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黄金科学技术 ›› 2022, Vol. 30 ›› Issue (4): 508-517.doi: 10.11872/j.issn.1005-2518.2022.04.184

• 矿产勘查与资源评价 • 上一篇    

黑龙江省三合屯金矿床地质特征及找矿潜力分析

李博文1(),谷华娟1,李成禄1,刘宝山2,杨晓平2   

  1. 1.黑龙江省自然资源调查院,黑龙江 哈尔滨 150036
    2.中国地质调查局沈阳地质调查中心,辽宁 沈阳 110000
  • 收稿日期:2021-11-30 修回日期:2022-03-07 出版日期:2022-08-31 发布日期:2022-10-31
  • 作者简介:李博文(1985-),男,黑龙江哈尔滨人,高级工程师,从事金矿地质勘查与找矿研究工作。li_bowen_2008@163.com
  • 基金资助:
    黑龙江省重点研发计划项目“黑龙江省大型二道坎银矿资源综合利用及成矿作用研究”(GA21A204);黑龙江省国土资源科研项目“黑龙江省嫩江—黑河构造混杂岩地区成矿规律研究与找矿预测”(201603)

Geological Characteristics and Prospecting Potential of Sanhetun Gold Deposit in Heilongjiang Province

Bowen LI1(),Huajuan GU1,Chenglu LI1,Baoshan LIU2,Xiaoping YANG2   

  1. 1.Natural Resources Survey Institute of Heilongjiang Province, Harbin 150036, Heilongjiang, China
    2.Shenyang Geological Survey Center, China Geological Survey, Shenyang 110000, Liaoning, China
  • Received:2021-11-30 Revised:2022-03-07 Online:2022-08-31 Published:2022-10-31

摘要:

三合屯金矿是黑龙江省嫩江市新发现的一处小型金矿床,大地构造位置处于兴蒙造山带东段兴安地块与松嫩地块交会部位,多宝山岛弧带和嫩江—黑河构造混杂岩带、新开岭微地块、塔溪火山弧的会聚部位。近年来,通过开展国土资源大调查和矿产勘查工作,在矿区内圈定了多条金矿体,但缺乏对矿床成因和矿石类型的系统研究。因此,本研究重点对矿区矿体和矿石特征、区域构造控矿特征及典型金矿床成矿特征进行综合分析。研究表明:三合屯金矿产于白垩系火山岩、碎屑沉积岩与早石炭世糜棱岩化花岗岩的接触部位,矿石类型为构造蚀变岩;矿体总体走向NE,倾向NW,倾角较缓;围岩蚀变主要为硅化和绢云母化,矿石矿物主要为黄铁矿,还有少量闪锌矿和黄铜矿,还含有少量金矿物和碲化物。目前该矿床在延长和延深方向均未得到完全控制,具有较大的成矿潜力,嫩江—黑河构造混杂岩带是黑龙江省下一步开展金矿找矿突破的重要部位。

关键词: 地质特征, 构造控矿, 火山热液型, 成矿潜力, 三合屯金矿床, 黑龙江省

Abstract:

Sanhetun gold deposit is a newly discovered small-sized deposit in Nenjiang City,Heilongjiang Province,which is located in the eastern part of Xing-Meng orogenic belt,at the intersections of Xing’an and Songnen blocks,and the convergence sites of Duobaoshan island arc belt,Nenjiang-Heihe tectonic mélange belt,Xinkailing micro-block and Taxi volcanic arc.In recent years,a lot of gold orebodies have been delineated in the mining area through the large-scale investigation of land and resources and mineral exploration,however,the genesis of ore deposits and ore types are lack of systematic research.Therefore,the comprehensive analysis are focused on the characteristics of orebodies and ores in the mining area,the ore-controlling characteristics of regional structures and the metallogenic characteristics of typical gold deposit.The results show that Sanhetun gold deposit occurs in the overlapping area between Cretaceous volcanic rocks,clastic sedimentary rocks and Early Carboniferous mylonitic granites,and the ore type is tectonic altered rock.The orebody overall strikes NE,inclines NW with slow dip angle.The wall rock alteration is mainly silicification and sericitization.The ore minerals are composed of pyrite,sphalerite,chalcopyrite with minor native gold and telluride.At present,the gold deposit are not completely controlled in the extension and depth direction,and there is still great metallogenic potential.The Nenjiang-Heihe tectonic melange belt is an important part of the next breakthrough of gold prospecting in Heilongjiang Province.

