甘肃省宝积山晚三叠世植物群与古地理研究  

Study on Upper Triassic Flora and Paleaogeography in Baojishan,Gansu Province

作　　者：阎同生[1] 

机构地区：[1]河北师范大学资源与环境学院,河北石家庄050016

出　　处：《地理与地理信息科学》2006年第1期103-108,共6页Geography and Geo-Information Science

摘　　要：晚三叠世地层是我国西北的主要产煤产油地层,对甘肃省宝积山晚三叠世植物群及古地理进行研究,发现植物群31属56种。其中真蕨类植物7属16种,有节类植物4属10种,种子蕨类植物2属2种,苏铁类植物5属7种,银杏类植物6属13种,松柏类植物2属3种,裸子植物种子化石3属3种,分类位置不明化石2属2种,发现了多实拟丹尼蕨和蔡耶贝尔瑙蕨两种北方植物群的典型代表。植物生态类型主要为滨岸、高地和低地。依据纵向分布特点,可将宝积山植物群划分为多实拟丹尼蕨(Danaeopsis fecunda)—周氏似银杏(Ginkgoites chowi)和巨大枝脉蕨(Cladophlebiscf.gigantea)—蟹形新芦木(Neocalamites carcinoides)两个组合带。当时的古气候应为亚热带,通过对沉积物分析确定古环境出现过多次变化,将上三叠统划分为5个古地理演化阶段,可与邻区进行对比。The fossil plants studied in this paper, were collected from the upper Triassic stratum of Baojishan coalmine in Ganau Province. This flora was composed of 56 species in 31 genera,including Filicopsida of 16 species in 7 genera,Cycadopsida of 7 species in 5 genera,Ginkgopsida of 13 species in 6 genera,Coniferae of 3 species in 2 genera, Spermatophyta of species in 2 genera, Sphenopsida of 10 species in 4 genera, and Fructus et Semlna of 3 species in 3 genera. Many plants had the characteristics of Danaeopsis - Bernoullia flora belonging to north provinces of China,but some species of south provinces in China were also found in this flora. The types of ecology in this flora could be divided into lakeshore flora, high land flora and low land flora. The flora could be divided into two assemblages in vertical section, The upper assemblage was Danaeopsis fecunda - Ginkgoites chowi, the under assemblage was Cladophlebis cf. gigantean - Neocalamites carcinoides. The study showed the ancient climate belonged to sub-tropic climate,by the analysis of sediment, it was confirmed that the ancient environment appeared change many times. The upper Trias could be divided to five evolvement stages and could be contrasted with the neighbour regions.

关 键 词：甘肃宝积山 晚三叠世 古植物群 

分 类 号：P531[天文地球—古生物学与地层学]