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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>The Mn-Carbonate Rich Black Shales of the Bangombe Plateau, Francevillian Basin, Gabon</title>
<creator>DUBOIS, Manon</creator>
<creator>LOPEZ, Michel</creator>
<creator>Orberger, Beate</creator>
<creator>Rodriguez, Celine</creator>
<creator>Boussafir, Mohammed</creator>
<creator>Dreux, Geoffrey</creator>
<creator>Rodrigues, Sophie</creator>
<creator>Pambo, Florent</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) ; Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) - Institut national des sciences de l'Univers (INSU - CNRS) - Université d'Orléans (UO) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>COMILOG</contributor>
<source>13th Biennial SGA Meeting</source>
<coverage>Nancy, France</coverage>
<identifier>hal-01356155</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01356155</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01356155</source>
<source>13th Biennial SGA Meeting, Aug 2015, Nancy, France. pp.1905-1908, Mineral resources in sustainable world</source>
<language>en</language>
<subject lang=en>Rhodochrosite Kutnohorite</subject>
<subject lang=en>Dolomite</subject>
<subject lang=en>black shales</subject>
<subject lang=en>Proterozoic</subject>
<subject lang=en>Gabon</subject>
<subject lang=en>Organic matter</subject>
<subject>[SDU.STU.MI] Sciences of the Universe [physics]/Earth Sciences/Mineralogy</subject>
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<type>Conference papers</type>
<description lang=en>Eight drill cores cutting through the Mn-carbonate bearing black shales from the Bangombé Plateau were studied. Mn-carbonates (up to 80 m thick) are underlain by laminated pyrite rich shales with organic carbon contents of about 4 wt. % and MnO contents of about 6 wt. %. Mn and Fe, S poor shales are intercalated. Mn-carbonate rich shales (20-29 wt. % MnO) have low contents of phyllosilicates, but are rich in organic carbon (about 7 wt. %) with moderate S contents (about 2 wt. %). All shale facies were deposited in a closed basin through suspension settling and precipitations under anoxic conditions. The Mn-carbonates, towards the top, were formed most likely under suboxic conditions. Pyrite and Mn-carbonates are characterized by bacteriomorphous structures. The latter are composed of micrometric carbonates finely intergrown with clays, quartz and organic matter. They formed around and corroded the dolomite and/or organic matter. Mn-carbonates and pyrite both form also several tenths of micrometer large agglomerates and sub-automorphous grains. The agglomerates can be attributed to evolving diagenesis. Carbonate chemistry varies mainly from rhodochrosite to dolomite. The present results point to primary microbial Mn-carbonate formation. No signs for a Mn-oxide precursor were detected. Slumping and shearing structures, distortion and disruption of thin pyrite beds indicate synsedimentary deformations.</description>
<date>2015-08-24</date>
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