Key words: geological characteristics, structural ore-controlling, volcanic hydrothermal type, metallogenic potential, Sanhetun gold deposit, Heilongjiang Province

中图分类号: 

  • P618.51

图1

三合屯金矿区地质简图1.第四系低漫滩堆积;2.上白垩统嫩江组;3.下白垩统甘河组;4.下白垩统九峰山组;5.早石炭世糜棱岩化花岗岩;6.金矿(化)体"

图2

三合屯金矿区29号勘探线剖面图1.下白垩统九峰山组;2.早石炭世糜棱岩化花岗岩;3.闪长玢岩;4.工业矿体;5.低品位矿体;6.金矿(化)体"

图3

三合屯金矿矿石和矿体顶底板特征(a)碎裂糜棱岩化花岗岩(金矿石);(b)黄铁矿化蚀变岩(金矿石);(c)金矿石与矿体底板渐变;(d)金矿石与矿体顶板"

表1

三合屯金矿矿石全分析样品元素含量统计"

样品编号AuAgAsSbHgPbZnWBiSnV
ZK1001QFX26.26165.7192.282.770.70551 903.243.39.8213.591.1523.01
ZK2905QFX2.1810.9250.071.420.3956103.045.812.531.101.5042.06
样品编号Fe*CoNiTiMnK*Ca*CrGeSeTl
ZK1001QFX5.957.1614.911 007.90390.773.900.4811.432.070.290.55
ZK2905QFX2.335.186.182 608.50183.172.581.308.111.450.740.48
样品编号Na*Mg*Si*S*Al*CdInGaTe
ZK1001QFX1.610.2132.482.035.090.840.0312.7387.78
ZK2905QFX2.140.4034.052.256.240.150.0519.175.60

图4

三合屯金矿床金—银系列矿物、碲化物赋存状态显微特征(a)~(d)金呈椭圆状、树枝状和不规则状包裹体赋存在黄铁矿中;(e)黄铁矿裂隙中发育的金;(f)黄铁矿中碲化物形态特征Py-黄铁矿;Gl-自然金"

图5

黑河—嫩江地区典型矿床分布图(底图据苗来成等,2003修改)1.中新生代沉积物;2.新生代火山岩;3.中生代火山沉积岩;4.上古生界;5.下古生界;6.构造片岩;7.花岗片麻岩;8.花岗岩;9.断层;10.拆离断层;11.糜棱岩化及混合岩化带(构造混杂岩带);12.构造混杂岩带外多金属矿床;13.构造混杂岩带内金矿床"

表2

三合屯金矿与永新金矿成矿特征对比"

成矿特征永新金矿三合屯金矿
大地构造位置多宝山弧盆系、龙江—黑河叠接消减带黑河—嫩江断裂带,嫩黑增生杂岩带
矿体赋存位置花岗质糜棱岩与石炭纪花岗岩接触带,闪长玢岩与矿体相伴产出糜棱岩化花岗质与白垩系九峰山组接触带,闪长岩、闪长玢岩脉与矿体相伴产出
矿床地质条件主成矿期为早白垩世,属于中低温热液型(构造蚀变岩型)矿床,矿体明显受NE向脆性断裂控制。矿体角度平缓,一般不超过30°,整体倾角约为10°主成矿期为早白垩世, 属于热液型矿床,受NNE向脆性断裂控制。矿体角度平缓,一般不超过30°,整体倾角约为10°
围岩蚀变硅化、绢云母化、绿泥石化、高岭土化和碳酸盐化硅化、绢云母化、绿泥石化、高岭土化和碳酸盐化
矿体平均品位1.00×10-6~4.16×10-61.31×10-6~8.80×10-6
赋矿岩石蚀变碎裂角砾岩、花岗质糜棱岩花岗质糜棱岩、硅化蚀变岩
矿石类型硅化破碎蚀变岩硅化破碎蚀变岩、热液角砾岩型
矿石构造网脉状、细脉浸染状、块状、角砾状网脉状、细脉浸染状、块状、角砾状
矿石矿物成分黄铁矿、石英、钾长石和钠长石黄铁矿和石英
金矿物种类自然金、银金矿和碲金银矿自然金、银金矿和碲金银矿
金矿物嵌存关系粒间金、包裹金和裂隙金粒间金、包裹金和裂隙金
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