| 老挝华潘省香科菱镁矿地质特征与成因分析 |
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| 引用本文： | 张子军,奥琮,严城民,杨宇,郎维雄,洪鑫科,杜磊,李新仁.老挝华潘省香科菱镁矿地质特征与成因分析[J].吉林大学学报(地球科学版),2020,50(1):85-96. |
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| 作者姓名： | 张子军 奥琮 严城民 杨宇 郎维雄 洪鑫科 杜磊 李新仁 |
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| 作者单位： | 1. 云南省核工业二○九地质大队, 昆明 650032;2. 中国地质调查局天津地质调查中心, 天津 300170;3. 云南省地矿局区域地质矿产调查大队, 云南 玉溪 653100 |
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| 基金项目： | 云南省高新技术产业发展项目（201704）；境外商业性地质勘查项目（K20180512） |
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| 摘 要： | 经野外调研和室内研究，对老挝华潘省香科菱镁矿的矿区地质、矿体、围岩与夹石、矿石特征和矿床成因取得了一些新的认识。该矿区出露地层为下古生界（Pz1）、中-上石炭统（C2-3）和第四系河流二级阶地沉积（QpⅡal），主要构造为1条北西向逆断层和4条北东向平移断层。矿体产于逆断层南西侧的强烈构造变形带中，呈脉状产出，厚度为数mm至10余cm，共圈出10个矿体。矿体的围岩与夹石的岩石类型相同，为浅变质陆源碎屑岩，具高硅（w（SiO2）为81.190%）、低镁（w（MgO）为0.781%）、富铁（w（Fe2O3）为11.716%、w（FeO）为1.719%）特征。矿石矿物为菱镁矿，脉石矿物主要为石英、金云母、白云石、绢云母和褐铁矿。香科菱镁矿的形成过程是：在中-晚三叠世的古特提斯洋封闭过程中，镁质从超镁铁岩中析出形成含矿热液，含矿热液迁移与富集后在强烈构造变形带中形成网脉状菱镁矿。香科菱镁矿的成因类型属产于浅变质碎屑岩中之老挝香科式晶质菱镁矿热液型矿床，成矿时代属中-晚三叠世。
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| 关 键 词： | 香科菱镁矿 矿区地质 矿体特征 围岩与夹石 矿床成因 热液型矿床 老挝华潘省 |
| 收稿时间： | 2018-08-20 |
Geological Characteristics and Genetic Analysis of Xiengkhor Magnesite in Houaphanh Province,Laos |
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| Zhang Zijun,Ao Cong,Yan Chengmin,Yang Yu,Lang Weixiong,Hong Xinke,Du Lei,Li Xinren.Geological Characteristics and Genetic Analysis of Xiengkhor Magnesite in Houaphanh Province,Laos[J].Journal of Jilin Unviersity:Earth Science Edition,2020,50(1):85-96. |
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| Authors: | Zhang Zijun Ao Cong Yan Chengmin Yang Yu Lang Weixiong Hong Xinke Du Lei Li Xinren |
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| Institution: | 1. No. 209 Geological Party, Geological Bureau of Yunnan Nuclear Industry, Kunming 650032, China;2. Tianjin Center, China Geological Survey, Tianjin 300170, China;3. Yunnan Bureau of Geology and Mineral Resources Regional Geological and Mineral Investigation Brigade, Yuxi 653100, Yunnan, China |
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| Abstract: | Through a field research,some new understandings have been obtained on the geology,ore body characteristics,surrounding rocks and rocks,ore characteristics, and mineral genesis of the Xiengkhor magnesite in Houaphanh Province,Laos. The exposed strata in the mining area are Lower Paleozoic (Pz1),Middle Carboniferous-Upper Carboniferous(C2-3),and Quaternary river secondary terrace deposits (QpⅡal). The main structure is a northwestward reverse fault and four northeast shift faults. The ore bodies are produced in the strong tectonic deformation zone on the southwest side of the reverse fault, and they are vein-like with the thickness of several millimeters,several centimeters, or ten centimeters. A total of ten ore bodies are circled. The surrounding rock of the ore body is the same as the rock type included in the ore body. It is a shallow metamorphic terrigenous clastic rock with high silicon(SiO2=81.190%),low magnesium(MgO=0.781%),and rich iron (Fe2O3=11.716%,FeO=1.719%). The ore mineral is magnesite,and the gangue minerals are mainly quartz,phlogopite,dolomite,sericite, and limonite. It is inferred that the Xiengkhor magnesite was formed during the closure of the Middle Triassic-Late Triassic Paleo-Tethys ocean:The magnesia precipitated from the ultramafic rocks and formed the ore-bearing hydrothermal fluid; after enrichment,reticular magnesite was formed in the strong tectonic deformation zone. The genetic type of the Xiengkhor magnesite belongs to the Laoxieng-type crystalline magnesite hydrothermal deposit in shallow metamorphic clastic rocks. The metallogenic age is in Middle Triassic-Late Triassic. |
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| Keywords: | Xiengkhor magnesite mining area geology ore body characteristics surrounding rock and stone deposit genesis hydrothermal deposit Houaphanh Province Laos |
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