摘要
通过对甘肃窑街中侏罗统窑街组化石银杏以及现代银杏角质层有机质组分和碳同位素组成分析,表明银杏角质层有较强的抗风化能力,化石和现代银杏角质层有机质烷烃和甾萜类化合物组成十分相似。可以通过角质层的碳同位素组成等参数进行古环境重建,结果表明中侏罗世早期古环境较为温湿,到了中期后古气候逐渐变得干旱少雨,后期降雨量又逐渐增加,温度升高,植被发育。
Fossil in the Middle Jurassic Yaojie Formation, Yaojie, Gansu and modern Ginkgo cuticle organic components and organic carbon isotopic composition have been analysed in this paper. It's shown that Ginkgo cuticles have a high chemical resistance towards weathering and there is a similar alkanes and terpenes and steroids components between fossil and modern Ginkgo cuticles. Paleoenvironment can be reconstructed by using carbon isotopic compositions and other parameters of Ginkgo cuticles. The result can be made that paleoenvironment was warm and wet in the early, and became gradually arid and little rain after middle period, and then rainfall and temperature increased, vegetation developed in the late of Middle Jurassic series.
出处
《西北地质》
CAS
CSCD
2004年第2期42-47,共6页
Northwestern Geology
基金
国家自然科学基金(49972013
40372012)
甘肃省自然科学基金(ZS031-A25-002-Z)
中国科学院广州地球化学研究所有机地球化学国家重点实验室项目(OGL-9907)共同资助.
