【摘 要】
：
The Late Triassic Tianqiaoling flora is well-known in China,and its discovery has changed our understanding of Chinese Late Triassic phytogeographical divisions.More broadly,this flora has great significance for the study of phytogeo-graphy in East Asia d
【机 构】
：
Key Lab of Evolution of Past Life in NE Asia,Ministry of Natural Resources,Shenyang Normal Universit
论文部分内容阅读
The Late Triassic Tianqiaoling flora is well-known in China,and its discovery has changed our understanding of Chinese Late Triassic phytogeographical divisions.More broadly,this flora has great significance for the study of phytogeo-graphy in East Asia during this time.However,the previous dating of this flora was only evidenced by plant fossils and stratigraphic correlation,and the accurate dating has still not been achieved.In this study,rhyolite samples were collected from the bottom of the Tianqiaoling Formation,which is conformally contacted the Tianqiaoling flora-bearing beds.The results of new U-Pb dating gave ages for the rhyolites of 212.8±2.5 Ma,indicating the end of Malugou Formation and initial Tianqiaoling Formation in deposition occurred in the late Norian(～227-208.5 Ma),which is contemporaneous with the peak of the Tian-qiaoling flora in development.Our radiometric dating results are basically consistent with paleobiological evidence.The new age provides a key anchor point for regional stratigraphic correlation of the Tianqiaoling flora with its related Late Triassic floras,and contribute to a better understanding of the geology and phytogeography in the East Asia,particularly in the“triangle region”covering the eastern Jilin(China),South Primorye(Russia)and Southwest Japan,during the Late Triassic.
其他文献
Neuroblastoma (NB) is one of the most common malignant tumors in children,with variable clinical behaviors and a 15％ death rate of all malignancies in childhood.However,genetic susceptibility to sporadic NB in Han Chinese patients is largely unknown.To id
The Y chromosome plays key roles in male fertility and reflects the evolutionary history of paternal lineages.Here,we present a de novo genome assembly of the Hu sheep with the first draft assembly of ovine Y chromosome(oMSY),using nanopore sequencing and
Host-pathogen interactions in the setting of chronic pulmonary inflammation remain unclear,and the occurrence of pneumonia is increased in patients with chronic obstructive pulmonary disease who use immunosuppressive drugs.We performed Acineto-bacter baum
Clinical cases have reported pulmonary arterial structural and functional abnormalities in patients with Kawasaki disease (KD);however,the underlying mechanisms are unclear.In this study,a KD rat model was established via the intraperitoneal injection of
The history and mechanisms of dust storms in northern China remain unclear owing to the paucity of reliable long-term,high-resolution geological records.In this study,we reconstructed the dust storm history of the last～500 years in northern China,based on
As a potential cancer immunotherapeutic agent,chlorogenic acid(CHA)has entered phase Ⅱ clinical trials in China as a lyophilized powder formulation for treating glioma.However,the in vivo instability of CHA necessitates daily intramuscular injections,resu
Global warming and its climatic and environmental effects have mainly been investigated in terms of the absolute warming rate.Little attention has been paid to the contribution of absolute warming rate to variability on various time scales of surface air
Almost all proxy-based temperature reconstructions for East Asia have hitherto been designed to resolve summer or annual temperature variability.Reconstruction for the winter temperature is still lacking.Here,we report an annually resolved,winter-season (
Quantifying the density contrasts of the Earth\'s inner core boundary(ICB)is crucial to understand core-mantle coupling and the generation of the geodynamo.The PKiKP/PcP amplitude ratio is commonly used to obtain the density contrast at the ICB,but its
Quartz crystallinity index(QCI)was used to reflect the crystallisation of silica in the Late Ordovician Wufeng(WF)and Early Silurian Longmaxi(LM)Formation shale,as well as the airborne volcanic ash-derived silica in the Lucaogou Formation tuffaceous shale