西藏西北部聂尔错地区晚侏罗世火山岩纳日组(J_(3)n)的厘定及地质特征  

Determination and Geological Characteristics of the Late Jurassic Volcanic Nari Formation (J_(3)n) in NercoArea, Northwest Tibet

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)

机构地区：[1]西藏自治区地质矿产勘查开发局区域地质调查大队,拉萨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)。

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.

关 键 词：纳日组 新建 上侏罗统 聂尔错地区 西藏 

分 类 号：P539.2[天文地球—古生物学与地层学]