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Gold Science and Technology ›› 2022, Vol. 30 ›› Issue (4): 508-517.doi: 10.11872/j.issn.1005-2518.2022.04.184

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

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

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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

CLC Number: 

  • P618.51

Fig.1

Geological map of Sanhetun gold deposit"

Fig.2

Sectional diagram of No.29 exploration line in the Sanhetun gold deposit"

Fig.3

Characteristics of ore and orebody roof and floor in Sanhetun gold mine"

Table 1

Statistics of element content of total analysis ore samples in Sanhetun gold deposit"

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

Fig.4

Microscopic characteristics of occurrence states of Au-Ag series minerals and telluride in the Sanhetun gold deposit"

Fig.5

Distribution map of typical deposits in Heihe-Nenjiang area（base map modified after Miao et al.，2003）"

Table 2

Comparison of metallogenic characteristics between Sanhetun gold deposit and Yongxin gold deposit"

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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