A clockwise P‐T‐t-D path of the northern Patagonia basement: Implications for the Permian evolution of the Panthalassan margin of Gondwana.

• Autores: González, Pablo Diego; Oriolo, Sebastián; Schulz, Bernhard; Naipauer, Maximiliano; Marcos, Paulo; Renda, Emiliano; Cábana, María Cecilia; Krause, Joachim
• Año de publicación: 2024
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias de la Tierra (General); geothermobarometry; petrochronology; monazite; late Paleozoic; Ciencias de la Tierra (General)
• Institución: Universidad Nacional de Río Negro

Fil: González, Pablo Diego. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina
Fil: Oriolo, Sebastián. Department of Geological Sciences, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (UBA-CONICET), Buenos Aires, Argentina
Fil: Schulz, Bernhard. Institute of Mineralogy, Division of Economic Geology and Petrology, TU Bergakademie Freiberg, Freiberg, Germany
Fil: Naipauer, Maximiliano. Instituto de Geocronología y Geología Isotópica, Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires-CONICET, Buenos Aires, Argentina
Fil: Marcos, Paulo. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina
Fil: Renda, Emiliano. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina
Fil: Cábana, María Cecilia. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina
Fil: Krause, Joachim. Helmholtz‐Zentrum Dresden‐ Rossendorf, Helmholtz Institut Freiberg für Ressourcentechnologie, Freiberg, Germany
The geologic evolution of the Gondwanide orogen recorded during the late Palaeozoic along the Panthalassan border of Gondwana is related to an active continental margin, though it is still debatable whether it was built by collision or accretion. To disentangle its orogenic processes and provide constraints on the orogen type, we characterize the physicochemical conditions of metamorphism and associated deformation of the Mina Gonzalito Metamorphic Complex from northern Patagonia (41°28’30” S-65°40’30” W). New field mapping and comprehensive petrochronologic analysis constrain the evolution of a thick-skinned fold and thrust belt in a retroarc setting, which is spatially and temporally related to the geometry and kinematics of the right-lateral reverse El Jagüelito ductile shear zone. Metamorphic evolution resulted in a clockwise P‐T‐t-D path reflecting three stages of continuously changing P-T conditions under high-pressure (8.0–9.9 kbar) amphibolite facies (540–680°C) during a single-phase progressive ductile deformation event. Monazite ages ranging from 303 ± 5 to 252 ± 6 Ma account for the single-phase regional tectono-metamorphic event spanning ~ 50 My. Our results, integrated with regional data, led to interpreting the late Palaeozoic Gondwanide orogen developed along the Panthalassan margin of Gondwana as accretionary in advancing-mode.
The geologic evolution of the Gondwanide orogen recorded during the late Palaeozoic along the Panthalassan border of Gondwana is related to an active continental margin, though it is still debatable whether it was built by collision or accretion. To disentangle its orogenic processes and provide constraints on the orogen type, we characterize the physicochemical conditions of metamorphism and associated deformation of the Mina Gonzalito Metamorphic Complex from northern Patagonia (41°28’30” S-65°40’30” W). New field mapping and comprehensive petrochronologic analysis constrain the evolution of a thick-skinned fold and thrust belt in a retroarc setting, which is spatially and temporally related to the geometry and kinematics of the right-lateral reverse El Jagüelito ductile shear zone. Metamorphic evolution resulted in a clockwise P‐T‐t-D path reflecting three stages of continuously changing P-T conditions under high-pressure (8.0–9.9 kbar) amphibolite facies (540–680°C) during a single-phase progressive ductile deformation event. Monazite ages ranging from 303 ± 5 to 252 ± 6 Ma account for the single-phase regional tectono-metamorphic event spanning ~ 50 My. Our results, integrated with regional data, led to interpreting the late Palaeozoic Gondwanide orogen developed along the Panthalassan margin of Gondwana as accretionary in advancing-mode.