La limite Cénomanien-Turonien en Tunisie centrale et méridionale: biostratigraphie et paléoenvironnements

Razgallah, Saloua; Philip, Jean; Thomel, Gérard; Zaghbib-Turki, Dalila; Chaabani, Fredj; Ali, Nauman; Mrabet, Ali

doi:10.1006/cres.1994.1031

Cited by 59 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other basins, black shales documented were deposited in a similar depositional context (e.g. Tunisia, Robaszynski et al 1994;Razgallah et al 1994). In the Vocontian Basin, especially at Vergons, these layers have been intensively studied, including various methods (organic matter, Crumière 1989;Crumière et al 1990; ichnofacies, Olivero & Gaillard 1996;foraminifers, Tronchetti & Groshény 1991, Groshény et al 1992, Groshény & Tronchetti 1993Groshény & Malartre 1997;ostracods, Babinot & Groshény 1993;palynology, Courtinat et al 1991, Svobodová et al 1998carbon isotopes, Morel 1998).…”

Section: Timing Of Anoxiamentioning

confidence: 89%

European ammonoid diversity questions the spreading of anoxia as primary cause for the Cenomanian/Turonian (Late Cretaceous) mass extinction

Monnet¹,

Bucher²

2007

Swiss j geosci

View full text Add to dashboard Cite

Ammonoid diversity patterns show that the spreading of oceanic anoxia is not the initial and major kill mechanism for the Cenomanian/Turonian mass extinction as usually suggested. In the Anglo-Paris Basin and the Vocontian Basin, the drop of ammonoid species richness starts around the middle/late Cenomanian boundary, i.e. 0.75 myr before the occurrence of anoxic deepwater sediments. The stepwise extinction of first heteromorphs and then acanthoceratids is incompatible with the rise of the oxygen minimum zone. Moreover, shelf environments of these basins remained well oxygenated during the Cenomanian/Turonian boundary interval. Thus, we stress that other causative mechanisms initiated the ammonoid extinction even if anoxia subsequently participated in the demise of marine ecosystems. RESUME L'extinction de masse de la limite Cénomanien/Turonien (Crétacé supérieur) est habituellement considérée comme un exemple typique d'extinction globale causée par la remontée d'eaux anoxiques. Cependant, l'analyse des changements de biodiversité des ammonoïdés durant l'intervalle Cénomanien-Turonien inférieur démontre que cet événement océanique anoxique (OAE2) n'est pas la cause initiale et majeure de l'extinction des ammonites. Les bassins européens (Bassin anglo-parisien et Bassin vocontien) montrent que la chute de diversité (en terme de richesse spécifique) des ammonites s'amorce autour de la limite Cénomanien moyen/supérieur. Le déclin des ammonites se produit donc 0,75 million d'années avant le développement des eaux anoxiques. A ce décalage temporel entre les ammonites et l'anoxie s'ajoute une incompatibilité entre l'expansion d'eaux anoxiques vers les plateformes et le déclin prématuré des hétéromophes (plutôt pélagiques) par rapport aux acanthoceratidés (plutôt necto-benthiques). De plus, l'enregistrement stratigraphique des domaines peu profonds de ces bassins montre clairement que les eaux sont toujours largement oxygénées pendant la limite Cénomanien/Turonien. Il est donc probable que des mécanismes autres que l'anoxie doivent avoir initié l'extinction de masse de la limite Cénomanien/Turonien (au moins en ce qui concerne les ammonites), même si l'anoxie a ensuite partiellement participé au bouleversement des écosystèmes marins à cette période.

show abstract

Section: Timing Of Anoxiamentioning

confidence: 89%

European ammonoid diversity questions the spreading of anoxia as primary cause for the Cenomanian/Turonian (Late Cretaceous) mass extinction

Monnet¹,

Bucher²

2007

Swiss j geosci

View full text Add to dashboard Cite

show abstract

“…It consists of brown dolomitic limestone, with the occurrence of gastropods, pelecypods and rudists (e.g. Razgallah et al, 1994;M'Rabet et al, 1995;Abdallah and Meister, 1997). Rare chert nodules can also be observed.…”

