摘要
南岭成矿带中段湘南地区广泛出露中酸性岩浆岩,具有面积广、规模大、成矿独特等特征。岩体周缘多分布世界级的超大型‒大型钨锡铅锌矿床等,因其特有的成矿作用使之成为国内外研究华南陆内成矿作用的典范。在大量收集该区成矿花岗岩岩石学数据、成岩‒成矿年代学、同位素地球化学等数据的基础上,对比研究了湘南多金属矿集区多矿床成矿岩体主量、微量、稀土元素、Sr-Nd-Hf同位素、成岩成矿年代学和稳定同位素组成特征,分析探讨了该区成岩成矿作用、成矿专属性、成矿物源和动力学背景等。结果表明:岩体的主微量元素特征指示湘南花岗岩类型复杂且均有明显的成矿专属性,多金属成矿作用与花岗岩具有密切的时空关系,成岩时代的峰值介于240~230 Ma(印支期)和160~150 Ma(燕山期)两个区间,多金属成矿高峰期为燕山早中期;稳定同位素组成指示成矿物质主要来源于岩浆,后期受地层和大气降水的混染作用明显。Sr-Nd-Hf同位素显示该区花岗岩的源区以壳源为主,兼有少量幔源混合的特征。综合研究认为,今后需进一步深化多金属复合成矿机理、岩浆演化、构造系统与岩浆热液成矿系统的联合控矿机理等方面的深入研究,揭示成岩成矿构造的深延格局,为深部找矿预测奠定基础。
The medium-acidic igneous rocks are widely exposed in the southern Hunan province,in the middle part of the Nanling metallogenic belt,and commonly associated with large scale and distinctive ore mineralization.There are many world-class ultra-large to large Cu-W-Sn-Pb-Zn deposits occurring around the intrusions.Because of the unique ore mineral resources,the Indosinian-Yanshanian granites and associated ore deposits in the region have been focus of many reseaches.In this paper,we compile a large dataset of petrological,chronological,and geochemical results of the ore-related granites and the polymetallic deposits.The major and trace elements,Sr-Nd-Hf isotopes,ages and stable isotope compositions of the ore-related granites and the ores of the polymetallic deposits in the southern Hunan polymetallic ore concentration area are compiled and analyzed.The results show that the types of granites in Southern Hunan are complex and have obvious metallogenic specificity.The overall polymetallic mineralization is closely related to granites in time and space.The peak ages of granite magmatism are 240 Ma to 230 Ma(Indosinian)and 160 Ma to 150 Ma(Yanshanian).But the peak period of polymetallic mineralization is the early to middle Yanshanian.Stable isotope compositions indicates that the ore-forming materials are mainly derived from magmas,and are obviously contaminated by the sedimentary rocks and atmospheric precipitation in the later stage.The Sr-Nd-Hf isotope data show that the granite magmas were mainly derived from the crust,with a small amount of mantle source mixing.The comprehensive study suggests that it is necessary to further deepen the in-depth study of polymetallic composite metallogenic mechanism,magmatic evolution,and ore-controlling mechanism of tectonic system and magmatic hydrothermal metallogenic system.
作者
赵冻
韩润生
刘飞
付雨昕
张小培
邱文龙
ZHAO Dong;HAN Runshen;LIU Fei;FU Yuxin;ZHANG Xiaopei;QIU Wenlong(Faculty of Land Resource Engineering,Kunming University of Science and Technology/South-West Institute of Geological Survey,Geological Survey Center for Nonferrous Metals Resources,Kunming 650093,Yunnan,China;Kunming Geological Prospecting Institute,China Metallurgical Geological Bureau,Kunming 650024,Yunnan,China;Yuxi Normal University,Yuxi 653100,Yunnan,China)
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2023年第2期337-360,共24页
Geotectonica et Metallogenia
基金
国家重点研发计划项目(2018YFC0603902)
云岭学者(2014)
云南省矿产资源预测与评价工程实验室(2012)
昆明理工大学地质过程与矿产资源省创新团队与云南省高校和昆明理工大学成矿动力学与隐伏矿预测创新团队联合资助。
关键词
花岗岩
岩浆热液矿床
成岩成矿作用
湘南多金属矿集区
granite
magma hydrothermal type deposit
diagenesis and mineralization
Southern Hunan polymetallic ore concentration area
