北羌塘盆地胜利河中-晚侏罗世孢粉组合指示的古植被和古气候特征及其油气意义

Paleovegetation and Paleoclimate Characteristics Indicated by Spore-pollen Assemblages of the Middle-Late Jurassic in Shenglihe area,North Qiangtang Basin,its Petroleum Significance

在北羌塘盆地胜利河地区原侏罗系中上统采集到丰富的孢粉化石,该孢粉化石组合以Classopollis、Cyathidites、Osmundacidites及Brevilaesuraspora占主要趋势,经研究及区域对比孢子花粉化石组合时代为中-晚侏罗世。该时期孢粉组合指示的古植被特征以喜干热的掌鳞杉科(Chriolepidaceae)为优势类群,还有少数苏铁科、南美杉科、松科、杉科、松柏科、罗汉松科等植物伴生其间,林下生长着类型多样的蕨类植物。因此,本孢粉植物群反映的古气候属于干旱炎热的热带-亚热带。

Abundant sporopollen fossils were collected from the Upper Middle Jurassic in the Shenglihe area of the North Qiangtang basin.The main trend of the sporopollen assemblage is classopolis,Cyclonidites,Osmundacitites and Brevilaesuraspora.The age of the sporopollen assemblage is Middle Late Jurassic.The ancient vegetation characteristics indicated by the sporopollen assemblage in this period are dominated by the dry and hot palmatidaceae,and a few Cycadiaceae,South American fir,Pine,Fir,Coniferae,Arhat Pine and other plants are accompanied,under which there are various types of fern plants.Therefore,the paleoclimate reflected by the palynoflora belongs to the hot and arid tropics subtropics.