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辽西义县组砖城子层孢粉组合时代及古气候记录

, PP. 1138-1152

Keywords: 孢粉组合,古气候,植被垂直分带,砖城子层,义县组

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Abstract:

?在辽西义县鹰窝山地区义县组砖城子层采样,通过对孢粉化石的处理、鉴定和分析,确认该孢粉化石组合为Cicatricosisporites-Protoconiferus组合(无突肋纹孢-原始松柏粉组合),组合当中以裸子植物花粉,尤其是松柏类双气囊花粉占绝对优势,蕨类植物孢子较少,有少量疑似被子植物花粉.孢粉组合时代为早白垩世凡兰吟晚期或欧特里夫期-巴列姆期.应用孢粉植被的概念,依据孢粉谱和孢粉类群的古生态特征,首次对辽西地区义县组砖城子层的植被类型、气候带类型、干湿度类型分别进行了定量划分,并得出演化趋势,结果显示,在辽西义县组砖城子层沉积时期,总体气候温暖湿润,植被类型多样,有针叶林、落叶阔叶林、常绿阔叶林、草丛、灌木等;局部气温变化趋势是从温暖向更温暖、气候从半湿润向湿润方向演化,植被类型始终以针叶林为主,落叶阔叶林、常绿阔叶林、草丛、灌木和一些旱生植物的共存说明可能有垂直分带现象,且气候变化有季节性.值得注意的是,从植被类型的垂直分带现象和气候温暖湿润来综合推断,辽西义县组沉积时期地貌反差可能很大.

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