Highly extended terrains, lateral segmentation of the substratum, and basin development: The middle‐late Miocene Radicondoli Basin (inner northern Apennines, Italy)
Identifieur interne : 000307 ( Main/Exploration ); précédent : 000306; suivant : 000308Highly extended terrains, lateral segmentation of the substratum, and basin development: The middle‐late Miocene Radicondoli Basin (inner northern Apennines, Italy)
Auteurs : Andrea Brogi [Italie] ; Domenico Liotta [Italie]Source :
- Tectonics [ 0278-7407 ] ; 2008-10.
Abstract
This paper deals with the evolution of sedimentary basins not delimited by normal faults, with a substratum characterized by an upward concave shape and with infilling sediments synclinally deformed. We describe the middle‐late Miocene Radicondoli Basin, representing an example of such bowl‐shaped basins. Its tectonic origin is controversial, being related both to compression and extension; these opposite interpretations bear significant consequences on the geodynamic context in which the inner northern Apennines developed during the middle‐late Miocene. The results of our structural studies, carried out in the substratum and infilling sediments, indicate that the Radicondoli Basin is an example of a hanging wall basin developed in an extensional setting. Extensional tectonics determined the lateral segmentation of the substratum competent levels (i.e., Tuscan Nappe and Verrucano Group) and the consequent collapse of overlying less competent levels (i.e., the Ligurian units) with the formation of a bowl‐shaped tectonic depression. Here, the syntectonic sediments (Serravallian–late Messinian) are deformed in a large syncline, characterized by minor gravity‐driven folds, with vergences toward the depocenter and traces of their axial planes parallel to the basin margins. This paper highlights the role of the competence contrast during the postcollisional tectonic evolution and the influence of substratum lateral segmentation for the accommodation of syntectonic sediments.
Url:
DOI: 10.1029/2007TC002188
Affiliations:
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<front><div type="abstract">This paper deals with the evolution of sedimentary basins not delimited by normal faults, with a substratum characterized by an upward concave shape and with infilling sediments synclinally deformed. We describe the middle‐late Miocene Radicondoli Basin, representing an example of such bowl‐shaped basins. Its tectonic origin is controversial, being related both to compression and extension; these opposite interpretations bear significant consequences on the geodynamic context in which the inner northern Apennines developed during the middle‐late Miocene. The results of our structural studies, carried out in the substratum and infilling sediments, indicate that the Radicondoli Basin is an example of a hanging wall basin developed in an extensional setting. Extensional tectonics determined the lateral segmentation of the substratum competent levels (i.e., Tuscan Nappe and Verrucano Group) and the consequent collapse of overlying less competent levels (i.e., the Ligurian units) with the formation of a bowl‐shaped tectonic depression. Here, the syntectonic sediments (Serravallian–late Messinian) are deformed in a large syncline, characterized by minor gravity‐driven folds, with vergences toward the depocenter and traces of their axial planes parallel to the basin margins. This paper highlights the role of the competence contrast during the postcollisional tectonic evolution and the influence of substratum lateral segmentation for the accommodation of syntectonic sediments.</div>
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