{"refrec":{"BRefID":233845,"RR":"<b>Casier, J.-G.; Lebon, A.; Mamet, B.; Préat, A.</b> (2005). Ostracods and lithofacies close to the Devonian-Carboniferous boundary in the Chanxhe and Rivage sections, northeastern part of the Dinant Basin, Belgium. <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 75</i>: 95-126","BEntID":225530,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 75</i>: 95-126","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Casier, J.-G.; Lebon, A.; Mamet, B.; Préat, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Casier, J.-G. <i>et al.</i>","Englishabstract":"The Chanxhe and Rivage sections along the Ourthe River are two important reference sections for the Devonian/Carboniferous (D/C) boundary in the northeastern part of the Dinant Basin. Seven major microfacies types are defined in the D/C strata (50 m) of these two sections. They permit recognition of several levels encompassing the Comblain-au-Pont and Hastière formations. These levels record shallow open-marine sedimentation oscillating between the storm and the fair-weather wave bases in the euphotic zone. The microfacies in the upper part of the sections (Hastière Formation) indicates strong salinity variations with evaporitic reflux and lagoonal influences. The environment is again open-marine in the uppermost part of the Hastière Formation. The general environment consists of small shoals which have partly isolated an offshore domain (MF1-MF4) from a semirestricted area (MF6 and MF7) where salinity fluctuations were the predominant factor as indicated by monospecific fauna and flora (<i>Earlandia</i>, umbellinids, calcispheres, ...). Only ostracods and <i>Earlandia minima</i> (foraminifers) survived in these stressful environments. These organisms are related to cryptalgal bindstones or mats located at proximity and forming numerous \"algal chips\". The abundance of sulfate pseudomorphs in MF5, MF6 and MF7 indicate the importance of the diagenetic reflux of evaporitic brines in this general shallow marine environment. The main diagenetic overprint is the development of clear sparite cements replacing the original textures.The foraminiferal zonation indicates hiatuses throughout the series. Ostracods are moderately abundant in the Chanxhe and Rivage sections and sixty-two taxa, the majority of which are in open nomenclature, are recognized; nearly all are illustrated, and one new species (<i>Cavellina chanxhensis</i> nov. sp. ) is established. They belong to the Eifelian Mega-Assemblage and practically all samples containing identifiable ostracods contain podocopid ostracods indicative of well-oxygenated water conditions with salinity normal or very close to the normal. The abundance of Platycopina and Eridostraca (<i>Cryptophyllus</i>) in the Comblain-au-Pont Formation indicates a deposition in a very shallow slight restricted environment. Due probably to the strong salinity variations pointed out by the sedimentological analysis, ostracods are missing, rare or poorly preserved in the top of the Comblain-au-Pont Formation and in the base and middle part of the Hastière Formation. However, no assemblage indicative of really semi-restricted water conditions was recorded in these levels probably because these variations of salinity were too strong and (or) too rapid. In the upper part of the Hastière Formation, ostracods are very abundant and indicative of marine environments between fair-weather and storm wave bases. The distribution of ostracods in the Chanxhe and Rivage sections is slightly different compared to sections investigated in the southwestern border of the Dinant Basin and in the Avesnes Basin. The study of ostracods at Chanxhe and Rivage confirms also that the Hangenberg Event has probably no influence on their distribution in shallow settings.Our conclusion is that the Chanxhe and Rivage sections are not reliably continuous successions for the study of the D/C boundary.","AbstractOtherLang":"A Chanxhe et Rivage, dans la vallée de l'Ourthe, deux coupes de référence importantes pour la partie nord-est du Bassin de Dinant, exposent les couches de passage du Dévonien au Carbonifère (D/C). Sept microfaciès majeurs sont définis dans ces deux coupes (50 m) et permettent de reconnaître la succession de plusieurs niveaux dans les formations de Comblain-au-Pont et d'Hastière. Les faciès indiquent un milieu marin ouvert peu profond, situé dans la zone euphotique, entre la zone d'action des tempêtes et celle des vagues normales.La partie