| 刘坤,黄丹峰,陈泳霖,赵焕.东秦岭成矿带马道铁矿床地质特征及找矿标志[J].地质找矿论丛,2025,40(3):291-300 |
| 东秦岭成矿带马道铁矿床地质特征及找矿标志 |
| Geological Characteristics and Ore-finding Indicators of the Madao Iron Deposit in the Eastern Qinling Metallogenic Belt |
| 投稿时间：2025-04-30 修订日期：2025-07-28 |
| DOI：10.6053/j.issn.1001-1412.2025.03.002 |
| 中文关键词: 马道铁矿床 东秦岭成矿带 地质特征 找矿标志 河南泌阳 |
| 英文关键词:Madao Iron Deposit Eastern Qinling Metallogenic Belt geological characteristics prospecting criteria Biyang County in Henan Province |
| 基金项目:河南省地质勘查基金项目“河南省龙王庙幅、乔端镇幅1:50 000矿产地质调查”(豫自然资函〔2025〕400号-7)资助。 |
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| 中文摘要: |
| 河南泌阳马道铁矿床位于秦岭多金属成矿带东段桐柏-大别成矿亚带。矿床赋矿地层为下古生界二郎坪群张家大庄组，赋矿岩性为斜长角闪(片)岩与石英钠长斑岩。矿床分为3个矿体，矿体呈似层状、透镜状产出，走向325°~345°，倾向235°~255°，倾角55°~70°。矿体厚度为1.06 m~12.15 m，平均厚度为3.23 m，厚度变化系数为112.15 %。矿体TFe品位为25.50 %~40.82 %，平均品味为30.33 %，mFe品位为16.75 %~26.41 %，平均品位为20.80 %，品位变化系数为94.63%，资源储量规模为小型。矿石为中贫等级铁矿石，类型以块状磁铁矿石为主，其次为浸染状磁铁矿石。矿石金属矿物主要有磁铁矿、赤铁矿、褐铁矿、黄铁矿等，脉石矿物多由石英、斜长石、角闪石组成。本文对马道铁矿床地质特征、矿床成因及成矿模式等方面进行了分析研究，结果表明：该矿床成矿与海底火山作用关系密切，成矿物质来源于上地幔，推测成矿时代为早志留世。矿床产出受赋矿地层与构造控制，赋矿地层中的铁矿化现象与磁异常为直接找矿标志，该特征对桐柏地区寻找同类矿床具有借鉴意义。 |
| 英文摘要: |
| The Madao Iron Deposit in Biyang city, Henan Province, is located in the eastern segment of the Qinling Polymetallic Metallogenic Belt, specifically within the Tongbai-Dabie Metallogenic Sub-belt. The ore deposit is hosted in the Zhangjiadazhuang Formation of the Early Paleozoic Erlangping Group. The ore-hosting lithology is composed of plagioclase amphibolite and quartz-sodic feldspar porphyry. The deposit is divided into three ore bodies. The ore bodies occur in sub-layered and lenticular forms. The ore bodies have a strike of 325°~345°, a dip direction of 235°~255°, and a dip angle of 55°~70°. The thickness of the ore body ranges from 1.06 m to 12.15 m, with an average thickness of 3.23 m. The coefficient of thickness variation is 112.15%. The TFe (total iron) grade of the ore body ranges from 25.50% to 40.82%, with an average of 29.27%. The mFe (magnetic iron) grade ranges from 16.75% to 26.41%, with an average of 20.80%. The grade variation coefficient of this deposit is 94.63%, and the resource reserves scale reaches the small category. It is classified as medium to low-grade iron ore, primarily consisting of massive magnetite ore, followed by disseminated magnetite ore. The main metallic minerals in the ore include magnetite, hematite, limonite, and pyrite, among others. The gangue minerals in the ore are mainly composed of quartz, plagioclase, and amphibole. This paper analyzes and studies the geological characteristics, genesis of the deposit, and ore-forming models of the Madao Iron Deposit. The results indicate that the formation of the deposit is closely related to submarine volcanic activity. The ore-forming materials of the deposit are derived from the upper mantle. The ore-forming age of the deposit is inferred to be the Early Silurian. The occurrence of the deposit is controlled by the ore-hosting strata and tectonic structures. Iron mineralization within the ore-hosting strata and magnetic anomalies serve as direct ore-finding indicators. This characteristic has reference significance for the search for similar deposits in the Tongbai area. |
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