Université de Neuchâtel

Platform-induced clay-mineral fractionation along a northern Tethyan basin-platform transect: implications for the interpretation of Early Cretaceous climate change (Late Hauterivian-Early Aptian)

Godet, Alexis ; Bodin, Stéphane ; Adatte, Thierry ; Föllmi, Karl B.

In: Cretaceous Research, 2008, vol. 29, no. 5-6, p. 830-847

High-resolution clay-mineral analyses were performed on upper Hauterivian to lower Aptian sediments along a platform-to-basin transect through the northern Tethyan margin from the Neuchâtel area (Switzerland), to the Vocontian Trough (France) in order to investigate links between climate change, carbonate platform evolution, and fractionation patterns in clay minerals during their transport....

Université de Neuchâtel

Enrichment of redox-sensitive trace metals (U, V, Mo, As) associated with the late Hauterivian Faraoni oceanic anoxic event

Bodin, Stéphane ; Godet, Alexis ; Matera, Virginie ; Steinmann, Philipp ; Vermeulen, Jean ; Gardin, Silvia ; Adatte, Thierry ; Coccioni, Rodolfo ; Föllmi, Karl B.

In: International Journal of Earth Sciences, 2007, vol. 96, no. 2, p. 327-341

The Faraoni Level is a short-lived oxygen-deficient event that took place during the latest Hauterivian. In order to improve our understanding of the palaeoenvironmental conditions that occurred during this event, we have analysed the contents of several redox-sensitive trace elements (U, V, Mo, As, Co, Cd, Cu, Zn, Ni, Pb, Cr) from bulk limestone samples of late Hauterivian–early Barremian age...

Université de Neuchâtel

Palaeoceanographic and palaeoclimatic changes during the Late Hauterivian-Barremian and their impact on the northern Tethyan margin : a combined sedimentological and geochemical approach

Bodin, Stéphane ; Föllmi, Karl (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2006 ; 1901.

The goal of this PhD study was to decipher the mechanisms responsible for changes in the carbonate platform factory accompanied by incipient drowning. For this purpose, a peculiar condensed level called the Altmann Member, which recorded the northern Tethyan margin drowning during the latest Hauterivian – Early Barremian, and which is now locked up in the Helvetic realm, was studied. Indeed,...

Université de Neuchâtel

Interactions between environmental change and shallow water carbonate buildup along the northern Tethyan margin and their impact on the Early Cretaceous carbon isotope record

Föllmi, Karl B. ; Godet, Alexis ; Bodin, Stéphane ; Linder, Pascal

In: Paleoceanography, 2006, vol. 21, no. PA4211, p. 1-16

The evolution of the Early Cretaceous, northern Tethyan carbonate platform was not only influenced by changes in sea level, detrital influx, and surface water temperature but also by changes in trophic levels. We distinguish between phases of carbonate production dominated by oligotrophic photozoan communities and by mesotrophic and eventually colder-water heterozoan communities. Superimposed on...

Université de Neuchâtel

Biostratigraphy, sedimentology and sequence stratigraphy of the latest Hauterivian – Early Barremian drowning episode of the Northern Tethyan margin (Altmann Member, Helvetic nappes, Switzerland)

Bodin, Stéphane ; Godet, Alexis ; Vermeulen, Jean ; Linder, Pascal ; Föllmi, Karl B.

In: Eclogae Geologicae Helvetiae, 2006, vol. 99, no. 2, p. 157-174

During the Early Cretaceous, major palaeoceanographic changes are mirrored on the northern Tethyan carbonate platform by changes in the carbonate factory and by platform drowning. The Altmann Member of the central European, northern Alpine Helvetic thrust and fold belt, contains the sedimentary record of one of these drowning events which occurred during the Late Hauterivian – Early Barremian....

Université de Neuchâtel

New data on the age of the installation of Urgonian-type carbonates along the northern Tethyan margin : biostratigraphy of the Chopf Member (Helvetic Alps, eastern Switzerland) = Données nouvelles sur la datation de l'installation des calcaires urgoniens le long de la marge nord-téthysienne : biostratigraphie du membre du Chopf (nappes Helvétiques, Suisse orientale)

Bodin, Stéphane ; Vermeulen, Jean ; Godet, Alexis ; Föllmi, Karl B.

In: Comptes Rendus Geosciences, 2006, vol. 338, no. 10, p. 727-733

The Chopf Member is a glauconitic, phosphate-bearing succession that occurs in the distal part of the Helvetic Alps (eastern Switzerland). The recent discovery of age-diagnostic ammonites within this horizon allows for its attribution to the lower part of the Gerhardtia sartousiana zone (middle Late Barremian). This new age corresponds to a maximal age for the onset of the Schrattenkalk Fm. in...