supérieure des deux coupes (Formation d'Hastière) renferme principalement les microfaciès 6 et 7 indiquant de fortes variations de salinité avec évaporites de reflux et influences lagunaires prononcées. La partie supérieure de la Formation d'Hastière marque un retour aux conditions marines normales, qui prévalaient dans la Formation de Comblain-au-Pont. Le modèle sédimentaire général est celui d'une rampe mixte avec développement de petits \"shoals\" ou \"dunes\" bioclastiques isolant partiellement un domaine ouvert (MF1-MF4) d'un domaine semi-restreint (MF6 et MF7). Dans ce dernier les fluctuations de salinité sont importantes et se marquent par la prédominance de communautés fauniques ou de microflores monospécifiques (à <i>Earlandia</i>, Umbelles, Calcisphères). Les Ostracodes et <i>Earlandia minima</i> (Foraminifères) sont les seuls organismes à proliférer dans de tels environnements. Ils sont parfois associés à des bindstones ou tapis cryptalgaires et microbiens dont le démantèlement suite aux processus diagénétiques alimentent de nombreux \"copeaux algaires\" et \"lumps\" dans le milieu de sédimentation. Les nombreux pseudomorphes dans les MF5, MF6 et MF7 soulignent l'importance de la diagenèse de reflux de saumures évaporitiques dans cet environnement marin peu profond. Cette diagenèse se marque par un fort développement d'un ciment clair ou très blanchâtre de sparite en grands cristaux remplaçant les textures initiales. La zonation des Foraminifères met en évidence l'importance des hiatus ou discordances sédimentaires de la série D/C qui est loin de constituer une série continue. L'analyse de la courbe lithologique confirme également l'importance des hiatus. Les Foraminifères permettent également de corréler entre eux les différents niveaux des deux coupes. L'analyse sédimentologique et biostratigraphique montre que les coupes de Chanxhe et de Rivage représentent de mauvaises sections pour l'étude de la transition D/C: en aucun cas elles ne représentent des séries continues. Enfin, l'altération diagénétique par reflux évaporitique rend particulièrement difficile la reconstitution et l'interprétation des paléoenvironnements de la Formation d'Hastière.Les ostracodes sont relativement abondants dans les coupes de Chanxhe et Rivage, et soixante-deux taxa, la majorité en nomenclature ouverte mais quasi tous figurés, sont reconnus, et une nouvelle espèce (<i>Cavellina chanxhensis</i> nov. sp.) est fondée. Ils appartiennent au Méga-Assemblage de l'Eifel et presque tous les échantillons contenant des ostracodes identifiables ont livré des Podocopina indiquant des eaux bien oxygénées à salinité normale ou très proche de la normale. L'abondance des Platycopina et des Eridostraca (<i>Cryptophyllus</i>) dans la Formation de Comblain-au-Pont dénote un milieu de dépôt devenant, mais plus rapidement à Rivage, très peu profond et très légèrement semi-restreint. Dans le sommet de la Formation de Comblain-au-Pont, dans la base et dans la partie moyenne de la Formation d'Hastière, les ostracodes sont parfois absents, indéterminables ou rares, et c'est probablement lié aux fortes variations de salinité mises en évidence par l'analyse sédimentologique. Néanmoins aucun assemblage d'ostracodes caractéristiques de milieux semi-restreints n'est mis en évidence dans ces niveaux. Les ostracodes présents dans le sommet de la Formation d'Hastière indiquent des milieux marins francs entre les niveaux d'action des vagues de beau temps et de tempêtes. La distribution des ostracodes diffère légèrement de celle observée dans la bordure sud-ouest du Bassin de Dinant, et dans le Bassin d'Avesnes. L'étude des ostracodes présents à Chanxhe et Rivage confirme que l'Evénement Hangenberg n'a probablement aucune influence sur leur distribution en milieux peu profonds.","BibLvlCode":"AS","StandardTitle":"Ostracods and lithofacies close to the Devonian-Carboniferous boundary in the Chanxhe and Rivage sections, northeastern part of the Dinant Basin, Belgium","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Ostracods, Sedimentology, Paleoecology, Devonian-Carboniferous boundary, Dinant Basin, Belgium","OtherDescriptors":null,"Notes":null,"AnaPub":2005,"MonPub":null,"DateUpdate":"2014-02-25","DateCreate":"2014-02-25","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":233845,"PubliDate":2005,"Pagination":"95-126","XtraPublOfAnaID":null,"ISBN":null,"Volume":"75","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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