干旱区生态环境知识资源中心(Arid): 开鲁盆地东北部钱家店凹陷晚白垩世姚家组孢粉组合及其古气候意义

Arid

	开鲁盆地东北部钱家店凹陷晚白垩世姚家组孢粉组合及其古气候意义
其他题名	Late Cretaceous Palynological Assemblage and Its Palaeoclimate Record from Yaojia Formation in Qianjiadian Depression,Kailu Basin
	徐增连 1; 魏佳林 1; 曾辉 1; 里宏亮 2; 李建国 1; 朱强 1; 张博 1; 曹民强 2
来源期刊	地球科学
ISSN	1000-2383
出版年	2017
卷号	42 期号:10 页码:1725-1735
中文摘要	对于开鲁盆地姚家组孢粉学的研究不仅丰富了该地区晚白垩世孢粉学资料,而且为该地区晚白垩世地层划分与对比提供了依据.通过对开鲁盆地钱家店凹陷钻孔QIV-48-61深315~447m井段的岩心做了详细采样、描述,并进行了孢粉化石的处理、鉴定和分析,在其中的10个层位中发现了丰富的孢粉化石,共计73属88种,并建立了3个孢粉组合,自下而上依次为 Schizaeoisporites-Cyathidites-Tricolpopollenites,Schizaeoisporites-Classopollis-Taxodiaceaepollenites和Schizaeoisporites-Exesipollenties-Tricolpopollenites,根据孢粉组合内一些重要分子的地质时限及与外区有关孢粉组合的对比,将其时代划归为晚白垩世Coniacian晚期-Santonian早期,其层位相当于姚家组.根据孢粉母体植物形态和生态特征、干湿度环境和气候环境,将其孢粉植物群反映的植被、干湿度和气候带划分为3个演化阶段:第1演化阶段(405.9~413.2m)沉积时期植被面貌大体为针叶林与草本共生,对应于湿润、半湿润的热带-亚热带气候;第2演化阶段(389.7~405.9m)植被面貌演化为以高大乔木型针叶树种占优势地位,并出现一次明显的干旱化事件,对应于半干旱的热带-亚热带气候;第3演化阶段(336.0~ 389.7m)植被面貌与第1阶段相似,为针叶林与草本共生,干旱化有所缓解,对应于半湿润-半干旱的热带-亚热带气候.
英文摘要	The study on the palynology from the Yaojia Formation can provide palynology data and lay the basis on Late Cretaceous stratigraphic classification and correlation in the northeastern area of Kailu basin.Abundant sporopollen fossils of 88species from 73 genera were recognized from the interval of 315to 447mof well QIV-48-61in the Qianjiadian depression,Kailu basin in this study. Three sporopollen assemblages are established,namely the Schizaeoisporites-Cyathidites-Tricolpopollenites assemblage,the Schizaeoisporites-Classopollis-Taxodiaceaepollenites assemblage and the Schizaeoisporites-Exesipollenties-Tricolpopollenites assemblage. According to the geological range of some important elements and the correlation with relevant assemblages of other areas,the geological era of these sporopollen assemblages is assigned to the Late Cretaceous,which is equal to the Late Coniacian-Early Santonian Stage. Based on ecological characteristics,climate and humidity condition for the vegetation type of the sporopollen from the Qianjiadian area, 3phases of paleovegetation and paleoclimate are reconstructed as follows.(1)It was humid/semi-humid tropic-subtropic climate during the interval of 405.9to 413.2m,presenting a vegetation landscape of coniferous forest and grass.(2)The vegetation type during the interval of 389.7to 405.9mwas characterized by the dominance of coniferous forest,and the climate turned hot and dry,marked by the increase in the drought-tolerant taxa,corresponding to semi-arid tropic-subtropic climate.(3)Similar to the first phase,the vegetation type during the interval of 336.0to 389.7mwas also coniferous forest including grass,which belonged to semi-humid and semi-arid tropic-subtropic climate.
中文关键词	孢粉组合 ; 古气候 ; 姚家组 ; 晚白垩世 ; 钱家店凹陷 ; 开鲁盆地 ; 古生物
英文关键词	palynological assemblage palaeoclimate Yaojia Formation Late Cretaceous Qianjiadian depression Kailu basin paleontology
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:6115741
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235786
作者单位	1.中国地质调查局天津地质调查中心, 天津 300170, 中国; 2.辽河石油勘探局新能源开发公司, 盘锦, 辽宁 124010, 中国
推荐引用方式 GB/T 7714	徐增连,魏佳林,曾辉,等. 开鲁盆地东北部钱家店凹陷晚白垩世姚家组孢粉组合及其古气候意义[J],2017,42(10):1725-1735.
APA	徐增连.,魏佳林.,曾辉.,里宏亮.,李建国.,...&曹民强.(2017).开鲁盆地东北部钱家店凹陷晚白垩世姚家组孢粉组合及其古气候意义.地球科学,42(10),1725-1735.
MLA	徐增连,et al."开鲁盆地东北部钱家店凹陷晚白垩世姚家组孢粉组合及其古气候意义".地球科学 42.10(2017):1725-1735.