Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina...

Autores: Canelo, Horacio N.; Assadourian, Assadour D. Torossian; Dávila, Federico M.; Juárez, Oscar E.; Giménez, Mario E.; Miguel, Roberto Esteban
Año de publicación: 2026
Idioma: inglés
Tipo de recurso: artículo
Estado: versión publicada
Descripción: This study investigates the structural architecture and neotectonics of a region in the eastern piedmont of the Famatina and Sañogasta ranges in the Sierras Pampeanas, central-western Argentina. The area has undergone W-E horizontal compression since the Neogene. Despite its geodynamic importance as part of the southern Central Andes under Pampean flat-slab subduction, its structural and neotectonic framework remains poorly understood. Prior research has focused primarily on lithostratigraphy and geomorphology. This study provides a novel structural synthesis to explain Quaternary deformation and ongoing morphotectonic evolution in this setting. Through geologic mapping, remote sensing, GPS surveys, and aeromagnetic data, we identify a system of ∼N/S-striking, basement-involved blind reverse faults. These include east-vergent backthrusts linked to the Sañogasta Range uplift and a major west-vergent fault, collectively forming a thick-skinned triangle zone. Flexural scarps, deformed terraces, sag ponds, and drainage anomalies evidence neotectonic activity. The distribution of the “conglomerados amarillos” unit reveals a major Pleistocene-Holocene reorganization of the drainage of the El Oro River. This unit records an acidic paleodrainage system sourced from the Nevados de Famatina Mining District. The subsequent uplift of the Bordo de Guanchín-Sañogasta hill in the Pleistocene-Holocene era diverted the river from its original path toward the Lomadas de Nonogasta hills, redirecting it to its present course near Chilecito City. This work establishes a structural framework for Quaternary deformation during ongoing flat-slab subduction. However, limitations persist due to the blind nature of faults and a lack of high-resolution geophysical and geochronological data to quantify shortening rates and seismic recurrence.
EEA Chilecito
Fil: Canelo, Horacio N. Comisión Nacional de Energía Atómica (CNEA). Gerencia de Exploración de Materias Primas. Subgerencia Regional Patagonia; Argentina
Fil: Assadourian, Assadour D. Torossian. Universitat de Barcelona. Facultat de Geologia; España
Fil: Dávila, Federico M. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Dávila, Federico M. Universidad Nacional de Córdoba. Centro de Investigaciones en Ciencias de la Tierra; Argentina
Fil: Juárez, Oscar E. Universidad Nacional de Chilecito. Instituto de Ambientes de Montaña y Regiones Áridas; Argentina
Fil: Giménez, Mario E. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Geofísico Sismológico Volponi; Argentina
Fil: Giménez, Mario E. Universidad Nacional de San Juan. Instituto Geofísico Sismológico Volponi; Argentina
Fil: Miguel, Roberto Esteban. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Chilecito; Argentina
Fuente: Tectonophysics 935 : 231279. (August 2026)
Materia: Geología
Teledetección
La Rioja
Geomorfología
Geology
Remote Sensing
Geomorphology
Famatina, La Rioja
Sañogasta, La Rioja
Nivel de accesibilidad: acceso restringido
Condiciones de uso: http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
Institución: Instituto Nacional de Tecnología Agropecuaria
OAI Identificador: oai:localhost:20.500.12123/26499

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spelling	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), ArgentinaCanelo, Horacio N.Assadourian, Assadour D. TorossianDávila, Federico M.Juárez, Oscar E.Giménez, Mario E.Miguel, Roberto EstebanGeologíaTeledetecciónLa RiojaGeomorfologíaGeologyRemote SensingGeomorphologyFamatina, La RiojaSañogasta, La RiojaThis study investigates the structural architecture and neotectonics of a region in the eastern piedmont of the Famatina and Sañogasta ranges in the Sierras Pampeanas, central-western Argentina. The area has undergone W-E horizontal compression since the Neogene. Despite its geodynamic importance as part of the southern Central Andes under Pampean flat-slab subduction, its structural and neotectonic framework remains poorly understood. Prior research has focused primarily on lithostratigraphy and geomorphology. This study provides a novel structural synthesis to explain Quaternary deformation and ongoing morphotectonic evolution in this setting. Through geologic mapping, remote sensing, GPS surveys, and aeromagnetic data, we identify a system of ∼N/S-striking, basement-involved blind reverse faults. These include east-vergent backthrusts linked to the Sañogasta Range uplift and a major west-vergent fault, collectively forming a thick-skinned triangle zone. Flexural scarps, deformed terraces, sag ponds, and drainage anomalies evidence neotectonic activity. The distribution of the “conglomerados amarillos” unit reveals a major Pleistocene-Holocene reorganization of the drainage of the El Oro River. This unit records an acidic paleodrainage system sourced