| 吴波,刘应忠,蒋良兵,邓明秋,徐安全.云南镇雄县安家坝富铁豆鲕状赤铁矿的发现及找矿意义[J].贵州地质,2017,34(2):71-76 |
| 云南镇雄县安家坝富铁豆鲕状赤铁矿的发现及找矿意义 |
| Discovery and Its Significance of High Iron Oollth Hematite in Anjiabao of Zhenxiong，Yunnan |
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| DOI： |
| 中文关键词: 富铁豆鲕状赤铁矿 梁山组 镇雄县安家坝 成因 找矿意义 |
| 英文关键词:High iron oolith hematite Liangshan formation Anjiaba,Zhenxiong Genesis Significance |
| 基金项目:中国地质科学院“西南岩溶区1∶5万地质填图试点”（DD20160061） |
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| 中文摘要: |
| 通过野外调查，在云南镇雄县安家坝发现富铁豆鲕状赤铁矿体。矿体呈透镜状、似层状产出于梁山组上部，矿体产状与地层产状基本一致。通过少量剥土工程初步控制，矿体走向呈南西—北东向，倾向上延伸不明。致密状赤铁矿品位低，不具工业规模，豆鲕状赤铁矿平均品位3409%，厚度4 m以上，达到赤铁矿最低工业指标要求。镜下显示，豆鲕状赤铁矿样品由鲕豆粒、陆源碎屑及填隙物等构成，鲕豆粒成分占40%以上，分布均匀，成分由粘土矿物构成，具弱褐铁矿化现象。研究认为，本区鲕状赤铁矿的形成经历了叠生成矿作用，原生沉积的铁质石英砂岩，经表生氧化和风化淋滤叠生成矿作用形成原生沉积+风化淋滤叠生赤铁矿床。 |
| 英文摘要: |
| By field investigation, the high iron oolith hematite is found in Anjiaba, Yunnan. The orebody occur in upper Liangshan formation as lentoid and stratiform, the occurrence basically consistent with the strata. By little capping engineer primary control, the orebody trend is SW-NE, but the extension is unknown. The grade of massive hematite is low and can’t meet the industrial scale, the average grade of oolith hematite is 34.09%, the thickness is more than 4m and meet the lowest industrial scale. Under the microscope, oolith hematite is consist of oolith grain, continental fragment and interstitial material. Oolith grain is more than 40%, distributes uniform, consist of clay mineral and has the phenomena of weak ferritization. In this study, it’s thought the oolith hematite formation in this area experienced telescoping, the original sedimentary ferreous quartz sandstone formed original sediment-weather leaching superposed hematite deposit by superficial oxidation and weather leaching mineralization. This discovery will afford valuable clue for hematite exploration of Liangshan formation in this area. |
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