河北省花市铷矿床麻地岩体中锆石特征及其年代学意义  

Zircon characteristics and its geochronological significance of Madi intrusion in Huashi Rb deposit,Hebei

作　　者：齐云飞[1] 苗群峰 孙金龙[1] 李智斌[1] 刘海波[1] QI Yunfei;MIAO Qunfeng;SUN Jinlong;LI Zhibin;LIU Haibo(th Geological Brigade of Hebei Geology and Mineral Resources Exploration Bureau,Qinhuangdao Hebei 066000,China)

机构地区：[1]河北省地矿局第八地质大队,河北秦皇岛066000

出　　处：《有色金属（矿山部分）》2021年第4期87-91,共5页NONFERROUS METALS(Mining Section）

基　　金：河北省地质矿产勘查开发局基金项目(454-0502-YBN-GFYR;454-0401-YBN-M208)。

摘　　要：麻地岩体作为河北省稀有金属矿化花岗岩之一,具有很好的稀有金属矿找矿前景。初步总结了麻地岩体中锆石形态学、主微量元素、Th/U比值等基本特征,探讨了其年代学意义,结合以往研究成果,认为燕山期中晚侏罗世是冀东马兰峪复式背斜一带花岗岩型稀有金属矿化的重要成矿期;燕山晚期中酸性侵入体呈小岩株产出,具高分异和明显富集Th、U、Ta、Nb、Rb、Y等不相容元素的特征,岩体中锆石的Th、U元素含量高,锆石稀土元素配分曲线呈现海鸥状,具明显的四分组效应时,其形成花岗岩型稀有金属矿的潜力较大。Madi intrusion is the type of rare-metal granite in Hebei,which would be promising for prospecting rare-metal deposits.This paper preliminarily summarized the basic characteristics of zircon morphology,main and trace elements,Th/U ratio,and explored its chronological significance.According to the previous research results,it is suggested that Middle-Late Jurassic of Yanshanian is an important metallogenic period of granite type rare-metal mineralization in the area of Malanyu compound anticline in eastern Hebei.The Late Yanshanian granite intrusions occurred as small stocks would have great potentials for the granite type rare-metal deposit if they are enriched in incompatible metals such as Th,U,Ta,Nb,Rb and Y,and with high fractionation,while the zircon with high content of Th,U and the rare earth elements of zircon are seagull-shaped,with obvious quartet effect.

关 键 词：麻地岩体 锆石 年代学 地质意义 

分 类 号：P588.1[天文地球—岩石学]