浙江天台盆地下陈萤石矿床地质特征及 ESR 年代学

摘要

探讨浙江天台盆地下陈萤石矿床的矿床地质特征与成矿时代，为寻找成因类似的矿床提供理论依据。通过该矿床的野外地质特征和岩矿石显微镜下特征的研究，并利用热活化电子自旋共振测龄法对矿区内不同矿脉上与萤石共生的石英进行了测定，结果表明下陈萤石矿床为热液充填型脉状萤石矿床，成矿年龄平均为75．3±7．0 Ma，其成矿时代主要为晚白垩世。对浙江不同地区萤石矿床成矿时代的规律进行总结，显示浙江的萤石矿成矿时代呈现多期次性，在早白垩世早期、早白垩世晚期、晚白垩世均有成矿作用发生，主要集中在晚白垩世。%Through the researches on the field geological characteristics of the Xiachen fluorite deposit and the ore microscopic characteristics and using the activation of electron spin resonance (ESR) dating method,this paper discusses the ore-forming geological characteristics and the quartz ESR age of the fluorite deposit in Xiachen,Zhejiang,China.The results show that this fluorite deposit is a hydrothermal filling type vein fluorite deposit.Its average metallogenic age is 75.3 ±7.0 Ma.The metallogenic epoch of this ore deposit is mainly late Cretaceous.The summarization of the law of the fluorite deposits metallogenic epoch in different areas shows that the metallogenic epoch of the fluorite deposits presents multiphases in Zhejiang. Mineralization occurred in the early period of early Cretaceous,the late period of early Cretaceous,and late Cretaceous,but mainly occurred in late Cretaceous.