{"refrec":{"BRefID":220155,"RR":"<b>Casier, J.-G.; Devleeschouwer, X.; Petitclerc, E.; Préat, A.</b> (2011). Ostracods, rock facies and magnetic susceptibility of the Hanonet Formation / Trois-Fontaines Formation boundary interval (Early Givetian) at the Mont d’Haurs (Givet, France). <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 81</i>: 63-96","BEntID":211887,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 81</i>: 63-96","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Casier, J.-G.; Devleeschouwer, X.; Petitclerc, E.; Préat, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Casier, J.-G. <i>et al.</i>","Englishabstract":"Approximately 870 carapaces, valves and fragments of ostracods were extracted from 26 samples collected in the Hanonet Formation (= Fm) and Trois-Fontaines Fm in a section located along the southwestern rampart of the historically entrenched military camp at the Mont d’Haurs (Givet, France). Forty-eight species belonging to the Eifelian Mega-Assemblage have been identified and three new are proposed: <i>Coryellina? audiarti</i> nov. sp., <i>Cavellina haursensis</i> nov. sp. and <i>Parabolbinella coeni</i> nov. sp. The ostracod assemblages are generally indicative of shallow marine well-oxygenated environments, except at the base of the Trois-Fontaines Fm where ostracods indicative of semi-restricted and even of lagoonal water conditions are reported.The sedimentary record represents a transition from mixed siliciclastic-carbonate open-marine ramp system to restricted carbonate platform with deposition in low-energy peritidal and lagoonal settings frequently affected by subaerial exposition. A general trend follows a shallowing-upward and a relative sea-level decrease from the Hanonet Fm toward the Trois-Fontaines Fm.High-energy characterized the ramp setting and destroyed most of the stromatoporoid and coral buildups, which occur as floatstone and rudstone accumulations forming a thick biostrome. <i>Girvanella</i> and issinellid shoals developed also in this high-energy environment. The low-field magnetic susceptibility (=MS) log plotted against the lithological column reveals four magnetic sequences. The MS log and microfacies are moderately correlated mainly due to the evolution of sedimentary environments from a ramp to a platform. The MS values of the Trois-Fontaines Fm are very low in the biostromal unit whereas restricted lagoonal facies are characterized by the highest values of MS. A high-resolution stratigraphic correlative pattern is proposed here between the Mont d’Haurs section and the 40 km distant Baileux section despite the greater thickness. The MS signal is strongly controlled by minerals of ferromagnetic characteristics with a minor contribution of paramagnetic phases. The lagoonal sediments of the Trois-Fontaines Fm are characterized also by the highest values of normalized viscosity coefficient and a IRM loss. These results confirm the occurrence of a significantly high proportion of ultrafine magnetic grains which may be formed during diagenesis by chemical remanent magnetization processes.The list of the Givetian ostracods figured by Coen (1985) and recently lodged at the Department of Paleontology at the Royal Belgian Institute of Natural Sciences is reported in annex with new inventory numbers.","AbstractOtherLang":"Environ 870 carapaces, valves et fragments d’ostracodes ont été extraits de 26 échantillons récoltés dans le sommet de la Formation d’Hanonet et dans l’extrême base de la Formation des Trois-Fontaines, au Mont d’Haurs (Givet, France). La coupe étudiée est située à proximité des remparts sud-ouest du camp militaire retranché construit par Vauban au XVIIième siècle. Quarante-sept espèces d’ostracodes appartenant au Méga-Assemblage de l’Eifel sont reconnues et trois nouvelles sont proposées: Coryellina? audiarti nov. sp., Cavellina haursensis nov. sp. et Parabolbinella coeni nov. sp. La faune d’ostracodes recueillie appartient au Mega-Assemblage de l’Eifel et elle indique généralement des milieux marins peu profonds et bien oxygénés. Exceptionnellement dans la base de la Formation de Trois-Fontaines, la présence d’une association monospécifique à Coeloenellina indique des milieux semi-restreints et la présence de Leperditicopida, mise en évidence dans un échantillon étudié lors de l’analyse sédimentologique, atteste de conditions lagunaires. Ces conditions environnementales semi-restreintes et lagunaires se généralisent ensuite dans la partie moyenne et supérieure de la Formation de Trois-Fontaines tel qu’on peut l’observer dans la carrière de Rancennes, aussi au Mont d’Haurs (CASIER et al., 2010). La sédimentation témoigne de la transition d’un système de rampe silico-carbonatée à un système de plate-forme carbonatée restreinte caractérisée par des dépôts péritidaux de basse énergie et lagunaires, et affectée fréquemment par une exposition subaérienne. L’évolution générale de la sédimentation montre que le milieu devient peu profond, ce qui témoigne d’une baisse relative du niveau marin au passage de la Formation d’Hanonet à la Formation de Trois-Fontaines. La rampe est caractérisée par des environnements de forte énergie qui détruisent la plupart des bioconstructions à stromatopores et coraux apparaissant alors sous forme d’accumulations de floatstones et rudstones formant un biostrome épais. Dans ce contexte de haute énergie, on observe des bancs à Girvanella et Issinélides. La courbe de susceptibilité magnétique en champ faible placée face à la colonne lithologique révèle quatre séquences magnétiques. Les courbes de susceptibilité magnétique et de microfaciès sont modérément corrélées et sont essentiellement liées à l’évolution des environnements d’une rampe vers une plate-forme. Les valeurs de susceptibilité magnétique sont très faibles au cours de l’unité biostromale avant d’atteindre les plus fortes valeurs dans l’environnement de lagon restreint de la Formation de Trois-Fontaines. Une corrélation stratigraphique à haute resolution est proposée entre la coupe du Mont d’Haurs et celle de Baileux, située à une distance de 40 km, où des fluctuations similaires de la susceptibilité magnétique sont reconnues malgré une épaisseur plus forte des sédiments dans la coupe de Baileux. Le signal de susceptibilité magnétique est fortement contrôlé par les minéraux ferromagnétiques s.l. ainsi que par une contribution moindre des grains paramagnétiques. Le coefficient normalisé de viscosité magnétique et la décroissance d’IRM montre les valeurs les plus élevées dans les sédiments du lagon de la Formation de Trois-Fontaines qui présentent également les valeurs les plus élevées de susceptibilité magnétique. Ces résultats indiquent la presence d’une quantité significative de grains de magnétite de granulométrie ultrafine très probablement formés au cours de la diagenèse. La liste des ostracodes givétiens, figurés par COEN (1985) et récemment versés dans les collections du Département de Paléontologie de l’Institut royal des Sciences naturelles de Belgique, est reportée en annexe. Ces ostracodes ont reçu des nouveaux numéros d’inventaire.","BibLvlCode":"AS","StandardTitle":"Ostracods, rock facies and magnetic susceptibility of the Hanonet Formation / Trois-Fontaines Formation boundary interval (Early Givetian) at the Mont d’Haurs (Givet, France)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Ostracods, Sedimentology, Paleoecology, Magnetic susceptibility, Early Givetian, Dinant Synclinorium, Ardennes, France","OtherDescriptors":null,"Notes":null,"AnaPub":2011,"MonPub":null,"DateUpdate":"2013-11-18","DateCreate":"2012-11-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":220155,"PubliDate":2011,"Pagination":"63-96","XtraPublOfAnaID":null,"ISBN":null,"Volume":"81","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":64308,"SerRR":"Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen. 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