Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana
The basement of the Central Andes located in central-western Argentina (31º20′S - 69º22′W) is composed by the Cuyania and Chilenia terranes which were amalgamated to Gondwana in the Early-Mid Paleozoic. Between the Precordillera (Cuyania) and Frontal Cordillera (Chilenia) there are exposures of mari...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_08959811_v88_n_p352_Ariza |
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todo:paper_08959811_v88_n_p352_Ariza2023-10-03T15:43:40Z Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana Ariza, J.P. Boedo, F.L. Sánchez, M.A. Christiansen, R. Pérez Lujan, S.B. Vujovich, G.I. Martínez, P. Aeromagnetic anomalies Argentine Western Precordillera Band ratios Ophiolite Thick-skinned-dominated orogens aeromagnetic survey Devonian Gondwana mafic rock magnetic anomaly ophiolite orogeny Paleozoic remote sensing subduction zone Argentina The basement of the Central Andes located in central-western Argentina (31º20′S - 69º22′W) is composed by the Cuyania and Chilenia terranes which were amalgamated to Gondwana in the Early-Mid Paleozoic. Between the Precordillera (Cuyania) and Frontal Cordillera (Chilenia) there are exposures of marine metasedimentary rocks associated with mafic rocks with an E-MORB chemical signature that represent the remnants of an extensional basin developed between both terranes. The stratigraphic features and the distribution of the Early-Mid Paleozoic units along the Western Precordillera were constrained by remote sensing techniques. This allowed us to identify two stages in the evolution of the sedimentary in-fill of the marine basin: an initial stage (Mid-Late Ordovician) marked by widespread extensional tectonics and a finning-upwards sequence interbedded with volcanic-plutonic mafic rocks; and a Late Ordovician?-Devonian where the sedimentation was characterized by the development of coarsening-upwards sequences with low participation of mafic rocks. Flattened parallel folds associated with pre-Andean thrusts have locally a top-to-the SW vergence. These pre-Andean (Late Devonian) structures are the relics of the Chanic orogen whose double vergence is the result of the control exerted by previous structures related to the ordovician rifting. This is constrained by the residual and regional magnetic anomalies which reflect an important correlation between deep and surface structures. We propose the inception of a subduction zone with an eastward polarity on the proto-Pacific margin of Gondwana as the responsible for the compressive geotectonic framework that led to the closure of the Western Precordillera basin during the Late Devonian and the development of the Chanic thick-skinned-dominated orogen. © 2018 Elsevier Ltd JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v88_n_p352_Ariza |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Aeromagnetic anomalies Argentine Western Precordillera Band ratios Ophiolite Thick-skinned-dominated orogens aeromagnetic survey Devonian Gondwana mafic rock magnetic anomaly ophiolite orogeny Paleozoic remote sensing subduction zone Argentina |
| spellingShingle |
Aeromagnetic anomalies Argentine Western Precordillera Band ratios Ophiolite Thick-skinned-dominated orogens aeromagnetic survey Devonian Gondwana mafic rock magnetic anomaly ophiolite orogeny Paleozoic remote sensing subduction zone Argentina Ariza, J.P. Boedo, F.L. Sánchez, M.A. Christiansen, R. Pérez Lujan, S.B. Vujovich, G.I. Martínez, P. Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana |
| topic_facet |
Aeromagnetic anomalies Argentine Western Precordillera Band ratios Ophiolite Thick-skinned-dominated orogens aeromagnetic survey Devonian Gondwana mafic rock magnetic anomaly ophiolite orogeny Paleozoic remote sensing subduction zone Argentina |
| description |
The basement of the Central Andes located in central-western Argentina (31º20′S - 69º22′W) is composed by the Cuyania and Chilenia terranes which were amalgamated to Gondwana in the Early-Mid Paleozoic. Between the Precordillera (Cuyania) and Frontal Cordillera (Chilenia) there are exposures of marine metasedimentary rocks associated with mafic rocks with an E-MORB chemical signature that represent the remnants of an extensional basin developed between both terranes. The stratigraphic features and the distribution of the Early-Mid Paleozoic units along the Western Precordillera were constrained by remote sensing techniques. This allowed us to identify two stages in the evolution of the sedimentary in-fill of the marine basin: an initial stage (Mid-Late Ordovician) marked by widespread extensional tectonics and a finning-upwards sequence interbedded with volcanic-plutonic mafic rocks; and a Late Ordovician?-Devonian where the sedimentation was characterized by the development of coarsening-upwards sequences with low participation of mafic rocks. Flattened parallel folds associated with pre-Andean thrusts have locally a top-to-the SW vergence. These pre-Andean (Late Devonian) structures are the relics of the Chanic orogen whose double vergence is the result of the control exerted by previous structures related to the ordovician rifting. This is constrained by the residual and regional magnetic anomalies which reflect an important correlation between deep and surface structures. We propose the inception of a subduction zone with an eastward polarity on the proto-Pacific margin of Gondwana as the responsible for the compressive geotectonic framework that led to the closure of the Western Precordillera basin during the Late Devonian and the development of the Chanic thick-skinned-dominated orogen. © 2018 Elsevier Ltd |
| format |
JOUR |
| author |
Ariza, J.P. Boedo, F.L. Sánchez, M.A. Christiansen, R. Pérez Lujan, S.B. Vujovich, G.I. Martínez, P. |
| author_facet |
Ariza, J.P. Boedo, F.L. Sánchez, M.A. Christiansen, R. Pérez Lujan, S.B. Vujovich, G.I. Martínez, P. |
| author_sort |
Ariza, J.P. |
| title |
Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana |
| title_short |
Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana |
| title_full |
Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana |
| title_fullStr |
Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana |
| title_full_unstemmed |
Structural setting of the Chanic orogen (Upper Devonian) at central-western Argentina from remote sensing and aeromagnetic data. Implications in the evolution of the proto-Pacific margin of Gondwana |
| title_sort |
structural setting of the chanic orogen (upper devonian) at central-western argentina from remote sensing and aeromagnetic data. implications in the evolution of the proto-pacific margin of gondwana |
| url |
http://hdl.handle.net/20.500.12110/paper_08959811_v88_n_p352_Ariza |
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