摘要
成吉思汗驿站龙江组剖面位于扎兰屯成吉思汗镇东南部,组内大化石稀少,但孢粉化石丰富,下部岩性为沉凝灰岩、凝灰岩、凝灰质砂岩、砂岩、砾岩,上部岩性为安山岩、英安岩。通过对成吉思汗驿站龙江组孢粉化石的分析,在龙江组中识别出圆形粒面孢-二连粉孢粉组合带(Cyclogranisporites-Erlianpollis)。通过对孢粉化石属种的分析,根据具有时代指示意义的孢粉化石,如Erlianpollis,Cicatricosisporites,Pilosisporites等,认为成吉思汗地区龙江组孢粉化石形成时代为早白垩世,结合地质、古植物及孢粉化石的定量分析,认为龙江组植被类型反映亚热带气候,指示温暖潮湿的环境。
Located in the southeastern Chenjisihan Town of Zhalantun area, the Longjiang Formation in the ChenjisihanYizhan contains abundant palynological fossils but rare macrofossils. The lithological assemblages of the lower Longjiang Formation are composed ainly of sedimentary tuff, tuff, sandstone and conglomerate, while those of the upper Longjiang Formation comprise predominantly ndesite and dacite. By analyzing the palynological fossils from the Longjiang Formation in the ChengjisihanYizhan area, the Cyclogranisporites-Erlianpollis pollen assemblage zone was recognized. Several palynological fossils, such as Erlianpollis, Cicatricosisporites nd Pilosisporites, indicate that the palynological fossils of the Longjiang Formation of Chengjisihan area formed in Early Cretaceous.In combination with geological characteristics and quantitative analysis of plant fossils and palynological fossils, vegetation species of the Longjiang Formation point to a subtropical climate and a warm and humid environment.
作者
秦涛
李林川
钱程
江斌
孙巍
那福超
马永非
臧延庆
QIN Tao;LI Linchuan;QIAN Cheng;JIANG Bin;SUN Wei;NA Fuchao;MA Yongfei;ZANG Yanqing(Shenyang Institute of Geology and Mineral Resources,Shenyang 110034,Liaoning,China;College of Earth Science,Jilin University,Changchun 130061,Jilin,China)
出处
《地质通报》
CAS
CSCD
北大核心
2018年第9期1571-1578,共8页
Geological Bulletin of China
基金
中国地质调查局项目<内蒙古1:5万五家户
孟家沟
莫力根屯
扎赉特旗
巴彦高勒五幅区域地质调查>(编号:DD20160048-03)
关键词
内蒙古扎兰屯地区
龙江组
孢粉组合
Zhalantun area
Inner Mongolia
Longjiang Formation
palynological assemblage
