文章摘要
杜东旭,张建明,程培生,李壮,汪曙潮,顾大年.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[J].矿产勘查,2021,12(12):2332-2340
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
投稿时间:2021-04-12  
DOI:
中文关键词: 西湾铅锌矿  庐枞火山岩盆地  MVT型铅锌矿床  对比研究
英文关键词: the Xiwan lead-zinc deposit  the Luzong volcanic rock basin  MVT-type lead-zinc deposits  contrastive study
基金项目:本文受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。
作者单位
杜东旭 安徽省勘查技术院 安徽 合肥 230031 
张建明 安徽省勘查技术院 安徽 合肥 230031 
程培生 安徽省勘查技术院 安徽 合肥 230031 
李壮 安徽省勘查技术院 安徽 合肥 230031 
汪曙潮 安徽省勘查技术院 安徽 合肥 230031 
顾大年 安徽省勘查技术院 安徽 合肥 230031 
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中文摘要:
      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,δ13C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。
英文摘要:
      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 .uids. 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 δ13C shows the characteristics of marine carbonate strata. The ore-forming .uid 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 strati.ed, lenticular, irregular, etc.; mineral assemblages are relatively simple; ore fabric features are similar; ore-controlling structures are mainly faults, fracture zones and corners Conglomerate. By comparing the metallogenic characteristics of the Xiwan Pb-Zn deposit with MVT-type Pb-Zn deposits, this paper preliminarily determines that the Xiwan Pb-Zn deposit is an MVT-type Pb-Zn deposit, which is a new type of deposit in the Luzong ore concentration area. The knowledge is of reference signi.cance for .nding similar types of deposits in this area.
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