| 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。 |
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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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