from the Nevados de Famatina Mining District. The subsequent uplift of the Bordo de Guanchín-Sañogasta hill in the Pleistocene-Holocene era diverted the river from its original path toward the Lomadas de Nonogasta hills, redirecting it to its present course near Chilecito City. This work establishes a structural framework for Quaternary deformation during ongoing flat-slab subduction. However, limitations persist due to the blind nature of faults and a lack of high-resolution geophysical and geochronological data to quantify shortening rates and seismic recurrence.EEA ChilecitoFil: Canelo, Horacio N. Comisión Nacional de Energía Atómica (CNEA). Gerencia de Exploración de Materias Primas. Subgerencia Regional Patagonia; ArgentinaFil: Assadourian, Assadour D. Torossian. Universitat de Barcelona. Facultat de Geologia; EspañaFil: Dávila, Federico M. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaFil: Dávila, Federico M. Universidad Nacional de Córdoba. Centro de Investigaciones en Ciencias de la Tierra; ArgentinaFil: Juárez, Oscar E. Universidad Nacional de Chilecito. Instituto de Ambientes de Montaña y Regiones Áridas; ArgentinaFil: Giménez, Mario E. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Geofísico Sismológico Volponi; ArgentinaFil: Giménez, Mario E. Universidad Nacional de San Juan. Instituto Geofísico Sismológico Volponi; ArgentinaFil: Miguel, Roberto Esteban. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Chilecito; ArgentinaElsevier2026-06-05T11:47:42Z2026-06-05T11:47:42Z2026-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/26499https://www.sciencedirect.com/science/article/abs/pii/S00401951260021310040-19511879-3266https://doi.org/10.1016/j.tecto.2026.231279Tectonophysics 935 : 231279. (August 2026)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología AgropecuariaengFamatina, Sierra de .......... (mountains) (World, South America, Argentina, La Rioja)1109027Sañogasta .......... (inhabited place) (World, South America, Argentina, La Rioja)1019958info:eu-repo/semantics/restrictedAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)2026-06-11T09:54:46Zoai:localhost:20.500.12123/26499instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2026-06-11 09:54:46.599INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse
dc.title.none.fl_str_mv	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina
title	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina
spellingShingle	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina Canelo, Horacio N. Geología Teledetección La Rioja Geomorfología Geology Remote Sensing Geomorphology Famatina, La Rioja Sañogasta, La Rioja
title_short	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina
title_full	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina
title_fullStr	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina
title_full_unstemmed	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina
title_sort	Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina
dc.creator.none.fl_str_mv	Canelo, Horacio N. Assadourian, Assadour D. Torossian Dávila, Federico M. Juárez, Oscar E. Giménez, Mario E. Miguel, Roberto Esteban
author	Canelo, Horacio N.
author_facet	Canelo, Horacio N. Assadourian, Assadour D. Torossian Dávila, Federico M. Juárez, Oscar E. Giménez, Mario E. Miguel, Roberto Esteban
author_role	author
author2	Assadourian, Assadour D. Torossian Dávila, Federico M. Juárez, Oscar E. Giménez, Mario E. Miguel, Roberto Esteban
author2_role	author author author author author
dc.subject.none.fl_str_mv	Geología Teledetección La Rioja Geomorfología Geology Remote Sensing Geomorphology Famatina, La Rioja Sañogasta, La Rioja
topic	Geología Teledetección La Rioja Geomorfología Geology Remote Sensing Geomorphology Famatina, La Rioja Sañogasta, La Rioja
dc.description.none.fl_txt_mv	This study investigates the structural architecture and neotectonics of a region in the eastern piedmont of the Famatina and Sañogasta ranges in the Sierras Pampeanas, central-western Argentina. The area has undergone W-E horizontal compression since the Neogene. Despite its geodynamic importance as part of the southern Central Andes under Pampean flat-slab subduction, its structural and neotectonic framework remains poorly understood. Prior research has focused primarily on lithostratigraphy and geomorphology. This study provides a novel structural synthesis to explain Quaternary deformation and ongoing morphotectonic evolution in this setting. Through geologic mapping, remote sensing, GPS surveys, and aeromagnetic data, we identify a system of ∼N/S-striking, basement-involved blind reverse faults. These include east-vergent backthrusts linked to the Sañogasta Range uplift and a major west-vergent fault, collectively forming a thick-skinned triangle zone. Flexural scarps, deformed terraces, sag ponds, and drainage anomalies evidence neotectonic activity. The distribution of the “conglomerados amarillos” unit reveals a major Pleistocene-Holocene reorganization of the drainage of the El Oro River. This unit records an acidic paleodrainage system sourced from the