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Pre-carboniferous Evolution of the San Rafael Block, Argentina pp 221–238Cite as

The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints

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Abstract

One of the ‘pre-Carboniferous units’ from the San Rafael Block is the sedimentary Río Seco de los Castaños Formation, which is distributed in isolated outcrops within the Block. At the Rodeo de la Bordalesa area two small intrusives in the mentioned unit were mapped, composed of tonalitic rocks, lamprophyre (‘spessartite-kersantite’) and aplite dykes. We present in this paper, geochemical and isotopic data from the gray tonalitic rocks with abundant mafic enclaves and late magmatic aplite veins. The country rocks are a folded sequence of feldspathic sandstones, wackes, and shales. The Rodeo de la Bordalesa tonalite dykes are characterized by high to medium potassium concentration, with metaluminous composition and I-type calc-alkaline signature. The 401 ± 4 Ma U–Pb zircon age corresponds to the emplacement time and it is confirmed by the K–Ar biotite age. The Rb–Sr whole rocks and biotite age of 374 ± 4 Ma could be related to deformation during the ‘Chanic’ tectonic phase. Nd model ages (TDM) show an interval between 1 and 1.6 Ga, indicating Mesoproterozoic age derivation, whereas the negative ε Nd is typical from crustal sources. The crystallization age for the Rodeo de la Bordalesa tonalite corresponds to a Lower Devonian time and suggests that part of the Late Famatinian magmatic event is present in the San Rafael Block . The dykes are contemporaneous with the large peraluminous batholith in Pampeanas Ranges, with the transpressional shear belts during ‘Achalian’ event and could be correlated with the Devonian magmatism present in the southern part of the Frontal Cordillera. The geochemical and geochronological data allow us to differentiate the Rodeo de la Bordalesa tonalite from the mafic rocks exposed at the El Nihuil area.

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Acknowledgements

Field and laboratory work was financed by PIP-CONICET grants 647 and 199. We thank Ricardo Varela for Rb–Sr whole rock laboratory preparation. Diego Licitra, Leonardo Ortiz and Natalia Hernández helped us in field work, mineralogical separation, and petrographical descriptions. We acknowledge to Mario Campaña for technical assistance. To Alejandro Capelli for kind permission to access at the outcrops near the deactivated railroad tracks (‘Ferrocarril General San Martin’). Domingo Solorza from Puesto Cortaderas, helped us in a field work activities.

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Authors and Affiliations

  1. Centro de Investigaciones Geológicas, Universidad Nacional de La Plata, Diag. 113 n. 275, CP1904, La Plata, Argentina

    Carlos A. Cingolani & Eduardo Jorge Llambías

  2. Centro de Pesquisas Geocronológicas (CPGeo), Universidade de São Paulo, São Paulo, Brazil

    Miguel A. S. Basei

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

    Carlos A. Cingolani & Norberto Javier Uriz

  4. Programa de Pós-Graduação em Geologia, Universidade do Vale do Rio dos Sinos, 93.022-000, São Leopoldo, RS, Brazil

    Farid Chemale Jr.

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

    Paulina Abre

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  1. Carlos A. Cingolani
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  2. Eduardo Jorge Llambías
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  3. Miguel A. S. Basei
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Correspondence to Carlos A. Cingolani .

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  1. Centro de Investigaciones Geológicas (UNLP-CONICET), National University of La Plata, La Plata, Argentina

    Carlos Alberto Cingolani

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Cingolani, C.A., Llambías, E.J., Basei, M.A.S., Uriz, N.J., Chemale, F., Abre, P. (2017). The Rodeo de la Bordalesa Tonalite Dykes as a Lower Devonian Magmatic Event: Geochemical and Isotopic Age Constraints. 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_12

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