中三叠世脊椎动物生物地层的高精度时间校准:铀-铅锆石法测定的中国肯氏兽动物群和永和鳄年代
High-precision temporal calibration of Middle Triassic vertebrate biostratigraphy: U-Pb zircon constraints for the Sinokannemeyeria Fauna and Yonghesuchus
摘要
Abstract
Tetrapod assemblages provide a useful means for global correlation of the terrestrial Triassic sedimentary deposits,but currently no reliable temporal framework has been achieved for the Middle Triassic tetrapod assemblages.Here we report U-Pb zircon chemical abrasion-thermal ionization mass spectrometry dates for five volcanic ashes interbedded with vertebrate fossils from the Ermaying and Tongchuan formations of China.Our results support a late Anisian age for the Sinokannemeyeria Fauna and an early Ladinian age for Yonghesuchus Fauna.It is now possible,through biostratigraphic correlation,to provide accurate ages to other Middle Triassic successions such as the Upper Cynognathus Assemblage Zone of the Karoo of South Africa,the Eryosuchus fauna of the Donguz Suite of Russia and the Karamayi Formation of Xinjiang,China.The base of Anisian (Lower/Middle Triassic boundary) should lie below the base of the Ermaying Formation in the Ordos Basin.关键词
中三叠世/二马营组/铜川组/中国肯氏兽动物群/永和鳄/铀-铅锆石法测年Key words
Middle Triassic/Ermaying Formation/Tongchuan Formation/Sinokannemeyeria Fauna/Yonghesuchus/U-Pb dating分类
天文与地球科学引用本文复制引用
刘俊,Jahandar RAMEZANI,李录,尚庆华,徐光辉,汪衍胤,杨嘉声..中三叠世脊椎动物生物地层的高精度时间校准:铀-铅锆石法测定的中国肯氏兽动物群和永和鳄年代[J].古脊椎动物学报,2018,56(1):16-24,9.基金项目
国家重点基础研究发展计划项目(编号:2012CB821902)、国家自然科学基金(批准号:41472017,41661134047)、现代古生物学和地层学国家重点实验室基金(编号:20161101)、中国科学院战略性科技先导专项(B类)(编号:XDPB05)和古生物化石发掘修理专项经费资助.We thank Liu Yu-Feng,Xu Xu,Liu Yu-Dong for their work for collecting fossils and tuff samples.Corwin Sullivan and Sterling Nesbitt read and commented on an early version of this paper.Bruce Rubidge and Spencer Lucas reviewed the paper,and significantly improve it.The research was supported by the National Natural Science Foundation of China (41472017 and 41661134047),State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology,CAS) (20161101),Chinese Academy of Sciences (XDPB05).Fossil collection was also supported by the excavation grant from the Chinese Academy of Sciences. （编号:2012CB821902）
