河南洛宁沙沟-龙门银矿区新发现金矿体地质特征及意义  

Geological characteristics and significance of newly discovered gold orebody in Shagou-Longmen silver mining area of Luoning County,Henan

作　　者：崔春萌 葛保京 陈克成 范国栋 CUI Chunmeng;GE Baojing;CHEN Kecheng;FAN Guodong(Silvercorp Metal Mining Co.,Ltd.,Beijing 100000,China;Henan Faende Mining Co.,Ltd.,Luoyang 471700,Henan,China)

机构地区：[1]希尔威矿业有限公司,北京100000 [2]河南发恩德矿业有限公司,河南洛阳471700

出　　处：《矿产与地质》2022年第2期323-333,共11页Mineral Resources and Geology

摘　　要：沙沟—龙门银矿床位于华北克拉通南缘熊耳山地区。近年来找金取得新突破,通过总结沙沟—龙门银矿的矿床地质特征、新发现金矿体岩性特征,初步得出沙沟金矿类型为石英脉型,构造控矿,不受围岩岩性制约。在此基础上,通过对控矿构造的应变分析、矿石结构分析,认为沙沟金矿发育于挤压背景下的剪切带中,形成时间早于银铅锌矿,可划分为两个成矿阶段:石英-黄铁矿化-铬云母化阶段(含金)和石英-铁白云石(少量)阶段,分别对应于控矿剪切带由剪-压向剪-张的演化过程。银铅锌矿化形成于后期拉张充填,也可划分为两个成矿阶段:石英-铁白云石(大量)阶段和石英-铅锌银-黄铁矿矿化阶段,断裂性质表现为张性。龙门矿区新发现的缓倾斜金矿类型为构造蚀变岩型,对比同构造单元的槐树坪金矿(大型金矿),地质特征相似度高,构造产状特征吻合,矿化蚀变类型一致。可将典型的缓构造、钾化、黄铁绢英岩化、网脉状细小石英脉作为寻找该类型金矿的找矿标志。The Shagou-Longmen silver deposit is located in Xiong'er Mountain area in the southern margin of the North China Craton.In recent years,new breakthroughs have been made in the gold exploration.This paper summarizes the geological characteristics of Shagou-Longmen silver deposit and the lithologic characteristics of newly discovered gold veins.It is preliminarily concluded that Shagou gold deposit is quartz vein type,which is controlled by structure and not restricted by surrounding rock lithology.On this basis,through the strain analysis of ore-controlling structure and ore texture analysis,it is considered that Shagou gold deposit is developed in the shear zone under the compression environment and is formed earlier than the silver-lead-zinc deposit,and can be divided into two metallogenic stages,quartz-pyrite-chromphyllite stage(with gold)and quartz-iron dolomite(minor amount)stage,which correspond to the evolution process of the ore-controlling shear zone from shear-compression to shear-tension,respectively.The Ag-Pb-Zn mineralization is formed in the late extensional filling process,which can also be divided into two metallogenic stages,the quartz-iron dolomite(massive)stage and the quartz-Pb-Zn-Ag-pyrite mineralization stage.The fracture property is tensile.The newly discovered gently dipping gold orebody in Longmen mining area is structural alteration rock type.Compared with Huaishuping gold deposit(large gold deposit)in the same tectonic unit,the geological characteristics are highly similar,the structural occurrence characteristics are consistent,and the mineralization alteration type is consistent.The typical gently dipping structure,potassium alteration,beresitization and fine quartz netveins can be regarded as the prospecting marks for this type of gold deposit.

关 键 词：金矿化 沙沟—龙门银矿床 石英脉型 构造蚀变岩型 熊耳山地区 河南洛宁 

分 类 号：P618.51[天文地球—矿床学]