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dc.contributor.author
Lajoinie, Maria Florencia
dc.contributor.author
Lanfranchini, Mabel Elena
dc.contributor.author
Cingolani, Carlos Alberto
dc.contributor.author
Salvioli, Melisa Ariana
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de la Cal, Hernán Gabriel
dc.contributor.author
Etcheverry, Ricardo Oscar
dc.date.available
2022-01-18T17:32:42Z
dc.date.issued
2021-11
dc.identifier.citation
Lajoinie, Maria Florencia; Lanfranchini, Mabel Elena; Cingolani, Carlos Alberto; Salvioli, Melisa Ariana; de la Cal, Hernán Gabriel; et al.; Geochemical characterization of the El Cortijo Formation metacherts: New evidence of an oceanic rock sequence in the Palaeoproterozoic basement of the Tandilia Belt, Argentina, Río de la Plata Craton; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 111; 11-2021; 1-15
dc.identifier.issn
0895-9811
dc.identifier.uri
http://hdl.handle.net/11336/150255
dc.description.abstract
Archaean-Palaeoproterozoic cherts are rare and contain valuable information to understand the chemical evolution of oceans in the past, given that during most of this period an abiological deposition process has been interpreted for their formation, in which silica precipitated directly from seawater. In the Palaeoproterozoic basement of the Tandilia Belt (Argentina), Río de la Plata Craton (RPC), cherts have been mentioned as part of the El Cortijo Formation, which includes low-grade metamorphic rocks, such as metacherts, metawackes and metabasites. In order to provide conclusive evidence about the origin of this unit, detailed geochemical analysis and petrographic and field studies of the metacherts were performed. They allowed two groups of metacherts to be identified: gray-whitish (GWM) and green-bluish metacherts (GBM). The GWM present nodular and lens morphologies and are mainly composed of micro- and mesoquartz crystals with evidence of recrystallization processes. The GBM show a layered structure that consists of micro- and mesoquartz crystals recrystallized in fine bands, interspersed with bands composed of epidote, zoisite, chlorite and sericite. The multielement diagram (normalized to post-Archaean Australian shale) shows positive anomalies of La, Eu and Y and a slight enrichment of the heavy rare earth elements (HREE) with respect to the light rare earth elements (LREE), similar to seawater signatures, for the GWM. Eu anomalies between 1.2 and 1.4, a flat distribution of LREE and depleted contents of HREE are shown for the GBM. These characteristics indicate that the GWM derived from C-cherts (chemical cherts) sensu-stricto, while the GBM protolith is compatible with silicification of volcanic rocks, or S-cherts (silicified cherts), also considering the high lithophile element contents. Furthermore, the Ge/Si atomic ratios, from 1.48 x 10−6 to 4.79 x 10 −6, and Y/Ho ratios lower than 43.36 (for both chert types) indicate an influence of hydrothermal silica source. The study of the El Cortijo Formation cherts has revealed conclusive evidence about the origin of these marine rocks allowing a reinterpretation of the whole formation as an Oceanic Plate Stratigraphy complex in the Tandilia Belt basement, southern margin of the RPC.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
OCEAN PLATE STRATIGRAPHY
dc.subject
PALAEOPROTEROZOIC CHERTS
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REE + Y SEAWATER PATTERN
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TRANSAMAZONIAN CYCLE METAMORPHISM
dc.subject.classification
Geología
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Geochemical characterization of the El Cortijo Formation metacherts: New evidence of an oceanic rock sequence in the Palaeoproterozoic basement of the Tandilia Belt, Argentina, Río de la Plata Craton
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2022-01-06T14:56:07Z
dc.journal.volume
111
dc.journal.pagination
1-15
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Lajoinie, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Universidad Tecnológica Nacional. Facultad Regional La Plata. Departamento de Ingeniería Civil. Centro de Investigaciones Viales; Argentina
dc.description.fil
Fil: Lanfranchini, Mabel Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina
dc.description.fil
Fil: Cingolani, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Salvioli, Melisa Ariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
dc.description.fil
Fil: de la Cal, Hernán Gabriel. Roch S.A.; Argentina
dc.description.fil
Fil: Etcheverry, Ricardo Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
dc.journal.title
Journal of South American Earth Sciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.jsames.2021.103448
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981121002959
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