地质通报2013，Vol.32Issue(2)：287-296,10.
内蒙古狼山西南地区枕状玄武岩LA-ICP-MS锆石U-Pb年龄及意义
LA-ICP-MS U-Pb ages of pillow lava basalts in southwestern Langshan, Inner Mongolia and their implication
摘要
Abstract
Recent found pillow lava basalts in the southwestern Langshan and its preliminary dating has been reported here. Previous survey had assigned its age at the Early Paleozoic. 32 zircons from pillow lava basalts have been dated using LA-ICP-MS. Most zircons from basalts are captured from the basement, the distribution of ages and internal structures of which are complicated. Four groups of zircons have been distinguished by their internal structures. Among them the tabular zircons have been believed as the autogenetic zircons of pillow lava basalts, the ages of these zircons range from the end of Permian to the Early Triassic. The rest zircons in the samples are all from the Alashan basement, among which Paleoproterozoic and Newarchaeozoic zircons and Paleozoic zircons are most. The latest Late Permian Langshan basalts may developed in the extensional tectonics resulting from the delamination of the lithosphere after the closure of the Paleoasian Ocean, the extension of this period occurred along the whole north margin of the North China Plate including the Alashan block, which means that the Alashan block jointed with the North China Plate at least before the Late Paleozoic.关键词
狼山/枕状熔岩/古亚洲洋/锆石/LA-ICP-MSKey words
Langshan/ pillow lava/ Paleoasian Ocean/ zircon/ LA-ICP-MS分类
天文与地球科学引用本文复制引用
张进,李锦轶,刘建峰,李岩峰,曲军峰,张义平..内蒙古狼山西南地区枕状玄武岩LA-ICP-MS锆石U-Pb年龄及意义[J].地质通报,2013,32(2):287-296,10.基金项目
中国地质调查局项目《兴蒙造山带基本构造格局综合调查和研究》(编号:1212011085476)、《中国主要陆块晚前寒武纪以来裂解重现过程的再造及其对成矿作用的制约》(编号:1212011121064)和国家自然科学基金《阿拉善东缘、南缘下古生界物源、变形及构造归属》(批准号:41172198) （编号:1212011085476）
