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Abstract:

The Caucete Group is a low-grade metasedimentary sequence of probable late Neoproterozoic-Cambrian age. It is exposed on the western flank of the Sierra de Pie de Palo, a basement block of the Cuyania terrane from western Argentina. The geochemical composition (major, trace and rare-earth elements, and Sm-Nd isotopes) of the El Quemado, La Paz, El Desecho, and Angacos formations (Caucete Group) was used to characterize the sedimentary provenance. We recognized two types of sources: A felsic source (crustal signature) and another mafic source with juvenile signature. Provenance is interpreted to be the mixing between Paleoproterozoic felsic rocks and Mesoproterozoic-Neoproterozoic juvenile rocks sources. This is supported by previous geochronological studies. The Cuyania basement is interpreted to be the Mesoproterozoic and Neoproterozoic juvenile component defined in the Caucete Group (e.g.: ophiolite assemblage of Sierra de Pie de Palo). The Cuyania basement is also considered to be the felsic source (paragneisses and meta-greywackes of the Pie de Palo Complex). We do not consider Gondwana as a provenance source based on the discrepancies in the Sm-Nd isotopic signatures and the detrital zircon provenance ages between the Caucete Group and the surrounding units that are considered to be autochthonous to the southern margin of Gondwana. The Caucete Group Laurentian Sm-Nd isotopic signature suggests that this sector could have been part of the source area. Hence an allochthonous origin for the Caucete Group (Cuyania terrane), derived from southern Laurentia, is supported for the geochemical results presented in this contribution. © 2010 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance
Autor:Naipauer, M.; Cingolani, C.A.; Vujovich, G.I.; Chemale Jr., F.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
Laboratorio de Tectónica Andina, Depto. de Ciencias Geológicas, FCEyN, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428-Buenos Aires, Argentina
Centro de Investigaciones Geológicas, FCNyM, Universidad Nacional de La Plata, calle 1 N0 644, La Plata, Argentina
Núcleo de Geociências, Universidade Federal do Sergipe, Brazil
Palabras clave:Caucete group; Cuyania terrane; Lithogeochemistry; Nd isotopic composition; Provenance; Cambrian; geochemistry; isotopic composition; metasedimentary rock; neodymium isotope; Proterozoic; provenance; rare earth element; trace element; Argentina; San Juan [Argentina]; Sierra de Pie de Palo; Sierras Pampeanas
Año:2010
Volumen:30
Número:2
Página de inicio:84
Página de fin:96
DOI: http://dx.doi.org/10.1016/j.jsames.2010.03.002
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v30_n2_p84_Naipauer

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Citas:

---------- APA ----------
Naipauer, M., Cingolani, C.A., Vujovich, G.I. & Chemale Jr., F. (2010) . Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance. Journal of South American Earth Sciences, 30(2), 84-96.
http://dx.doi.org/10.1016/j.jsames.2010.03.002
---------- CHICAGO ----------
Naipauer, M., Cingolani, C.A., Vujovich, G.I., Chemale Jr., F. "Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance" . Journal of South American Earth Sciences 30, no. 2 (2010) : 84-96.
http://dx.doi.org/10.1016/j.jsames.2010.03.002
---------- MLA ----------
Naipauer, M., Cingolani, C.A., Vujovich, G.I., Chemale Jr., F. "Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance" . Journal of South American Earth Sciences, vol. 30, no. 2, 2010, pp. 84-96.
http://dx.doi.org/10.1016/j.jsames.2010.03.002
---------- VANCOUVER ----------
Naipauer, M., Cingolani, C.A., Vujovich, G.I., Chemale Jr., F. Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance. J. South Am. Earth Sci. 2010;30(2):84-96.
http://dx.doi.org/10.1016/j.jsames.2010.03.002