文献类型：期刊文献

中文题名：黔西水城区立火锰矿床成因的地质地球化学约束

英文题名：Geological and Geochemical Constraints on the Genesis of the Lihuo Manganese Deposit in Shuicheng District,Western Guizhou Province

作者：程玛莉 刘坤 张俊杰

第一作者：程玛莉

机构：[1]贵州理工学院,贵州贵阳550025

第一机构：贵州理工学院

年份：2024

卷号：60

期号：5

起止页码：882-899

中文期刊名：地质与勘探

外文期刊名：Geology and Exploration

收录：CSTPCD;;北大核心:【北大核心2023】；CSCD:【CSCD_E2023_2024】；

基金：黔科合基础项目“贵州二叠系锰矿控矿因素及成因研究(编号:[2016]1404)”、“地幔柱活动对贵州二叠系锰成矿作用影响(编号:[2020]1Y160)”、黔教合资金项目“遵义地区锰成矿作用与“硅质岩”关系研究(编号:KY字[2018]224)”和贵州理工学院高层次人才启动经费项目“晚二叠世构造事件对水城-遵义成锰作用的约束(编号:XJGC20190612)”联合资助。

语种：中文

中文关键词：地球化学;热水成因;沉积环境;沉淀方式;立火锰矿;水城区;贵州省

外文关键词：geochemistry;hydrothermal origin;sedimentary environment;precipitation pattern;Lihuo manganese deposit;Shuicheng District;Guizhou Province

摘要：二叠纪是华南地区重要的锰富集成矿期。本文以贵州省西部水城区立火锰矿含锰岩系为研究对象,分析影响贵州二叠纪成锰作用的岩相古地理,讨论锰质来源及成因、沉积环境及锰沉淀方式。采用光学显微镜、XRF、XRD和ICP-MS对水城立火锰矿含锰岩系、顶板及底板进行矿物组成、主量、微量及稀土元素分析测试。结果表明,该矿床含锰岩系形成于伸展拉张的台地内部裂陷盆地,锰矿石中见重晶石、石膏、天青石、菱锰矿及菱铁矿等热水沉积矿物,发育热水沉积典型纹层状构造及火山活动长石斑晶硅质交代结构,富含Fe、Mn、Co、Ni、V、Mo等热水沉积元素,具有显著Ce/Ce^(*)负异常稀土配分模式。Mn/Fe、SiO_(2)/Al_(2)O_(3)、Al_(2)O_(3)/TiO_(2)、Co/Ni、Co/Zn、Y/Ho比值及Fe-Mn-(Cu+Co+Ni)×10、Co-Ni-Zn、Co/Zn vs.(Cu+Co+Ni)、LogU/LogTh及Fe/Ti vs.Al/(Al+Fe+Mn)地球化学图解显示水城立火锰矿是热水沉积成因;V/Cr、V/(V+Ni)及Ce_(anom)特征值指示该锰矿床形成于氧化-弱氧化-弱还原海相沉积环境。综合地质、地球化学特征,该矿床锰成矿作用经历了铁锰氧化物(氢氧化物)初始沉淀及铁锰氧化物(氢氧化物)相转化为菱锰矿相的地质演化过程。
The Permian is an important period of manganese enrichment in South China.This article takes the manganese-bearing rock series of the Lihuo manganese deposit in Shuicheng District,western Guizhou Province as the research object,attempting to analyze the lithofacies and paleogeography that controlled the Permian manganese formation in Guizhou,and to discuss the sources and genesis of manganese,sedimentary environment,and manganese precipitation methods.Optical microscopy,XRF,XRD,and ICP-MS were utilized to analyze and test the mineral composition,major,trace,and rare earth elements of the manganese-bearing rock series,roof,and floor of the Lihuo manganese deposit in Shuicheng District.The results indicate that the manganese-bearing rock series was formed in the internal rift basin of the extensional platform.Hot water sedimentary minerals such as barite,gypsum,celestite,rhodochrosite,and siderite were discovered in the manganese ores,and typical layered structures of hot water sedimentary and siliceous metasomatic texture of feldspar phenocry stallographic caused by volcanic activity were developed.They are rich in hot water sedimentary elements such as Fe,Mn,Co,Ni,V,and Mo,and have a significant negative Ce/Ce^(*)anomaly of rare earth distribution pattern.The geochemical diagrams of Mn/Fe,SiO_(2)/Al_(2)O_(3),Al_(2)O_(3)/TiO_(2),Co/Ni,Co/Zn,Y/Ho values,and Fe-Mn-(Cu+Co+Ni)×10,Co Ni Zn,Co/Zn vs.(Cu+Co+Ni),LogU/LogTh,and Fe/Ti vs.Al/(Al+Fe+Mn)show the hydrothermal sedimentary origin of the Lihuo manganese deposit in Shuicheng District.The V/Cr,V/(V+Ni),and Ce_(anom)characteristic values indicate that the manganese deposit was formed in an oxidizing,weakly oxidizing to weakly reducing marine sedimentary environment.Based on comprehensive geological and geochemical characteristics,the manganese mineralization has undergone geological evolution process of initial precipitation of iron manganese oxides(hydroxides)and transformation of iron manganese oxide(hydroxides)phases into rhodochrosite phases.