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The low-grade basement at Península La Carmela, Chilean Patagonia: new data for unraveling the pre-Permian basin nature of the Eastern Andean Metamorphic Complex

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Abstract

The Eastern Andean Metamorphic Complex at Península La Carmela (48°50’S) consists of quartz-rich metaturbiditic sequences with tectonic slices of pillow metabasalt bodies deformed under low-grade metamorphic conditions. Previous and new detrital zircon U–Pb geochronological data from metasandstones indicate a preferred early Carboniferous maximum depositional age of the protolith, interpreted from the youngest single zircon grains of several metasedimentary rocks in the area. The wide spectrum of zircon ages from Península La Carmela, includes Neoproterozoic-early Paleozoic components and subordinate ancient zircon grains (> 2200 Ma). They were sourced from cratonic regions and/or reworked material from older metasedimentary successions and plutonic belts in southwestern Gondwana (e.g., North Patagonian and Deseado massifs or from the Tierra del Fuego Igneous and Metamorphic Complex). The pillow metabasalts have geochemical affinities of normal mid-oceanic ridge basalts and island-arc tholeiites with Nb–Ta negative anomalies, derived from a depleted mantle source (εNdt of + 6 and + 7.5). In consideration that pillow metabasalts with ocean island basalt affinities are reported, we propose that metaturbiditic successions and metabasalts were tectonically juxtaposed within a pre-Permian accretionary wedge of an active continental margin, after the development of island arcs and back-arc marginal basins.

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Fig. 1

modified from Calderón et al. (2016); B local geological sketch of the Lago O´Higgins-San Martín. Modified to De la Cruz and Suárez (2004) and Rojo (2017); C La Carmela Peninsula with a spot of samples analyzed. TFIMC: Tierra del Fuego Metamorphic Complex; DYC: Duque de York Complex; NV: Nunatak Unit; CMC: Chonos Metamorphic Complex; MDAC: Madre de Dios Accretionary Complex; SASZ: Seno Arcabuz Shear Zone; CMSZ; Canal de las Montañas; MTFB: Magallanes Thrust and Fold Belt; MFFZ: Magallanes-Fagnano Fault Zone

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Acknowledgements

The authors would like to thank Dr. Mark Fanning for performing the geochrological analysis of zircons, as well as the support and assistance of the Ciencia Joven program of the Instituto Chileno de Campos de Hielo. Dayvi Mancilla is acknowledged for their hospitality and assistance during the fieldwork at Península La Carmela and Villa O'Higgins. This research has been funded by Fondecyt projects 1161818 (MC) and 1180457 (FH). The manuscript was highly benefited by the suggestions of Dr. Sebastian Oriolo and an anonymous reviewer. Likewise, we are grateful to the associate editor for editorial assistance.

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Authors and Affiliations

  1. Facultad de Ingeniería Y Arquitectura, Universidad Arturo Prat, Av. Arturo Prat 2120, Iquique, Chile

    D. Rojo

  2. Instituto de Estudios Andinos IDEAN (Universidad de Buenos Aires - CONICET), Buenos Aires, Argentina

    D. Rojo, M. C. Ghiglione & R. J. Suárez

  3. Facultad de Ingeniería, Universidad del Desarrollo, Av. Plaza 680, Las Condes, Chile

    M. Calderón

  4. Departamento de Ciencias Naturales Y Tecnología, Universidad de Aysén, Obispo Vielmo 62, Coyhaique, Chile

    P. Quezada

  5. Instituto LAMIR, Universidade Federal Do Paraná, Centro Politécnico, Jardim das Américas, Curitiba, PR, 81531-980, Brazil

    P. Quezada

  6. Carrera de Geología, Facultad de Ingeniería, Universidad Andrés Bello, Sazié, 2129, Santiago, Chile

    J. Cataldo, F. Hervé, R. Charrier, M. Suárez & G. Guettner

  7. Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile

    F. Hervé & R. Charrier

  8. Departamento de Geología, Universidad de Atacama, Copayapu 485, Copiapó, Chile

    G. Galaz

  9. Mineralogy and Geotectonic Department, Geosciences Institute, University of São Paulo, São Paulo, Brazil

    M. Babinski

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  1. D. Rojo
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  2. M. Calderón
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  8. R. Charrier
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  9. G. Galaz
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Correspondence to D. Rojo.

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Rojo, D., Calderón, M., Ghiglione, M.C. et al. The low-grade basement at Península La Carmela, Chilean Patagonia: new data for unraveling the pre-Permian basin nature of the Eastern Andean Metamorphic Complex. Int J Earth Sci (Geol Rundsch) 110, 2021–2042 (2021). https://doi.org/10.1007/s00531-021-02054-4

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