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Université de Fribourg

Early diagenetic dolomitization and dedolomitization of Late Jurassic and earliest Cretaceous platform carbonates: A case study from the Jura Mountains (NW Switzerland, E France)

Rameil, Niels

In: Sedimentary Geology, 2008, vol. 212, no. 1-4, p. 70-85

Early diagenetic dolomitization is a common feature in cyclic shallow-water carbonates throughout the geologic record. After their generation, dolomites may be subject to dedolomitization (re-calcification of dolomites), e.g. by contact with meteoric water during emersion. These patterns of dolomitization and subsequent dedolomitization frequently play a key role in unravelling the development...

Université de Fribourg

High-frequency palaeoenvironmental changes in mixed carbonate-siliciclastic sedimentary systems (Late Oxfordian, Switzerland, France, and southern Germany)

Védrine, Stéphanie ; Strasser, André (Dir.)

Thèse de doctorat : Université de Fribourg, 2007 ; no 1579.

The main goal of this study is to monitor the highfrequency palaeoenvironmental changes occurring during a marine transgression in mixed carbonatesiliciclastic sedimentary systems. Based on a wellestablished bio- and sequence-stratigraphic framework, a narrow time window in the Bimammatum Zone of the Late Oxfordian is investigated. Seven shallow platform sections (Swiss Jura, Lorraine), two deep...

Université de Fribourg

Turonian radiolarians from Karnezeika, Argolis peninsula, Peloponnesus (Greece)

Bandini, Alexandre N. ; Baumgartner, Peter O. ; Caron, Michèle

In: Eclogae Geologicae Helvetiae, 2006, vol. 99, no. Supplement 1, p. S1-S20

Near Karnezeika a roughly 140 m thick Upper Cretaceous section consists of interbedded pelagic limestones, cherts and coarse polymict breccias including ophiolites and shallow water limestones. At the base, pink pelagic limestones rest on deeply altered and fractured Lower Jurassic Pantokrator Limestone. This first pelagic facies is dated as middle Turonian, based on planktonic Foraminifera. Over...

Université de Fribourg

From platform to basin to swell: orbital control on sedimentary sequences in the Oxfordian, Spain

Strasser, André ; Aurell, Marc ; Bádenas, Beatriz ; Meléndez, Guillermo ; Tomás, Sara

In: Terra Nova, 2005, vol. 17(5), p. 407

Climatic, oceanographic and ecological changes that control the formation and deposition of sediment in shallow and deep depositional environments commonly occur with periodicities of a few 10 000 years. Consequently, in order to interpret sedimentary sequences in the geological past, high time resolution is required. This is best obtained by cyclostratigraphy. Three sections have been studied in...

Université de Fribourg

La limite Cénomanien-Turonien dans le Haut Atlas central, Maroc = The Cenomanian-Turonian boundary in the Central High Atlas, Morocco

Ettachfini, El Mostafa ; Souhel, Abdellatif ; Andreu, Bernard ; Caron, Michèle

In: Geobios, 2005, vol. 38, no. 1, p. 57-68

Sur la bordure nord du Haut Atlas central, de nouvelles observations lithologiques et biostratigraphiques effectuées en particulier dans le synclinal de Naour, permettent de cerner avec précision la limite Cénomanien-Turonien. La reconnaissance dans cette structure d'une succession apparemment complète de l'intervalle Cénomanien supérieur-Turonien, la série de Ben Cherrou, nous incite à...

Université de Fribourg

Subduction and obduction processes in the Swiss Alps

Stampfli, G. M. ; Mosar, Jon ; Marquer, D. ; Marchant, R. ; Baudin, T. ; Borel, G.

In: Tectonophysics, 1998, vol. 296, p. 159

The significance of the Briançonnais domain in the Alpine orogen is reviewed in the light of data concerning its collision with the active Adriatic margin and the passive Helvetic margin. The Briançonnais which formerly belonged to the Iberian plate, was located on the northern margin of the Alpine Tethys (Liguro-Piémont ocean) since its opening in the early-Middle Jurassic. Together with the...