庐枞地区西湾铅锌矿床与MVT型铅锌矿床地质特征对比研究  

Contrastive study on the geological characteristics between the Xiwan Lead-Zinc deposit in Luzong area and MVT-type Lead-Zinc deposits

作　　者：杜东旭[1] 张建明 程培生[1] 李壮[1] 汪曙潮 顾大年 DU Dongxu;ZHANG Jianming;CHENG Peisheng;LI Zhuang;WANG Shuchao;GU Danian(Geological Exploration Technology Institute of Anhui Province,Hefei 230031,Anhui,China)

机构地区：[1]安徽省勘查技术院,安徽合肥230031

出　　处：《矿产勘查》2021年第12期2332-2340,共9页Mineral Exploration

基　　金：安徽省地质勘查基金项目(2009-1-33,2015-2-4,2012-1-4,2018-1-Ⅰ)资助。

摘　　要：西湾铅锌矿位于庐枞火山岩盆地北东缘,近年来经过安徽省地勘基金投资,《无为县西湾铁多金属矿普查》项目工作的深入开展,确定其为大型铅锌矿床。矿床的成因类型尚未确定,笔者通过总结勘查成果,分析了西湾铅锌矿的矿床成因及成矿模式,从大地构造背景、容矿围岩、成矿特征、与岩浆活动的关系、矿体形态、矿物组合、矿石结构构造、容矿-控矿构造以及成矿流体来源等9个方面对比研究了西湾铅锌矿床与MVT型铅锌矿床的成矿地质特征。研究认为,西湾铅锌矿为受地层、构造双重控制的多金属矿床,控矿地层主要为三叠系东马鞍山组,控矿断裂主要黄屯-枞阳基底断裂。西湾铅锌矿成矿物质中的硫元素来源相对复杂,δ^(13)C表现为海相碳酸盐岩地层特征,成矿流体没有岩浆热液参与,很有可能来自盆地热卤水,叠加了大气降水的改造。西湾铅锌矿与MVT型铅锌矿床在多方面具有相似特征,大地构造背景均为盆地环境,容矿围岩均为碳酸盐岩,均为后生成矿与岩浆活动无直接关系,矿体形态均变化较大为层状、透镜状、不规则状等,矿物组合均较简单,矿石组构特征相似,控矿构造主要为断层、破碎带以及角砾岩。本文通过将西湾铅锌矿床与MVT型铅锌矿床的成矿特征进行对比,初步判定研究区铅锌矿为MVT型铅锌矿床,该矿床类型为庐枞地区新型矿床类型,这一认识对在本区寻找相似类型矿床具有借鉴意义。The Xiwan lead-zinc deposit is located on the north-eastern edge of the Luzong volcanic rock basin.In recent years,through the investment of the Anhui provincial geological prospecting fund and the in-depth work of the “General Survey of Xiwan Iron Polymetallic Deposits in Wuwei County” has been carried out,the Xiwan lead-zinc deposit is determined to be a large-scale lead-zinc deposit,but the genetic type of the ore deposit has not yet been determined.The authors summarized the exploration results,and analyzed the genesis and metallogenic model of the Xiwan lead-zinc deposit,to compare and study the geological characteristics between the Xiwan lead-zinc deposit and MVT-type lead-zinc deposits in 9 aspects,including the geotectonic background,ore-bearing surrounding rocks,metallogenic characteristics,the relationship with magmatic activity,ore body shape,mineral assemblage,ore fabric,ore-bearing-ore-controlling structure and the source of ore-forming fluids.The study believes that the Xiwan lead-zinc deposit is a polymetallic deposit controlled by strata and structure.The ore-controlling strata are mainly the East Ma’anshan Formation of Triassic,and the ore-controlling faults are mainly Huangtun-Zongyang basement fault.The source of sulfur in the Xiwan lead-zinc deposit is relatively complex and δ^(13) C shows the characteristics of marine carbonate strata.The ore-forming fluid has no magmatic hydrothermal participation,and is likely to come from the hot brine of the basin,superimposed by atmospheric precipitation.The Xiwan lead-zinc deposit and MVT-type lead-zinc deposits have similar characteristics in many respects.The similar characteristics are: the geotectonic background is basin environment;the ore-hosting surrounding rocks are carbonate rocks;both are post-generation minerals;there is no direct relationship with magmatic activity;the ore bodies vary greatly in morphology,such as stratified,lenticular,irregular,etc.;mineral assemblages are relatively simple;ore fabric features are similar;ore-contro

关 键 词：西湾铅锌矿 庐枞火山岩盆地 MVT型铅锌矿床 对比研究 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]