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Discussion papers | Copyright
https://doi.org/10.5194/se-2018-50
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Research article 27 Jun 2018

Research article | 27 Jun 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Influence of basement heterogeneity on the architecture of low subsidence rate Paleozoic intracratonic basins (Ahnet and Mouydir basins, Central Sahara)

Paul Perron1, Michel Guiraud1, Emmanuelle Vennin1, Isabelle Moretti2, Éric Portier3, Laetitia Le Pourhiet4, and Moussa Konaté5 Paul Perron et al.
  • 1Université de Bourgogne Franche-Comté, Centre des Sciences de la Terre, UMR CNRS 6282 Biogéosciences, 6 Bd Gabriel, 21000 Dijon, France
  • 2ENGIE, Département Exploration & Production, 1, place Samuel de Champlain, Faubourg de l'Arche, 92930 Paris La Défense, France
  • 3NEPTUNE Energy International S.A., 9-11 Allée de l'Arche – Tour EGEE – 92400 Courbevoie, France
  • 4Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP UMR 7193, 75005 Paris, France
  • 5Département de Géologie, Université Abdou Moumouni de Niamey, BP: 10662, Niamey, Niger

Abstract. The Paleozoic intracratonic North African Platform is characterized by an association of arches (ridges, domes, swells or paleo-highs) and low subsidence rate syncline basins of different wavelengths (75–620km). The structural framework of the platform results from the accretion of Archean and Proterozoic terranes during the Pan-African orogeny (750–580Ma). The Ahnet and Mouydir basins are successively delimited from east to west by the Amguid El Biod, Arak-Foum Belrem, and Azzel Matti arches, bounded by inherited Precambrian sub-vertical fault systems which were repeatedly reactivated or inverted during the Paleozoic. Major unconformities are related to several tectonic events such as the Cambrian–Ordovician extension, Ordovician–Silurian glacial rebound, Silurian–Devonian “Caledonian” extension/compression, late Devonian extension/compression, and “Hercynian” compression. The deposits associated with these arches and syncline basins exhibit thickness variations and facies changes ranging from continental to marine environments. The arches are characterized by thin amalgamated deposits with condensed and erosional surfaces, whereas the syncline basins exhibit thicker and well-preserved successions. In addition, the vertical facies succession evolves from thin Silurian to Givetian deposits into thick Upper Devonian sediments. Synsedimentary deformations are evidenced by wedges, truncations, and divergent onlaps. Locally, deformation is characterized by near-vertical planar normal faults responsible for horst and graben structuring associated with folding during the Cambrian–Ordovician–Silurian period. These structures may have been inverted or activated during the Devonian compression and the Carboniferous. The sedimentary infilling pattern and the nature of deformation result from the slow Paleozoic reactivation of Precambrian terranes bounded by vertical lithospheric fault zones. Alternating periods of tectonic quiescence and low-rate subsidence acceleration associated with extension and local inversion tectonics correspond to a succession of Paleozoic geodynamic events (i.e. far-field orogenic belt, glaciation).

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We present in this manuscript an original multi-disciplinary workflow involving various tools (e.g. seismic profiles, satellite images, well-logs) and techniques (e.g. photo-geology, seismic interpretation, well correlation, geophysics, geochronology, backstripping) as a basis for discussing the potential factors controlling the tectono-stratigraphic architecture within the Palaeozoic intracratonic basins of the Saharan Platform through the example of the Ahnet and Mouydir basins.
We present in this manuscript an original multi-disciplinary workflow involving various tools...
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