{"refrec":{"BRefID":233651,"RR":"<b>Dupuis, C.; Steurbaut, E.; Molina, E.; Rauscher, R.; Tribovillard, N.; Arenillas, I.; Arz, J.A.; Robaszynski, F.; Caron, M.; Robin, E.; Rocchia, R.; Lefevre, I.</b> (2001). The Cretaceous-Palaeogene (K/P) boundary in the Aïn Settara section (Kalaat Senan, Central Tunisia): lithological, micropalaeontological and geochemical evidence. <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 71</i>: 169-190","BEntID":225337,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 71</i>: 169-190","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Dupuis, C.; Steurbaut, E.; Molina, E.; Rauscher, R.; Tribovillard, N.; Arenillas, I.; Arz, J.A.; Robaszynski, F.; Caron, M.; Robin, E.; Rocchia, R.; Lefevre, I.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Dupuis, C. <i>et al.</i>","Englishabstract":"The Cretaceous-Palaeogene (K/P) boundary, until recently known as the \"Cretaceous-Tertiary\" or K/T boundary, is well exposed at Aïn Settara in the Kalaat Senan area (Central Tunisia), 50 km south of the El Kef section. Micropalaeontological and geochemical studies led to the identification of six main features tentatively named \"events\", which characterise the K/P boundary interval, and of which at least two (B and C) have global significance. The lowermost event A located at about 14 cm below the base of the Dark Boundary Clay is marked by a sudden increase in tiny bioturbations, by small nodules and a few macrofossils, a 50% drop in calcareous nannofossil abundance and an increase in Scytinascias (organic linings of foraminifera). It is thought to witness a slowdown in sedimentation. Event B is characterised by a burrowed surface, separating the ca 60-cm thick Dark Boundary Clay from the underlying Aïn Settara marls. It indicates an episode of nondeposition, just before a major change in lithology from marls to clays, corresponding to a major flooding. No substantial palaeontological changes have been recorded in relation to this event. Event C is characterised by maximum concentrations of Ir and Ni-rich spinels, which have been observed in platy nodules, similar to the level at El Kef (K/P boundary <i>sensu</i> ODIN, 1992). It coincides with a major extinction in planktonic foraminiferal species (71%) and a 60% drop in nannofossil abundance. The change in lithology (occurrence of small ripples and channel-like structures) recorded at event D, a few cm up-section, might be related to a locally recorded storm activity. Events E and F, which are situated higher up in the Dark Boundary Clay, are mainly determined by palaeontological changes (palynomorphs and nannofossils), probably resulting from small sea-level variations. The coincidence of the cosmic markers with the major biotic changes at event C pleads for the asteroid impact hypothesis. Their disjunction from the base of the Dark Boundary Clay shows that the change of lithology usually used to determine the K-P boundary is distinct from the major extinction (in the planktonic realm), classically referred to this boundary and linked to the presence of cosmic markers. These results argue the need for the revaluation of the K-P boundary GSSP at El Kef. It is suggested to redefine the K-P boundary at the level of coincidence of the major biotic changes and the cosmic markers.","AbstractOtherLang":"La limite Crétacé/Paléogène (K/P), connue jusqu'à maintenant comme la limite \"Crétacé/Tertiaire\" (K/T) est particulièrement bien exposée à l'Ain Settara dans la région de Kalaat Senan, quelques 50 km au sud de la section type d'El Kef. Une étude pluridisciplinaire micropaléontologique et géochimique de l'intervalle de la limite K/P aboutit à l'identification de six événements, parmi lesquels deux au moins (B et C) ont une signification globale. Le plus inférieur, l'événement A, localisé à 14 cm en dessous de la limite K/P, est marqué par quelques petites concrétions et de rares petits macrofossiles, par une chute de 50% de l'abondance des nannofossiles calcaires et par une augmentation des Scytinascias (restes organiques de foraminifères). Il est rapporté à une réduction du taux de sédimentation dont l'origine reste jusqu'à présent incertaine. L'événement B, à 3 cm en dessous de la limite K/P, est caractérisé par une surface bioturbée qui sépare les 60 cm de l'Argile Limite des marnes de l'Aïn Settara sous-jacentes. Il indique un épisode de non-dépôt, précédant immédiatement le début d'une transgression majeure, globalement reconnue. Aucun changement paléontologique n'est enregistré à ce niveau. L'événement C est caractérisé par des concentrations maximales d'iridium et de spinelles nickelifères apparaissant dans les nodules jarositiques aplatis qui marquent la limite K/P comme au Kef (la limite K/P <i>sensu</i> ODIN, 1992). Il coïncide avec une extinction majeure des espèces de foraminifères planctoniques (71%) et avec une chute de 60% de l'abondance des nannofossiles. Le changement lithologique (petits chenaux et rides) enregistré par l'événement D, quelques cm plus haut, est relié à un dépôt de tempête de signification locale. Les événements E et F, qui prennent place plus haut dans l'Argile Limite sont essentiellement révélés par des modifications paléontologiques (palynomorphes et nannofossiles) et résultent probablement de légères fluctuations du niveau marin. La coïncidence des marqueurs cosmiques avec les changements biotiques majeurs à la limite K/P de l'Aïn Settara plaide pour l'hypothèse de l'impact météoritique. Leur séparation par rapport à la base de l'Argile Limite indique que la succession est légèrement plus complète qu'au Kef, ce qui justifierait une réévaluation du stratotype de la limite K/P et du Point Stratotype Global (PSG). Il paraît maintenant opportun de redéfinir la limite K/P au niveau où coïncident les changements biotiques majeurs et les marqueurs cosmiques.","BibLvlCode":"AS","StandardTitle":"The Cretaceous-Palaeogene (K/P) boundary in the Aïn Settara section (Kalaat Senan, Central Tunisia): lithological, micropalaeontological and geochemical evidence","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":"K/P boundary, Aïn Settara, Tunisia, lithology, micropalaeontology, geochemistry","OtherDescriptors":null,"Notes":null,"AnaPub":2001,"MonPub":null,"DateUpdate":"2014-02-17","DateCreate":"2014-02-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":233651,"PubliDate":2001,"Pagination":"169-190","XtraPublOfAnaID":null,"ISBN":null,"Volume":"71","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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