The stratigraphic division and sequence of the Upper Cretaceous sediments in eastern Heilongjiang Province,China,have been ambiguous and controversial,mainly due to a lack of biostratigraphically useful fossils and re...The stratigraphic division and sequence of the Upper Cretaceous sediments in eastern Heilongjiang Province,China,have been ambiguous and controversial,mainly due to a lack of biostratigraphically useful fossils and related radiometric dating.A new species of angiospermous fossil plant.Platanus heilongjiangensis sp.nov.,from Qitaihe in eastern Heilongjiang has been found in sediments conformably above which zircons from a rhyolitic tuff has been dated by U-Pb radiometric methods as 96.2±1.7 Ma.indicating that the Upper Houshigou Formation is of Cenomanian age.This discovery not only provides new data to improve our stratigraphic understanding of the Houshigou Formation,but also shows that Platanus flourished in the early Late Cretaceous floras of the region.This new study also indicates active volcanism taking place in the eastern Heilongjiang region during the Cenomanian of the Late Cretaceous.展开更多
The Songliao Basin is one of the largest non-marine petroliferous basins in the globally and contains nearly complete Cretaceous terrestrial sedimentary records[1,2].The Shahezi Formation,named after Shahezi Village,C...The Songliao Basin is one of the largest non-marine petroliferous basins in the globally and contains nearly complete Cretaceous terrestrial sedimentary records[1,2].The Shahezi Formation,named after Shahezi Village,Changtu County,Liaoning Province,is a thick terrestrial clastic sedimentary succession deposited during the rift period of the Songliao Basin[1].Accordingly,it is significant for research on initial basin history restoration and global continental–marine stratigraphic correlation,to certificate the deposition time of the Shahezi Formation[2–4].展开更多
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 s...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 phytogeography 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 Tianqiaoling 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.展开更多
基金the Project of the MOST,China(No.2015FY310100)Project of China Geology Survey(No.DD20160120-04) for their financial supportsthe Key Lab of Evolution of Past Life in NE Asia, MLRC (in Shenyang), for research support
文摘The stratigraphic division and sequence of the Upper Cretaceous sediments in eastern Heilongjiang Province,China,have been ambiguous and controversial,mainly due to a lack of biostratigraphically useful fossils and related radiometric dating.A new species of angiospermous fossil plant.Platanus heilongjiangensis sp.nov.,from Qitaihe in eastern Heilongjiang has been found in sediments conformably above which zircons from a rhyolitic tuff has been dated by U-Pb radiometric methods as 96.2±1.7 Ma.indicating that the Upper Houshigou Formation is of Cenomanian age.This discovery not only provides new data to improve our stratigraphic understanding of the Houshigou Formation,but also shows that Platanus flourished in the early Late Cretaceous floras of the region.This new study also indicates active volcanism taking place in the eastern Heilongjiang region during the Cenomanian of the Late Cretaceous.
基金This work was supported by the National Natural Science Foundation of China(41790453)the National Key Research&Development Program of China(2019YFC0605402)the China Geological Survey Program(DD20190010 and DD20160207)。
文摘The Songliao Basin is one of the largest non-marine petroliferous basins in the globally and contains nearly complete Cretaceous terrestrial sedimentary records[1,2].The Shahezi Formation,named after Shahezi Village,Changtu County,Liaoning Province,is a thick terrestrial clastic sedimentary succession deposited during the rift period of the Songliao Basin[1].Accordingly,it is significant for research on initial basin history restoration and global continental–marine stratigraphic correlation,to certificate the deposition time of the Shahezi Formation[2–4].
基金supported by the National Natural Science Foundation of China(Grant No.41072011)the Education Department of Liaoning Province(Grant No.LQN201916)the Scientific Research Foundation of Shenyang Normal University,China(Grant No.BS201911)。
文摘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 phytogeography 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 Tianqiaoling 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.
