甘肃侏罗纪植物化石Ginkgo huttonii角质层地球化学特征  

Geochemical Characteristics of the Fossil Ginkgo huttonii Cuticles from the Jurassic in Gansu, China

作　　者：石亚军[1] 孙柏年[1] 张成君[1] 阎德飞[1] 

机构地区：[1]兰州大学资源环境学院西部环境教育部重点实验室,730000

出　　处：《地质学报》2005年第3期289-294,共6页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号49972013;40372012);教育部科学技术研究重点项目(编号104177);甘肃省自然科学基金项目(编号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基金项目(编号OGL-9907);兰州大学交叉学科青年创新研究基金项目(

摘　　要：对甘肃民和盆地侏罗纪植物化石Ginkgohuttonii(Sternb.)Heer的角质层与现生银杏Ginkgobiloba的角质层进行了地球化学特征对比分析,结果表明植物化石角质层有机物特征符合石油形成中沥青的演化特点。通过有机物组分含量分析,它们相当于中国中、新生代油源岩有机质类型中的腐泥型—腐殖腐泥型。对烃组分三角图进行投点,落入II型干酪根范围内。通过有机质中的一些指标分析,发现Ginkgohuttonii的角质层处于低成熟阶段,与煤中显微组分角质体的成烃模式基本一致。另外,角质层的可溶有机质分布特征表明,植物化石角质层对陆相高蜡原油的形成有一定的作用,证明高等植物对蜡质有贡献。当前研究及古植物学资料表明,银杏是一种有利于煤成油的植物。A comparison analysis of geochemical characteristics was made on cuticles of Jurassic fossil Ginkgo huttonii from the Minhe Basin in Gansu and extant Ginkgo biloba leaves in Lanzhou. The result shows that the characteristics of organic matter of the fossil cuticles accords with evolutional features of asphaltum in oil formations. Analysis on the content of organic matter indicates that they are equivalent to organic matter of the sapropelic-humic type in the Mesozoic and Cenozoic source rocks in China. In a triangular diagram of the hydrocarbon content, they fall into the field of the Ⅱ type kerogen. Some analysis data of organic matter indicate that Ginkgo huttonii cuticles are in a low-mature phase, which coincides with the hydrocarbon-generating model of micromatter cutinite in coal. Besides, distribution features of soluble organic matter of cuticles show that fossil plant cuticles have a definite effect on the formation of high-wax terrestrial oil, suggesting a significant contribution of higher plants to wax. The present study and palaeobotanic materials prove that Ginkgo has a high potential to form oil from coal.

关 键 词：地球化学特征 植物化石 角质层 侏罗纪 甘肃 有机质类型 可溶有机质 民和盆地 对比分析 演化特点 石油形成 含量分析 指标分析 成熟阶段 成烃模式 显微组分 高蜡原油 高等植物 古植物学 有机物 油源岩 新生代 三角图 烃组分 

分 类 号：Q914.2[天文地球—古生物学与地层学]