吉林六道崴子铁铜多金属矿床成因及找矿方向研究

Ore-genesis and Prospecting Direction of Liudaowaizi Iron-copper Polymetallic Deposit in Jilin Province

目的针对吉林白石砬子白钨矿矿床的发现,研究矿床成因,建立找矿标志,为深入研究矿床地质特征和区域找矿提供参考依据。方法在结合前人研究成果的基础上,通过对区域地质背景、矿区(床)地质特征、矿体特征和矿物生成顺序的研究,探讨该矿床的成因和找矿方向。结果六道崴子铁铜多金属矿床共发现7条铜矿体,伴生铁、银、金、锡,矿体产于二叠系庙岭组大理岩与燕山早期石英闪长岩接触部位,赋矿岩石主要为石榴子石矽卡岩,矿化阶段大致划分为矽卡岩阶段、石英硫化物阶段、低温热液阶段、表征氧化阶段。结论研究表明,成矿作用与古太平洋板块向吉黑东部的俯冲作用有关,发生在活动大陆边缘的岛弧环境,矿床类型为与岩浆期后热液作用有关的接触交代(矽卡岩)型铁铜多金属矿床。应重视异常类比法在找矿中的运用,同时加强矿床周边岩体及古生界地层的研究,注意新类型找矿,扩大矿床资源远景。

Objective In view of the discovery of Jilin Baishilazi scheelite deposit,the genesis of the deposit was studied to establish the prospecting criteria for deposit,in-depth study the genesis of the deposit and provide reference for regional prospecting.Methods On the basis of previous research results,through the study of regional geological background,geological characteristics,ore body characteristics and mineral formation sequence,the genesis and prospecting direction of the deposit were discussed.Results There were 7copper orebodies in the Liudaowaizi iron-copper polymetallic deposit.The staples were copper and ubordinate production were iron,silver,gold,tin,etc.The major orebodies occured along the contact zone between the Early Yanshanian gabbrodiorite and the Permian marble.The ore-hosting rock in the ore deposit was dominated by the garnet.Conclusion In combination with the evolution of tectonic background of Northeast China,both the gabbrodiorite and the associated iron-copper mineralization in the Liudaowaizi deposit were formed in island-arc environment resulted from the subduction of the Paleo Pacific plate to the Eurasian plate at the beginning of the Jurassic period.Based on the ore-forming geological factors and mineralization characteristics,the deposit belongs to the contact-metasomatic type.Attention should be paid to the application of abnormality analogy in prospecting minerals and study on magmatic body around ore deposit.The study on statum in the strate of Palaezoic should be strengthened at the same time to explore new mine and expand resources perspective.