地质通报2016，Vol.35Issue(6)：989-997,9.
粤东北仁差盆地早侏罗世花岗岩基底LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb age of Early Jurassic granite basement in Rencha Volca-nic Basin and its geological significance
摘要
Abstract
Rencha basin is one of the typical Mesozoic-Cenozoic volcanic fault basins in northeast Guangdong. Drilling exploration reveals that its basement is mainly composed of Paleozoic metamorphic rocks and graphic granite. In order to further investigate the formation age of the basement rock masses and to improve the knowledge of geological evolution of the area, the authors conducted isotope dating of the samples of graphic granite basement from two drill holes in the basin. The 206Pb/238U measured ages of two groups of zircon by LA-ICP-MS are respectively 179 ± 1Ma and 186Ma, suggesting that the formation age of the graphic granite basement of Rencha Volcanic Basin is late Early Jurassic, i.e., Rencha Basin was formed at the first episode of the Yanshanian mag⁃matic activity. These ages not only deepen the understanding of the formation and evolution of the Rencha Basin but also provide new chronologic data for the report that northeast Guangdong was lack of magmatic activity in Early Jurassic.关键词
仁差盆地/基底花岗岩/LA-ICP-MS锆石U-Pb年龄/早侏罗世Key words
Rencha Volcanic Basin/Basal granite/LA-ICP-MS zircon U-Pb dating/Early Jurassic分类
天文与地球科学引用本文复制引用
汤谨晖,娄峰,甘炳艳,黄文生..粤东北仁差盆地早侏罗世花岗岩基底LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2016,35(6):989-997,9.基金项目
中央地质勘查基金项目 （）
