龙江盆地西缘中侏罗世孢粉植物群及其对古气候的指示  

The Middle Jurassic palynoflora and its implication for paleoclimate in the western margin of Longjiang Basin

作　　者：张渝金[1] 杨雅军[1] 梁飞[2] 吴新伟[1] 张超[1] 付俊彧[1] 汪岩[1] 张淑芹[3] 刘淼[1] 丁秋红[1] 张德军[1] ZHANG Yujin;YANG Yajun;LIANG Fei;WU Xinwei;ZHANG Chao;FU Junyu;WANG Yan;ZHANG Shuqin;LIU Miao;DING Qiuhong;ZHANG Dejun(Shenyang Center,China Geological Survey,Shenyang 110034,Liaoning,China;College of Paleontology,Shenyang Normal University,Shenyang 110034,Liaoning,China;Research Center of Paleontology and Stratigraphy,Jilin University,Changchun 130026,Jilin,China)

机构地区：[1]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [2]沈阳师范大学古生物学院,辽宁沈阳110034 [3]吉林大学古生物学与地层学研究中心,吉林长春130026

出　　处：《地质通报》2021年第6期905-919,共15页Geological Bulletin of China

基　　金：国家自然科学基金项目《大兴安岭中段龙江盆地中侏罗统地层新研究》(批准号:41702032);《黑龙江嘉荫晚白垩世永安村组植物群及其地层对比》(批准号:41602015);中国地质调查局项目《内蒙古1:5万老房身等五幅区域地质调查》(编号:DD20190039-06);《内蒙古1:5万南燕窝沟等四幅区调》(编号:12120113053900);《地质调查综合智能编图系统与应用》(编号:DD20190415);《国家地质数据库建设与整合》(编号:DD20160351);《全国陆域及海区地质图件更新与共享》(编号:DD20190372);《中国及邻区海陆大地构造研究和相关图件编制》(编号:DD20179402)。

摘　　要：对产于龙江盆地中侏罗统万宝组含煤地层中的孢粉化石进行了系统研究,共识别出中侏罗世孢粉化石45属73种,蕨类植物孢子15属16种,裸子植物花粉30属57种,自下而上建立了Alisporites-Chasmatosporites-Cyclogranisporites,Chasmatosporites-Piceites-Cyclogranisporites及Cyclogranisporites-Baculatisporites-Protopinus 3个孢粉组合。该孢粉植物群以裸子植物花粉占优势,蕨类孢子次之,其中,裸子植物花粉以松柏类植物的双囊花粉和苏铁类、本内苏铁类、银杏类植物的单沟花粉为主。通过对龙江盆地万宝组孢粉植物群的组成分析,其时代应为中侏罗世。结合对该地质时期的植物群生态环境的研究,万宝组孢粉植物群反映了由半湿润到湿润的暖温带-亚热带的气候特点,并存在一定低矮山地的古环境。Based on the systematic analysis of palynological fossils collected from the coal-bearing strata of the Middle Jurassic Wanbao Formation in the Longjiang Basin, totally 73 species of 45 genera, including 16 species of 15 genera in pteridophyte spores and 57 species of 30 genera in gymnosperm pollen were recognized in the Longjiang Basin, and 3 palynological assemblages Alisporites-ChasmatosporitesCyclogranisporites, Chasmatosporites-Piceites-Cyclogranisporites and Cyclogranisporites-Baculatisporites-Protopinus assemblage were established in the Middle Jurassic strata in ascending order. The palynoflora is dominated by gymnospermous pollen, followed by fern spores.In addition, the pollen of gymnosperms is mainly composed of the bisaccate pollen of conifers and monosulcate pollen of cycads,bennettitales and ginkgophytes.Based on the analysis of palynological data, the age of the Wanbao Formation in the Longjiang Basin should be assigned to the Middle Jurassic.Combined with the features of the ecological environment, the Middle Jurassic Wanbao palynoflora may reveal a subhumid to humid warm temperate-subtropical climate with a certain paleoenvironment of low mountains.

关 键 词：孢粉化石 中侏罗世 古气候 古环境 龙江盆地 

分 类 号：P534.52[天文地球—古生物学与地层学] Q913.84[天文地球—地质学]