甘肃北山窑洞努如地区窑洞努如岩片地层特征及时代讨论  

STRATIGRAPHIC CHARACTERISTICS AND AGE OF YAODONGNURU SLICE IN BEISHAN AREA OF GANSU PROVINCE

作　　者：张国英[1] 刘明强[1] 丁仨平 梁明宏[1] 

机构地区：[1]甘肃省地质调查院,甘肃兰州730000

出　　处：《甘肃地质》2016年第1期12-17,共6页Gansu Geology

基　　金：中国地质调查局地调项目(1212011220371)资助

摘　　要：甘肃北山窑洞努如地区分布着一套浅变质陆源碎屑岩夹火山熔岩、火山碎屑岩、石英岩的组合,前人1:25万马鬃山幅区调报告中命名为窑洞努如岩片,是一个非正式地层单位,时代确定为中晚奥陶世。本文在浅析该岩片的岩石组合、沉积层序及沉积环境的基础上,经同位素测年、微古植物化石等年代学研究,将其时代厘定为晚奥陶世—早志留世,这对研究北山地区早古生代地层及构造演化有重要地质意义。There occurs a series of epimetamorphic terr/genous clastic rocks mixed with lava, pyroclastic rocks and quartzite in Yaodongnuru area of Beishan, Gansu Province. It was named as Yaodongnuru schist in the regional geological investigation report of Mazongshan （1：250000） ,which is an informal stratigraphic unit to determined as the age of the middle Late Ordovician. On the basis of the analysis of the rock assemblage, sedimentary sequence and sedimentary environment of the rock piece, The method of determining the geological age by isotopic the world. This area. dating and micro ancient plant fossils to determine the evolution has important geological significance of Early age of the late Ordovician-as early as in Paleozoic strata and structure of Beishan

关 键 词：窑洞努如岩片 窑洞努如 地层特征 时代讨论 甘肃北山 

分 类 号：P534.4[天文地球—古生物学与地层学]