First Record of Cyclocarya from the Early Oligocene Qaidam Basin,North Tibet:Implications for the Paleogeography and Paleoecology  

作　　者：Yafei Hou Bowen Song Xiangchuan Li Fang Han Xu Zhang Kexin Zhang 

机构地区：[1]Institute of Geological Survey,China University of Geosciences,Wuhan 430074,China [2]Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China [3]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430074,China [4]College of Earth Sciences and Resources&Key Laboratory of Western Mineral Resources and Geological Engineering of the Ministry of Education,Chang'an University,Xi'an 710054,China [5]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China [6]School of Earth Sciences,East China University of Technology,Nanchang 330013,China

出　　处：《Journal of Earth Science》2024年第1期201-211,共11页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.42072141and 41702363);the Geological Survey of China(No.DD20221645)。

摘　　要：As the largest intermontane basin in the northeastern Tibetan Plateau(TP),the Qaidam Basin provides unique insight into paleoclimatic change and its relationship with global change and uplift on the TP.In this study,based on morphological comparison,fossil fruit of Cyclocarya from the Early Oligocene Shangganchaigou Formation in the Qaidam Basin is assigned as Cyclocarya cf.weylandii.The discovery of Cyclocarya cf.weylandii demonstrates the occurrence of Cyclocarya in the Oligocene sediment in Qaidam Basin.This is the first record of Cyclocarya fossil of Early Oligocene Age in China and indicates that Cyclocarya has existed on the northeastern TP since at least the Early Oligocene.The living analogues of the current fossil now lives in sub-tropical China,where the East Asian Monsoon is prevalent.Integrating the new fossils and previously reported fossil remains of plants and fishes,it can be inferred that the Early Oligocene Qaidam Basin was primarily influenced by westerly circulation and had a relatively warm and humid climate,which was in sharp contrast to the present-day climate in Qaidam Basin.

关 键 词：BIOSTRATIGRAPHY climate change winged-fruit fossil Qaidam Basin Early Oligocene paleoclimate PALEOGEOGRAPHY 

分 类 号：Q914[天文地球—古生物学与地层学] P531[生物学—古生物学]