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title of the reference :
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Progresive neogene deformation of southern Hedil, Tunisian Atlas.
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Publication Date:
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1980
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Author :
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Cohen Curtis R., Schamel Steven
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Catalogue type :
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Livre
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Catalogue reference :
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Vol.64, N°3 (USA) AAPG Bull. Vol.64, N°3 Progresive neogene deformation of southern Hedil, Tunisian Atlas. Detailed structural mapping in the southern Hédil region of the northern Tunisian Atlas suggests that the area is characterized by multiple-faulted folds, facing southeast, rather than by the nappes and imbricate thrusts of previous interpretations. Our structural analysis shows that major deformation occurred during the middle Miocene (Langhian-Serravallian). This deformation was progressive and occurred in two discrete phases. In the first phase, shelftype rocks of Late Cretaceous-early Miocene age were involved in kink-style folding which developed above a gliding surface in Triassic evaporites to from nourtheast-trending structures. The second phase produced conjugate strike-slip and extensional faulting in these structures. The acute bisectrix of the strike-slip faults, at right angles to the major trends of folding and parallel with the extensional faults, suggests that the maximum principal compressive stress (?1)was directed S38°E and was constant during middle Miocene deformation. This faulted-fold concept contrasts with that suggested in other studies in which the sequence of events is envisioned as faulting followed by folding.
pli ; faille ; compression tectonique ; Néogène ; Tunisie ; Tunisie Nord Occidentale ; Hédil Cohen Curtis R. Schamel Steven Tectonique
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Indexation decimale :
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Tectonique
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Keywords :
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pli ; faille ; compression tectonique ; Néogène ; Tunisie ; Tunisie Nord Occidentale ; Hédil
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Summary :
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Detailed structural mapping in the southern Hédil region of the northern Tunisian Atlas suggests that the area is characterized by multiple-faulted folds, facing southeast, rather than by the nappes and imbricate thrusts of previous interpretations. Our structural analysis shows that major deformation occurred during the middle Miocene (Langhian-Serravallian). This deformation was progressive and occurred in two discrete phases. In the first phase, shelftype rocks of Late Cretaceous-early Miocene age were involved in kink-style folding which developed above a gliding surface in Triassic evaporites to from nourtheast-trending structures. The second phase produced conjugate strike-slip and extensional faulting in these structures. The acute bisectrix of the strike-slip faults, at right angles to the major trends of folding and parallel with the extensional faults, suggests that the maximum principal compressive stress (?1)was directed S38°E and was constant during middle Miocene deformation. This faulted-fold concept contrasts with that suggested in other studies in which the sequence of events is envisioned as faulting followed by folding.
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Exemplaries :
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TU485A, TU485B
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