新疆哈密三道岭中侏罗蕨类植物及古气候意义

Middle Jurassic Ferns and Paleoclimatic Significance in Sandaoling,Hami,Xinjiang

哈密三道岭地区地层发育,富含大型植物化石,可以为古植物标本的鉴别和古气候研究提供丰富的资料,本文选取新疆哈密的侏罗纪锥叶蕨属大化石作为研究对象,鉴别了9块植物化石,根据化石特征、与其他类型研究的对比,详细描述了根、茎和叶片长度以及营养叶和生殖叶的形态,通过与已经发现的植物化石类型对比,得出此次鉴定化石的类型为锥叶蕨,由此分析了古气候和埋藏学意义。研究表明蚌壳蕨科进化缓慢,结合现生蚌壳蕨科均生长在水边,推导出研究区的气候环境是较为湿润的,而且周围存在水体;采取的研究区化石保存较为完整,能明显地观察到根、茎和叶等结构,推断出化石应该属于亚原地埋藏,经历了少量的搬运。

The Sandaoling area of Hami is well-developed and rich in large plant fossils,which can provide rich data for the identification of ancient plant specimens and paleoclimate studies.This paper selects the large fossils of Jurassic conophyllum from Hami,Xinjiang as the research object.9 plant fossils,according to the characteristics of the fossils and comparison with other types of studies,detailed descriptions of the length of roots,stems and leaves,as well as the morphology of vegetative leaves and reproductive leaves.The identification is obtained by comparing with the types of plant fossils that have been discovered.The type of fossil is conophyllum fern,which analyzes the significance of paleoclimate and burial science.Studies have shown that the evolution of clamaceae is slow,combined with the existing clamaceae growing near the water,it is inferred that the Sandaoling area in the Middle Jurassic was warm and humid,and there must be lakes or rivers;the study area adopted.The fossils are relatively intact,and the roots,stems,and leaves can be clearly observed.It is inferred that the fossils should be buried in sub-situ and have undergone a small amount of transportation.