ISSN 1006-3021 CN11-3474/P
Published bimonthly started in 1979
右江盆地富宁地区石炮组化石及顶部凝灰岩年代学特征及意义
  
关键词:South China block  Youjiang Basin  Early–Middle Triassic  tuff  paleontology  zircon U-Pb age
基金项目:云南省科技计划项目(编号: 202305AD160031; 202401AT070012);中国地质调查局地质调查项目“云南1:5万那佐幅;里往幅;大普弄幅;花甲幅区域地质调查”(编号: DD20160020);云南省自然资源厅基金项目“云南1:5万大庄幅;法裱幅;底土幅;甸中幅区域地质调查”(编号: D202207)
作者单位E-mail
李维科 云南省地质调查院
自然资源部三江成矿作用及资源勘查利用重点实验室 
ynddylwk@163.com 
宛胜 江西省地质调查勘查院基础地质调查所  
刘军平 云南省地质调查院
自然资源部三江成矿作用及资源勘查利用重点实验室
中国地质大学(北京)地球科学与资源学院 
271090834@qq.com 
晏海宝 云南省地质调查院  
何世军 中国冶金地质总局第二地质勘查院  
赵云江 云南省地质调查院  
赵江泰 云南省地质调查院  
卢晓萍 云南省地质调查院  
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摘要:
Chronological Characteristics and Significance of Fossils and Tuff at the Top of Shipao Formation in Funing Area, Youjiang Basin
      Through field geological investigation, the author collected fossils of Early Triassic bivalves and ammonites about 100 m below the interface between Banna Formation of Middle Triassic and Shipao Formation of Lower Triassic in Funing area of Youjiang Basin, and found a tuff layer with a thickness of about 5 m between T1/T2 interface, which was dated by LA-ICP-MS U-Pb isotope. The isotopic ages of (249.0±1.9) Ma, (247.9±3.4) Ma and (245.5±1.6) Ma were obtained from bottom to top, which were consistent within the error range. The upper boundary age of the Shipao Formation was obtained for the first time in the Lower Triassic. The newly discovered tuff beds and fossils can be used as Early–Middle Triassic isochronous stratigraphic markers for regional comparison, which enriches the distribution range of Early Triassic volcanic rocks in Youjiang Basin. It is considered that it is reasonable to use this set of tuff as a marker for the division of T1/T2 in southeastern Yunnan of Youjiang Basin. Based on the previous data, this set of tuffs and fossils provides important chronological and paleontological evidence for the demarcation of T1/T2 boundary in South China block, and it is considered that the age of the Anniian/Olynikian boundary should be set at 245.5 Ma, which may be more reasonable.
LI Weike,WAN Sheng,LIU Junping,YAN Haibao,HE Shijun,ZHAO Yunjiang,ZHAO Jiangtai,LU Xiaoping.2024.Chronological Characteristics and Significance of Fossils and Tuff at the Top of Shipao Formation in Funing Area, Youjiang Basin[J].Acta Geoscientica Sinica,45(4):439-449.
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