Tectono-thermal history of the intraplate ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Tectono-thermal history of the intraplate San Bernardo fold and thrust belt in central Patagonia inferred by low-temperature thermochronology
Auteur(s) :
Genge, Marie [Auteur]
Derycke, Alexis [Auteur]
Géosciences Paris Saclay [GEOPS]
Gautheron, Cécile [Auteur]
Géosciences Paris Saclay [GEOPS]
Zattin, Massimiliano [Auteur]
Witt, César [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Mazzoli, Stefano [Auteur]
Quidelleur, Xavier [Auteur]
Géosciences Paris Saclay [GEOPS]
Derycke, Alexis [Auteur]
Géosciences Paris Saclay [GEOPS]
Gautheron, Cécile [Auteur]
Géosciences Paris Saclay [GEOPS]
Zattin, Massimiliano [Auteur]
Witt, César [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Mazzoli, Stefano [Auteur]
Quidelleur, Xavier [Auteur]
Géosciences Paris Saclay [GEOPS]
Titre de la revue :
Journal of South American Earth Sciences
Éditeur :
Elsevier
Date de publication :
2021
ISSN :
0895-9811
Mot(s)-clé(s) en anglais :
Low-temperature thermochronology
Broken foreland
Intraplate magmatism
Patagonia
Broken foreland
Intraplate magmatism
Patagonia
Discipline(s) HAL :
Planète et Univers [physics]
Planète et Univers [physics]/Sciences de la Terre
Planète et Univers [physics]/Sciences de la Terre
Résumé en anglais : [en]
First low-temperature thermochronology data across the central Patagonia and thermal modeling provide information on the thermal history of the intraplate San Bernardo fold and thrust belt (44-46 °S). Apatite (U-Th-Sm)/He ...
Lire la suite >First low-temperature thermochronology data across the central Patagonia and thermal modeling provide information on the thermal history of the intraplate San Bernardo fold and thrust belt (44-46 °S). Apatite (U-Th-Sm)/He (AHe), fission tracks (AFT) ages and inverse thermal modeling indicate that the sedimentary rocks presently at the surface of the southwestern San Bernardo FTB have experienced a broadly similar thermal history: i) cooling at the deposition time during the Cretaceous, ii) a significant Eocene - early Miocene thermal event which totally reset the AHe data and partially the AFT data, and iii) a cooling since the early Miocene. Although former thermochronology studies in surrounding areas do not evidence any Neogene thermal event, our regionally consistent ages and thermal modeling most likely indicate a large-scale thermal event through the Eocene to the early Miocene. As sedimentary burial was not significant in this area through the Cenozoic, we propose that this heating episode might have been caused by coeval widespread and long-term intraplate volcanic processes associated with a modest burial and the increase of the geothermal gradient in the entire area, which has been strong enough to significantly affect the low-temperature thermochronometers regionally. A subsequent slow cooling phase starting from early Miocene may have been related with the termination of this intraplate volcanic phase and subsequent decrease of the thermal gradient to average values, and with a modest exhumation of ~1 km at most related to a mild deformation episode of the broken foreland and dynamic topography processes during the middle-late Miocene, as well as the weathering of the Oligo-Miocene basalts.Lire moins >
Lire la suite >First low-temperature thermochronology data across the central Patagonia and thermal modeling provide information on the thermal history of the intraplate San Bernardo fold and thrust belt (44-46 °S). Apatite (U-Th-Sm)/He (AHe), fission tracks (AFT) ages and inverse thermal modeling indicate that the sedimentary rocks presently at the surface of the southwestern San Bernardo FTB have experienced a broadly similar thermal history: i) cooling at the deposition time during the Cretaceous, ii) a significant Eocene - early Miocene thermal event which totally reset the AHe data and partially the AFT data, and iii) a cooling since the early Miocene. Although former thermochronology studies in surrounding areas do not evidence any Neogene thermal event, our regionally consistent ages and thermal modeling most likely indicate a large-scale thermal event through the Eocene to the early Miocene. As sedimentary burial was not significant in this area through the Cenozoic, we propose that this heating episode might have been caused by coeval widespread and long-term intraplate volcanic processes associated with a modest burial and the increase of the geothermal gradient in the entire area, which has been strong enough to significantly affect the low-temperature thermochronometers regionally. A subsequent slow cooling phase starting from early Miocene may have been related with the termination of this intraplate volcanic phase and subsequent decrease of the thermal gradient to average values, and with a modest exhumation of ~1 km at most related to a mild deformation episode of the broken foreland and dynamic topography processes during the middle-late Miocene, as well as the weathering of the Oligo-Miocene basalts.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
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