开鲁盆地钱家店凹陷早白垩世义县组孢粉组合及其古气候演变  

Early Cretaceous spore and pollen assemblage from the Yixian Formation in the Qianjiadian Depression of Kailu Basin and its paleoclimate evolution

作　　者：徐增连 李建国 朱强 里宏亮 曾辉 魏佳林 张博 曹民强[4] 洪波 XU Zenglian;LI Jianguo;ZHU Qiang;LI Hongliang;ZENG Hui;WEI Jialin;ZHANG Bo;CAO Minqiang;HONG Bo(Tianjin Centre,China Geological Survey,Tianjin 300170,China;Key Laboratory of Uranium Geology,China Geological Survey,Tianjin 300170,China;Core and Samples Center of Land and Resources,China Geological Survey,Sanhe 065201,Hebei,China;Development Company of New Energy Sources of Liaohe Petroleum Exploration Bureau,CNPC,Panjin 124010,Liaoning,China)

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]中国地质调查局铀矿地质重点实验室,天津300170 [3]自然资源实物地质资料中心,河北三河065201 [4]辽河石油勘探局新能源开发公司,辽宁盘锦124010

出　　处：《中国地质》2021年第6期1924-1934,共11页Geology in China

基　　金：国家重点研发计划(2018YFC0604200);中国地质调查局项目(DD20190121)共同资助。

摘　　要：研究白垩纪植物演替与气候变化对认识现今生态环境形成过程与演变具有重要意义。开鲁盆地义县组孢粉学的研究不仅丰富了该地区早白垩世孢粉学资料,也为该地区早白垩世地层划分与对比提供了依据。通过对开鲁盆地东北部钱家店凹陷钻孔QIV−65−136底部泥岩样品分析,获得了丰富的孢粉化石,并建立了Cyathidites−Pinuspollenites−Protoconiferus组合。根据典型分子时代分布、重要种属含量上的变化及横向组合对比,确定其地质时代为早白垩世早期,层位相当于义县组。孢粉植物群反映的植被景观为在湖盆的周围山地生长着松科高大乔木,伴有罗汉松科、杉科及少量苏铁科、南美杉科、掌鳞杉科等植物,林下、湖岸地区生长着桫椤科、紫萁科及莎草蕨科等蕨类植物。整体面貌以针叶植物为主,所处的气候环境为湿润的暖温带—亚热带。The study of plant succession and climate change in Cretaceous is of great significance for the understanding of formation and evolution of the present ecological environment. The study on the palynology from the Yixian Formation can provide palynology data and lay the basis on Early Cretaceous stratigraphic classification and correlation in the northeastern area of Kailu basin. Based on the analysis of sporo-pollen fossils of 47 species from 39 genera recognized from the bottom of well QIV-65-136 in the Qianjiadian depression, Kailu Basin, the Cyathidites-Pinuspollenites-Protoconiferus assemblage was established. According to the age range of typical species, content change on key species and horizontal contrast, this assemblage should be dated as the early Early Creataceous, the horizon is equivalent to the Yixian Formation. The palynoflora shows the Coniferales plants on the high elevation mountain around the lake, accompanied by Podocarpaceae, Taxodiaceae, Cycadaceae, Araucariaceae and Cheirolepidiaceae plants, the fern such as Osmundaceae, Cyatheaceae, Schizaeaceae plants growing under the trees near the lake.Vegetation is occupied by coniferous, representing a humid temperate to subtropical zone.

关 键 词：早白垩世 义县组 孢粉组合 古气候 矿产勘查工程 开鲁盆地 钱家店凹陷 辽宁 

分 类 号：P52[天文地球—古生物学与地层学]