甘肃华亭中侏罗统延安组植物群组成及古气候指示

发布时间：2018-05-19 08:28

本文选题：植物化石 + 古气候　；参考：《古生物学报》2017年01期

【摘要】：对甘肃华亭延安组植物化石进行了宏观形态和表皮构造分析,经鉴定共有24属49种。该植物群组成为:真蕨纲(28.6%)、银杏纲(38.8%)繁盛,松柏纲(16.3%)、楔叶纲(8.2%)和苏铁纲(4.1%)占一定比例,石松纲和种子蕨纲未见。与国内、外侏罗纪植物群或组合,特别是与我国北方中侏罗世11个研究较为系统的植物群进行了详细的对比和分析。结果表明,当前植物群明显具有中国北方Coniopteris-Phoenicopsis植物群早期组合的特点,其地质时代归为中侏罗世早期,大致相当于阿林期(Aalenian)至巴柔期(Bajocian)。华亭延安组化石植物以温暖湿润气候下繁盛的植物类型为主,兼具少数亚热带、热带气候下的植物成分,说明甘肃华亭地区中侏罗世为偏湿润的暖温带气候。
[Abstract]:The macromorphology and epidermal structure of plant fossils of Yanan formation in Huating County Gansu Province were analyzed. A total of 49 species belonging to 24 genera were identified. The plant groups are: Adipteris 28.6i, Ginkgo 38.8) flourishing, Pine and cypress 16.3g, Cycas 8.2cm) and cycads 4.1. not found in Pine and Dryopteris. It is compared and analyzed in detail with the flora or assemblages of the outer Jurassic in China, especially with the 11 systematic studies of the Middle Jurassic in the north of China. The results show that the present flora has the characteristics of early assemblage of Coniopteris-Phoenicopsis flora in North China, and its geological age is classified as the early Middle Jurassic, which is approximately equivalent to the Aalenianian period from Arlene to Bajociantii in Bajocianhe. The fossil plants of the Huating Yan'an formation are dominated by plant types that flourish in warm and humid climates, and have a few plant components in subtropical and tropical climates, indicating that the middle Jurassic warm temperate climate in Huating region, Gansu Province, is slightly moist.
【作者单位】：兰州大学地质科学与矿产资源学院;
【基金】：国家自然科学基金(41402008,41302009) 甘肃省自然科学基金(1506RJZA210) 中央高校基本科研业务费(lzujbky-2016-20) 国家级大学生创新项目(201510730132)联合资助
【分类号】：Q914;P532

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