Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific

The Juan Fernández Ridge (JFR) is an intraplate volcanic chain (~ 800 km) emplaced above the Nazca Plate in the SE Pacific, isolated from the nearby active spreading ridges (East Pacific Rise and Chile Ridge). Through geochemistry (in whole rock and crystals), isotopic data (Sr-Nd-Pb) and geochronol...

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Autor: Reyes Vizcarra, Javier Antonio
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2018
País:Chile
OAI Identifier:oai:repositorio.anid.cl:10533/232865
Acceso en línea:https://hdl.handle.net/10533/232865
Access Level:acceso abierto
Palabra clave:Ciencias Naturales
Ciencias de la Tierra y del Medio Ambiente
Geoquímica y Geofísica
Vulcanología
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dc.title.es_CL.fl_str_mv Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
Petrogénesis y geocronología 40Ar/39Ar del volcanismo intraplaca de la Dorsal de Juan Fernández, Placa de Nazca, Pacífico SE
dc.title.none.fl_str_mv Petrogenesis and 40ar/39ar geochronology of intraplate volcanism from the juan fernández ridge, nazca plate, se pacific
petrogénesis y geocronología 40ar/39ar del volcanismo intraplaca de la dorsal de juan fernández, placa de nazca, pacífico se
title Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
spellingShingle Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
Reyes Vizcarra, Javier Antonio
Ciencias Naturales
Ciencias de la Tierra y del Medio Ambiente
Ciencias de la Tierra y del Medio Ambiente
Geoquímica y Geofísica
Vulcanología
title_short Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
title_full Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
title_fullStr Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
title_full_unstemmed Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
title_sort Petrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE Pacific
dc.creator.none.fl_str_mv Reyes Vizcarra, Javier Antonio
author Reyes Vizcarra, Javier Antonio
author_facet Reyes Vizcarra, Javier Antonio
author_role author
dc.contributor.advisor.none.fl_str_mv Morata Céspedes, Diego
Lara Pulgar, Luis
dc.contributor.institution.es_CL.fl_str_mv UNIVERSIDAD DE CHILE
dc.subject.oecd1n.none.fl_str_mv Ciencias Naturales
topic Ciencias Naturales
Ciencias de la Tierra y del Medio Ambiente
Ciencias de la Tierra y del Medio Ambiente
Geoquímica y Geofísica
Vulcanología
dc.subject.oecd2n.es_CL.fl_str_mv Ciencias de la Tierra y del Medio Ambiente
dc.subject.oecd2n.none.fl_str_mv Ciencias de la Tierra y del Medio Ambiente
dc.subject.oecd3n.none.fl_str_mv Geoquímica y Geofísica
Vulcanología
description The Juan Fernández Ridge (JFR) is an intraplate volcanic chain (~ 800 km) emplaced above the Nazca Plate in the SE Pacific, isolated from the nearby active spreading ridges (East Pacific Rise and Chile Ridge). Through geochemistry (in whole rock and crystals), isotopic data (Sr-Nd-Pb) and geochronology (40Ar/39Ar) the aim is to understand the petrogenetic processes involved in the generation of volcanism and magmatic evolution of JFR. The four most volumetric volcanic structures of JFR: O'Higgins (~ 9.26 - 8.41 Ma), Alpha (~ 4.63 - 4.58 Ma), Robinson Crusoe (~ 4.10 - 3.40 Ma) and Alejandro Selkirk (~ 0.94 - 0.83 Ma); satisfy a younger E to W age progression consistent with the theory of mantle plumes. The shield-building stage represents