摘要
为探究黑龙江省东部海音山林场地区二长花岗岩的形成时代和地质意义,对细粒二长花岗岩开展锆石阴极发光图像和U-Pb年代学研究。结果表明,锆石形态以自形、半自形为主,主要呈粒状和柱状,韵律环带结构明显。锆石具有较高含量的U(299×10^(-6)～813×10^(-6))和Th(56×10^(-6)～351×10^(-6))值,Th/U值为0. 06～0. 55,均值为0. 35。加权平均年龄为120±1 Ma,属于早白垩世。海音山林场地区二长花岗岩形成于活动大陆边缘环境。该结果为海音山林场地区内岩浆岩的锆石年代学研究提供了参考。
This paper describes a new research into cathodoluminescence images of zircons and zircon U-Pb dating of the fine-grained monzonitic granites occurring in Haiyinshan Forest Farm,in Heilongjiang Province,with the aim of constraining its formation age and geodynamic significance.The results show that zircon exhibits euhedral-subhedral morphology,mainly in the granular and columnar form,and an obvious oscillatory-zoning characteristics;the zircon has a higher content of U(299×10^-6-813×10^-6)value,Th(56×10^-6-351×10^-6)value,and Th/U value of 0.06-0.55,with average value of 0.35,and the weighted average age of 120±1 Ma,suggesting that the monzogranite was formed in the Early Cretaceous.The study concludes that the monzo granite present in Haiyinshan Forest Farm was formed in the active continental marginal environment.The results could serve as a reference for investigating zircon geochronology of magmatic rocks in Haiyinshan Forest Farm area.
作者
王键
岳洪举
Wang Jian;Yue Hongju(School of Mining Engineering,Heilongjiang University of Science & Technology,Harbin 150022,China;No.701 Team,Institute of Geological Exploration of Nonferrous Metals of Heilongjiang Province,Harbin 150028,China)
出处
《黑龙江科技大学学报》
CAS
2019年第1期11-14,28,共5页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省省属本科高校基本科研业务费项目(Hkdcx201805)
