La Horqueta Formation: Geochemistry, Isotopic Data, and Provenance Analysis

dc.creatorAbre, Paulina
dc.creatorCingolani, Carlos Alberto
dc.creatorChemale Jr., Farid
dc.creatorUriz, Norberto Javier
dc.creatorCingolani, Carlos Alberto
dc.date2017
dc.date2023-04-24T18:55:39Z
dc.date.accessioned2023-07-15T10:18:02Z
dc.date.available2023-07-15T10:18:02Z
dc.identifierhttp://sedici.unlp.edu.ar/handle/10915/152054
dc.identifierissn:2197-9596
dc.identifierisbn:978-3-319-50153-6
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7491343
dc.descriptionLa Horqueta Formation is developed from the Seco de las Peñas River to Agua de la Piedra creek within the San Rafael block and was deposited in a marine environment. It comprises dominantly metasandstones, although metasiltstones, metapelites, and rare metaconglomerates are also present. The base of the succession is not exposed and it is superposed through unconformity by Upper Carboniferous units. La Horqueta Formation is folded and shows cleavage. Provenance analyses based on whole-rock geochemistry and isotope data is the main focus of the work. Whole-rock geochemical data point to a derivation from unrecycled upper continental crust, based mainly on Th/Sc, Zr/Sc, La/Th, and Th/U ratios and rare earth element (REE) patterns (including Eu anomalies). Sc, Cr, and V concentrations and low Th/Sc ratios are indicative of a source slightly less evolved than the average upper continental crust. The εNd values are within the range of variation of data from the Mesoproterozoic Cerro La Ventana Formation, which is part of the basement of the Cuyania terrane outcropping within the San Rafael block. The Rb-Sr whole-rock data indicate that the low-grade metamorphism and folding events are Devonian in age. U-Pb detrital zircon ages suggest main derivation from the Mesoproterozoic (“Grenvillian-age”) basement of the San Rafael block and the Pampean–Brasiliano cycle, as well as a detrital input from the Río de la Plata craton and the Famatinian belt. Despite geochemical similarities, Río Seco de los Castaños Formation display different proportions of detrital zircon ages, when compared to La Horqueta Formation.
dc.descriptionCentro de Investigaciones Geológicas
dc.formatapplication/pdf
dc.languageen
dc.publisherSpringer
dc.rightshttp://creativecommons.org/licenses/by-nc-sa/4.0/
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.subjectGeología
dc.subjectGeochemistry
dc.subjectIsotope data
dc.subjectProvenance
dc.subjectLa Horqueta Formation
dc.subjectSan Rafael Block
dc.subjectCuyania terrane
dc.titleLa Horqueta Formation: Geochemistry, Isotopic Data, and Provenance Analysis
dc.typeLibro
dc.typeCapitulo de libro


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