蓟县高于庄组燧石中原位保存的单细胞微体化石新类型  

A New Type of Primary Unicellular Microfossils from the Chert of the Gaoyuzhuang Formation in Jixian County, Tianjin

作　　者：曹芳[1] 

机构地区：[1]中国地质调查局天津地质矿产研究所,天津300170

出　　处：《地球学报》2005年第6期547-551,共5页Acta Geoscientica Sinica

基　　金：中国地质调查局地质调查项目"冀北前寒武纪微体化石研究"(编号:200313000052)资助成果。

摘　　要：本文描述的化石产自天津市蓟县中、新元古界剖面长城系高于庄组(小红峪沟)一段,即官地亚组燧石条带中。其基本外形为两端浑圆的橡皮艇状,沿长轴方向具有一个贯通化石体的纵向开口,开口的大小约占标本宽度的1/3,以开口为界,化石体具有两侧对称特征。该类形态化石在蓟县剖面的报道尚属首次。文中就化石体的基本形态特征及产出特点与国内外相关化石进行了详细对比。另据标本所显示的规则的开口结构,推测其可能具有释放内生孢子的功能,因此视其为可能的真核生物。此外,笔者还就该层位化石种类单调,个体微小(8～17μm)等特征,结合官地亚组的沉积特点,探讨了化石的形成环境。The microfossils were found in the black chert from Gaoyuzhuang Formation of Middle Proterozoic Changcheng System in Jixian County. The fossil body assumes a pneumatic boat-like form, with both ends being perfectly round, and the length ranging commonly from 8 to 17 μm, 2 times as long as the width. There is a longitudinal slit that occupies 1/3 of the specimen width. The specimen is characterized by the symmetry of both sides, and the axis is the longitudinal slit. The longitudinal slit probably has the function of releasing endospore. From the complicated structure, it can be inferred that these organisms might be of eukaryote. The above-mentioned fossils have been reported for the first time from Gaoyuzhuang Formation of Middle Proterozoic Cbangcheng System in Jixian County.

关 键 词：长城系 高于庄组 单细胞微体化石 蓟县 中元古界 

分 类 号：P619.245[天文地球—矿床学] Q913.2[天文地球—地质学]