四川中生代陆相盆地孢粉组合所反映的古植被与古气候特征

The Mesozoic Sporopollen Assemblage in the Sichuan Basin and Its Significance to Paleovegetation and Paleoclimate

四川中生界陆相地层中所采集的70余件孢粉样品，仅晚三叠世须家河组、中侏罗世新田沟组和沙溪庙组中的20余件样品中分离和鉴定有丰富孢粉化石。研究发现，这些孢粉化石记录了四川盆地内晚三叠世-白垩纪植物属种和数量持续减少，气候环境由温暖湿润演变为炎热和干旱的过程。

The 70 mudrock samples have been collected from the Mesozoic continental strata in the Sichuan basin, but only more than 20 samples from the Upper Triassic Xujiahe Formation, Middle Jurassic Xintiangou Formation and Shaximiao Formation yield abundant sporopollen, 23 genus and 81 species among which are firstly discovered. Up to now, 146 genus and 341 species have been discovered in the Upper Triassic Xujiaohe Formation to the Cretaceous Guankou Formation in the Sichuan basin. The study shows that the plant genus and amount went on decrease, and suggests that climate in Sichuan basin changed from warm and humid in the Late Triassic to hot and arid in the Cretaceous.