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Combining shallow and deep geophysical information: the Yehuin–Chepelmut Fault Zone in the Magallanes fold and thrust belt (Tierra del Fuego, Argentina)

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Abstract

The outer Fuegian fold and thrust belt is the deformed sector of the Austral-Magallanes Basin, which underwent a contractional phase since the Late Cretaceous and a strike-slip phase during the Neogene. The area hosts two Neogene basins (Yehuin and Chepelmut) which have been mainly developed by the influence of wrench deformation, and were subsequently modified by glacial activity of the Ewan and Fuego glacier lobes of the Fagnano palaeoglacier. Geophysical surveys using Electrical Resistivity Tomography, onland shallow seismic surveys, and magnetometry, have been combined with outcrop analysis and deep seismic lines to recognize both shallow and intermediate deep structures related to the lacustrine basins. Four sets of faults with different deformation history were involved in the basin genesis. Comparison with the Deseado Fault Zone indicates similarities of the structural features between the two zones. The stress field interpreted as responsible for the origin of the studied basins is analogous to the one in the Deseado valley, located in the western Tierra del Fuego. Therefore, a transcurrent fault zone, here named Yehuin–Chepelmut Fault Zone, is proposed as part of the diffuse boundary between South America and Scotia plates.

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adapted from Buatois and Camacho (1993), Coronato et al. (2008a, b), Menichetti et al. (2008), Martinioni et al. (2013), Torres Carbonell et al. (2013) and Esteban et al. (2014). The geophysical profiles (red lines) are marked with numbers: (1) Profile GE-EN (Fig. 8a), M-EN (Fig. 8a) and S-EN (Fig. 7); (2) GE-EU (Fig. 8b), M-EU (Fig. 8b) and S-EU (Fig. 7); (3) Profile GE-WY (Fig. 8c), M-WY (Fig. 8c); (4) Yehuin Seismic Line 13 (Fig. 11); (5) Chepelmut Seismic Line 03 (Fig. 12); (6) Seismic line 18,108 (Fig. 6). References for lakes: LY Lago Yehuin, LC Lago Chepelmut, LYk Lago Yakush, LE Laguna Esperanza, LF Lago Fagnano. The stereoplot locations are indicated in red numbers, and correspond to outcrops where fault planes were measured. At the right side, the chrono-stratigraphic chart, modified from Menichetti et al. (2008). The stratigraphy is based on Olivero and Malumián (2008) and Martinioni et al. (2013). The inset box shows a rose diagram of mapped lineaments from high-resolution DEM, with the principal strain trends

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Acknowledgements

We acknowledge those people who contributed with field work in Tierra del Fuego: J.L. Hormaechea, G. Connon, L. Barbero and C. Ferrer of the EARG for their support during data acquisition in the field, M. Grossi (OGS) for seismic acquisition. Also, we want to acknowledge to the laborers and owner of Estancia Ushuaia, Juan, Torres and M. Viaña, which facilitated the stay and acquisition of the data; to D. Parum and their son for the access and guide across Cerro Shenolsh; to the Dirección General de Áreas Protegidas y Biodiversidad and Lic. M.L. Carranza, who allowed the permission for the field work. Also, we want to thank Dr. Ghiglione and other anonymous reviewer for their observations and corrections that were very helpful to improve significantly this work. In addition, we want to thank the editors, Dr. Wolf-Christian Dullo and Dr. David McNamara, for their support with the editorial process. Funds for this study were partly provided by the Italian Foreign Ministry (MAE) and the MiNCyT “La Agencia” PICT 2013–2236 projects, University of Buenos Aires (UBA), UBACyT 2014, and from Consorzio Universitario Italiano per l’Argentina (CUIA).

Funding

This article was funded by Ministerio de Ciencia, Tecnología e Innovación Productiva (Grant no. 2013-2236), Ministero degli Affari Esteri e della Cooperazione Internazionale, Universidad de Buenos Aires.

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Authors and Affiliations

  1. Depto. De Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina

    Jorge G. Lozano, Alejandro Tassone, Donaldo M. Bran, María E. Cerredo, Federico Esteban, Juan P. Ormazabal, José Ísola & Juan F. Vilas

  2. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina

    Jorge G. Lozano, Alejandro Tassone, Donaldo M. Bran, María E. Cerredo, Federico Esteban, Juan P. Ormazabal, José Ísola & Juan F. Vilas

  3. Departamento de Física, Facultad de Ciencias Exactas y Naturales (FCEyN), Universidad de Buenos Aires, IFIBA-CONICET, Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón I, Buenos Aires, Argentina

    Luciano Onnis

  4. Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Trieste, Italy

    Emanuele Lodolo & Luca Baradello

  5. Dipartimento di Scienze Pure ed Applicate, Università di Urbino, Urbino, Italy

    Marco Menichetti

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  1. Jorge G. Lozano
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  8. Federico Esteban
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  9. Juan P. Ormazabal
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  11. Luca Baradello
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  12. Juan F. Vilas
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Correspondence to Jorge G. Lozano.

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Lozano, J.G., Tassone, A., Bran, D.M. et al. Combining shallow and deep geophysical information: the Yehuin–Chepelmut Fault Zone in the Magallanes fold and thrust belt (Tierra del Fuego, Argentina). Int J Earth Sci (Geol Rundsch) 109, 971–994 (2020). https://doi.org/10.1007/s00531-020-01847-3

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  • DOI: https://doi.org/10.1007/s00531-020-01847-3

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