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Lower Paleozoic ‘El Nihuil Dolerites’: Geochemical and Isotopic Constraints of Mafic Magmatism in an Extensional Setting of the San Rafael Block, Mendoza, Argentina

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Pre-carboniferous Evolution of the San Rafael Block, Argentina

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Abstract

The ‘El Nihuil Mafic Unit’ is exposed at the Loma Alta region northwards of the El Nihuil dam. This igneous body consists mainly of mafic rocks assigned to the Precambrian and Lower Paleozoic according to different authors. The mafic unit shows an elongated shape with a NNE–SSW orientation on the western side of the San Rafael Block (SRB), developed for a length of 17.5 km and with a maximum width of 4.2 km and is composed of deformed gabbros, amphibolites, and tonalites that represent the Mesoproterozoic continental crust, and dykes and sills of undeformed Lower Paleozoic porphyritic dolerites. We present the petrology, geochemistry, isotope data, and determinations of emplacement conditions of the dolerites that could represent a sliver of Cuyania-Chilenia terranes suture. The dolerites show classical porphyritic texture, with elongated subhedral plagioclase (andesine) and clinopyroxene phenocrysts. Geochemical analyses of El Nihuil Dolerite samples indicate that the rocks are MORB-type basalts. In the P2O5 versus Zr diagram, the dolerites plot in the tholeiitic field similarly to western Cuyania basalts, and in the Th–Hf/3–Ta tectonic discrimination diagram the dolerite dykes plot mainly as E-MORB. Dolerite samples were dated by K–Ar (whole rock) systematic and the ages are 448.5 ± 10 and 434.2 ± 10 Ma (Upper Ordovician and close to the Lower Silurian boundary). The dolerites represent the unique Lower Paleozoic mafic rock outcrops within the SRB. Nd(TDM) ages are in between 0.51 and 0.80 Ga; εNd(0) record positive values ranging from +3.85 and +7.84; εNd(t) record +4.27 to +12.42. 87Sr/86Sr ratios are in between 0.7032 and 0.7050 in agreement with values for ocean ridge tholeiites. These mafic rocks are interpreted as a part of a dismembered ‘Famatinian ophiolite belt’ emplaced during the Lower Paleozoic extensional environment within a thinned Mesoproterozoic continental crust on western Cuyania terrane.

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Acknowledgements

This research was partially funded by CONICET (PIP 199) and by grants from the University of La Plata, Argentina. Many thanks to our colleagues Leandro Ortiz and Diego Licitra for their help during fieldworks and laboratory sample preparation. We appreciate the suggestions and guidance during laboratory work by Prof. Koji Kawashita (Brazil) and Prof. Ricardo Varela (CIG). We thank Gabriela Coelho dos Santos for her technical collaboration in petrographical descriptions.

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Authors and Affiliations

  1. Centro de Investigaciones Geológicas, CONICET-UNLP, Diag. 113 n. 275, CP1904, La Plata, Argentina

    Carlos A. Cingolani & Eduardo Jorge Llambías

  2. Programa de Pós-Graduação Em Geologia, Universidade Do Vale Do Rio Dos Sinos, São Leopoldo, RS, Brazil

    Farid Chemale Jr.

  3. Centro Universitario de la Región Este, Universidad de la República, Ruta 8 Km 282, Treinta y Tres, Uruguay

    Paulina Abre

  4. División Geología, Museo de La Plata, UNLP, Paseo Del Bosque s/n, B1900FWA, La Plata, Argentina

    Norberto Javier Uriz

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  1. Carlos A. Cingolani
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Correspondence to Carlos A. Cingolani .

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    Carlos Alberto Cingolani

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Cingolani, C.A., Llambías, E.J., Chemale, F., Abre, P., Uriz, N.J. (2017). Lower Paleozoic ‘El Nihuil Dolerites’: Geochemical and Isotopic Constraints of Mafic Magmatism in an Extensional Setting of the San Rafael Block, Mendoza, Argentina. In: Cingolani, C. (eds) Pre-carboniferous Evolution of the San Rafael Block, Argentina. Springer Earth System Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-50153-6_6

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