摘要
分析了窑街盆地中侏罗世孢粉化石,建立了窑街盆地中侏罗世的孢粉组合．其基本特征为: 绀合中以裸子植物花粉占优势,约占64．3％-72．1％;蕨类植物孢子次之,占27．9％-35．7％,蕨类孢子以Cyathidites,Deltoidospora等为主;裸子植物花粉中双气囊的松柏类花粉最丰富．进一步明确了窑街组的地层时代,探讨了窑街盆地的古植被、占气候及古地理演化特征．
With primary analysis of middle Jurassic sporo-pollen assemblage from Yaojie Basin in Gansu Province, zone of Cyathidites-Neoraistrickia-Piceaepollenite/Quadraeculuna （CNP/Q） is constructed and its characters are as follows： The pollen of gymnosperm in which disaccate pollen of coniferales is most abundant is the dominant type in CNP assemblage zone （64.3%～72.1%）. The spores of fern take the second place （27.9%～35.7%） which is mainly composed of Cyathidites and Deltoidospora et. Of them, Cyathidites minor is the dominant type. The geological age of Yaojie formation is proved, and paleovegetation and paleoclimate of Yaojie Basin are also discussed.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第3期8-13,共6页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金项目(40372012)教育部科学技术研究重点项目(104177)甘肃省自然科学基金项目(ZS031-A25-002-Z)西北师范大学青年教师科研基金项目(NWNU-QN-04-32)资助.
关键词
孢粉组合
古环境
甘肃窑街
中侏罗世
sporo-pollen assemblage
paleoenvironment
Yaojie
middle Jurassic period
