河北张三营富铌碱长花岗岩和花岗斑岩锆石U-Pb年代学及其地质意义  

Zircon U-Pb dating of Zhangsanying Nb-enriched alkali feldspar granite and granite porphyry,Hebei Province,and its geological implications

作　　者：杨瑞 王鹏 孙志辉 胡华斌 魏浩 段站站 李亮 YANG Rui;WANG Peng;SUN ZhiHui;HU HuaBin;WEI Hao;DUAN ZhanZhan;LI Liang(1514 Brigade of North China Geological Exploration Bureau,Chengde 067000,Hebei,China;Hebei Key Laboratory of Strategic Critical Mineral Resources,Hebei GEO University,Shijiazhuang 050031,Hebei,China)

机构地区：[1]华北地质勘查局五一四地质大队,河北承德067000 [2]河北省战略性关键矿产资源重点实验室河北地质大学,河北石家庄050031

出　　处：《矿床地质》2021年第4期740-752,共13页Mineral Deposits

基　　金：国家重点研发计划项目(编号:2019YFC0605202);国家自然科学基金项目(编号:41902060);河北省自然科学基金项目(编号:D2020403103、D2020403019);河北省高等学校科学技术研究项目(编号:BJ2019015、ZD2020134);河北地质大学博士基金项目(编号:BQ2017017)联合资助。

摘　　要：张三营富铌碱长花岗岩位于华北克拉通北缘中段,文章对该花岗岩和与其伴生的花岗斑岩进行锆石LA-ICP-MSU-Pb定年研究,结果表明富铌碱长花岗岩可能是岩浆多期次聚集作用下形成,结晶年龄约为141 Ma,其晚期分异形成的花岗斑岩均形成于132~124 Ma;张三营富铌碱长花岗岩是早白垩世古太平洋板块俯冲折返作用相关的伸展体制下形成的。研究揭示,除海西期和印支期外,燕山晚期也是华北克拉通北缘铌钽成矿的重要时期,燕山晚期的碱性岩和过铝质花岗岩将成为本区稀有金属找矿的新方向。The Zhangsanying Nb-enriched alkali granite is located in the middle part of the northern margin of the North China Craton.In this study,we present new zircon U-Pb data of Nb-enriched alkali granite and granite por-phyry.The results show that multistage magma accumulation might result in the formation of the Nb-enriched al-kali granite.Its crystallization age is about 141 Ma and its formation age,together with the granite porphyry,is 132~124 Ma.The alkali granite formed in Early Cretaceous,within an extensional setting during the period of the Paleo-Pacific Plate subduction and subsequent inversion.In addition to Hercynian and Indosinian,Late Yansha-nian is an important metallogenic period in the northern margin of the North China Craton Nb-Ta belt.This area has significant potential for Nb-Ta mineralization.Late Yanshanian alkaline rock and peraluminous granite should be focus of future exploration.

关 键 词：地球化学 锆石U-PB定年 碱长花岗岩 花岗斑岩 稀有金属成矿 张三营 华北克拉通北缘 

分 类 号：P618.6[天文地球—矿床学]