带控制,矿区具有寻找韧性剪切带型金矿床的潜力。

关键词: 岩石地球化学, 剖面测量, 地球化学异常特征, 韧性剪切带, 松树达坂金矿区, 焉耆县, 新疆

Abstract:

Songshudaban gold deposit in Yanqi County is located in the middle part of the Southwest Tianshan of Xinjiang gold polymetallic metallogenic belt,and near north margin of suture zone between the Tarim plate and Kazakhstan-Erie plate.Songshudaban gold deposit produced in the Sahentuohai-Dashankou brittle-ductile shear zones.The ore-bearing rock are a set of fine clastic rocks and quartz veins from the middle Devonian Saaerming formation.The NW and NWW trending faults developed in the mining area,and metallogenic geological conditions are superior.1∶10 000 geological survey,1∶10 000 soil geochemical survey and explora-tory trench reveal,and other works have been carried out in the area.Four gold orebodies were found,but these orebodies have the features of small scale,low grade and extends unsteadily,the prospecting results are not outstanding.To identify abnormal sources of soil geochemical anomalies and search mineralized rich areas of gold,expand the size of the existing gold orebodies or find new gold orebodies in Songshudaban area,the 1∶2 000 rock geochemistry profile measurement were carried out,two primary halo comprehensive anomaly zones of Au,As,Sb,Hg,Cu,Bi with NWW trending were delinead.The anomalies are mainly distributed in limonite mineralized,kaolinized sericite phylliterelated to ductile shear zone.The mineralization and alteration of sericite chlorite slate,andesite porphyry,marble and other strata on both sides of the shear zone is relatively weak.After anomaly verification,three new gold orebodies and mineralization spots were found.The engineering control gold orebodies are 60~120 m long and 1.00~3.25 m thick with a grade of 0.65×10-6~2.85×10-6,it means that the good geochemical anomalies and ore prospecting results have been achieved.According to the features of rock geochemistry and gold mineralization,it is believed that the first subgroup of middle Devonian Saaerming formation is the favorable strata for searching gold deposits,and it is very important ore-searching criteria.The gold deposit is strictly controlled by ductile shear zones.There is great potential to find ductile shear zone gold deposits in Songshudaban mine area.

Key words: rock geochemistry, profile measurement, characteristics of geochemical anomalies, ductile shear zone, Songshudaban gold deposit, Yanqi County, Xinjiang

中图分类号: 

  • P618.51

图1

松树达坂金矿区域地质简图(孟金祥等,2000a)1.第四系冲洪积物和残坡积物;2.上第三系砾岩和粉砂岩;3.渐新统—中新统桃园组砾岩;4.上二叠统灰岩和细砂岩;5.中—上石炭统卡拉达坂群砂岩夹砂砾岩和生物灰岩;6.下石炭统野云沟组灰岩和板岩;7.泥盆系哈孜尔布拉克组灰岩和白云岩;8.泥盆系阿萨尔明组绢云石英千枚岩、绢云绿泥石英千枚岩和板岩;9.泥盆系柳树沟组玄武岩和凝灰岩;10.志留—泥盆系夏哈勒恩郭勒组流纹质熔结凝灰岩和晶屑玻屑凝灰岩;11.志留—泥盆系呼斯坦希力组中基性火山碎屑岩;12.志留—泥盆系大山口组粉砂岩;13.元古宙霍拉山群黑云斜长片麻岩、斜长浅粒岩和角闪岩;14.华力西晚期花岗岩;15.华力西中期花岗岩;16.华力西中期闪长岩;17.华力西中期超基性岩;18.华力西早期花岗岩;19.元古宙花岗岩;20.金矿床;21.地质界线;22.断层;23.脆—韧性剪切带;24.工作区"

图2

松树达坂金矿区地质图(范红科等,2020)1.野云沟组灰岩和砂岩;2.中泥盆统萨阿尔明组第一亚组;3.高岭土化绢云石英千枚岩;4.褐铁矿化高岭土化绢云石英千枚岩;5.绢云绿泥板岩;6.安山岩和安山玢岩;7.地质界线;8.断层;9.矿体;10.土壤综合异常及编号"

图3

松树达坂金矿床矿石手标本和镜下特征(a)金矿体;(b)矿石中的“溶蚀”孔洞;(c)黄铁矿呈星点状分布;(d)矿石中的非金属矿物;Py-黄铁矿;Qz+Ser-非金属矿物;Qz-石英;Ser-绢云母;Jr-黄钾铁矾"

图4

松树达坂金矿区岩石地球化学测量采样点位图1.勘探线及编号;2.采样点位及编号"

表1

岩石地球化学剖面测量各元素地球化学参数统计"

元素样品数/件最大值最小值算术平均值富集系数变化系数叠加强度

新疆岩石背景值

(杜佩轩等,2002)

Cu5955 084.92.50127.902.9562.121.9422.34
Pb5957 0304.1063.401.5147.373.3412.60
Zn5958762.7083.301.1349.301.1762.95
W5953.110.150.680.7453.571.210.76
Mo59530.20.143.374.1892.161.320.61
Bi59517.50.020.552.5073.531.620.14
Hg59511 1984.00103.002.3873.733.7011.70
As5951 1151.1044.303.2978.523.304.08
Sb5953270.162.362.4154.882.880.34
Ag5958.310.010.250.2269.231.930.60
Au5952 3500.6033.2011.8179.424.850.58

表2

不同岩石组合中元素地球化学特征"

岩性含量
CuPbZnWMoBiHgAsSbAgAu
绢云绿泥石英片岩14553960.762.430.400.0821.281.060.2127.69
蚀变绢云石英千枚岩10428670.574.590.670.1278.904.480.2342.19
石英脉5499360.414.350.600.2786.312.020.4537.94
断层带15548590.394.320.770.0411.131.030.4331.90
全区岩石12863830.683.370.550.1044.312.360.2533.16

表3

各元素矿化蚀变叠加强度统计"

元素样品数/件剔除高值点数/个剔除前平均值剔除后平均值矿化蚀变叠加强度矿化蚀变叠加强度排序
Au5596033.206.852911
Hg55954103.0027.862002
As5595944.3013.411953
Sb559642.360.821844
Pb5594863.4019.01605
Ag559470.250.13916
Bi559300.550.34498
Cu55931127.9066.00607
W559330.680.56409
Mo559233.372.553010
Zn5591983.3071.002211

图5

岩石样品R型聚类分析谱系图"

表4

松树达坂金矿区各元素背景值与异常下限统计结果"

元素样品数/个异常平均值离差异常下限
Cu3436641100
Pb32619925
Zn3557135100
W3410.560.300.9
Mo3512.552.353.5
Bi3440.340.250.55
Hg32027.8620.5450
As31513.4110.5325
Sb3100.820.452.15
Ag3270.130.090.2
Au3146.855.4412.5

图6

岩石地球化学异常剖析图1.原生晕异常及编号;2.新发现的金矿体;3.地质界线;4.断层;5.典型原生晕剖面位置及编号;6.中泥盆统萨阿尔明组下段第一亚组;7.褐铁矿化绢云石英千枚岩;8.褐铁矿化高岭土化石英绢云千枚岩;9.绢云绿泥石英板岩;10.安山岩和安山玢岩"

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