桂林理工大学学报2017，Vol.37Issue(4)：561-569,9.DOI:10.3969/j.issn.1674-9057.2017.04.002
拉萨地块西部亚热区则弄群火山岩锆石U-Pb年龄及其地质意义
Zircon U-Pb ages and geological significance of Zenong Group volcanic rock in Yare area, west of Lhasa block
摘要
Abstract
The evolution of Neo-Tethys and associated magmatism during Mesozoic-Cenozoic is a topic of much debate in geoscience.This research of Neo-Tethys and its evolution is of great significance to the structure evolution of southern margin of the Lhasa block.With the dacite and rhyolite of the Zenong Group exposed in Yare area as the study object,in a detailed field investigation and the basis of previous research,and the method of LA-ICP-MS,the author got the zircon dating of the volcanic rocks.The result is that the ages of the zircon from the dacite (51.3 ±0.4 Ma) and the rhyolite (50.1 ±0.3 Ma) gathered in the stratum of Zenong all younger than the accepted ages (108.6-131 Ma) but consistent with the ages of the volcanic rocks of the Linzizong Group (30.43-69.97 Ma).So,the author found the formation in this area which was once thought as "Zenong Group" may be the Linzizong Group.Combined with previous research,it indicates that the chronostratigraphy of Zenong volcanic rock formation distributing in the whole west of Lhasa block should be redefined.关键词
则弄群/林子宗群/LA-ICP-MS锆石U-Pb测年/拉萨地块/青藏高原Key words
Zenong Group/Linzizong Group/zircon LA-ICP-MS U-Pb dating/Lhasa block/Tibetan plateau分类
天文与地球科学引用本文复制引用
李强,冉孟兰,康志强,杨锋,韦乃韶,韦天伟,刘迪..拉萨地块西部亚热区则弄群火山岩锆石U-Pb年龄及其地质意义[J].桂林理工大学学报,2017,37(4):561-569,9.基金项目
国家自然科学基金项目(41003018 （）
41463001) （）
中国地质调查局青藏高原地质研究中心开放课题(2014-02) （2014-02）
广西八桂学者项目(2013许继峰) （2013许继峰）
广西有色金属隐伏矿床勘查及材料开发协同创新中心项目 （）