Section: Sedimentological Descriptionmentioning

confidence: 99%

Timing of early to mid-cretaceous tectonic phases along North Africa: New insights from the Jeffara escarpment (Libya–Tunisia)

Bodin

Petitpierre

Wood

et al. 2010

Journal of African Earth Sciences

View full text Add to dashboard Cite

a b s t r a c tThe Jeffara escarpment spans 400 km from southeastern Tunisia to sorthwestern Libya, and marks the northern edge of the Berkine-Ghadames Basin. Its horseshoe shape provides a good 3D control of regional-scale depositional architecture. Historically, the political border between Tunisia and Libya hindered the integration of studies over its entirety, which led to the establishment of separate litho-biostratigraphic frameworks. Field-work undertaken on both sides of the border has allowed the unification of lithostratigraphic schemes developed in both countries. Published stratigraphic ages of the different formations and members are compared and integrated in order to propose a unified bio-lithostratigraphic framework. The correlation of serial sections along the Jeffara escarpment shows that two major tectonic unconformities divide the Early Cretaceous sedimentary pattern. The first one is dated as Late Aptian and is commonly associated with the European ''Austrian" tectonic phase. The second, which has previously not been recognized as a regional significant surface in Libya, occurs during the Middle Albian and marks moreover the transition from a siliciclastic to a carbonate-dominated sedimentation regime. These two important regional unconformities form the lower and upper boundaries of the Kiklah-Aïn el Guettar Formations, and can be associated with intra-plate deformation linked with the opening of the central segment of the South Atlantic and the Equatorial Atlantic oceans.

show abstract

“…Globally, during the start of the transgressive phase, the Upper Albian platform remained poor in corals and rudists. [15,16,17]. In some cases, these rudists are associated with hexacorals, stromatoporoids, bryozoans and red algae (corallines).…”

Section: Albianmentioning

confidence: 99%

“…During the latest Cenomanian-earliest Turonian time, the rudist formations seem to have retrograded toward the south and they were developed in the previous inner platform [16]. So, in the Jebel Orbata, Jebel Zitouna, Jebel Asker ranges, the bioclastic carbonates of the Guettar Formation contain some lithosomes of rudists that may be gathered in bouquets (Table 3).…”

Section: Albianmentioning

confidence: 99%

See 1 more Smart Citation

Cretaceous Coral-Rudist Formations in Tunisia

Zaghbib-Turki¹

2003

North African Cretaceous Carbonate Platform Systems

Self Cite

View full text Add to dashboard Cite

Coral-rudist formations in Tunisia are known from Upper Jurassic and Cretaceous outcrops. The main Cretaceous examples are located in Central Tunisia (from 36°N to 34"N) and developed to varying extents around an emerged land known as Kairouan Island or Kasserine Island. These formations were developed intermittently during the Cretaceous (principally Aptian, Cenomanian, Turonian and Late Campanian). They were situated mainly on the outer shelf. The extensive shallow marine carbonate deposits were rich in rudists formations especially since the Aptian. Sometimes, algae, sponges, corals, and rudists were associated. Many Cretaceous coral-rudist formations illustrate a biological zonation.

show abstract

La limite Cénomanien-Turonien en Tunisie centrale et méridionale: biostratigraphie et paléoenvironnements

Cited by 59 publications

References 0 publications

European ammonoid diversity questions the spreading of anoxia as primary cause for the Cenomanian/Turonian (Late Cretaceous) mass extinction

European ammonoid diversity questions the spreading of anoxia as primary cause for the Cenomanian/Turonian (Late Cretaceous) mass extinction

Timing of early to mid-cretaceous tectonic phases along North Africa: New insights from the Jeffara escarpment (Libya–Tunisia)

Cretaceous Coral-Rudist Formations in Tunisia

Contact Info

Product

Resources

About