渤海湾盆地东部中新世馆陶组古植物群及其古气候分析  

PALEOFLORA AND PALEOCLIMATE ANALYSIS OF THE MIOCENE GUANTAO FORMATION IN EASTERN BOHAI BAY BASIN

作　　者：汪舒 尹太举[1] WANG Shu;YIN Tai-ju(School of Earth Sciences,Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学地球科学学院

出　　处：《地质与资源》2019年第6期503-511,552,共10页Geology and Resources

基　　金：国家自然科学基金“渤海东部新近系河湖交互地区高精度层序地层、沉积体系精细分析技术与有利勘探方向研究”(项目编号41672119)

摘　　要：通过孢粉图谱的绘制及孢粉数据的统计分析,得出渤东地区馆陶组植物孢粉在地层上的组合特征及气候演化特点.主要表现为:乔木层的演化分为两个阶段,馆陶组早期(孢粉组合带Ⅲ、Ⅳ)——针叶树为主的混交林;馆陶组晚期(孢粉组合带Ⅰ、Ⅱ)——落叶林含有许多亚热带成分.统计发现馆陶组湿生植物明显多于旱生植物,喜热植物明显多于喜温植物,具有典型的亚热带季风气候特点.挑选典型孢粉计算得到S/A、E-T两个参数,详细地刻画了样品点间的气候变化,证明馆陶组气候波动频繁,气候以湿热为主.The characteristics of sporopollen assemblage and climate evolution of Guantao Formation in eastern Bohai Bay area are obtained through drawing of the sporopollen spectrum and statistic analysis of sporopollen data,which are shown as follows.The evolution of tree layer is divided into two stages:coniferous tree-dominated mixed forest in the early Guantao Formation(with sporopollen assemblage zone III and IV),and deciduous forest containing many subtropical elements in the late Guantao Formation(with sporopollen assemblage zone I and II).It is found from the statistics that the hygrophyte are significantly more than the xerophyte,and the philotherm more than the thermophile,with a typical subtropical monsoon climate characteristics.The S/A and E-T parameters are calculated by selected typical sporopollen to describe the climate changes between sample spots in detail,which proves that the climate of Guantao Formation fluctuated frequently and was mainly hot and humid.

关 键 词：馆陶组 孢粉组合 古气候 古生态 渤海湾盆地 

分 类 号：Q911.5[天文地球—古生物学与地层学] Q914[生物学—古生物学]