Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina

Autores
Remesal, M.; Cerredo, M.E.; Albite, J.M; Salani, F.M.; Parica, Claudio Alberto
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Miocene Alta Sierra de Somún Curá Volcanic Complex (ASSCVC) is the northernmost post-plateau complex of the Somún Curá Magmatic Province (SCMP), at the northern extrandean Patagonia, Argentina (Fig. 1a, b). ASSCVC is made of several volcanic buildings which span the basaltic to trachyte realm. Monogenetic basaltic volcanoes (i.e. Cuatro Cerros), trachyte apparatus (i.e. Cerro Pancho) and polygenetic basaltic to trachyte constructions (i.e. Cerro Corona) compose the Complex. Four features distinguish ASSCVC from other post-plateau complexes of the SCMP: its age, it is the youngest of the post-plateau assemblages; the lack of a compositional gap between basaltic and trachyte terms; the absence of rhyolite differentiates and the presence of several emission centers associated with prominent volcanic constructions. This contribution deals with one of the chiefly trachyte volcanoes of ASSCVC. The polygenetic stratovolcano of Cerro Mimbre (CMTV), located in the southern complex (Fig. 1c), is the northernmost of three volcanoes arranged along a NW-SE trend. CMTV is set within a local low relief area dominated by volcanic landforms with general SE gentle slope. Two semicircular escarpments in the uppermost CMTV are compatible with an explosion crater. Associated loose deposits of white color and fine texture, located among coulées, are indicative of explosive eruptive facies. At least four lobular trachytic coulées emerge from the domes distributed in the CMTV; coulées locally preserve marginal ridges. Trachyte coulées include autobrecciated facies of porphyric texture with anorthoclase phenocrysts and minor ferromagnesian minerals. Groundmass is trachytic composed of sanidine microliths and clinopyroxene.Trachyte lava flows are porphyric with feldspar phenocrysts (of oligoclase to anorthoclase composition) set in a trachyte groundmass with some bostonitic patches. Microliths of anorthoclase to sanidine composition, olivine, clinopyroxene (Mg-rich augite), F-apatite and magnetite complete the groundmass assemblage.Two long basaltic flows extend for several kilometers enveloping the CMTV. Three scoria cones surround the CMTV; within the main crater, there are two oxidized deposits of scoria that would correspond to a very eroded cone, younger than the trachyte coulées. The lowermost basaltic flows surrounding the main volcanic building are vesicle rich, either aphyric or porphyritic with plagioclase phenocrysts and olivine microphenocrysts set in an intergranular groundmass with ophitic patches made of clinopyroxene and plagioclase.Trachyte flows of the CMTV yielded a new whole rock K/Ar age (Fig. 1d) of 9.8 ± 0.3 Ma, which fits well (within errors) with already published chronological data for other trachyte lavas of ASSCVC ( 9-13 Ma).
Fil: Remesal, M.. Universidad de Buenos Aires; Argentina
Fil: Cerredo, M.E.. Universidad de Buenos Aires; Argentina
Fil: Albite, J.M. Universidad de Buenos Aires; Argentina
Fil: Salani, F.M.. Universidad de Buenos Aires; Argentina
Fil: Parica, Claudio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
25th Latin American Colloquium of Geosciences
Hamburg
Alemania
Universität Hamburg
Materia
VOLCANISM
EXTRA ANDEAN PATAGONIA
ARGENTINA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/154714

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network_name_str CONICET Digital (CONICET)
spelling Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. ArgentinaRemesal, M.Cerredo, M.E.Albite, J.MSalani, F.M.Parica, Claudio AlbertoVOLCANISMEXTRA ANDEAN PATAGONIAARGENTINAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Miocene Alta Sierra de Somún Curá Volcanic Complex (ASSCVC) is the northernmost post-plateau complex of the Somún Curá Magmatic Province (SCMP), at the northern extrandean Patagonia, Argentina (Fig. 1a, b). ASSCVC is made of several volcanic buildings which span the basaltic to trachyte realm. Monogenetic basaltic volcanoes (i.e. Cuatro Cerros), trachyte apparatus (i.e. Cerro Pancho) and polygenetic basaltic to trachyte constructions (i.e. Cerro Corona) compose the Complex. Four features distinguish ASSCVC from other post-plateau complexes of the SCMP: its age, it is the youngest of the post-plateau assemblages; the lack of a compositional gap between basaltic and trachyte terms; the absence of rhyolite differentiates and the presence of several emission centers associated with prominent volcanic constructions. This contribution deals with one of the chiefly trachyte volcanoes of ASSCVC. The polygenetic stratovolcano of Cerro Mimbre (CMTV), located in the southern complex (Fig. 1c), is the northernmost of three volcanoes arranged along a NW-SE trend. CMTV is set within a local low relief area dominated by volcanic landforms with general SE gentle slope. Two semicircular escarpments in the uppermost CMTV are compatible with an explosion crater. Associated loose deposits of white color and fine texture, located among coulées, are indicative of explosive eruptive facies. At least four lobular trachytic coulées emerge from the domes distributed in the CMTV; coulées locally preserve marginal ridges. Trachyte coulées include autobrecciated facies of porphyric texture with anorthoclase phenocrysts and minor ferromagnesian minerals. Groundmass is trachytic composed of sanidine microliths and clinopyroxene.Trachyte lava flows are porphyric with feldspar phenocrysts (of oligoclase to anorthoclase composition) set in a trachyte groundmass