Nevados de Famatina Mining District. The subsequent uplift of the Bordo de Guanchín-Sañogasta hill in the Pleistocene-Holocene era diverted the river from its original path toward the Lomadas de Nonogasta hills, redirecting it to its present course near Chilecito City. This work establishes a structural framework for Quaternary deformation during ongoing flat-slab subduction. However, limitations persist due to the blind nature of faults and a lack of high-resolution geophysical and geochronological data to quantify shortening rates and seismic recurrence. EEA Chilecito Fil: Canelo, Horacio N. Comisión Nacional de Energía Atómica (CNEA). Gerencia de Exploración de Materias Primas. Subgerencia Regional Patagonia; Argentina Fil: Assadourian, Assadour D. Torossian. Universitat de Barcelona. Facultat de Geologia; España Fil: Dávila, Federico M. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Ciencias de la Tierra; Argentina Fil: Dávila, Federico M. Universidad Nacional de Córdoba. Centro de Investigaciones en Ciencias de la Tierra; Argentina Fil: Juárez, Oscar E. Universidad Nacional de Chilecito. Instituto de Ambientes de Montaña y Regiones Áridas; Argentina Fil: Giménez, Mario E. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Geofísico Sismológico Volponi; Argentina Fil: Giménez, Mario E. Universidad Nacional de San Juan. Instituto Geofísico Sismológico Volponi; Argentina Fil: Miguel, Roberto Esteban. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Chilecito; Argentina
description	This study investigates the structural architecture and neotectonics of a region in the eastern piedmont of the Famatina and Sañogasta ranges in the Sierras Pampeanas, central-western Argentina. The area has undergone W-E horizontal compression since the Neogene. Despite its geodynamic importance as part of the southern Central Andes under Pampean flat-slab subduction, its structural and neotectonic framework remains poorly understood. Prior research has focused primarily on lithostratigraphy and geomorphology. This study provides a novel structural synthesis to explain Quaternary deformation and ongoing morphotectonic evolution in this setting. Through geologic mapping, remote sensing, GPS surveys, and aeromagnetic data, we identify a system of ∼N/S-striking, basement-involved blind reverse faults. These include east-vergent backthrusts linked to the Sañogasta Range uplift and a major west-vergent fault, collectively forming a thick-skinned triangle zone. Flexural scarps, deformed terraces, sag ponds, and drainage anomalies evidence neotectonic activity. The distribution of the “conglomerados amarillos” unit reveals a major Pleistocene-Holocene reorganization of the drainage of the El Oro River. This unit records an acidic paleodrainage system sourced from the Nevados de Famatina Mining District. The subsequent uplift of the Bordo de Guanchín-Sañogasta hill in the Pleistocene-Holocene era diverted the river from its original path toward the Lomadas de Nonogasta hills, redirecting it to its present course near Chilecito City. This work establishes a structural framework for Quaternary deformation during ongoing flat-slab subduction. However, limitations persist due to the blind nature of faults and a lack of high-resolution geophysical and geochronological data to quantify shortening rates and seismic recurrence.
publishDate	2026
dc.date.none.fl_str_mv	2026-06-05T11:47:42Z 2026-06-05T11:47:42Z 2026-08
dc.type.none.fl_str_mv	info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo
format	article
status_str	publishedVersion
dc.identifier.none.fl_str_mv	http://hdl.handle.net/20.500.12123/26499 https://www.sciencedirect.com/science/article/abs/pii/S0040195126002131 0040-1951 1879-3266 https://doi.org/10.1016/j.tecto.2026.231279
url	http://hdl.handle.net/20.500.12123/26499 https://www.sciencedirect.com/science/article/abs/pii/S0040195126002131 https://doi.org/10.1016/j.tecto.2026.231279
identifier_str_mv	0040-1951 1879-3266
dc.language.none.fl_str_mv	eng
language	eng
dc.rights.none.fl_str_mv	info:eu-repo/semantics/restrictedAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv	restrictedAccess
rights_invalid_str_mv	http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv	application/pdf
dc.coverage.none.fl_str_mv	Famatina, Sierra de .......... (mountains) (World, South America, Argentina, La Rioja) 1109027 Sañogasta .......... (inhabited place) (World, South America, Argentina, La Rioja) 1019958
dc.publisher.none.fl_str_mv	Elsevier
publisher.none.fl_str_mv	Elsevier
dc.source.none.fl_str_mv	Tectonophysics 935 : 231279. (August 2026) reponame:INTA Digital (INTA) instname:Instituto Nacional de Tecnología Agropecuaria
reponame_str	INTA Digital (INTA)
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repository.mail.fl_str_mv	tripaldi.nicolas@inta.gob.ar
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Structural framework, evidence of neotectonic activity and drainage reorganization in the eastern piedmont of Famatina-Sañogasta ranges (latitudes 29°15′— 29°35′S), Argentina...

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