{"refrec":{"BRefID":223650,"RR":"<b>Muchez, P.; Conil, R.; Viane, W.; Bouckaert, J.; Poty, E.</b> (1987). Sedimentology and biostratigraphy of the Visean carbonates of the Heibaart (DzH1) borehole (Northern Belgium). <i>Ann. Soc. géol. Belg. (1968) 110(2)</i>: 199-208","BEntID":215373,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Ann. Soc. Géol. Belg. (1968) 110(2)</i>: 199-208","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Muchez, P.; Conil, R.; Viane, W.; Bouckaert, J.; Poty, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Muchez, P. <i>et al.</i>","Englishabstract":"The Visean strata of the Heibaart borehole (DzH1, Campine-Brabant Basin, northern Belgium) can be divided into four lithological units. Biostratigraphical data indicate that the first unit was formed during the Late Moliniacian (foraminifer subzone Cf4d), the second during the Livian (Cf5), the third and the fourth during the Early Warnantian (subzones Cf6a-ß and Cf6? respectively).The Upper Moliniacian bioclastic packstones and grainstones were deposited in a shallow open marine environment in which water turbulence and circulation rates were high enough to prevent a considerable accumulation of mud.Due to a deepening of the sedimentation environment in the Heibaart area, the limestones of the Livian were deposited at depths below significant wave activity. In contrast, the lithoclastic limestones at the top of the Livian were formed in an environment with an important wave and/or current activity.The lower part of the Lower Warnantian (Cf6a-ß) strata represents deposits at or just below normal wave base. Current or wave activities are probably responsible for the grains-supported texture and the reworked fragments.A rise of the sea-level at the base of the upper part of the Early Warnantian caused a deepening of the sedimentation environment. An algal-cryptalgal buildup developed in the Heibaart area. The lower part of the buildup consists of non-laminated cryptalgal bodies (thrombolites) which are not restricted to the intertidal zone. However, in the upper part laminated stromatolites occur which are characteristic for a very shallow subtidal and intertidal zone. This shallowing upward sequence resulted from a drop of the sea-level at the end of the Early Warnantian or/and from the growth of the buildup.","AbstractOtherLang":"Quatre unités lithologiques peuvent être distinguées dans le Viséen du sondage de Heibaart (DzH1, Bassin de la Campine). La biostratigraphie situe la première unité dans le Molinacien supérieur (sous-zone Cf4d), la seconde dans le Livien (zone Cf5), la troisième et la quatrième dans le Warnantien (respectivement sous-zones Cf6a-ß et Cf6?).Les packstones et les grainstones bioclastiques du Molinacien supérieur ont été déposés dans un milieu peu profond et ouvert. La turbulence et la circulation de l'eau étaient assez élevées pour empêcher une accumulation significative de boue.Au début du Livien, un approfondissement de la plate-forme dans la région de Heibaart est marqué par des sédiments se déposant sous la zone d'action des vagues, alors qu'au sommet du Livien, des calcaires lithoclastiques indiquent un milieu marqué par une influence importante des vagues ou des courants.La partie inférieure du Warnantien inférieur (Cf6a-ß) est constituée de dépôts formés à la base de la zone d'action des vagues ou plus bas. L'activité des courants ou des vagues est probablement à l'origine de la texture «grain supported» et des fragments remaniés.Un changement du niveau de la surface marine dès la partie supérieure du Warnantien inférieur (Cf6?) a causé un approfondissement du milieu de sédimentation. Un buildup crypto-algaire s'est développé dans la région de Heibaart. Sa partie inférieure est constituée de corps crypto-algaires non laminés (thrombolites) qui ne sont pas restreints à la zone intertidale. Cependant, dans sa partie supérieure («mound cap»), on note la présence de stromatolites caractéristiques de la zone subtidale peu profonde et de la zone intertidale. Cette séquence se termine par des sédiments de faible profondeur, résultat d'une baisse du niveau de la surface marine au sommet du Warnantien inférieur ou/et de la croissance du buildup.","BibLvlCode":"AS","StandardTitle":"Sedimentology and biostratigraphy of the Visean carbonates of the Heibaart (DzH1) borehole (Northern Belgium)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-10 01:31:46.443256","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1987,"MonPub":null,"DateUpdate":"2014-09-09","DateCreate":"2013-03-19","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":223650,"PubliDate":1987,"Pagination":"199-208","XtraPublOfAnaID":null,"ISBN":null,"Volume":"110","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45503,"SerRR":"Annales de la Société géologique de Belgique. 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