almost the total volume of the studied volcanoes, and is composed mainly of basalts with geochemical (e.g., high TiO2 content, high FC3MS and TITAN anomaly) and isotopic signature (FOZO-A with additional DM contribution) that suggest the presence of pyroxenite (formed from recycled oceanic crust) as heterogeneity in the mantle source (mainly peridotites). Pyroxenites in the source are confirmed by a petrogenetic model for the JFR plume that indicates a low potential temperature (range of 1290 - 1322 ° C for Robinson Crusoe vs. 1312 - 1362 ° C in Alejandro Selkirk), pressure of melting termination (2.34 - 2.54 vs. 2.24 - 2.52 GPa) probably related to the lithosphere-asthenosphere boundary, and a similar participation in the final magma of melts originated from pyroxenites (38.6 - 56.4 vs. 35.8 - 55.6 wt%), despite its low presence (weight fraction) in the mantle source (4 - 8 vs. 6 - 12 wt%). The internal compositional variations are explained in terms of fractional crystallization of olivine + clinopyroxene ± plagioclase, mixing and/or magmatic recharge and accumulation of olivine phenocrysts in a shallow magmatic chamber (~ 1 to 3 kbar) where the temperature of the magmas can decrease to 1156 - 1181 ° C. The chemical differences between volcanoes are explained by subtle temporary variations in the potential temperature and degree of partial melting of the mantle plume. O'Higgins and Robinson Crusoe also show a stage of rejuvenated volcanism formed by basanite lava flows erupted after a maximum period of inactivity of ~ 0.25 Ma in O'Higgins, and ~ 1.73 Ma in Robinson Crusoe. Its marked geochemical enrichment and isotopic signature relatively similar to the shield-building stage confirm that it also originates from a mantle plume, but possibly with subtle variations in the proportion of its constituents (peridotite and pyroxenite), temperature and degree of partial melting (both less than the shield-building stage). These magmas rise directly from mantle (> 1300 ° C), capturing xenocrystals, with polybaric crystallization and few differentiation. Some melts are stored for brief periods in small shallow reservoirs (at temperatures ~ 1256 - 1295 ° C).
publishDate 2018
dc.date.issued.es_CL.fl_str_mv 2018
dc.date.accessioned.none.fl_str_mv 2019-01-04T17:32:36Z
2022-08-23T03:10:00Z
dc.date.available.none.fl_str_mv 2019-01-04T17:32:36Z
2022-08-23T03:10:00Z
dc.type.none.fl_str_mv Tesis Doctorado
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dc.type.openaire.none.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.tesis.none.fl_str_mv Tesis
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identifier_str_mv 21120781
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spelling UNIVERSIDAD DE CHILEReyes Vizcarra, Javier Antonio2018https://hdl.handle.net/10533/232865http://purl.org/coar/access_right/c_abf2Geoquímica y GeofísicaCiencias de la Tierra y del Medio AmbienteCiencias NaturalesPetrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE PacificMorata Céspedes, DiegoLara Pulgar, LuisUNIVERSIDAD DE CHILEChileReyes Vizcarra, Javier Antonio2019-01-04T17:32:36Z2022-08-23T03:10:00Z2019-01-04T17:32:36Z2022-08-23T03:10:00Z2018The Juan Fernández Ridge (JFR) is an intraplate volcanic chain (~ 800 km) emplaced above the Nazca Plate in the SE Pacific, isolated from the nearby active spreading ridges (East Pacific Rise and Chile Ridge). Through geochemistry (in whole rock and crystals), isotopic data (Sr-Nd-Pb) and geochronology (40Ar/39Ar) the aim is to understand the petrogenetic processes involved in the generation of volcanism and magmatic evolution of JFR. The four most volumetric volcanic structures of JFR: O'Higgins (~ 9.26 - 8.41 Ma), Alpha (~ 4.63 - 4.58 Ma), Robinson Crusoe (~ 4.10 - 3.40 Ma) and Alejandro Selkirk (~ 0.94 - 0.83 Ma); satisfy a younger E to W age progression consistent with the theory of mantle plumes. The shield-building stage represents almost the total volume of the studied volcanoes, and is composed mainly of basalts with geochemical (e.g., high TiO2 content, high FC3MS and TITAN anomaly) and isotopic signature (FOZO-A with additional DM contribution) that suggest the presence of pyroxenite (formed from recycled oceanic crust) as heterogeneity in the mantle source (mainly peridotites). Pyroxenites in the source are confirmed by a petrogenetic model for the JFR plume that indicates a low potential temperature (range of 1290 - 1322 ° C for Robinson Crusoe vs. 1312 - 1362 ° C in Alejandro Selkirk), pressure of melting termination (2.34 - 2.54 vs. 2.24 - 2.52 GPa) probably related to the lithosphere-asthenosphere boundary, and a similar participation in the final magma of melts originated from pyroxenites (38.6 - 56.4 vs. 35.8 - 55.6 wt%), despite its low presence (weight fraction) in the mantle source (4 - 8 vs. 6 - 12 wt%). The internal compositional variations are explained in terms of fractional crystallization of olivine + clinopyroxene ± plagioclase, mixing and/or magmatic recharge and accumulation of olivine phenocrysts in a shallow magmatic chamber (~ 1 to 3 kbar) where the temperature of the magmas can decrease to 1156 - 1181 ° C. The chemical differences between volcanoes are explained by subtle temporary variations in the potential temperature and degree of partial melting of the mantle plume. O'Higgins and Robinson Crusoe also show a stage of rejuvenated volcanism formed by basanite lava flows erupted after a maximum period of inactivity of ~ 0.25 Ma in O'Higgins, and ~ 1.73 Ma in Robinson Crusoe. Its marked geochemical enrichment and isotopic signature relatively similar to the shield-building stage confirm that it also originates from a mantle plume, but possibly with subtle variations in the proportion of its constituents (peridotite and pyroxenite), temperature and degree of partial melting (both less than the shield-building stage). These magmas rise directly from mantle (> 1300 ° C), capturing xenocrystals, with polybaric crystallization and few differentiation. Some melts are stored for brief periods in small shallow reservoirs (at temperatures ~ 1256 - 1295 ° C).La Dorsal de Juan Fernández (JFR) es una cadena volcánica (~ 800 km) de intraplaca emplazada sobre la Placa de Nazca en el Pacífico SE alejada de márgenes activos. Mediante datos de geoquímica (roca total y mineral), isotópicos (Sr-Nd-Pb) y geocronológicos (40Ar/39Ar) se busca comprender los procesos petrogenéticos implicados en la generación del volcanismo y en la evolución magmática de JFR. Se determina que los 4 edificios volcánicos más volumétricos de JFR: O’Higgins (~ 9.26 – 8.41 Ma), Alpha (~ 4.63 – 4.58 Ma), Robinson Crusoe (~ 4.10 – 3.40 Ma) y Alejandro Selkirk (~ 0.94 – 0.83 Ma); satisfacen una progresión de edades más joven hacia el W coherente con la teoría de plumas mantélicas. La fase de