{"refrec":{"BRefID":220139,"RR":"<b>Casier, J.-G.; Cambier, G.; Devleeschouwer, X.; Petitclerc, E.; Préat, A.</b> (2010). Ostracods, rock facies and magnetic susceptibility of the Trois-Fontaines and Terres d’Haurs Formations (Early Givetian) in the Rancennes quarry at the Mont d’Haurs (Givet, France). <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 80</i>: 85-114","BEntID":211871,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 80</i>: 85-114","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Casier, J.-G.; Cambier, G.; Devleeschouwer, X.; Petitclerc, E.; Préat, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Casier, J.-G. <i>et al.</i>","Englishabstract":" About 1,200 ostracods were extracted from 64 samples collected in the upper part of the Trois-Fontaines Formation (Fm) and in the base of the Terres d’Haurs Fm in the Rancennes quarry located along the western rampart of an historic entrenched military camp at the Mont d’Haurs (southern part of the Dinant Synclinorium, Ardennes Department, France). The ostracod richness and diversity are quite variable, and monospecificity prevails in numerous samples. Forty-nine ostracod species are recognised. In the Trois-Fontaines Fm, environments were lagoonal or semi-restricted, and the level containing numerous Leperditicopid ostracods (<i>Herrmannina</i>) indicative of (brackish?) lagoonal environments is 40 m thick. In the Terres d’Haurs Fm the environment was semi-restricted or more frequently shallow marine but the energy of the environment was apparently never very high. The level rich in Leperditicopida (<i>Herrmannina</i>) in the Trois-Fontaines Fm corresponds remarkably to the highest magnetic susceptibility (MS) value. The Rancennes microfacies point to a tidal flat system with various subenvironments such as restricted intertidal, supratidal and channel deposits. The system was bordered by subtidal open marine deposits where former reefal constructions have been destroyed. Frequent oscillations in this low-gradient shallow platform led to the exposure and modification of marginal ponds, floodplain environments or palustrine areas. No evidence of evaporitic environments or sabkha were encountered. The sedimentary system records the evolution of a shallow restricted carbonate platform (Trois-Fontaines Fm) to a carbonate ramp setting (Terres d’Haurs Fm). The evolution of the platfom to a ramp could be related to the cessation of the active role of a reefal barrier possibly as a response to synsedimentary tectonism and block faulting.The magnetic susceptibility curve established for the Rancennes quarry highlights 26 short-term magnetic evolutions that can be grouped into 10 major long-term magnetic sequences characterized by decreasing, increasing or stable magnetic susceptibility fluctuations. Magnetic susceptibility values range between 3.75 x 10<sup>-9</sup> and 2.98 x 10<sup>-7</sup> m<sup>³</sup>/kg. There is a general good correspondence between the microfacies and magnetic susceptibility curves, which are clearly mimetic at the smaller scale (<i>i.e.</i>, 5th-order parasequences). The magnetic susceptibility curve could thus be interpreted as sea-level oscillations. A part of the magnetic minerals carrying the MS signal must have a detrital origin. Magnetization and coercivity ratios deduced from hysteresis loops indicate the presence of detrital coarse-grained multi-domain magnetite and authigenic mixtures of fine-grained superparamagnetic and single-domain magnetite. The MS signal of the Rancennes quarry seems to be controlled by the ferrimagnetic fraction (magnetite) with minor paramagnetic contribution (clay minerals and pyrite).The Rancennes quarry completes the stratotype of the Terres d’Haurs Fm because the section exposes the boundary with the Trois-Fontaines Fm unlike the previously proposed stratotype located on the south-eastern flank of the Mont d’Haurs entrenched camp.","AbstractOtherLang":"Plus de 5.500 carapaces, valves et fragments d’ostracodes ont été extraits de 48 échantillons récoltés dans le stratotype de la Formation (= Fm) des Terres d’Haurs et dans l’extrême base de la Fm du Mont d’Haurs, au Mont d’Haurs, près de Givet. Cinquante-deux espèces appartenant au Mega-Assemblage de l’Eifel sont reconnues, et elles