特提斯成矿域西部塞尔维亚Timok矿集区首例中硫化型浅成低温金矿床的厘定:以Zlatno Brdo金矿床为例  

Identification of the First Intermediate-sulfidation Epithermal Gold Deposit in the Timok Metallogenic Zone of Serbia,Western Tethys:A Case Study of the Zlatno Brdo Gold Deposit

作　　者：张安顺 谢桂青 刘文元[1] 单思齐[1] 黄柯 ZHANG Anshun;XIE Guiqing;LIU Wenyuan;SHAN Siqi;HUANG Ke(Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350108,Fujian,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;MNR Key Laboratory for Exploration Theory and Technology of Critical Mineral Resources,Beijing 100083,China)

机构地区：[1]福州大学紫金地质与矿业学院,福建福州350108 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]自然资源部战略性金属矿产找矿理论与技术重点实验室,北京100083

出　　处：《大地构造与成矿学》2023年第5期1110-1123,共14页Geotectonica et Metallogenia

基　　金：国家杰出青年科学基金项目(41925011);紫金矿业集团股份有限公司项目(01612012)联合资助。

摘　　要：特提斯成矿域发育多个世界级斑岩-浅成低温铜金矿床,Apuseni-Banat-Timok-Srednogorie(ABTS)斑岩-矽卡岩-浅成低温铜金成矿带位于特提斯成矿域西段。Timok矿集区位于ABTS成矿带中部,区内矿床成矿峰期主要集中在晚白垩世。Zlatno Brdo(以下简称ZB)金矿床是Timok矿集区近年新发现的金矿床(金资源量约30 t,平均品位1.11 g/t)。该矿床矿体受断裂控制,呈脉状产于晚白垩世斜长角闪安山岩中,其矿床类型和找矿潜力目前仍不清楚。本文对热液蚀变矿物和硫化物进行电子探针分析,发现ZB金矿床发育中硫化态的硫化物组合(黄铜矿+黝铜矿)、与金矿化相关的低铁闪锌矿(FeS摩尔比平均为5.8%, n=11)和富Mn碳酸盐(MnO百分含量平均为2.68%, n=46),以及矿石中含与热液重晶石共生的金碲化物。利用探矿者(MinESoft)三维建模软件,分别对蚀变带和矿体进行建模工作,结合区域地质特征,本文认为ZB金矿床为Timok矿集区首例中硫化型浅成低温热液金矿床,且该矿床北西方向具有较大的找矿潜力,热液重晶石可作为找矿标志之一。此外,同属于特提斯成矿域的冈底斯斑岩铜矿成矿带近年来发现多处晚白垩世大–中型矽卡岩铜金矿床,且该带普遍发育100~80 Ma岩浆岩,暗示冈底斯斑岩-矽卡岩铜金矿床外围有寻找晚白垩世浅成低温热液金矿床的潜力。The Apuseni-Banat-Timok-Srednogorie(ABTS)metallogenic belt is one of the world’s major porphyry-skarnepithermal Cu-Au metallogenic belts,which is located in the western part of the Tethys tectonic belt.The mineralization ages of deposits in the belt is mainly the Later Cretaceous.The Timok metallogenic zone is located in the middle part of the ABTS metallogenic belt.The Zlatno Brdo(ZB)Au deposit is a newly discovered deposit in the Timok district in the recent years.By the end of 2021,more than 100 drill holes have been implemented in the ZB deposit,with a total drill core length of more than 40,000 meters.The controlled+inferred resources are 30 tons of gold and 95 tons of silver,with an average grade of 1.11 g/t and 3.43 g/t,respectively.The ore-body is controlled by faults and occurs as veins in the Later Cretaceous plagioclase hornblende andesite.The genesis of the deposit and exploration criteria are still unclear.In this paper,altered minerals and sulfides assemblages have been investigated.The chalcopyrite,tetrahedrite and other mineral combinations indicated that they formed at an intermediate sulfide state.The Fe-poor sphalerites(the average FeS mole ratio is 5.8%,n=11)and Mn-rich carbonate(the average content of MnO is 2.68%,n=46)that associated with Au mineralization are representative minerals of typical intermediate sulfidation epithermal deposits.Native Au and Au-tellurides coexist with hydrothermal barite.Besides,we modeled the alteration zone and ore body using 3D modeling software(MinESoft),and found that the ore-bearing alteration zone pinched out to the southeast and extended to the northwest.Combined with regional geology,this paper identifies the ZB Au deposit as an intermediate sulfidation epithermal gold deposit.The northwestern part of the ZB deposit has great prospecting potential.Hydrothermal barite might be used as mineral marker for ore prospecting.In addition,many Late Cretaceous skarn Cu-Au deposits have been discovered in the Gangdese metallogenic zone,which also belongs to the Te

关 键 词：中硫化型浅成低温热液金矿床 特提斯成矿域 Timok矿集区 ZB金矿床 

分 类 号：P618.41[天文地球—矿床学] P618.51[天文地球—地质学]