作　　者： ; ; ; ; ;

机构地区： 兰州大学资源环境学院

出　　处： 《西北地质》 2004年第2期42-47,共6页

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.

关 键 词： 甘肃窑街 中侏罗统 窑街组 化石银杏角质层 有机质组分 碳同位素组成 古环境

领　　域： [天文地球] [天文地球]