with some bostonitic patches. Microliths of anorthoclase to sanidine composition, olivine, clinopyroxene (Mg-rich augite), F-apatite and magnetite complete the groundmass assemblage.Two long basaltic flows extend for several kilometers enveloping the CMTV. Three scoria cones surround the CMTV; within the main crater, there are two oxidized deposits of scoria that would correspond to a very eroded cone, younger than the trachyte coulées. The lowermost basaltic flows surrounding the main volcanic building are vesicle rich, either aphyric or porphyritic with plagioclase phenocrysts and olivine microphenocrysts set in an intergranular groundmass with ophitic patches made of clinopyroxene and plagioclase.Trachyte flows of the CMTV yielded a new whole rock K/Ar age (Fig. 1d) of 9.8 ± 0.3 Ma, which fits well (within errors) with already published chronological data for other trachyte lavas of ASSCVC ( 9-13 Ma).Fil: Remesal, M.. Universidad de Buenos Aires; ArgentinaFil: Cerredo, M.E.. Universidad de Buenos Aires; ArgentinaFil: Albite, J.M. Universidad de Buenos Aires; ArgentinaFil: Salani, F.M.. Universidad de Buenos Aires; ArgentinaFil: Parica, Claudio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina25th Latin American Colloquium of GeosciencesHamburgAlemaniaUniversität HamburgUniversität Hamburg2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/154714Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina; 25th Latin American Colloquium of Geosciences; Hamburg; Alemania; 2019; 1-20946-8978CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://e-docs.geo-leo.de/handle/11858/7935?locale-attribute=enInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:43:53Zoai:ri.conicet.gov.ar:11336/154714instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:43:54.158CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
title Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
spellingShingle Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
Remesal, M.
VOLCANISM
EXTRA ANDEAN PATAGONIA
ARGENTINA
title_short Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
title_full Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
title_fullStr Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
title_full_unstemmed Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
title_sort Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina
dc.creator.none.fl_str_mv Remesal, M.
Cerredo, M.E.
Albite, J.M
Salani, F.M.
Parica, Claudio Alberto
author Remesal, M.
author_facet Remesal, M.
Cerredo, M.E.
Albite, J.M
Salani, F.M.
Parica, Claudio Alberto
author_role author
author2 Cerredo, M.E.
Albite, J.M
Salani, F.M.
Parica, Claudio Alberto
author2_role author
author
author
author
dc.subject.none.fl_str_mv VOLCANISM
EXTRA ANDEAN PATAGONIA
ARGENTINA
topic VOLCANISM
EXTRA ANDEAN PATAGONIA
ARGENTINA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Miocene Alta Sierra de Somún Curá Volcanic Complex (ASSCVC) is the northernmost post-plateau complex of the Somún Curá Magmatic Province (SCMP), at the northern extrandean Patagonia, Argentina (Fig. 1a, b). ASSCVC is made of several volcanic buildings which span the basaltic to trachyte realm. Monogenetic basaltic volcanoes (i.e. Cuatro Cerros), trachyte apparatus (i.e. Cerro Pancho) and polygenetic basaltic to trachyte constructions (i.e. Cerro Corona) compose the Complex. Four features distinguish ASSCVC from other post-plateau complexes of the SCMP: its age, it is the youngest of the post-plateau assemblages; the lack of a compositional gap between basaltic and trachyte terms; the absence of rhyolite differentiates and the presence of several emission centers associated with prominent volcanic constructions. This contribution deals with one of the chiefly trachyte volcanoes of ASSCVC. The polygenetic stratovolcano of Cerro Mimbre (CMTV), located in the southern complex (Fig. 1c), is the northernmost of three volcanoes arranged along a NW-SE trend. CMTV is set within a local low relief area dominated by volcanic landforms with general SE gentle slope. Two semicircular escarpments in the uppermost CMTV are compatible with an explosion crater. Associated loose deposits of white color and fine texture, located among coulées, are indicative of explosive eruptive facies. At least four lobular trachytic coulées emerge from the domes distributed in the CMTV; coulées locally preserve marginal ridges. Trachyte coulées include autobrecciated facies of porphyric texture with anorthoclase phenocrysts and minor ferromagnesian minerals. Groundmass is trachytic composed of sanidine microliths and clinopyroxene.Trachyte lava flows are porphyric with feldspar phenocrysts (of oligoclase to anorthoclase composition) set in a trachyte groundmass with some bostonitic patches. Microliths of anorthoclase to sanidine composition, olivine, clinopyroxene (Mg-rich augite), F-apatite and magnetite complete the groundmass assemblage.Two long basaltic flows extend for several kilometers enveloping the CMTV. Three scoria cones surround the CMTV; within the main crater, there are two oxidized deposits of scoria that would correspond to a very eroded cone, younger than the trachyte coulées. The lowermost basaltic flows surrounding the main volcanic building are vesicle rich, either aphyric or porphyritic with plagioclase phenocrysts and olivine microphenocrysts set in an intergranular groundmass with ophitic patches made of clinopyroxene and plagioclase.Trachyte flows of the CMTV yielded a new whole rock K/Ar age (Fig. 1d) of 9.8 ± 0.3 Ma, which fits well (within errors) with already published chronological data for other trachyte lavas of ASSCVC ( 9-13 Ma).
