首页|太行山中段九岭金矿区脉岩锆石成因矿物学研究

太行山中段九岭金矿区脉岩锆石成因矿物学研究

Genetic mineralogical study of zircons in dikes in the Jiuling gold deposit of the central Taihang Mountains

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位于太行山中段的九岭金矿是一典型的石英脉型金矿,其金矿脉与酸性脉岩有密切的时空联系.本文对九岭金矿区内的花岗斑岩和花岗闪长岩脉进行了系统的锆石U-Pb年代学、Hf同位素和成因矿物学研究.结果表明,脉岩的侵位年龄为128～130 Ma,成岩物质主要来自于太古代地壳,另有少量幔源物质.锆石的形态标型特征指示区内岩浆经历了较长的分异演化过程,这与其具有较高的含水量有关.花岗斑岩岩浆演化过程可以分为3个阶段,随着温度的降低岩浆由过碱性向过铝质转变.花岗闪长岩中的锆石根据环带结构特征可明显分为两个群,其演化特征表明为过铝质和过碱质岩浆混合的产物.锆石温度计和氧逸度计计算结果表明九岭金矿区脉岩岩浆氧逸度高达ΔFMQ+5～ΔFMQ+7,对金的活化迁移及富集成矿十分有利.
The Jiuling gold deposit located in central section of the Taihang Mountains is a typical quartz-vein type gold deposit,and its auriferous quartz veins are closely related to acidic dikes in time and space.In this study,we have conducted systematically the zircon U-Pb chronology and zircon Hf isotopes,and genetic mineralogy of granite porphyry and granodiorite dikes in the Jiuling gold deposit.The results show that the emplacement ages of dikes are 128～130 Ma,and the magmatic materials of dikes were sourced mainly from the Archean crust and partly from the mantle.The morphological and typological characteristics of zircons indicate that the magmas of dikes in this area had undergone relatively long processes of differentiation and evolution,which are related to their high water contents.The evolution process of granite porphyry magma can be divided into three stages,and its magma property was transitioned from a peralkaline one to a peraluminous one with the decrease of temperature.The zircons in the granodiorite can be clearly classified into two groups based on their zoning textures.Their evolutionary characteristics indicate that they were products of a mixture of peraluminous and peralkaline magmas.The calculation results of thermometer and oxybarometer of zircons indicate that the oxygen fugacities of the magmas in the Jiuling gold deposit were as high as ΔFMQ+5～ΔFMQ+7,which are very beneficial for the activation,migration,enrichment,and mineralization of gold.

zircongenetic mineralogypetrogenesismagmatic evolutioncentral section of the Taihang Mountains

张聚全、陈超、卢静、张福祥、郭海全、张桐、张才龙、范启超、邢欢

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河北省地质矿产勘查开发局 博士后科研工作站,石家庄 050051

河北地质大学 地球科学学院,石家庄 050031

河北省地质矿产勘查开发局,石家庄 050051

河北省地质矿产勘查开发局 第六地质大队,石家庄 050051

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锆石 成因矿物学 岩石成因 岩浆演化 太行山中段

河北省地质矿产勘查开发局博士后项目河北地质矿产勘查开发局科研项目河北科技厅重点研发项目河北省自然科学基金

13000023P00F66410003713000022P00329410103R22374201DD2021403028

2024

10.3724/j.issn.1007-2802.20240011

矿物岩石地球化学通报
中国矿物岩石地球化学学会 中国科学院地球化学研究所

矿物岩石地球化学通报

CSTPCD北大核心
影响因子：0.912
ISSN：1007-2802
年,卷(期)：2024.43(2)
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