Journal of Geology & Geophysics
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Ortega R

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• Research Article
  An Akouemma hemisphaeria Organic Macrofossils Colony Hosting Biodiversity Assemblage on the Seafloor of Okondja Basin (Gabon) dated at 2.2 Ga
  Author(s): Edou-Minko A, Moussavou M, Sato T, Tchikoundzi C, Sawaki Y, Ndong Ondo S, Ortega R, Maire R, Kaestner A, Mbina Mounguengui M, Roudeau S, Fleury G, Carmona A, de Parseval PH, Makaya Mvoubou, Musavu Moussavou B, Ogandaga Agondjo M, Sasaki O and Maruyama SEdou-Minko A, Moussavou M, Sato T, Tchikoundzi C, Sawaki Y, Ndong Ondo S, Ortega R, Maire R, Kaestner A, Mbina Mounguengui M, Roudeau S, Fleury G, Carmona A, de Parseval PH, Makaya Mvoubou, Musavu Moussavou B, Ogandaga Agondjo M, Sasaki O and Maruyama S
  
  A colony of silico-carbonate Akouemma nodules found in Akou River sedimentary formations of the Palaeoproterozoic Okondja Basin consists of two groups, spheroidal (ovoid) nodules and elongated nodules. These nodules, which consist of two hemispheres separated by a median disc, are composed essentially of micro-quartz associated with calcite of extra-polymeric substance (EPS) type, clay minerals, organic carbon and oxides and sulphides of iron. They contain tubular microfossils, pluricellular clusters, microorganisms and vesicles, and have undergone considerable deformation by mutual lateral compression in tabular beds. They were interpreted as biogenic nodules hosting microorganisms. We provide the following additional supporting evidence: Akouemma nodules exhibit internal fibro-radial fabrics initially composed of fibres and carbon particles; the initially.. View More»
  DOI: 10.4172/2381-8719.1000281

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