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安徽淮南元古代刘老碑组页岩中产出大量光面球形疑源类化石Leio-sphaeridia asperata.化石的膜壳直径为13~360μm,变动范围非常大.本文利用SEM和TEM技术观察其膜壳超微结构的特征,结果显示部分L.asperata标本的内表面具有微弱的棱状条纹,一些化石的膜壁具有明暗相间的条带,一类标本的膜壳具有“三明治”式结构(TLS),个别标本的膜壳同时具有明暗条带和TLS结构.通过与现生藻类进行对比,这些复杂的膜壁结构可能反映了与现生微体绿球藻类具有亲缘关系的真核藻类的不同生长阶段的结构特征,抑或表明真核藻类在元古代已经发生了较大的结构分异.
A large number of spheroidal diurnal fossils Leio-sphaeridia asperata are produced in the Liuyuandian shale of the Proterozoic Liuhuibian, Huainan, Anhui. The fossil shell has a diameter of 13 ~ 360μm with a very wide variation range. The SEM and TEM The results showed that some L.asperata specimens had weakly prismatic streaks on the inner surface and some fossilized membrane walls had a light-dark phase. The shell of one specimen had a “sandwich” structure (TLS), the shell of individual specimens has both light and dark bands and TLS structures.Compared with the live algae, these complex membrane wall structures may reflect the eukaryotic algae that are related to the protocorms The different growth stages of the structural characteristics, or that eukaryotic algae have taken place in the Proterozoic large structural differences.