Benzaggagh, M. (2011) Submarine volcanism activities at the Jurassic-Cretaceous boundary in the external Rif chain (Morocco). Age and relationship with sedimentation and the palaeogeography of the external riffian trough Activitè s volcaniques sous-marines à la limite Jurassique-Crè tacè dansle Rif externe (Maroc). Â ge et relation avec la sèdimentatioetlapalèogèographiedu sillon rifain externe. Comptes Rendus - Geoscience, 343 (4). pp. 302-311.

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Following the recent stratigraphic works carried out on the Jurassic-Cretaceous boundary in the external Rif chain (Mesorif area and Bou Haddoud nappe), numerous submarine volcanism traces have been discovered in Upper Oxfordian to Upper Berriasian deposits. These traces display various aspects: volcaniclastic complexes incorporated within Upper Berriasian marls; volcanic lavas and basalt clasts included in the breccias with clay matrix of Upper Oxfordian to Lower Berriasian age, or in brecciated Lower Tothonian calcareous beds of the Early Tithonian. These submarine volcanic activities took place in a carbonate platform environment during the Kimmeridgian to Early Tithonian interval or in a pelagic basin from Late Tithonian onwards. They caused an intense brecciation of Upper Jurassic carbonate formations and a general dismantling of marly calcareous alternations of Upper Tithonian-Lower Berriasian. Therefore, the Upper Tithonian-Lower Berriasian deposits are marked by frequent stratigraphic gaps in many outcrops of Mesorif, Prerif areas and in the Bou Haddoud nappe. © 2011 Académie des sciences.

Item Type: Article
Uncontrolled Keywords: basalt; carbonate platform; Jurassic-Cretaceous boundary; lava; nappe; paleoenvironment; paleogeography; sedimentation; stratigraphic correlation; stratigraphy; trough; volcaniclastic deposit; volcanism, Morocco; Rif
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46

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