沉积与特提斯地质2026，Vol.46Issue(2)：288-298,11.DOI:10.19826/j.cnki.1009-3850.2026.04001
藏北日土地区南羌塘乌拉尔统曲地组孢粉化石的发现及意义
Discovery and significance of sporopollen fossils from the Cisuralian Qudi Formation in the South Qiangtang Block,Rutog area,northern Xizang
摘要
Abstract
Dispersed palynomorphs from the Cisuralian Qudi Formation within the South Qiangtang stratigraphic region of Rutog area,northern Xizang,are reported here for the first time.Gymnosperm pollen(80.0%-88.6%)is significantly dominant over pteridophyte spores(11.4%-20.0%),with the bisaccate striate pollen Protohaploxypinus and monosaccate pollen Potonieisporites being the most prominent.This assemblage is designated as the Protohaploxypinus—Potonieisporites Assemblage.It exhibits distinct Sub-Angara floristic characteristics,while also containing the Gondwanan diagnostic taxon Plicatipollenites.This pattern aligns with observations from the Baoshan and Lhasa blocks,indicating shared plant taxa between the Gondwanan and Sub-Angaran realms during the Early Permian.The observed floral mixing likely resulted from Gondwana-affiliated rifted terranes(e.g.,South Qiangtang,Lhasa,and Baoshan blocks),serving as stepping stones for the"island hopping"dispersal of microfloras,such as bisaccate ribbed pollen,following the Early Permian deglaciation.关键词
孢粉化石/乌拉尔统/日土地区/南羌塘地块Key words
sporopollen fossils/Cisuralian/Rutog area/South Qiangtang Block分类
天文与地球科学引用本文复制引用
张予杰..藏北日土地区南羌塘乌拉尔统曲地组孢粉化石的发现及意义[J].沉积与特提斯地质,2026,46(2):288-298,11.基金项目
中国地质调查局项目(D20250102609) （D20250102609）
国家自然科学基金项目(42241205,42473021) （42241205,42473021）
第二次青藏高原综合科学考察项目(2019QZKK0706) （2019QZKK0706）