indiquent généralement des environnements marins sous la zone d’action des vagues de beau temps et occasionnellement sous la zone d‘action des vagues de tempêtes. Des ostracodes indicateurs d’environnements semi-restreints sont également reconnus mais l’analyse sédimentologique montre que parfois ces ostracodes ont été transportés. Au passage Fm des Terres d’Haurs / Fm du Mont d’Haurs, des ostracodes à carapaces épaisses témoignent d’une plus grande agitation des eaux. La grande abondance des ostracodes et leur grande diversité montrent que les conditions de vies étaient particulièrement favorable pour ces crustacés. Dix microfaciès sont reconnus, leur succession de 1 à 10 correspond à une séquence standard de type ’shalllowing-upward’ depuis des milieux marins ouverts à proximité de la zone d’action des tempêtes jusqu’aux milieux littoraux proches de l’émersion. L’analyse des microfaciès met en évidence un système de rampe carbonatée avec des shoals oolithiques et algaires séparant un domaine semi-restreint et littoral du milieu marin franc. Les événements de tempêtes, et ceux liés à l’activité des vagues, redistribuent les organismes qui formaient des biocénoses diversifées à échinodermes, bryzoaires, mollusques et brachiopodes dans les environnements d’avant-shoal. La courbe lithologique traduit une évolution transgressive progressive (cortège sédimentaire) en deux phases marquées par deux ensembles de paraséquences: le premier ensemble enregistre la déstabilisation de la plate-forme carbonatée sous-jacente (Fm de Trois-Fontaines) donnant lieu à la mise en place d'environnements de type lagunaires “ouverts” dans la rampe interne, le second ensemble correspond à l’installation des shoals à la limite rampe interne/médiane. Aucun épisode récifal important n’est présent, et les shoals sont de relief modeste. La salinité et l’énergie sont les paramètres majeurs qui déterminent les zonations d’organismes et la répartition des environnements. Les valeurs de susceptibilité magnétique en champ faible (XLF) sont faibles et huit évolutions de susceptibilité magnétique sont reportées face à la colonne lithologique. Les courbes de susceptibilité magnétique et de microfaciès sont relativement mimétiques dans la première moitié de la coupe et opposées dans la partie supérieure de la Formation des Terres d’Haurs. Une tendance décroissante des valeurs de SM en champ faible à travers la limite entre les formations de Terres d’Haurs et de Mont d’Haurs est observée. Deux modèles de régression linéaire sont proposés dont l’un montre une correlation positive modérée entre les valeurs XLF et les microfaciès dans la première moitié de la coupe et le deuxième est caractérisé par une corrélation négative forte entre ces deux paramètres pour la partie supérieure de la Fm des Terres d’Haurs. L’agitation de l’eau est la plus élevée dans la rampe interne et médiane en association avec les environnements de shoals oolithiques et algaires et correspond aux valeurs les plus faibles des valeurs en XLF. La partie inférieure semble correspondre plus à un profil de plateforme carbonatée par opposition au second modèle qui confirme une morphologie de rampe carbonatée. Les valeurs moyennes de XLF observées dans la partie supérieure de la Fm des Terres d’Haurs sont relativement homogènes comparées aux fluctuations reportées dans la moitié inférieure de la coupe. Une corrélation stratigraphique à haute résolution est proposée pour la base de la Fm du Mont d’Haurs en Belgique et en France en raison d’une similitude des données de XLF établies pour la coupe des Monts de Baileux située à quarante kilomètres de distance du stratotype.","BibLvlCode":"AS","StandardTitle":"Ostracods, rock facies and magnetic susceptibility of the Trois-Fontaines and Terres d’Haurs Formations (Early Givetian) in the Rancennes quarry 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, Palaeoecology, Magnetic Susceptibility, Givetian, Dinant Synclinorium, Ardennes, France","OtherDescriptors":null,"Notes":null,"AnaPub":2010,"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":220139,"PubliDate":2010,"Pagination":"85-114","XtraPublOfAnaID":null,"ISBN":null,"Volume":"80","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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