Boron isotope variations in a single monogenetic cone: La Porun tilde a (21 degrees 53 ' S, 68 degrees 30 ' W), Central Andes, Chile

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datacite.alternateIdentifier.citationLithos, Vol.440, N°, 107030-107030, 2023.
datacite.alternateIdentifier.doi10.1016/j.lithos.2023.107030
datacite.alternateIdentifier.issn0024-4937
datacite.creatorGodoy, Benigno
datacite.creatorDeegan, Frances M.
datacite.creatorGonzalez Maurel, Osvaldo
datacite.creatorle Roux, Petrus
datacite.creatorGarbe Schoenberg, Dieter
datacite.creatorRodriguez, Ines
datacite.creatorGuzman Marusic, Gabriela
datacite.creatorMarin, Carolina
datacite.date2023
datacite.rightsAcceso Abierto
datacite.subjectAndes Centrales
datacite.subjectla Porun ? a
datacite.subjectIsótopos de Boro
datacite.subjectAsimilación Crustal
datacite.subject.englishCentral Andes
datacite.subject.englishLa Porun ? a
datacite.subject.englishBoron isotopes
datacite.subject.englishCrustal assimilation
datacite.titleBoron isotope variations in a single monogenetic cone: La Porun tilde a (21 degrees 53 ' S, 68 degrees 30 ' W), Central Andes, Chile
dc.date.accessioned6/8/23 11:48
dc.date.available6/8/23 11:48
dc.description.abstractLa Porun similar to a is a monogenetic volcano located within the Altiplano-Puna Volcanic Complex (21 degrees-24 degrees S) in the Central Andean subduction zone. Since crustal contamination of Andean magmas is ubiquitous, and because extensive geochemical data exist for La Porun similar to a, we employ this volcano as a case study to examine the behavior of boron isotopes during crustal assimilation. We present whole-rock boron concentration and 11B/10B ratios (as 811B values) for La Porun similar to a lava samples that were prepared as nano-particulate pressed pellets. La Porun similar to a B contents range from 14 to 20 mu g/g and 811B values range from -1.39 +/- 0.54 %o (20) to +0.94 +/- 0.30 %o (20), which overlap with the range of available whole-rock data for Central Andean lavas. Moreover, La Porun similar to a 811B values correlate negatively with 87Sr/86Sr ratios from the same samples. Since 87Sr/86Sr is a proxy for crustal contamination at La Porun similar to a, the data lead us to suggest that La Porun similar to a magmas assimilated a low-811B, high 87Sr/86Sr component such as Andean continental crust. Mixing models based on B and Sr isotopes support a broadly two-step magma evolution for La Porun similar to a. In step 1, mantle-derived primary melts interacted with boronrich slab-derived fluids with high 811B values, which yielded subduction-modified parental magmas with ca. 3 mu g/g B and relatively high 811B values. In step 2, the high 811B parental magmas ascended through the crust where they assimilated up to 20% crustal material, which further modified their 811B values and 87Sr/86Sr ratios. In comparison to available regional values for B and 811B, it appears that La Porun similar to a and nearby volcanic centers shared a similar source and magmatic history, whereas volcanoes south of 23 degrees S differ. We stress, however, that deconvolving the roles of various subduction and crustal inputs in the Central Andes would require further studies on individual volcanoes along the arc.
dc.identifier.issn0024-4937
dc.identifier.urihttps://repositoriodigital.uct.cl/handle/10925/5347
dc.language.isoen
dc.publisherElsevier
dc.sourceLithos
oaire.citation.endPage107030
oaire.citation.startPage107030
oaire.citation.volume440
oaire.fundingReferenceFondo Nacional de Desarrollo Científico y Tecnológico - FONDECYT
oaire.fundingReferenceSwedish Research Council - Vetenskapsrådet
oaire.fundingReferenceDepartment of Earth Sciences, Uppsala University - Section for Natural Resources and Sustainable Development - NRHU
oaire.fundingReferenceNational Research Foundation (South Africa)
oaire.licenseConditionObra bajo licencia Creative Commons Atribución 4.0 Internacional
oaire.licenseCondition.urihttps://creativecommons.org/licenses/by/4.0/
oaire.resourceTypeArtículo
oaire.resourceType.enArticle
uct.catalogadorjvu
uct.comunidadIngenieríaen_US
uct.departamentoDepartamento de Obras Civiles y Geología
uct.facultadFacultad de Ingeniería
uct.indizacionSocial Sciences Citation Index - SSCI
uct.indizacionScopus
uct.indizacionPubMed
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