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| Steiger, T; Cousin, M. |
| The Jurassic and Lower Cretaceous carbonate platform of the Mazagan submarine plateau is composed of 3 main facies units: Facies A comprises neritic shallow marine lithologies of the Oxfordian to Kimmeridgian carbonate ramp and the beginning of the Tithonian carbonate platform. Facies B contains hemipelagic sediments which are the result of platform defacing processes mixed with pelagic influx. Facies C is composed of intertidal to shallow subtidal sediments, deposited on the top of the platform. The depositional history of the carbonate platform is strongly influenced by blockfaulting and sea level changes. During the formation of the Mazagan Escarpment subsiding marginal blocks developed a steep slope composed of numerous steps of different vertical and... |
| Tipo: Text |
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| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/00247/35835/34345.pdf |
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| Lang, B; Steiger, T. |
| During the CYAMAZ deep diving project, two well preserved Upper Jurassic siliceous sponges were recovered from columnar stromatolitic peloidal packstones which constitute the main lithology at the Mazagan Escarpment. These sponges belong to the genera Thyroidium leptophyllum (Quenstedt) and Paracraticularia sp. Thyroidium leptophyllum is known to be not younger than Kimmeridgian. This sponge is thus an important fossil for dating the massive core of the Mazagan platform margin. Thin-sections of other samples show that siliceous sponges are not limited to the stromatolitic peloidal facies, but were also found in hemipelagic calpionellid limestones. Diagenesis of the siliceous sponges is characterized by the dissolution of the skeletal lattice at different... |
| Tipo: Text |
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| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/00247/35837/34347.pdf |
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