地质通报2011，Vol.30Issue(7)：1043-1049,7.
西藏那曲南部早白垩世闪长玢岩LA-ICP-MS锆石U-Pb年龄
Zircon LA-ICP-MS U-Pb age of Early Cretaceous ignimbrite in southern Nagqu, Tibet
摘要
Abstract
In northern Gangdise belt, Middle Triassic, Middle-Late Jurassic and Late Cretaceous magmatic activities exist, but Early Cretaceous magmatic activity was rarely reported. The authors sampled and analyzed systematically andesite porphyrite from Luoma area of Nagqu, Tibet. Two of the samples were dated by LA-ICP-MS zircon U-Pb dating, and their ages are 116.1 ±0.4Ma and 115.9±0.5Ma respectively. These ages are almost consistent with each other within the acceptable error range, thus representing the formation age. The authors hold that the Early Cretaceous magmatic activity did exist in northern Gangdise belt, which is of great significance in the study of the Early Cretaceous geological evolution.关键词
LA-ICP-MS锆石U-Pb年龄/闪长玢岩/冈底斯/嘎加组Key words
zircon LA-ICP-MS U-Pb age/ diorite porphyrite/ Gangdise/ Gajia Formation分类
天文与地球科学引用本文复制引用
刘伟,李奋其,袁四化,张万平,王保弟,卓皆文,陈璐,陈莉..西藏那曲南部早白垩世闪长玢岩LA-ICP-MS锆石U-Pb年龄[J].地质通报,2011,30(7):1043-1049,7.基金项目
中国地质调查局国土资源地质大调查项目青藏专项《雅鲁藏布江成矿带基础地质综合研究》(编号:1212010818016) （编号:1212010818016）
