地质通报2016，Vol.35Issue(9)：1441-1447,7.
青海南祁连巴龙贡噶尔组变火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义
LA-ICP-MS zircon U-Pb ages of metamorphic volcanic rocks in Balonggongge’er Formation of South Qilian Mountain in Qinghai Province and their geological significance
摘要
Abstract
The Balonggongge’er Formation is widely distributed in the South Qilian Mountain. Due to the absence of the fossils and available geochronologic data, its geological epoch has aroused much attention. Based on 1∶50000 regional geological survey, the au⁃thors identified some volcanic flows, which consist of dacites within the Balonggongge ’er Formation. LA-ICP-MS zircon U-Pb analyses indicate that a dacite sample was formed at 457.6±2.4Ma, belonging to the Late Ordovician period. This is the first precise ra⁃diometric age for the Balonggongge’er Formation, which provides some persuasive geochronologic evidence for the disintegration and the epoch of the formation. The new discoveries and results are of importance to the Early Paleozoic stratigraphic sequence and tectonic evolution in the South Qilian Mountain.关键词
南祁连/巴龙贡噶尔组/变火山岩/晚奥陶世/LA-ICP-MS锆石U-Pb年龄Key words
South Qilian Mountain/Balonggongge’er Formation/metamorphic volcanic rocks/Late Ordovician/LA-ICP-MS zir-con U-Pb age分类
天文与地球科学引用本文复制引用
牛广智,黄岗,邓昌生,徐岩,陈涛,季春,李文军..青海南祁连巴龙贡噶尔组变火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2016,35(9):1441-1447,7.基金项目
中国地质调查局项目 （）
