摘要
2011—2013年,在内蒙古自治区锡林郭勒盟东乌旗额仁高毕地区开展1∶5万巴彦呼热等四幅区域地质调查期间,在原划归泥盆系上统的安格尔音乌拉组的变质粉砂岩、变质泥岩中首次发现大量笔石、海百合茎及腕羽化石。其中,笔石含有Uncinatograptus uniformis(P?ibyl,1940)、Neomonograptus hercynicus(Perner,1948)和Neomonograptus falcarius(Koren,1969)等,时代为早泥盆世洛赫考夫期。从岩性上看,这套地层也与安格尔音乌拉组有明显区别。因此,该套地层系内蒙古东乌珠穆沁旗地区乃至兴安地区发现的下泥盆统底部地层,并归入下泥盆统泥鳅河组(D_(1)n)。
From 2011 to 2013,in the course of the regional geological surveys of Bayan Hureh and three other areas(scale 1∶50000)in the Xilin Gol League,Inner Mongolia Autonomous Region,a large number of graptolites,carpal plumes and stem fossils of crinoids were discovered in a succession of metamorphic siltstone and mudstone originally assigned to Angeeryinwula Formation of Upper Devonian.The graptolites are identified here as including Uncinatograptus uniformis(P?ibyl,1940),Neomonograptus hercynicus(Perner,1948),Neomonograptus falcarius(Koren,1969),Abiesgraptus?sp.etc.,which indicate an age of Early Devonian(Lochkovian),rather than Late Devonian as previously regarded.This findings confirm the occurrences of Lower Devonian in East Ujimqin Banner area and Xing’an regions of Inner Mongolia.Based on this age revision and a lithostratigraphical comparison with neiboughring areas,the strata are revised to belong to Niqiuhe Formation(D_(1)n).
作者
袁帅
张元动
张恒
YUAN Shuai;ZHANG Yuan Dong;ZHANG Heng(The Natural Resources Bureau of Turks County,Yili 835500;Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;Western Mining Co.,Qinghai Province,Xining 810000)
出处
《地层学杂志》
CSCD
北大核心
2022年第1期93-100,共8页
Journal of Stratigraphy
基金
中国地质调查局地质调查工作项目(1212011220444)资助。