construcción del escudo representa casi la totalidad del volumen de los edificios estudiados, se compone principalmente de basaltos con signatura geoquímica (e.g., alto contenido de TiO2, alto FC3MS y anomalía TITAN) e isotópica (FOZO-A con participación adicional de DM) que sugiere la presencia de piroxenita (formada a partir de corteza oceánica reciclada) como heterogeneidad en una fuente mantélica peridotítica. Dicha presencia es confirmada mediante un modelo petrogénetico para la pluma que indica una baja temperatura potencial (rango de 1290 – 1322 °C para Robinson Crusoe vs. 1312 – 1362 °C en Alejandro Selkirk), presión de término de fusión (2.34 – 2.54 vs. 2.24 – 2.52 GPa) probablemente relacionado al límite litósfera-astenosfera, y una similar participación en el melt final de fundidos provenientes de piroxenita (38.6 – 56.4 vs. 35.8 – 55.6 wt%) pese a su baja presencia en la pluma (4 – 8 vs. 6 – 12 wt%). Las variaciones composicionales internas se explican por fraccionamiento de olivino + clinopiroxeno ± plagioclasa, mezcla y/o recarga magmática y acumulación de cristales de olivino en una cámara magmática somera (~ 1 a 3 kbar) donde la temperatura de los magmas puede descender hasta 1156 – 1181 °C, y las variaciones entre volcanes se explica por variaciones temporales en la temperatura potencial y tasa de fusión parcial de la pluma mantélica. O’Higgins y Robinson Crusoe también muestran una fase de volcanismo rejuvenecido formada por coladas de lava basanítica eruptadas tras un periodo de inactividad máximo de ~ 0.25 Ma en O’Higgins, y ~ 1.73 Ma en Robinson Crusoe. Su mayor enriquecimiento geoquímico y signatura isotópica relativamente similar al escudo confirman que también se origina a partir de una pluma mantélica, pero posiblemente con sutiles variaciones en la proporción de sus constituyentes (peridotita y piroxenita), temperatura y grado de fusión parcial (ambas menores a la etapa de escudo). Estos magmas ascienden de manera directa (> 1300 °C), capturando xenocristales, con cristalización polibárica y poca diferenciación, ya que solo algunas son almacenadas por breves periodos en pequeños reservorios someros (a ~ 1256 – 1295 °C).PFCHA-BecasPFCHA-Becas21120781https://hdl.handle.net/10533/232865instname: Conicytreponame: Repositorio Digital RI2.0info:eu-repo/grantAgreement//21120781info:eu-repo/semantics/dataset/hdl.handle.net/10533/93488info:eu-repo/semantics/openAccessAttribution-NoDerivs 3.0 Chilehttp://creativecommons.org/licenses/by-nd/3.0/cl/Ciencias NaturalesCiencias de la Tierra y del Medio AmbienteCiencias de la Tierra y del Medio AmbienteGeoquímica y GeofísicaVulcanologíaPetrogenesis and 40Ar/39Ar geochronology of intraplate volcanism from the Juan Fernández Ridge, Nazca Plate, SE PacificPetrogénesis y geocronología 40Ar/39Ar del volcanismo intraplaca de la Dorsal de Juan Fernández, Placa de Nazca, Pacífico SEPetrogenesis and 40ar/39ar geochronology of intraplate volcanism from the juan fernández ridge, nazca plate, se pacificpetrogénesis y geocronología 40ar/39ar del volcanismo intraplaca de la dorsal de juan fernández, placa de nazca, pacífico seTesis Doctoradoinfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersionTesisTesishttps://hdl.handle.net/10533/232865PFCHA-Becas606208e9-7f88-46ea-8301-7c611e1ef81fvirtual::63477-1606208e9-7f88-46ea-8301-7c611e1ef81fvirtual::63477-1CC-LICENSElicense_rdfapplication/octet-stream1223https://repositorio.anid.cl/bitstreams/3c9b34ab-b179-421c-a99d-3958ee65dd49/downloade924f67ab89699e49759d603359f23fdMD51LICENSElicense.txttext/plain1779https://repositorio.anid.cl/bitstreams/811379ae-5623-4db3-84c8-f12cc8fafa75/download593a6e7305c66c56041a9f9e15a649c1MD52ORIGINALTesis_JReyes.pdfapplication/pdf33924981https://repositorio.anid.cl/bitstreams/4b6cf124-da5d-419d-b5d7-85a55b7b2e3f/download63196993eeadea40c7cf269c1a3b2791MD53TEXTTesis_JReyes.pdf.txtExtracted texttext/plain381630https://repositorio.anid.cl/bitstreams/7474bc97-cb48-4e52-a6bc-55fc8bb8bdac/download6e18a2040a42d67af7996559032c435dMD54THUMBNAILTesis_JReyes.pdf.jpgIM Thumbnailimage/jpeg2425https://repositorio.anid.cl/bitstreams/368b5c61-f3e5-4ec1-8ef4-cbed0ae65277/download8cea967433229965d5e3211d13d28289MD5510533/232865oai:repositorio.anid.cl:10533/2328652023-07-24 16:33:21.276http://creativecommons.org/licenses/by-nd/3.0/cl/info:eu-repo/semantics/openAccesshttps://repositorio.anid.clRepositorio ANIDaletelier@anid.clTGljZW5jaWEgZGUgRGlzdHJpYnVjacOzbiBObyBFeGNsdXNpdmEKCkFsIGZpcm1hciB5IHByZXNlbnRhciBlc3RhIGxpY2VuY2lhICwgdXN0ZWQgKGVsIGF1dG9yKGVzKSBvIHRpdHVsYXIgZGUgZGVyZWNob3MgZGUgYXV0b3IpIGdhcmFudGl6YSBhIGxhIENvbWlzacOzbiBOYWNpb25hbCBkZSBJbnZlc3RpZ2FjacOzbiBDaWVudMOtdGljYSB5IFRlY25vbMOzZ2ljYSAoQ09OSUNZVCkgZWwgZGVyZWNobyBubyBleGNsdXNpdm8gZGUgcmVwcm9kdWNpciAsIHRyYWR1Y2lyIChjb21vIHNlIGRlZmluZSBtw6FzIGFiYWpvKSAsIHkvbyBkaXN0cmlidWlyIHN1IGRvY3VtZW50byAoaW5jbHV5ZW5kbyBlbCByZXN1bWVuKSBlbiB0b2RvIGVsIG11bmRvIGVuIGZvcm1hIGltcHJlc2EgeSBlbiBmb3JtYXRvIGVsZWN0csOzbmljbyB5IGVuIGN1YWxxdWllciBtZWRpbywgaW5jbHV5ZW5kbywgcGVybyBubyBsaW1pdGFkbyBhLCBhdWRpbyBvIHbDrWRlby4KClVzdGVkIGFjZXB0YSBxdWUgQ09OSUNZVCBwdWVkZSwgc2luIGFsdGVyYXIgc3UgY29udGVuaWRvLCBjb252ZXJ0aXJsbyBhIGN1YWxxdWllciBtZWRpbyBvIGZvcm1hdG8gcGFyYSBlbCBmaW4gZGUgbGEgY29uc2VydmFjacOzbi4KClRhbWJpw6luIGFjZXB0YSBxdWUgQ09OSUNZVCBwdWVkZSB0ZW5lciBtw6FzIGRlIHVuYSBjb3BpYSBkZSBlc3RlIGRvY3VtZW50byBwYXJhIGZpbmVzIGRlIHNlZ3VyaWRhZCwgY29waWFzIGRlIHNlZ3VyaWRhZCB5IGNvbnNlcnZhY2nDs24uCgpVc3RlZCBkZWNsYXJhIHF1ZSBlbCBkb2N1bWVudG8gZXMgdW4gdHJhYmFqbyBvcmlnaW5hbCwgeSBxdWUgdXN0ZWQgdGllbmUgZWwgZGVyZWNobyBkZSBvdG9yZ2FyIGxvcyBkZXJlY2hvcyBjb250ZW5pZG9zIGVuIGVzdGEgbGljZW5jaWEuIFRhbWJpw6luIGRlY2xhcmEgcXVlIHN1IHBldGljacOzbiBubywgYSBsbyBtZWpvciBkZSBzdSBjb25vY2ltaWVudG8sIGluZnJpbmdlIGxvcyBkZXJlY2hvcyBkZSBhdXRvciBkZSBuYWRpZS4KClNpIGVsIGRvY3VtZW50byBjb250aWVuZSBtYXRlcmlhbGVzIGRlIGxvcyBxdWUgbm8gdGllbmVuIGRlcmVjaG9zIGRlIGF1dG9yICwgdXN0ZWQgZGVjbGFyYSBxdWUgaGEgb2J0ZW5pZG8gZWwgcGVybWlzbyBzaW4gcmVzdHJpY2Npw7NuIGRlbCBwcm9waWV0YXJpbyBkZSBsb3MgZGVyZWNob3MgcmVxdWVyaWRvcyBwb3IgZXN0YSBsaWNlbmNpYSB5IHF1ZSBlc2UgbWF0ZXJpYWwgY3V5b3MgZGVyZWNob3Mgc29uIGRlIHRlcmNlcm9zIGVzdMOhIGNsYXJhbWVudGUgaWRlbnRpZmljYWRvIHkgcmVjb25vY2lkbyBlbiBlbCB0ZXh0byBvIGNvbnRlbmlkbyBkZWwgZG9jdW1lbnRvIGVudHJlZ2Fkby4KClNJIEVMIEVOVsONTyBTRSBCQVNBIEVOIEVMIFRSQUJBSk8gUVVFIEhBIFNJRE8gUEFUUk9OQURPIE8gQVBPWUFETyBQT1IgQUxHVU5BIElOU1RJVFVDScOTTiBRVUUgTk8gU0VBIENPTklDWVQsIFVTVEVEIEFDRVBUQSBRVUUgSEEgQ1VNUExJRE8gQSBDVUFMUVVJRVIgREVSRUNITyBERSBSRVZJU0nDk04gVSBPVFJBUyBPQkxJR0FDSU9ORVMgUkVRVUVSSURBUyBQT1IgRElDSE8gQ09OVFJBVE8gTyBBQ1VFUkRPLgoKQ09OSUNZVCBpZGVudGlmaWNhcsOhIGNsYXJhbWVudGUgc3Ugbm9tYnJlKGVzKSBjb21vIGVsIGF1dG9yKGVzKSBvIHByb3BpZXRhcmlvKHMpIGRlIGxhIHByZXNlbnRhY2nDs24gLCB5IG5vIGhhcsOhIG5pbmd1bmEgYWx0ZXJhY2nDs24sIGV4Y2VwdG8gc2Vnw7puIGxvIHBlcm1pdGlkbyBwb3IgbGEgbGljZW5jaWEsIHBhcmEgc3UgcHJlc2VudGFjacOzbi4K
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