France Champenois, Annette D. George, Kenneth J. McNamara, Jeremy Shaw, Maria Cherdantseva
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These ferromanganiferous dendrites have laminated to spheroidal textures. Types II and III are from a toe-of-slope hardground. Type II grew in a crypt between two corals, is also dendritic and composed of bacilliform and filamentous bacteria embedded in an amorphous EPS sheet. The opaqueness of these ferriferous dendrites precludes more detailed description of textures. Type III grew as branching columnar microstromatolites and is composed of entwined filaments of <i>Girvanella</i>, <i>Rothpletzella</i> and <i>Wetheredella</i> with Fe-enriched outer walls that generate <i>Frutexites</i>-like microstructures. Types I and II resemble <i>Frutexites</i> sensu stricto as defined by Maslov (<i>Stromatolites</i>, Trudy Instituta geologicheskikh nauk Akademiya nauk SSR, 1960) and are the result of the consecutive growth and permineralisation of biofilms composed of mixed bacterial communities growing in cryptic habitats. 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引用次数: 0
摘要
从西澳大利亚坎宁盆地北部出土的晚泥盆世礁群中描述了类似frutexites的微观结构。几种高分辨率成像技术,包括x射线微电脑断层扫描、扫描电子显微镜和x射线荧光显微镜,用于研究两个样品的形态和组成。已鉴定出三种类型的类frutexite微结构(I-III型)。I型在礁前颗粒岩相早期海相水泥充填的空腔中发现,由树突结构组成,主要由球状细菌形成,丝状细菌嵌入无定形细胞外聚合物(EPS)片中。这些含铁枝晶呈层状,呈球状结构。类型II和III来自坡脚硬地。II型生长在两种珊瑚之间的隐窝中,也是树突状的,由嵌入无定形EPS片中的杆菌状和丝状细菌组成。这些含铁枝晶的不透明性妨碍了对其结构进行更详细的描述。III型为分枝柱状微叠层石,由Girvanella, Rothpletzella和Wetheredella的缠绕细丝组成,具有富铁的外壁,产生类似frutexites的微观结构。I型和II型类似Maslov定义的Frutexites sensu stricto (Stromatolites, Trudy Instituta geologicheskikh nauk Akademiya nauk SSR, 1960),是由生长在隐秘栖息地的混合细菌群落组成的生物膜连续生长和过矿化的结果。III型从宏观上看类似于Frutexites sensu stricto,但详细的微观分析表明,它是由富铁的管状壁包围富锰方解石组成的。
Contrasting morphology and growth habits of Frutexites in Late Devonian reef complexes of the Canning Basin, northwestern Australia
Frutexites-like microstructures are described from the exhumed Late Devonian reef complexes of the northern Canning Basin, Western Australia. Several high-resolution imaging techniques, including X-ray microcomputerised tomography, scanning electron microscopy and X-ray fluorescence microscopy, were used to investigate morphology and composition in two samples. Three types of Frutexites-like microstructures (Types I–III) have been identified. Type I, found lining an early marine cement-filled cavity in fore-reef grainstone facies, consists of dendritic structures formed primarily of coccoid bacteria with filamentous bacteria embedded in sheets of amorphous extracellular polymeric substances (EPS). These ferromanganiferous dendrites have laminated to spheroidal textures. Types II and III are from a toe-of-slope hardground. Type II grew in a crypt between two corals, is also dendritic and composed of bacilliform and filamentous bacteria embedded in an amorphous EPS sheet. The opaqueness of these ferriferous dendrites precludes more detailed description of textures. Type III grew as branching columnar microstromatolites and is composed of entwined filaments of Girvanella, Rothpletzella and Wetheredella with Fe-enriched outer walls that generate Frutexites-like microstructures. Types I and II resemble Frutexites sensu stricto as defined by Maslov (Stromatolites, Trudy Instituta geologicheskikh nauk Akademiya nauk SSR, 1960) and are the result of the consecutive growth and permineralisation of biofilms composed of mixed bacterial communities growing in cryptic habitats. Type III superficially resembles Frutexites sensu stricto based on macroscopic field observations, however, detailed microscopic analysis reveals that it is composed of Fe-enriched tubular walls surrounded by Mn-enriched calcite.
期刊介绍:
The field of geobiology explores the relationship between life and the Earth''s physical and chemical environment. Geobiology, launched in 2003, aims to provide a natural home for geobiological research, allowing the cross-fertilization of critical ideas, and promoting cooperation and advancement in this emerging field. We also aim to provide you with a forum for the rapid publication of your results in an international journal of high standing. We are particularly interested in papers crossing disciplines and containing both geological and biological elements, emphasizing the co-evolutionary interactions between life and its physical environment over geological time.
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Origins and evolution of life
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Microbe-mineral interactions
Biomarkers
Molecular ecology and phylogenetics.