地质学报2017，Vol.91Issue(12)：2608-2622,15.
基于共存分析法和叶缘分析法重建中国渐新世年均温
Quantitative Reconstruction of Oligocene Mean Annual Temperatures in China based on Coexistence Approach and Leaf Margin Analysis
摘要
Abstract
The Oligocene is characterized by gradually global cooling and represents an early "icehouse" epoch during the Cenozoic.The plant fossils,as the record of geological time,can reflect the climate change of continents at that period.In this study,the Mean Annual Temperatures (MATs) of five Oligocene floras in China were reconstructed using Coexistence Approach (CA) and the MATs of four floras with no less than 15 woody dicotyledonous taxa were analyzed using Leaf Margin Analysis (LMA).Estimated MATs were consistent with the palaeoclimate indicated by the taxa of these palaeofloras.LMA gives consistently lower MAT predictions than these of CA,while MATs derived from the East Asian LMA model are consistently higher than that derived from the Chinese LMA model.Through analysis of the factors affecting the results of two methods,CA-based MAT can better represent the annual temperatures at fossil locations then,with 13.3～15.6 ℃ for the palaeoflora of the lower member of the Xianshuihe Formation,12.1～19.4 ℃ for the palaeoflora of the Daqiao member of the Yangliantun Formation,14.3～16.8 ℃ for the Sanhe palaeoflora,19.7 ～ 23.7 ℃ for the Jinggu palaeoflora and 22.0～ 23.6 ℃ for the Ningming palaeoflora,respectively.Due to the fact that the annul temperatures restored using CA were higher than present ones,it can be inferred that global temperatures have been relatively lower since the Oligocene,but warmer than that today.关键词
年均温/共存分析法/叶缘分析法/植物化石/渐新世Key words
mean annual temperature/coexistence approach/leaf margin analysis/plant fossil/oligocene引用本文复制引用
王秋军,毛铁,孙柏年,马福军,吴步青,夏燕梅,刘松..基于共存分析法和叶缘分析法重建中国渐新世年均温[J].地质学报,2017,91(12):2608-2622,15.基金项目
本文为国家自然科学基金(编号:41172022),贵州省古生物研究中心建设基金(编号:黔科合计Z字[2014]4003号),贵州师范学院科研基金项目(编号:2015BS014),贵州大学引进人才科研项目(编号:贵大人基合字(2015)35号)资助的成果. （编号:41172022）
