Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index

The thermal post-depositional evolution of metapelitic and metavolcanic rocks of the upper Cambrian Ordovician succession in the Central Andes of northwestern Argentina, was estimated through X ray diffraction of clay mineral analysis, Kübler Index (KI), SEM-EDS study of selected samples and chlorit...

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Autores: Do Campo, Margarita, Nieto, Fernando, Albanesi, Guillermo L., Ortega, Gladys, Monaldi, C. Rubén
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/361944
Acceso en línea:http://hdl.handle.net/10261/361944
Access Level:acceso abierto
Palabra clave:Chlorite
Geothermometry
Low-grade metamorphism
Retrodiagenesis
riásico, Subducción, Pre-andino, Cordillera frontal, Geoquímica.
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repository_id_str
dc.title.none.fl_str_mv Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
Determinación de la historia térmica posdepositacional de las sucesiones ordovícicas del noroeste de Argentina mediante análisis de arcillas, geotermometría de la clorita e índice de Kübler
title Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
spellingShingle Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
Do Campo, Margarita
Chlorite
Geothermometry
Low-grade metamorphism
Retrodiagenesis
riásico, Subducción, Pre-andino, Cordillera frontal, Geoquímica.
title_short Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
title_full Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
title_fullStr Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
title_full_unstemmed Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
title_sort Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler index
dc.creator.none.fl_str_mv Do Campo, Margarita
Nieto, Fernando
Albanesi, Guillermo L.
Ortega, Gladys
Monaldi, C. Rubén
author Do Campo, Margarita
author_facet Do Campo, Margarita
Nieto, Fernando
Albanesi, Guillermo L.
Ortega, Gladys
Monaldi, C. Rubén
author_role author
author2 Nieto, Fernando
Albanesi, Guillermo L.
Ortega, Gladys
Monaldi, C. Rubén
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Junta de Andalucía
Asociación Universitaria Iberoamericana de Postgrado (España)
Ministerio de Ciencia e Innovación (España)
Agencia Nacional de Promoción Científica y Tecnológica (Argentina)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Chlorite
Geothermometry
Low-grade metamorphism
Retrodiagenesis
riásico, Subducción, Pre-andino, Cordillera frontal, Geoquímica.
topic Chlorite
Geothermometry
Low-grade metamorphism
Retrodiagenesis
riásico, Subducción, Pre-andino, Cordillera frontal, Geoquímica.
description The thermal post-depositional evolution of metapelitic and metavolcanic rocks of the upper Cambrian Ordovician succession in the Central Andes of northwestern Argentina, was estimated through X ray diffraction of clay mineral analysis, Kübler Index (KI), SEM-EDS study of selected samples and chlorite geothermometry. The study area comprise five representative regions in Puna and Cordillera Oriental, namely at Sierra de Santa Victoria (Nazareno and Santa Victoria river areas), Cordón de los Siete Hermanos (Yavi), Sierra de Rinconada and Sierra de Cochinoca Escaya. The paleotemperatures obtained with the chlorite geothermometer, in coincidence with KI values, show an E-W trend from diagenesis/low anchizone in the eastern flank of Sierra de Santa Victoria, to high anchizone/epizone in the Puna, with intermediate values in the western flank of Sierra de Santa Victoria. This trend, in conjunction with the development of slaty cleavage in the Ordovician rocks from Yavi, Sierra de Cochinoca-Escaya and western localities coincide with the limits proposed for the ¿Ocloyic deformation belt¿. The common occurrence of kaolinite in the slates and the metavolcanic rocks of Sierra de Cochinoca-Escaya, coupled with the substitution of chlorite by interstratified lower-temperature phases in most of these rocks and the occurrence of jarosite in a metadacite, indicate presence of hydrothermal fluids with high H+/cations ratios, producing acid type alteration (Utada, 1980), at temperatures between 100 and ~300 °C. The hydrothermal alteration should have been subsequent to the maximum burial and the attainment of epizonal metamorphism, and was very probably related with the posthumous activity of the Ordovician volcanic arc. The widespread occurrence of retrograde diagenesis products (smectite, kaolinite, as well as interstratified Chl/Sm and Chl/Vrm phases) in the anchizonal/epizonal metapelites of Sierra de Cochinoca-Escaya and Sierra de Rinconada constitute, up to our knowledge, the first report of an extensive hydrothermal activity affecting not only the metavolcanic rocks but also the Lower Ordovician sediments of northern Puna.
publishDate 2017
dc.date.none.fl_str_mv 2017
2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/361944
url http://hdl.handle.net/10261/361944
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MICINN//CGL2011-30153-C02-01
info:eu-repo/grantAgreement/MICINN//CGL2011-30153-C02-02
http://dx.doi.org/10.5027/andgeoV44n2-a04
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Servicio Nacional de Geología y Minería (Chile)
publisher.none.fl_str_mv Servicio Nacional de Geología y Minería (Chile)
