甘肃北山地区早白垩世松柏类植物Podozamites(苏铁杉属)及其古气候意义  

Podozamites (Conifers) from the Lower Cretaceous of Beishan,Gansu Province and its palaeoclimatic implications

作　　者：李爱静 杜宝霞[1] 张明震 林少华 彭静 张静[1] 刘国龙 交巴顿珠 马国蓉 惠建国 LI Aijing;DU Baoxia;ZHANG Mingzhen;LIN Shaohua;PENG Jing;ZHANG Jing;LIU Guolong;JIAO-BA Dunzhu;MA Guorong;HUI Jianguo(Key Laboratory of Mineral Resources in Western China(Gansu Province),Lanzhou University,Lanzhou 730000,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]甘肃省西部矿产资源重点实验室,兰州大学,甘肃兰州730000 [2]中国科学院西北生态环境资源研究院,甘肃兰州730000

出　　处：《古地理学报》2023年第2期485-496,共12页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:42072014);第二次青藏高原综合科学考察研究(编号:2019QZKK0704);中央高校基本科研业务费项目(编号:lzujbky-2022-ey18);甘肃省优秀研究生“创新之星”项目(编号:2022CXZX-125)联合资助。

摘　　要：Podozamites(苏铁杉属)为松柏类已灭绝的形态属,是北半球中生代植物群中的重要分子。经鉴定,甘肃北山地区早白垩世早期地层中产出的Podozamites包括Podozamites sp.(苏铁杉未定种)、Podozamites aff.distans(间离苏铁杉相似种)和Podozamites bullus(美丽苏铁杉)3个种。基于Podozamites大化石记录和古地理分布特征,结合中生代古气候分区,对该属的古气候意义进行综合分析。结果表明:晚三叠世—中侏罗世,Podozamites数量较为丰富,主要集中分布于北半球温暖湿润气候区;晚侏罗世—早白垩世,随着干热气候带的扩张,Podozamites丰度下降,分布区域也随温热潮湿气候区变迁而发生迁移。推测Podozamites在中生代的古地理分布主要受到温暖潮湿气候带变迁的影响,其更加适宜生存于温暖湿润的气候条件下,可作为温暖湿润气候的指示分子。The extinct genus Podozamites belongs to conifers,and is an important component of the Mesozoic flora of the Northern Hemisphere.In this study,three species of Podozamites were reported from the Lower Cretaceous of the Beishan area,Gansu Province,China,including Podozamites sp.,Podozamites aff.distans and Podozamites bullus.On the basis of the global records and palaeogeographic distribution of the Podozamites species,as well as palaeoclimatic zones of the Mesozoic,the palaeoclimatic significance of this genus is addressed.The results show that Podozamites were more abundant and mainly distributed in warm and humid climate zones of the northern Hemisphere during Late Triassic to Middle Jurassic.The abundance of Podozamites declined,along with the expansion of arid climatic zones,and the distribution also migrated along with warm-humid climatic zones during the Late Jurassic to Early Cretaceous.The palaeogeographic distribution of Podozamites species was mainly influenced by shifts of warm-humid climatic zones during the Mesozoic.Podozamites might have been more adaptive to warm and moist conditions and thus can serve as an indicator genus of warm-humid climates.

关 键 词：早白垩世 北山地区 Podozamites 古气候意义 

分 类 号：Q914.5[天文地球—古生物学与地层学]