目的确定秦皇岛柳江盆地基底混合岩的年龄。方法在锆石阴极荧光内部结构研究的基础上,进行LA-ICP-MS锆石原位U-Pb定年。结果获得柳江盆地基底混合岩化作用发生的年代为2570-2 560 Ma。结论冀东地区华北地台的基底在2 560 Ma的晚太古代已经发育成熟。
Aim To date the magmatitic granite in Liujiang basin, Qinhuangdao area. Methods Combined study of Cathodoluminescence(CL) imaging and LA-ICP-MS in situ U-Pb dating on zircon grains from the magmatitic granite and dark relict. Results Magmatization process of the basement rocks in Liujiang basin occurred during 2 560 -2 570 Ma. Conclusion Basement of the North China platform craton in eastern Hebei province becomes mature from 2 560 Ma in Neoarchean.