摘要
在冈底斯北缘革吉-雄巴一带发育一套以火山碎屑岩、火山熔岩为主的火山岩系地层,研究程度较低。在1∶5万聂尔错地区区域地质调查中,该套火山岩获得3个锆石U-Pb法同位素年龄值145.3±1.6Ma、148.7±1.3Ma、142.3±2.3Ma,由此判断该火山岩形成时代为晚侏罗世。对其岩石地球化学特征、火山喷发韵律及构造环境等进行研究。将其归入冈底斯-腾冲地层区革吉-申扎地层分区,新建纳日组。
A set of volcanic rocks,mainly composed of volcaniclastic rock and volcanic lava,is developed in the Geji-Xiongba area on the northern margin of Gangdise,and the research degree is relatively low.Three zircon U-Pb isotopic ages of 145.3±1.6Ma,148.7±1.3Ma and 142.3±2.3Ma were obtained from the regional geological survey of 1/5 Wanerco area,indicating that the volcanic rocks were formed in the Late Jurassic.Based on the studied of petrogeochemical characteristics,volcanic eruption rhythm and tectonic environment,it was classified into the Geji-Shenzha stratigraphic division of Gangdis-Tengchong stratigraphic region,and newly established Nari Formation.
作者
维色坚才
格桑次仁
边巴次仁
WEISE Jiancai;GESANG Ciren;BIANBA Ciren(Regional Geological Survey Team,Tibet Bureau of Geology and Mineral Exploration and Development,Lhasa 851400)
出处
《四川地质学报》
2025年第1期17-29,共13页
Acta Geologica Sichuan
基金
西藏班公湖-怒江成矿带地质矿产调查“西藏改则聂耳错地区1∶5万6幅区域地质调查”(12120114062201)。
关键词
纳日组
新建
上侏罗统
聂尔错地区
西藏
Naeri Formation
newly established
upper Jurassic
Nerco region
Tibet
作者简介
维色坚才(1992-),男,西藏山南人,工程师,研究方向:地质矿产、地质灾害、区域地质调查等。
