摘要
位于兴蒙造山带东段的宝力高庙组对研究古亚洲洋闭合的时限具有重要意义。在内蒙古锡林郭勒盟1∶5万区域地质调查中,笔者在宝力高庙组一段内发现了大量的植物化石,经鉴定主要为Angaropteridium car⁃diopteroides(Schimp.)Zalessky、Noeggerathiopsis cf.theodori Tsohirkova et Zalessky、Noeggerathiopsis suban⁃gusta Zalessky、Noeggerathiopsis sp.、Zamiopteris sp.等,均系安加拉植物群的重要分子,时代为晚石炭世。此外,在该段地层内还发现少量海相双壳类:Sanguinolites sp.、Modiomorpha?sp.。结合二段角闪安山岩和三段流纹岩的锆石U-Pb年龄分别为(320.1±5.7)Ma和(315.1±4.1)Ma的证据,进一步确定一段时代为晚石炭世,并从古生物学角度探讨了研究区古亚洲洋的闭合时间、分析了研究区晚石炭世古环境特征。
The Baoligaomiao Formation,located in the eastern part of the Xingmeng orogenic belt,is of great significance to study of the closure of the Paleo-Asian Ocean.During the 1∶50000 regional geological survey in Xilingolaemu,Inner Mongolia,a large number of plant fossils were collected from the First Member of Baoligaomiao formation,such as Angaropteridium cardiopteroides(Schimp.)Zalessky、Noeggerathiopsis cf.theodori Tsohirkovaet Zalessky、Noeggerathiopsis subangusta Zalessky、Noeggerathiopsis sp.、Zamiopteris sp.,all of these fossils are impor⁃tant elements of the Late Carboniferous Angara flora.In addition,a small number of marine bivalves(such as San⁃guinolites sp.and Modiomorpha?sp.)were also yielded from this stratum.Based on the zircon U-Pb ages(320.1±5.7)Ma of amphibolite andesite from the Second Member and(315.1±4.1)Ma of rhyolite from the Third Member,it also indicates the age of the First Member should be the Late Carboniferous.This discovery is of important signifi⁃cance to the paleogeography and the closure time of the Paleo-Asian Ocean in the study area.
作者
张云云
李新发
刘博
王建民
马明
任柄璋
李利阳
谢志远
李鹏辉
ZHANG Yunyun;LI Xinfa;LIU Bo;WANG Jianmin;MA Ming;REN Bingzhang;LI Liyang;XIE Zhiyuan;LI Penghui(School of Environment and Surveying Engineering,Suzhou University,Suzhou 234000,Anhui,China;School of Resources and Civil Engineering,Suzhou University,Suzhou 234000,Anhui,China;Langfang Comprehensive Natural Resources Survey Center,China Geo-logical Survey,Langfang 065099,Hebei,China;No.1 Geological Team of Shandong Provincial Bureau of Geology and Mineral Re-sources,Jinan 250014,Shandong,China)
出处
《矿产勘查》
2025年第1期27-33,共7页
Mineral Exploration
基金
安徽省公益性地质项目(2022-g-1-4)
宿州学院博士科研启动基金(2021BSK036)
安徽省教育厅重点项目(2023AH052243)
中国地质调查局项目(12120114062101)联合资助。
关键词
安加拉植物
宝力高庙组
晚石炭世
阿巴嘎旗
古亚洲洋
Angara flora
Baoligaomaio Formation
Late Carboniferous
Abagaqi
Paleo-Asian Ocean
