北羌塘盆地托纳木地区雪山组的孢粉型化石及其指示的古植被和古气候特征

The Palynological Sporopollen Fossils and Its Indicated Palaeovegetation and Palaeoclimate Characteristics of Xueshan Formation in Tuonamu Area,North Qiangtang Basin

通过对北羌塘盆地托纳木地区雪山组产出丰富的Clasopollis和Dicheiaropollis花粉研究,该组孢粉可建立为CD组合,时代属早白垩世早期。分析认为托纳木地区早白垩世早期的古植被群落以Clasopollis和Dicheiaropollis有亲缘关系(或母体植物)耐干热的掌鳞杉科植物为优势类群,林间或林下还生长着少量桫椤科、里白孢属等植物。本孢粉植物群反映的气候特征是干旱的热带-亚热带气候。本研究丰富了北羌塘盆地早白垩世孢粉地质学及其古植被和古气候的认识。

By study the abundant pollen of Clasopollis and Dicheiaropollis in Xueshan formation in Tuona-mu area,North Qiangtang Basin,the sporopollen of this formation can be established as CD assemblage,dating from the Early Early Cretaceous.The analysis suggests that the Early Cretaceous palaeo-vegetation communities in Tuonamu area were dominated by the pyridae plants of Clasopollis and Dicheiaropollis,which were related to each other(or their parent plants)and tolerant to dry heat.A small number of other plants,such as Alsophila and Lepidopsis,grew in the forest or under the forest.The climate characteristic reflected by this palynological flora is the arid tropical-subtropical climate.By this study,it enriched the understanding of Early Cretaceous palynology,palaeo-vegetation and palaeo-climate in the Qiangtang basin.