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dc.contributor.author
Sruoga, Patricia
dc.contributor.author
Yamin, Marcela Gladys
dc.contributor.author
Corvalán, Marina
dc.contributor.author
Kaufman, Johanna
dc.contributor.author
Elissondo, Manuela
dc.contributor.author
Olivera Craig, Victoria
dc.contributor.author
Badi, Gabriela Badi
dc.contributor.author
García, Sebastian
dc.date.available
2022-08-22T19:51:12Z
dc.date.issued
2021-10
dc.identifier.citation
Sruoga, Patricia; Yamin, Marcela Gladys; Corvalán, Marina; Kaufman, Johanna; Elissondo, Manuela; et al.; Late Pleistocene subglacial fissure-related volcanism at Caviahue-Copahue Volcanic Complex (37° 51° S, 71° 05’ W), South Volcanic Zone; Elsevier; Journal of South American Earth Sciences; 110; 10-2021; 1-16
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/166285
dc.description.abstract
The Caviahue-Copahue Volcanic Complex (CCVC, 37° 51’ S-71° 05′ W) is located in the central segment of the South Volcanic Zone, ~30 km eastward from the main Andean volcanic arc. Within a complex tectonic setting, it has developed under the influence of the northern transtensional Liquiñe-Ofqui Fault Zone, to the south and the Copahue-Antiñir Fault Zone to the northeast. The onset of volcanic activity within Caviahue volcano-tectonic depression has been dated at Ar/Ar 125 ± 9 ka and it is represented by lava flows and ignimbrites of Las Mellizas Formation. Copahue volcano has a very well documented historical eruptive record, encompassing 13 eruptive cycles in the last 260 years. On the contrary, volcano stratigraphy during Late Pleistocene and pre-historic times is poorly constrained, mainly due to the lack of reliable radiometric data. Based on the peculiar morphology and cooling-fracture systems, lavas that crop out along Dulce, Jara and NE Agrio river valleys have been included in a new stratigraphic unit, here named as Río Dulce Formation. A subglacial emplacement is proposed taking into account the evidence of ice-confinement, provided by the flat-topped and steep-sided lava domes/flows and dammed lava flows. In addition, melt water-magma interaction is supported by conspicuous fine columnar-jointing and closely spaced curved bands with plumose structures, well-developed pseudopillow fracture systems, platy and hackly fractures and cube-jointed entablature-bearing lava flows. The basaltic andesites (SiO2= 55–57%) are porphyritic, with ~30–40% of sieved plagioclase, two pyroxenes and olivine, set in a glassy groundmass. Lava vent distribution and primary anisotropy planes orientation, in coincidence with WNW-ESE and NE-SW trending faults, lineaments and fault scarps, document a first-order structural control on the volcanic emplacement. Although undated, this study can contribute to understanding the timing of glacial fluctuations during Late Pleistocene. Furthermore, it has implications on hazard assessment since it highlights that the evolution of the CCVC has experienced alternating fissure and central eruptive style, likely related to the dynamics of the magma-plumbing system, as suggested by geophysical evidence of unrest.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BASALTIC ANDESITES
dc.subject
CAVIAHUE-COPAHUE VOLCANIC COMPLEX
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FISSURES
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SUBGLACIAL LAVAS
dc.subject.classification
Vulcanología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Late Pleistocene subglacial fissure-related volcanism at Caviahue-Copahue Volcanic Complex (37° 51° S, 71° 05’ W), South Volcanic Zone
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-08-19T15:34:56Z
dc.journal.volume
110
dc.journal.pagination
1-16
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Sruoga, Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Yamin, Marcela Gladys. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Corvalán, Marina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Kaufman, Johanna. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Elissondo, Manuela. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Olivera Craig, Victoria. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.description.fil
Fil: Badi, Gabriela Badi. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Universidad Nacional de la Plata. Facultad de Cs.astronómicas y Geofísicas. Departamento de Sismología e Información Meteorológica; Argentina
dc.description.fil
Fil: García, Sebastian. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
dc.journal.title
Journal of South American Earth Sciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0895981121001565
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2021.103309
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