0000000000087930

AUTHOR

Claude Censier

showing 4 related works from this author

La formation glaciaire de la Mambéré (République Centrafricaine) : reconstitution paléogéographique et implications à l'échelle du Paléozoïque africa…

1992

L'analyse stratigraphique et sedimentologique de la Formation de la Mambere, unite horizontale situee dans l'Ouest et le Sud-Ouest de la Republique Centrafricaine, a apporte des arguments en faveur de l'origine glaciaire des depots; une reconstitution paleogeographique a ete esquissee en vue de preciser l'âge de la formation. Deux grandes categories de depots glaciaires ont ete identifiees: L'origine meridionale du materiel detritique est demontree par l'analyse exoscopique des quartz et l'etude des mineraux lourds. Ce materiel provient essentiellement du demantelement du Complexe Schistoquartzitique precambrien, et accessoirement du Complexe Granito-gneissique. D'apres les trajectoires du …

ANALYSE DE CORRESPONDANCEANALYSE FACTORIELLEGeneral Earth and Planetary SciencesLITHOLOGIESTRATIGRAPHIEFORMATION SUPERFICIELLESEDIMENTOLOGIEPALEOZOIQUEHumanitiesGeologyMINERALPALEOGEOGRAPHIE
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Sedimentary processes in the Carnot Formation (Central African Republic) related to the palaeogeographic framework of Central Africa

1999

Abstract The depositional environment, provenance and processes of emplacement of the detrital material of the Mesozoic Carnot Formation are defined, by bedding and sedimentological analysis of its main facies, and are reconstructed within the palaeogeographic framework of Central Africa. The clastic material was laid down between probably the Albian and the end of the Cretaceous, in a NNW-oriented braided stream fluvial system that drained into the Doba Trough (Chad) and probably also into the Touboro Basin (Cameroon). The material was derived from weathering of the underlying Devonian–Carboniferous Mambere Glacial Formation and of the Precambrian schist–quartzite complex located to the so…

Sedimentary depositional environmentPaleontologyProvenancePrecambrianHeavy mineralStratigraphyClastic rockFaciesGeologySedimentary rockGeologyCretaceousSedimentary Geology
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Mise en évidence de corps d'origine cosmique probable au sein de la formation de Carnot (République Centrafricaine)

1992

Resume Deux etudes realisees independamment l'une de l'autre, ont permis de mettre en evidence, au sein de la Formation de Carnot, formation fluviatile mesozoique, d'une part des spherules magnetiques recuperees dans les residus d'un forage (zone de Boyali), d'autre part une anomalie magnetique tres localisee (sur 270 metres de long) traduisant la presence d'un corps decametrique a forte magnetisation remanente (zone de Gambondo). Ces deux elements magnetiques ont une origine cosmique probable. Ils correspondent a des micrometeorites et a une meteorite ayant atteint l'ouest de la Republique Centrafricaine entre l'Albien et le Maastrichtien.

ProvenanceSPHERULE MAGNETIQUEFORMATION DE CARNOTMETEORITEGeochemistryCentral africaPETROLOGIEConglomerateMINERALOGIECOMPOSITION CHIMIQUEMeteoriteANOMALIE MAGNETIQUEClastic rockSedimentary rockMesozoicMagnetic anomalyGeology
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Characteristics of Mesozoic fluvio-lacustrine formations of the western Central African Republic (Carnot Sandstones) by means of mineralogical and ex…

1990

Abstract The so-called Carnot Sandstones, Mesozoic fluvio-lacustrine detrital formation, which stretch over an area of more than 40 000 km 2 in the western part of the Central African Republic, are made of a succession of conglomerates, sandstones and argilites which can reach 300 m in thickness. Heavy mineral analyses and quartz exoscopic studies of this detrital material allow to understand the geology of these formations. The detrital material origin: heavy mineral distribution in the lower levels indicates mostly a meridional origin with a quantitatively poor peripheral supply. The importance of the transport: quartz exoscopic observations show that the main part of the detrital materia…

symbols.namesakePaleontologyHeavy mineralsymbolsErosionAlluviumContext (language use)Ecological successionMesozoicCarnot cycleQuartzGeologyJournal of African Earth Sciences (and the Middle East)
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