Journal of Geology & Geophysics
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Ogandaga Agondjo M

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• Research Article
  Multicellular Consortia Preserved in Biogenic Ductile-Plastic Nodules of Okondja Basin (Gabon) by 2.1 Ga
  Author(s): Moussavou M, Edou-Minko A, Mbina Mounguengui M, Ortega R, Fleury G, Roudeau S, Carmona A, Genty D, Blamart D, Tchikoundzi C, Makaya Mvoubou, Musavu Moussavou B, Ndong Ondo S, Ogandaga Agondjo M, Dewilde F, Delorme G, de Parseval Ph, Weil R and Maire R Moussavou M, Edou-Minko A, Mbina Mounguengui M, Ortega R, Fleury G, Roudeau S, Carmona A, Genty D, Blamart D, Tchikoundzi C, Makaya Mvoubou, Musavu Moussavou B, Ndong Ondo S, Ogandaga Agondjo M, Dewilde F, Delorme G, de Parseval Ph, Weil R and Maire R
  
  We highlight complex ductile nodules found in the FB2 formation of the Okondja francevillian Basin (Gabon) dated to 2.1 Ga, during the Great Oxygenation Event (GOE). More than 500 specimens were collected from unmetamorphosed pelites in an excellent state of preservation. These nodules are divided into two groups: globular and elongated forms, one to three cm in diameter and over six cm long along the axis of elongation. They are characterized by two hemispheres separated by a central zone. They have a remarkable radial structure in spheroidal forms, and often have a polyphased structure in elongated forms. Chemical and microscopic analyses indicate that these nodules are formed over 80% of a fabric of micro-quartz, fossilizing calcite grains (rounded grains and remnants of biofilms) and clay channels. These slightly pyritized nodules also contain iron in the form of hematite and goet.. View More»
  DOI: 10.4172/2329-6755.1000195

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