冀东马兰峪地区花岗闪长岩中巨晶锆石成因分析  

Genesis study on the megacrystal zircons of the granodiorite in the Malanyu area,eastern Hebei province

作　　者：刘政国 王树志 郑旭阳 孙万里 乔嘉曦 LIU Zhengguo;WANG Shuzhi;ZHENG Xuyang;SUN Wanli;QIAO Jiaxi(North China University of Science and Technology in Hebei Province, Tangshan 063210, Hebei, China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]华北理工大学,河北唐山063210

出　　处：《地质找矿论丛》2020年第4期433-440,共8页Contributions to Geology and Mineral Resources Research

基　　金：河北省自然科学基金项目“冀东马兰峪地区腰岭子花岗闪长岩巨晶锆石成因研究”(编号:D2019209531);华北理工大学大学生创新创业训练计划项目(编号:X2019212)联合资助。

摘　　要：巨晶锆石由于稳定性强,能够很好地保存其形成时的标型和化学特征而成为最重要的矿物地球化学探针之一。本文在通过对冀东马兰峪腰岭子花岗闪长岩中锆石矿物进行阴极射线致发光(CL)图像分析、晶体形态学统计学分析的基础上,结合等离子质谱(LA-ICP-MS)测试工作,解析了马兰峪金矿花岗闪长岩中巨晶锆石的微量元素组成特征,并依据Pupin等(1980)提出的锆石类型分类的主型和亚型及其地质温度表,研究结果表明:巨晶锆石的形成温度650~850℃,巨晶锆石的LA-ICP-MS分析显示Ce正异常和不明显Eu的负异常,并且富集重稀土元素;巨晶锆石可能与区内峪耳崖式金矿存在成因联系。Megacrystal zircon is one of the most important geochemical probes for mineral genetic study because of its high stability as well as the ability to preserve the forming typomorphic and chemical characteristics.The megacrystal zircons of the Yaolingzi granodiorite in the Mayanlu area in eastern Hebei province were analyzed by cathodoluminescence image,statistical crystal morphology and LA-ICP-MS.The results and the geothermometer of research of Pupin(1980)indicate that the egacrytal zircon was formed at 650℃-850℃.LA-ICP-MS analysis shows positive Ce anomaly,little negative Eu anomaly and enrichment heavy REE of the zircon.It may be genetically related to Yu’erya gold deposit in the study area.

关 键 词：腰岭子花岗闪长岩 巨晶锆石 形成温度 微量元素 成矿作用 马兰峪地区 冀东 

分 类 号：P571[天文地球—矿物学]