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Outlining the thermal posdepositional evolution of the Ordovician successions of northwestern Argentina by clay mineral analysis, chlorite geothermometry and Kübler indexDeterminación de la historia térmica posdepositacional de las sucesiones ordovícicas del noroeste de Argentina mediante análisis de arcillas, geotermometría de la clorita e índice de KüblerDo Campo, MargaritaNieto, FernandoAlbanesi, Guillermo L.Ortega, GladysMonaldi, C. RubénChloriteGeothermometryLow-grade metamorphismRetrodiagenesisriásico, Subducción, Pre-andino, Cordillera frontal, Geoquímica.The thermal post-depositional evolution of metapelitic and metavolcanic rocks of the upper Cambrian Ordovician succession in the Central Andes of northwestern Argentina, was estimated through X ray diffraction of clay mineral analysis, Kübler Index (KI), SEM-EDS study of selected samples and chlorite geothermometry. The study area comprise five representative regions in Puna and Cordillera Oriental, namely at Sierra de Santa Victoria (Nazareno and Santa Victoria river areas), Cordón de los Siete Hermanos (Yavi), Sierra de Rinconada and Sierra de Cochinoca Escaya. The paleotemperatures obtained with the chlorite geothermometer, in coincidence with KI values, show an E-W trend from diagenesis/low anchizone in the eastern flank of Sierra de Santa Victoria, to high anchizone/epizone in the Puna, with intermediate values in the western flank of Sierra de Santa Victoria. This trend, in conjunction with the development of slaty cleavage in the Ordovician rocks from Yavi, Sierra de Cochinoca-Escaya and western localities coincide with the limits proposed for the ¿Ocloyic deformation belt¿. The common occurrence of kaolinite in the slates and the metavolcanic rocks of Sierra de Cochinoca-Escaya, coupled with the substitution of chlorite by interstratified lower-temperature phases in most of these rocks and the occurrence of jarosite in a metadacite, indicate presence of hydrothermal fluids with high H+/cations ratios, producing acid type alteration (Utada, 1980), at temperatures between 100 and ~300 °C. The hydrothermal alteration should have been subsequent to the maximum burial and the attainment of epizonal metamorphism, and was very probably related with the posthumous activity of the Ordovician volcanic arc. The widespread occurrence of retrograde diagenesis products (smectite, kaolinite, as well as interstratified Chl/Sm and Chl/Vrm phases) in the anchizonal/epizonal metapelites of Sierra de Cochinoca-Escaya and Sierra de Rinconada constitute, up to our knowledge, the first report of an extensive hydrothermal activity affecting not only the metavolcanic rocks but also the Lower Ordovician sediments of northern Puna.[ES] Determinación de la historia térmica posdepositacional de las sucesiones ordovícicas del noroeste de Argentina mediante análisis de arcillas, geotermometría de la clorita e índice de Kübler. Estudios por difracción de rayos-X de rocas metapelíticas y metavolcánicas, complementadas con análisis textural a escala del SEM y microanálisis de muestras seleccionadas, con geotermometría de la clorita, han permitido delinear la historia diagenética-metamórfica prograda de las sucesiones del Cámbrico superior-Ordovícico de los Andes Centrales del NW de Argentina e identificar eacciones retrógradas. El estudio se centró en cinco localidades de Puna y Cordillera Oriental: sierra de Santa Victoria (zona de los ríos Nazareno y Santa Victoria), Cordón de los Siete Hermanos (Yavi), sierra de Rinconada y sierra de Cochinoca-Escaya. Las paleotemperaturas obtenidas mediante el geotermómetro de la clorita, coherentes con los valores obtenidos para el índice de Kübler, indican un aumento en las temperaturas de E a W, desde condiciones de diagénesis/ anquizona débil en el flanco oriental de la sierra de Santa Victoria, hasta anquizona fuerte/epizona en la Puna, con valores intermedios en el área de Yavi. Esta tendencia, así como la presencia de un clivaje metamórfico en las rocas ordovícicas de Yavi, sierra de Cochinoca-Escaya y sierra de la Rinconada coincide con los límites propuestos previamente, a partir de estudios estructurales y microtectónicos, para el “Cinturón de deformación Oclóyica”. La presencia de caolinita en la mayor parte de las metapelitas y rocas metavolcánicas de las sierra de Cochinoca-Escaya, junto con la sustitución de la clorita por fases interestratificadas de menor temperatura y la presencia de jarosita en una metadacita, indican alteración por fluidos hidrotermales ácidos, a temperaturas entre 100 y ~300 °C. Esta alteración hidrotermal probablemente estuvo vinculada con la actividad póstuma del arco volcánico Ordovícico y sucedió con posterioridad a la etapa de máximo enterramiento, durante la que las rocas del sector septentrional de la Puna alcanzaron el metamorfismo de grado anquizona fuerte/epizona. La amplia distribución de fases asignables a retrodiagénesis (esmectita, caolinita, así como interstratificados Chl/Sm y Chl/Vrm) en las metapelitas de las sierras de Cochinoca-Escaya y Rinconada constituyen, hasta donde sabemos, el primer registro de una extensa actividad hidrotermal que afectó no solo las rocas metavolcánicas, sino también a los sedimentos del Ordovícico inferior del norte de la PunaThe help of I. Guerra with the SEM (Centro de Instru-mentación Científica, Universidad de Granada, España) was essential for the present work. A. Baleirón prepared the samples for X Ray diffraction, and G. Giordanengo helped with the digital figures. The authors would like to acknowledge the use of the diffractometers from Departamento de Físico-Química, Universidad Nacional de Córdoba, Argentina, and Departamento de Mineralogía y Petrología, Universidad de Granada. The critical reviews and suggestions of the two anonymous reviewers have improved the quality of the paper. This work was financed by ANPCyT - PICT 2008-1797 grant (Argentina), Research Project CGL2011-30153 (Spanish Ministry of Science), and the Research Group RNM-0179 of the Junta de Andalucía, Spain. The stay of M. Do Campo at the Universidad de Granada was supported by and AUIP grant (Programa de Movilidad Académica de Postgrado).Servicio Nacional de Geología y Minería (Chile)Junta de AndalucíaAsociación Universitaria Iberoamericana de Postgrado (España)Ministerio de Ciencia e Innovación (España)Agencia Nacional de Promoción Científica y Tecnológica (Argentina)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420172024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/361944reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICINN//CGL2011-30153-C02-01info:eu-repo/grantAgreement/MICINN//CGL2011-30153-C02-02http://dx.doi.org/10.5027/andgeoV44n2-a04Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3619442026-05-22T06:33:51Z
score 15.81155

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