| 宁夏西华山地区马场金矿床地质特征与成因 |
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| 引用本文： | 杨克成,母彩霞,海连富,姚世齐,梅超,柴德亮.宁夏西华山地区马场金矿床地质特征与成因[J].地质找矿论丛,2022,37(4):414-419. |
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| 作者姓名： | 杨克成 母彩霞 海连富 姚世齐 梅超 柴德亮 |
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| 作者单位： | 宁夏回族自治区地质博物馆, 银川 750011;宁夏回族自治区矿产地质调查院, 银川 750021;宁夏回族自治区矿产地质研究所, 银川 750021 |
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| 基金项目： | 宁夏回族自治区重点研发计划项目(编号:2021BEG03003)、宁夏回族自治区自然科学基金项目(编号:2021AAC03447)联合资助。 |
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| 摘 要： | 马场金矿床是宁夏西华山地区目前发现的规模最大的金矿床。文章从矿区地质特征入手,结合前人研究成果,对马场金矿床地质特征进行了详细归纳总结,并对金矿床成因进行了探讨。研究表明,马场金矿床金矿(化)体主要沿NW向断裂和裂隙分布,构造控矿明显,矿体主要由碎裂云母钠长石英片岩、石英脉及煌斑岩脉构成;赋矿围岩为海原群西华山组下岩段(Pt12x1),该岩段岩性主要为一套云母钠长石英片岩夹云母石英片岩;矿石类型以氧化矿石为主,多呈褐黄色及土黄色,块状、网脉状及蜂窝状构造,碎裂结构明显;围岩蚀变较弱,以黄铁矿化和褐铁矿化为主,各类蚀变或彼此叠加、或相互伴生,分带性不明显;成矿物质主要来源于海原群变质岩,但岩浆活动对金矿化的形成起了重要作用;矿床类型属与煌斑岩有关的中温热液矿床。
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| 关 键 词： | 马场金矿床 地质特征 矿床成因 西华山地区 宁夏 |
| 收稿时间： | 2022/4/27 0:00:00 |
Geological characteristics and genesis of Machang Au deposit in Xihuashan area, Ningxia |
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| YANG Kecheng,MU Caixi,HAI Lianfu,YAO Shiqi,MEI Chao,CHAI Deliang.Geological characteristics and genesis of Machang Au deposit in Xihuashan area, Ningxia[J].Contributions to Geology and Mineral Resources Research,2022,37(4):414-419. |
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| Authors: | YANG Kecheng MU Caixi HAI Lianfu YAO Shiqi MEI Chao CHAI Deliang |
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| Institution: | Geological Museum of Ningxia Hui Autonomous Region, Yinchuan 750011, China;Mineral Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, China;Institute of Mineral Geology of Ningxia Hui Autonomous Region, Yinchuan 750021, China |
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| Abstract: | Machang Au deposit is the largest one discovered now in Xihuashan area, Ningxia. This paper summarizes detaily geological characteristics and discusses genesis of the deposit. Au mineralization (ore bodies) mainly occur along NW faults and fractures showing structure-control characteristics. The ore bodies are composed of fractured mica-albite-quartz schist, quartz veins and lamprophyre dykes and are hosted by the lower member(Pt12x1) of Xihuashan formation of Haiyuan group. The member consists of the mica-albite-quartz schist intercalated with quartz schist. The brown and khaki oxidized ore is the dominant ore type with massive, network veinlet and honeycomb structure and evidently fragmentation texture. The wall rock alteration is weak and overprinted and co-existed including mainly pyritization and limonization without alteration zoning. The ore-forming materials come mainly from Haiyuan group. However magmatic activity plays an important role in formation of the deposit. Genetically the deposit is a lamporphyre-related Meso-thermal deposit. |
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| Keywords: | Au deposit geological characteristics genesis Xihuashan area Ningxia |
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