报告题目：Late Cambrian-Ordovician faunas from Iran and South China: Similarities and differences
报告人：Hadi Jahangir
报告人单位：中国科学院南京地质古生物研究所
报告时间：8月16日（周五）上午10：00
报告地点：图书馆三楼学术报告厅
主办：古生物学与油气地层应用重点实验室、人事教育处
报告简介：
Late Cambrian‒Ordovician stratigraphy and faunas from various sections across different geological zones in Iran and Guizhou Province, South China, were analysed to explore potential biogeographical and palaeogeographical relationships based on faunal evidence, stratigraphy, and geological events during this interval. The possible absence of several conodont biozones at the Cambrian‒Ordovician transition in the biostratigraphical succession of the Yangtze Platform may indicate a hiatus near the system boundary. A similar hiatus has been documented in Alborz tectonic unit of northern Iran.
A notable exception is the Cambrian‒Ordovician transition documented from slope deposits on the Saluk Mountains (Kopet-Dagh domain of Alborztectonic unit), which shows continuous biostratigraphical succession comparable to the Jiangnan Slope of South China. To date, this is the only complete conodont biozonal succession documented from Iran. It is subdivided into 11 succeeding conodont biozones, ranging from the Proconodontusmuelleri to Paltodusdeltifer zones. Two graptolite-bearing horizons with early representative of Rhabdinoporahave been documented from the CordyloduslindstromiZone, close to the inferred position of the Cambrian–Ordovician boundary. Additionally, Iapetognathus conodont elements were recovered from several stratigraphical levels within the CordyloduslindstromiandCordylodus angulatuszones. The presence of early Rhabdinoporaand Iapetognathusconodonts in the lower CordyloduslindstromiZone of southern Kopet-Dagh is of outstanding importance for high resolution correlation of the Cambrian–Ordovician boundary interval and for more precise definition of the system boundary.
Overall, recent progress in studies of Ordovician‒Silurian stratigraphy and faunas of Iran, particularly in the Alborz tectonic unitand the East-Central Iranian Platform, has led to a more accurate definition of stage and system boundaries, as well as a characterisation of the Great Ordovician Biodiversification Event (GOBE) in Iranian sections. It also reveals a distinct similarity between the biostratigraphy and faunas of South China and Iranian terranes.
报告人简介：
Hadi Jahangir博士毕业于马什哈德费尔多西大学（Ferdowsi university of Mashhad），为伊朗古生物协会会员，2021年8月至今于中国科学院南京地质古生物研究所从事特别研究助理工作。目前在《Journal of Asian Earth Sciences》、《Bulletin of Geosciences》等期刊发表多篇学术论文。
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