上海横沙岛第四纪孢粉组合、古气候演化序列及区域对比  

Quaternary Pollen Assemblages,Paleoclimate Evolution Sequence and Regional Correlation in Hengsha Island,Shanghai City

作　　者：柯学[1] 唐婷婷 张宗言[3] 谢建磊[4] 邹亚锐 徐亚东[6] Ke Xue;Tang Tingting;Zhang Zongyan;Xie Jianlei;Zou Yarui;Xu Yadong(Institute of Geological Survey,China University of Geosciences,Wuhan 430074,China;Guizhou Geogogical Survey,Guiyang 550081,China;Wuhan Center of China Geological Survey,Wuhan 430205,China;Shanghai Institute of Geological Survey,Shanghai 200072,China;Hubei Institute of Geosciences,Wuhan 430034,China;Hubei Key Laboratory of Critical Zone Evolution,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学地质调查研究院,湖北武汉430074 [2]贵州省地质调查院,贵州贵阳550081 [3]中国地质调查局武汉地质调查中心,湖北武汉430205 [4]上海市地质调查研究院,上海200072 [5]湖北省地质科学研究院,湖北武汉430034 [6]流域关键带演化湖北省重点实验室,中国地质大学地球科学学院,湖北武汉430074

出　　处：《地球科学》2024年第10期3629-3646,共18页Earth Science

基　　金：中国地质调查局项目(Nos.DD20221645,DD20190811)。

摘　　要：为了解长江三角洲地区第四纪植被与气候演化历史,通过对上海横沙岛LZK1钻孔第四纪沉积地层和孢粉的分析,揭示出该地区第四纪孢粉组合代表的植被面貌自下而上表现为:针叶阔叶混交林-灌丛草甸→针叶落叶阔叶混交林-灌丛草甸→针叶林-灌丛草甸→常绿落叶阔叶混交林→针叶落叶阔叶混交林→落叶阔叶林→针叶林→阔叶针叶混交林→针叶落叶阔叶混交林-灌丛草甸→常绿落叶阔叶混交林-灌丛草甸→常绿落叶阔叶混交林→落叶阔叶针叶混交林.受地貌、海侵、第四纪冰期/间冰期的冷暖交替事件及新构造运动等影响,研究区第四纪以来气候、环境变化频繁.钻孔岩心的沉积环境特征和孢粉组合所反映的气候变化可响应昆仑冰期、大间冰期、古乡冰期、末次间冰期等气候阶段.末次冰消期气候表现为温凉略干,晚更新世末期研究区对Oldest Dryas、IACP事件和Younger Dryas等冷事件反应敏感.进入全新世后,研究区气候整体回暖,湿度增大,海平面持续上升,其间经历了~8.2 ka和~4.2 ka的冷事件,发生了短暂的降温和干旱事件.至全新世晚期受小冰期事件影响,研究区气温和湿度有所降低,海水东退.In order to understand the evolution history of Quaternary vegetation and climate in Yangtze delta,the study of Core LZK1 from Hengshan Island,Shanghai on sediment lithology and high resolution spore-pollen data suggests that the changes in pollen assemblage in Quaternary have resulted from the joint effect of topography,transgression and,which show a regular pattern of variation,including coniferous and broad-leaved mixed forest-shrub meadow,coniferous and deciduous broad-leaved mixed forest-shrub meadow,coniferous forest-shrub meadow,evergreen and deciduous broad-leaved mixed forest,coniferous and deciduous broad-leaved mixed forest,deciduous broad-leaved forest,coniferous forest,broad-leaved and coniferous mixed forest,coniferous and deciduous broad-leaved mixed forest-shrub meadow,evergreen and deciduous broad-leaved mixed forest-shrub meadow,evergreen and deciduous broad-leaved mixed forest,deciduous broad-leaved and coniferous mixed forest.The climate changes reflected by the sedimentary environment and palynological assemblages of Core LZK1 can be responded to the climatic events such as the Kunlun glaciation,the great interglaciation,the Guxiang glaciation and the last interglaciation.The climate of the last deglaciation period was cool and slightly dry.At the end of the Late Pleistocene,the study area was sensitive to the cold events such as Oldest Dryas,IACP events,and Younger Dryas.When entering the Holocene,the climate warmed up,the humidity increased,and the sea level continued to rise.During this period,there were cold events of-8.2 ka and-4.2 ka,and a brief process of cooling and drought occurred.Influenced by the Little Ice Age in the Late Holocene,the temperature and humidity decreased and the sea water retreated eastward.

关 键 词：第四纪 孢粉 古气候 古环境 长江三角洲 地层学 

分 类 号：P52[天文地球—古生物学与地层学]