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dc.contributor.author
Coira, Beatriz Lidia Luisa

dc.contributor.author
Galli, Claudia Inés

dc.contributor.author
Mahlburg Kay, Suzanne

dc.contributor.author
Stockli, Daniel F.
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Flores, Patrocinio Ismael

dc.contributor.author
Eveling, Emilio José

dc.date.available
2023-05-09T19:14:35Z
dc.date.issued
2022-01
dc.identifier.citation
Coira, Beatriz Lidia Luisa; Galli, Claudia Inés; Mahlburg Kay, Suzanne; Stockli, Daniel F.; Flores, Patrocinio Ismael; et al.; Pliocene-Pleistocene ash-fall tuff deposits in the intermountain Humahuaca and Casa Grande basins, northwestern Argentina: tracers in chronostratigraphic reconstructions and key to identify their volcanic sources; Servicio Nacional de Geología y Minería; Andean Geology; 49; 2; 1-2022; 208-237
dc.identifier.issn
0718-7092
dc.identifier.uri
http://hdl.handle.net/11336/196915
dc.description.abstract
Ash-fall tuffs of the Pliocene-Pleistocene deposits of Humahuaca and Casa Grande intermountain basins, northwestern Argentina, have been differentiated into two groups based on new geochemical and geochronological data which correspond to the tuffs of the Pliocene-Lower Pleistocene alluvial fan deposits dominated by debris flow, deep sandy gravel braided, and shallow ephemeral lake deposits (Uquia and Mal Paso formations), and those recorded in Pleistocene alluvial fans sheet flood deposits. The two clusters of ages recognized: 4.3 to 2.6 Ma, and 2.2-pre 0.8 Ma, corresponding to these tuff groups, are in agreement with pulses of ignimbrite eruptions in the Altiplano Puna Volcanic Complex (APVC), and Southerm Puna calderas located west of the study region. The ash-fall tuffs of both groups are mainly vitreous to phenocryst-poor of rhyodacite-dacite composition with minor andesites to trachyandesites, characterized by 58-69% SiO2 contents, A/CNK 1-1.4, FeO/MgO (0.8-2.8), which plot in the calc-alkaline range. They can be differentiated based on its immobile trace elements ratios as indicated by a slight enrichment in LREE, higher arc affiliation and somewhat higher Sm/Yb ratios in the case of the younger group, although in both Sm/Yb ratios are indicative of sequestration of HREE in residual hornblende. The new geochemical and geochronological data of those ash fall tuffs point to these as chrono-stratigraphic tracers of the Humahuaca and Casa Grande intermountain basins stratigraphy, during the Pliocene-Pleistocene, also as the key to identify their volcanic sources.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Servicio Nacional de Geología y Minería

dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
ASH-FALL TUFFS
dc.subject
PLIOCENE-PLEISTOCENE
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HUMAHUACA-CASA GRANDE INTERMOUNTAIN BASINS
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NORTHWEST-ARGENTINA
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
Pliocene-Pleistocene ash-fall tuff deposits in the intermountain Humahuaca and Casa Grande basins, northwestern Argentina: tracers in chronostratigraphic reconstructions and key to identify their volcanic sources
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-07-04T20:17:11Z
dc.identifier.eissn
0718-7106
dc.journal.volume
49
dc.journal.number
2
dc.journal.pagination
208-237
dc.journal.pais
Chile

dc.journal.ciudad
Santiago de Chile
dc.description.fil
Fil: Coira, Beatriz Lidia Luisa. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentina
dc.description.fil
Fil: Galli, Claudia Inés. Universidad Nacional de Jujuy. Instituto de Ecorregiones Andinas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Ecorregiones Andinas; Argentina. Universidad Nacional de Salta; Argentina
dc.description.fil
Fil: Mahlburg Kay, Suzanne. Cornell University; Estados Unidos
dc.description.fil
Fil: Stockli, Daniel F.. University of Texas; Estados Unidos
dc.description.fil
Fil: Flores, Patrocinio Ismael. Universidad Nacional de Jujuy. Instituto de Geología Minera; Argentina
dc.description.fil
Fil: Eveling, Emilio José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentina
dc.journal.title
Andean Geology

dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.andeangeology.cl/index.php/revista1/article/view/V49n2-3377
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5027/andgeoV49n2-3377
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