Cretaceous crustal thinning in North Africa: Implications for magmatic and thermal events in the Eastern Tunisian margin and the Pelagic Sea |
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| Institution: | 1. Hoshinooka Cardiovascular Clinic, Japan;2. Department of Internal Medicine, Yoshino Hospital, Japan;3. Division of Cardiology, Department of Integrated Medicine and Informatics, Ehime University Graduate School of Medicine, Japan;4. Department of Radiology, Ehime University Graduate School of Medicine, Japan;5. Division of Cardiology, Uwajima City Hospital, Japan;1. Faculty of Earth Sciences, Geo-exploration Department, King Abdulaziz University KAU, Jeddah, Saudi Arabia;2. IFP-Energies Nouvelles, Rueil-Malmaison, France;3. Faculté des sciences de Tunis, Al Manar University, Tunis, Tunisia;4. Centre d''études recherches et technologies des eaux CERTE, Labo Géoresources, Technopole Borj Cedria/University of Carthage. Tunisia;5. Reservoir Department, ETAP, Entreprise Tunisienne des Activités Pétrolières, Tunis, Tunisia |
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| Abstract: | The integrated use of geological, geophysical, and geochemical data from Eastern Tunisia onshore and offshore samples indicate a crustal thinning induced from the Tethyan rifting. This is responsible for the subsequent evolution of the North African passive margin during the Late Cretaceous, and the creation of the fold–thrust belt and associated foreland deformations. This thinned crust was an area of mantle upwelling that favoured the increase of isotherms, the uprise of basalt magma, and the circulation of hydrothermal fluids. The Cretaceous magmatism generated a major hydrothermal event characterised by the circulation of hot fluids along faults and a relatively high heat flow in the basin. Temperature elevation and hydrothermal conditions led to alteration of basalts and generated a new mineral equilibrium around the enclosing sedimentary deposits. |
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