地质通报2024，Vol.43Issue(6)：1047-1058,12.DOI:10.12097/gbc.2024.01.044
内蒙古西乌旗地区中—晚更新世孢粉记录及其古气候意义
Sporopollen record during Mid-Late Pleistocene from West Ujimqin Banner,Inner Mongolia,and its paleoclimatic significance
摘要
Abstract
In order to reconstruct the paleoclimate and explore its evolution model and response to the global paleoclimate during the Mid-Late Pleistocene in the Bayinhua Basin,West Ujimqin Banner,Inner Mongolia,the sporopollen of ZK03 and ZK04 in the basin were systematically identified.Combining Coniss analyze with Co-existence Approach,we quantitatively reconstruct the palaeoclimate parameters in research area.68 genera are identified and divided into 3 assemblages as:(Ⅰ)Pinus-Betula-Typha assemblage;(Ⅱ)Quercus-Ephedra-Artemisia assemblage;(Ⅲ)Cyperaceae-Typha-Polypodiaceae assemblage.The age of assemblage Ⅰand assemblage Ⅱwas Middle Pleistocene,while the age of assemblage Ⅲwas Late Pleistocene.The vegetation types experienced the transformation as broadleaved-steppe type with a small amount of coniferous forest vegetation→broadleaved-steppe type vegetation→savanna-steppe vegetation.Palaeoclimate experienced three periods of transition from relatively warm and humid climate to relatively warm and cool semi-arid climate and then to relatively warm and humid climate.The annual average temperature and annual rainfall corresponding to each period also showed a numerical process of change from high to low and then to high.The trend from cool to warm at the turn of the Middle Pleistocene/Late Pleistocene can be well coupled with the trend of global mean temperature that indicated by the oxygen isotopes of Greenland ice core.关键词
西乌旗/更新世/孢粉组合/古气候/地质调查工程/共存因子分析Key words
West Ujimqin Banner/Pleistocene/sporopollen assemblages/paleoclimate/geological survey engineering/Co-existence Approach分类
天文与地球科学引用本文复制引用
杨兵,陈喜庆,葛天助,韦一,刘迁..内蒙古西乌旗地区中—晚更新世孢粉记录及其古气候意义[J].地质通报,2024,43(6):1047-1058,12.基金项目
国家自然科学基金项目《青藏高原始新世—渐新世古海拔演化的介形类和同位素证据》(批准号:41702366)、中国地质调查局项目《实物地质资料采集更新与数字化应用》(编号:DD20230138)和中央高校基本科研业务费《古近纪华北—华南非海相介形类动物化石差异演化及其地质意义》(编号:3142018004) （批准号:41702366）
