河南省泌阳县付金川金红石矿床成矿时代及成因探讨  

Discussion on metallogenic age and genesis of Fujinchuan rutile deposit in Biyang County,Henan Province

作　　者：王莉 张荣臻 杜保峰 李栋 茹朋 耿爱宾 袁稳 吕国营 WANG Li;ZHANG Rongzhen;DU Baofeng;LI Dong;RU peng;GENG Aibin;YUAN Wen;LYU Guoying(Henan Academy of Geology,Zhengzhou 450016,Henan,China;Henan Key Laboratory of Metal Mineral Mineralization Geological Processes and Resource Utilization,Zhengzhou 450016,Henan,China)

机构地区：[1]河南省地质研究院,河南郑州450016 [2]河南省金属矿产成矿地质过程与资源利用重点实验室,河南郑州450016

出　　处：《矿产勘查》2024年第12期2187-2197,共11页Mineral Exploration

基　　金：河南省财政地质勘查项目(豫自然资源函〔2024〕402号);河南省地质研究院基本科研费项目(2024-903-XM01、04、06和07)联合资助。

摘　　要：金红石是最具有经济价值的钛矿物,在军工航空、航天、航海、机械、化工、海水淡化、造纸、陶瓷等方面具有重要用途。金红石是自然界中较为稳定的矿物之一,在热液活动和角闪岩相变质级以下均能保持其化学稳定性,是研究变质作用和流体活动的理想矿物。为了研究秦岭—大别地区变质型金红石矿床的成因及年代特征,本文选取泌阳县付金川金红石矿床为研究对象,通过LA-ICP-MS金红石U-Pb测年及矿物微区测试进行系统研究。结果发现付金川矿床中的含钛矿物以金红石为主,TiO_(2)含量为95.6%~98.5%。LA-ICP-MS金红石U-Pb年代学获得加权平均年龄(283±26)Ma,暗示泌阳地区可能存在二叠纪的金红石成矿时间;Nb含量均大于Zr含量(Nb/Cr为1.76~42.88),且Nb>800×10^(-6),表明付金川矿床中的金红石形成于变泥质岩,而非变镁铁质岩,属于壳幔混合来源。Rutile is the most ecnomically valuable mineral containing titanium.It has important applications in military aviation,aerospace,navigation,machinery,chemical industry,seawater desalination,paper making,ceramics and so on.Rutile is one of the relatively stable minerals in nature,which can maintain its chemical stability below hydrothermal activity and amphibole facies metamorphism,and is an ideal mineral for studying metamorphism and fluid activity.In order to study the genesis and chronological characteristics of metamorphic rutile deposits in Qinling-Dabie area,In this paper,LA-ICP-MS rutile U-Pb dating and mineral micro-area testing are used to systematically study the rutile deposit in Fujinchuan,Biyang County.The results show that rutile is the main titanium-bearing mineral in Fujinchuan deposit.Rutile has high purity,with TiO_(2) content ranging from 95.6%to 98.5%.The LA-ICP-MS rutile U-Pb geochronology determined that the mineralization age of the rutile deposit in the FuJinchuan area is(283±26)Ma,suggesting the possible existence of a Permian rutile mineralization period in the Biyang area.The Nb content is higher than Zr content(Nb/Zr ranging from 1.76 to 42.88),and Nb>800×10^(-6),indicating that the rutile in the Fujinchuan deposit was formed in metamorphic mudstone rather than metamorphic mafic rock.Rutile in Fujinchuan deposit belongs to metamorphic origin and may belong to mixed source of crust and mantle.

关 键 词：金红石 LA-ICP-MS 金红石U-Pb年龄 付金川 泌阳县 

分 类 号：P611.3[天文地球—矿床学]