Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina

Autores
Ross, P. S.; White, J.; Lefebvre, N.; Haller, Miguel Jorge F.
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The underground portion of a maar volcano is called a diatreme, and the transition from diatreme to underlying feeder dike is the root zone. Very few root zones have been documented on outcrop worldwide. Yet this is where at least some of the phreatomagmatic fragmentation happens. Preliminary exploration of the Tertiary Cerro Chivo Volcanic Field, Chubut Province, Argentina, has revealed the presence of several beautifully exposed root zones, adjacent to both diatremes and unfragmented basaltic dikes. We provide an overview of two root zones.Cerro Raiz is an elongate structure exposed over about 100 m by 20 m. It lines up with La Hoyada diatreme further west. A common rock type at Cerro Raiz is well-mixed blocks of muddy to silty sedimentary country rock in a matrix of gravelly sand with sparse juvenile fragments. Locally, large domains of country rocks start to disaggregate and are locally injected by other sediments. These rocks are cut by coherent basalt dikes and pods with marginal peperites.Cerro 117 is a 900 m-long structure which comprises mostly dikes about 1.5 m-thick. Some segments widen to up to 60 m thick and contain rocks partly similar to those at Cerro Raiz. In addition, Cerro 117 includes moderately to vertically dipping, dm-thick beds of tuff, lapilli tuff and tuff breccia which are similar in appearance to the main infill of La Hoyada diatreme. This confirms that Cerro 117 is a true diatreme root zone.
Fil: Ross, P. S.. Institut national de la recherche scientifique. Centre Eau Terre Environnement; Canadá
Fil: White, J.. University Of Otago; Canadá
Fil: Lefebvre, N.. Institute of Geochemistry and Petrology; Suiza
Fil: Haller, Miguel Jorge F.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
27th IUGG General Assembly
Montréal
Canadá
Internatiional Union of Geodesy and Geophysics
Materia
ROOT ZONES
DIATREMES
MONOGENETIC VOLCANISM
PATAGONIA
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:11336/132502
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/132502
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, ArgentinaRoss, P. S.White, J.Lefebvre, N.Haller, Miguel Jorge F.ROOT ZONESDIATREMESMONOGENETIC VOLCANISMPATAGONIAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The underground portion of a maar volcano is called a diatreme, and the transition from diatreme to underlying feeder dike is the root zone. Very few root zones have been documented on outcrop worldwide. Yet this is where at least some of the phreatomagmatic fragmentation happens. Preliminary exploration of the Tertiary Cerro Chivo Volcanic Field, Chubut Province, Argentina, has revealed the presence of several beautifully exposed root zones, adjacent to both diatremes and unfragmented basaltic dikes. We provide an overview of two root zones.Cerro Raiz is an elongate structure exposed over about 100 m by 20 m. It lines up with La Hoyada diatreme further west. A common rock type at Cerro Raiz is well-mixed blocks of muddy to silty sedimentary country rock in a matrix of gravelly sand with sparse juvenile fragments. Locally, large domains of country rocks start to disaggregate and are locally injected by other sediments. These rocks are cut by coherent basalt dikes and pods with marginal peperites.Cerro 117 is a 900 m-long structure which comprises mostly dikes about 1.5 m-thick. Some segments widen to up to 60 m thick and contain rocks partly similar to those at Cerro Raiz. In addition, Cerro 117 includes moderately to vertically dipping, dm-thick beds of tuff, lapilli tuff and tuff breccia which are similar in appearance to the main infill of La Hoyada diatreme. This confirms that Cerro 117 is a true diatreme root zone.Fil: Ross, P. S.. Institut national de la recherche scientifique. Centre Eau Terre Environnement; CanadáFil: White, J.. University Of Otago; CanadáFil: Lefebvre, N.. Institute of Geochemistry and Petrology; SuizaFil: Haller, Miguel Jorge F.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina27th IUGG General AssemblyMontréalCanadáInternatiional Union of Geodesy and GeophysicsInternatiional Union of Geodesy and Geophysics2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectOtroBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/132502Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina; 27th IUGG General Assembly; Montréal; Canadá; 2019; 1-1CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://iugg2019montreal.com/abstract-book.htmlInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:09:48Zoai:ri.conicet.gov.ar:11336/132502instacron: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:34982025-09-10 13:09:48.6CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
title Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
spellingShingle Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
Ross, P. S.
