湖南石门晚震旦世微叠层石的发现  

LATE SINIAN MICROSTROMATOLITES FIRST DISCOVERED FROM SHIMEN,HUNAN

作　　者：曹瑞骥[1] 俞从流[1] 

机构地区：[1]中国科学院南京地质古生物研究所,南京210008

出　　处：《微体古生物学报》1991年第4期365-371,485-488,共7页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金会资助

摘　　要：一种只有在显微镜下才能观察到的微叠层石首次发现于湖南石门杨家坪震旦系灯影组中都含磷岩系中。当前的微叠层石均为断开的柱体,未观察到其原始的生长形态。现存柱体根据形态特征可分为直立和弯曲两类。这些柱体与含蓝藻衣鞘的岩屑和似软舌螺碎片一道,以内碎屑形式分布在硅化的粒状灰岩或泥粒状灰岩中。生态资料暗示,当前发现的微叠层石可能生长在潮坪的水塘环境。The microstromatolites reported in this paper were collected from thephosphorite-bearing beds in the middle part of the Sinian Tongying Formation in theYangjiaping area, Shimen County, Hunan Province. A microstromatolite is a very smallstromatolite recognized only under a microscope, with a columnar width measured inmicrons. The microstromatolitic columns under study occur in grainstone or packstonepartially or completely silicified in the form of intraclasts. Other bioclasts also occur in thesame silicified grainstone or packstone in the form of intraclastic constituents, such as tubu-lar cyanobacterial clasts and fragments of hyolithelmithes.

关 键 词：微叠层石 叠层石 晚震旦世 湖南 

分 类 号：Q913.631[天文地球—古生物学与地层学]