摘要
赣东北横峰县港边岩浆混合杂岩体组成极为复杂,具有明显的岩浆混合特点,偏酸性岩浆端员、基性岩浆端员、岩浆混合单位等在野外均能见及。该岩浆混合杂岩体中偏酸性端员肉红色角闪石石英正长岩中颗粒级锆石U Pb定年结果表明,其形成时代为445±4Ma,反映为加里东期产物;同时获得的残留锆石U Pb年龄值2958±62Ma,说明该岩浆混合杂岩体中存在中太古代残留锆石,该年龄值也是目前已知的江西省境内最老的残留锆石U Pb年龄值。
Composition of the magma-mixed complex in Gangbian of Hengfeng, northeast Jiangxi Province is very complicated. It includes near-acid, basic and mixing magmatic end-members, with clear characteristics of magmatic mixing. The single zircon U-Pb age of the pinkish-color hornblende quartz syenites from the near-acid magmatic end-member is 445±4Ma, indicating that these rocks are Caledonian. The syenites yields an age of 2 958±62Ma based on the U-Pb zircon concordia upper intercept. This old age suggests the existence of Meso-Archean inherited zircons in the magma-mixed complex, and is the oldest U-Pb age for inherited zircons in Jiangxi Province.
出处
《资源调查与环境》
2004年第3期174-177,共4页
Resources Survey & Environment
基金
1:25万景德镇市幅上饶市幅南昌市幅区域地质调查项目(编号:200013000109)资助。
