Early Jurassic Climate Warming in Eastern Siberia: First Macrofloristic Evidence from Irkutsk Basin, Russia  

作　　者：Andrey FROLOV Irina MASHCHUK 

机构地区：[1]Institute of the Earth's Crust,Siberian Branch of the Russian Academy of Sciences,Irkutsk,664033,Russia

出　　处：《Acta Geologica Sinica(English Edition)》2024年第4期1035-1050,共16页地质学报（英文版）

摘　　要：Numerous new records of Ferganiella, Podozamites, and Schidolepium, including a new species, Ferganiella ivantsovii sp. nov., are described from the Early Jurassic(Toarcian) Middle Subformation of the Prisayan Formation from the Euro-Sinian paleofloristic region in the Irkutsk Basin, Eastern Siberia, Russia. An analysis of the paleogeographic distribution of Ferganiella and Podozamites shows that both genera were the most diverse and numerous in the East Asian province of the Euro-Sinian region and in the Northern Chinese province of the Siberian region during the Early and Middle Jurassic. These phytochoria were located in the subtropical and temperate subtropical climate zones, which allows us to consider Ferganiella and Podozamites as thermophilic plants, which are important indicators of the Early Toarcian climatic optimum. Their abundance in the Irkutsk Basin thus may indicate Early Toarcian warming;further abundant Schidolepium cones, which produced Araucariacites pollen, typical for Euro-Sinian flora complement the scenario. Thus, the new finds are the first macrofloristic indicators of the Toarcian climatic optimum in the Irkutsk Basin.

关 键 词：PALEOBOTANY Ferganiella Podozamites Schidolepium Toarcian climatic optimum PALEOBIOGEOGRAPHY Siberian paleofloristic region Irkutsk 

分 类 号：P532[天文地球—古生物学与地层学] P534.52[天文地球—地质学]