ROOT ZONES
DIATREMES
MONOGENETIC VOLCANISM
PATAGONIA
title_short Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
title_full Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
title_fullStr Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
title_full_unstemmed Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
title_sort Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina
dc.creator.none.fl_str_mv Ross, P. S.
White, J.
Lefebvre, N.
Haller, Miguel Jorge F.
author Ross, P. S.
author_facet Ross, P. S.
White, J.
Lefebvre, N.
Haller, Miguel Jorge F.
author_role author
author2 White, J.
Lefebvre, N.
Haller, Miguel Jorge F.
author2_role author
author
author
dc.subject.none.fl_str_mv ROOT ZONES
DIATREMES
MONOGENETIC VOLCANISM
PATAGONIA
topic ROOT ZONES
DIATREMES
MONOGENETIC VOLCANISM
PATAGONIA
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 underground portion of a maar volcano is called a diatreme, and the transition from diatreme to underlying feeder dike is the root zone. Very few root zones have been documented on outcrop worldwide. Yet this is where at least some of the phreatomagmatic fragmentation happens. Preliminary exploration of the Tertiary Cerro Chivo Volcanic Field, Chubut Province, Argentina, has revealed the presence of several beautifully exposed root zones, adjacent to both diatremes and unfragmented basaltic dikes. We provide an overview of two root zones.Cerro Raiz is an elongate structure exposed over about 100 m by 20 m. It lines up with La Hoyada diatreme further west. A common rock type at Cerro Raiz is well-mixed blocks of muddy to silty sedimentary country rock in a matrix of gravelly sand with sparse juvenile fragments. Locally, large domains of country rocks start to disaggregate and are locally injected by other sediments. These rocks are cut by coherent basalt dikes and pods with marginal peperites.Cerro 117 is a 900 m-long structure which comprises mostly dikes about 1.5 m-thick. Some segments widen to up to 60 m thick and contain rocks partly similar to those at Cerro Raiz. In addition, Cerro 117 includes moderately to vertically dipping, dm-thick beds of tuff, lapilli tuff and tuff breccia which are similar in appearance to the main infill of La Hoyada diatreme. This confirms that Cerro 117 is a true diatreme root zone.
Fil: Ross, P. S.. Institut national de la recherche scientifique. Centre Eau Terre Environnement; Canadá
Fil: White, J.. University Of Otago; Canadá
Fil: Lefebvre, N.. Institute of Geochemistry and Petrology; Suiza
Fil: Haller, Miguel Jorge F.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto Patagónico de Geología y Paleontología; Argentina
27th IUGG General Assembly
Montréal
Canadá
Internatiional Union of Geodesy and Geophysics
description The underground portion of a maar volcano is called a diatreme, and the transition from diatreme to underlying feeder dike is the root zone. Very few root zones have been documented on outcrop worldwide. Yet this is where at least some of the phreatomagmatic fragmentation happens. Preliminary exploration of the Tertiary Cerro Chivo Volcanic Field, Chubut Province, Argentina, has revealed the presence of several beautifully exposed root zones, adjacent to both diatremes and unfragmented basaltic dikes. We provide an overview of two root zones.Cerro Raiz is an elongate structure exposed over about 100 m by 20 m. It lines up with La Hoyada diatreme further west. A common rock type at Cerro Raiz is well-mixed blocks of muddy to silty sedimentary country rock in a matrix of gravelly sand with sparse juvenile fragments. Locally, large domains of country rocks start to disaggregate and are locally injected by other sediments. These rocks are cut by coherent basalt dikes and pods with marginal peperites.Cerro 117 is a 900 m-long structure which comprises mostly dikes about 1.5 m-thick. Some segments widen to up to 60 m thick and contain rocks partly similar to those at Cerro Raiz. In addition, Cerro 117 includes moderately to vertically dipping, dm-thick beds of tuff, lapilli tuff and tuff breccia which are similar in appearance to the main infill of La Hoyada diatreme. This confirms that Cerro 117 is a true diatreme root zone.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Otro
Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/132502
Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina; 27th IUGG General Assembly; Montréal; Canadá; 2019; 1-1
CONICET Digital
CONICET
url http://hdl.handle.net/11336/132502
identifier_str_mv Root Zones and Diatremes in the Cerro Chivo Volcanic Field (CCVF), Chubut Province, Argentina; 27th IUGG General Assembly; Montréal; Canadá; 2019; 1-1
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://iugg2019montreal.com/abstract-book.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Internatiional Union of Geodesy and Geophysics
publisher.none.fl_str_mv Internatiional Union of Geodesy and Geophysics
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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