Fil: Remesal, M.. Universidad de Buenos Aires; Argentina
Fil: Cerredo, M.E.. Universidad de Buenos Aires; Argentina
Fil: Albite, J.M. Universidad de Buenos Aires; Argentina
Fil: Salani, F.M.. Universidad de Buenos Aires; Argentina
Fil: Parica, Claudio Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Investigación y Desarrollo Estratégico para la Defensa. Ministerio de Defensa. Unidad de Investigación y Desarrollo Estratégico para la Defensa; Argentina
25th Latin American Colloquium of Geosciences
Hamburg
Alemania
Universität Hamburg
description The Miocene Alta Sierra de Somún Curá Volcanic Complex (ASSCVC) is the northernmost post-plateau complex of the Somún Curá Magmatic Province (SCMP), at the northern extrandean Patagonia, Argentina (Fig. 1a, b). ASSCVC is made of several volcanic buildings which span the basaltic to trachyte realm. Monogenetic basaltic volcanoes (i.e. Cuatro Cerros), trachyte apparatus (i.e. Cerro Pancho) and polygenetic basaltic to trachyte constructions (i.e. Cerro Corona) compose the Complex. Four features distinguish ASSCVC from other post-plateau complexes of the SCMP: its age, it is the youngest of the post-plateau assemblages; the lack of a compositional gap between basaltic and trachyte terms; the absence of rhyolite differentiates and the presence of several emission centers associated with prominent volcanic constructions. This contribution deals with one of the chiefly trachyte volcanoes of ASSCVC. The polygenetic stratovolcano of Cerro Mimbre (CMTV), located in the southern complex (Fig. 1c), is the northernmost of three volcanoes arranged along a NW-SE trend. CMTV is set within a local low relief area dominated by volcanic landforms with general SE gentle slope. Two semicircular escarpments in the uppermost CMTV are compatible with an explosion crater. Associated loose deposits of white color and fine texture, located among coulées, are indicative of explosive eruptive facies. At least four lobular trachytic coulées emerge from the domes distributed in the CMTV; coulées locally preserve marginal ridges. Trachyte coulées include autobrecciated facies of porphyric texture with anorthoclase phenocrysts and minor ferromagnesian minerals. Groundmass is trachytic composed of sanidine microliths and clinopyroxene.Trachyte lava flows are porphyric with feldspar phenocrysts (of oligoclase to anorthoclase composition) set in a trachyte groundmass with some bostonitic patches. Microliths of anorthoclase to sanidine composition, olivine, clinopyroxene (Mg-rich augite), F-apatite and magnetite complete the groundmass assemblage.Two long basaltic flows extend for several kilometers enveloping the CMTV. Three scoria cones surround the CMTV; within the main crater, there are two oxidized deposits of scoria that would correspond to a very eroded cone, younger than the trachyte coulées. The lowermost basaltic flows surrounding the main volcanic building are vesicle rich, either aphyric or porphyritic with plagioclase phenocrysts and olivine microphenocrysts set in an intergranular groundmass with ophitic patches made of clinopyroxene and plagioclase.Trachyte flows of the CMTV yielded a new whole rock K/Ar age (Fig. 1d) of 9.8 ± 0.3 Ma, which fits well (within errors) with already published chronological data for other trachyte lavas of ASSCVC ( 9-13 Ma).
publishDate 2019
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Journal
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dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/154714
Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina; 25th Latin American Colloquium of Geosciences; Hamburg; Alemania; 2019; 1-2
0946-8978
CONICET Digital
CONICET
url http://hdl.handle.net/11336/154714
identifier_str_mv Tortonian trachyte volcanoe in the Alta Sierra de Somún Curá Volcanic Complex: Northern Extrandean Patagonia. Argentina; 25th Latin American Colloquium of Geosciences; Hamburg; Alemania; 2019; 1-2
0946-8978
CONICET Digital
CONICET
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