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Tectonic Evolution of the Northern Patagonian Andes (40°S)

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Growth of the Southern Andes

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Abstract

This chapter is focused on the tectonic evolution of the North Patagonian Andes comprised between 38° and 40°S. Field recognition of main structures allowed establishing a structural control for the main sedimentary packages that coexisted with Andean development. These structures affect Miocene strata at the eastern deformational front, indicating a last stage of development, although cooling ages suggest a Mid to Late Cretaceous exhumation of the Paleozoic basement exposed at the westernmost sector. Synextensional deposits of late Oligocene age imply an interruption of Andean constructional mechanisms at these latitudes. Finally, seismic tomographies at these latitudes show an area of relatively low seismic velocities in the orogenic front area, separated from the arc front zone. Computed elastic thicknesses from gravity data show a good correlation with these areas with abnormal heat flow associated with retroarc stretching and magmatic emplacement in the last 5–2 Ma.

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Authors and Affiliations

  1. Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Instituto de Estudios Andinos “Don Pablo Groeber” UBA-CONICET, Buenos Aires, Argentina

    Miguel E. Ramos, Andrés Folguera, Lucas Fennell & Victor A. Ramos

  2. Instituto Geofísico y Sismológico Ing. Volponi, Universidad Nacional de San Juan, Ruta 12-Km17, San Juan, Argentina

    Mario Giménez

  3. Consejo Nacional de Investigaciones Cientifícas y Técnicas (CONICET), Buenos Aires, Argentina

    Mario Giménez

Authors
  1. Miguel E. Ramos
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  2. Andrés Folguera
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  3. Lucas Fennell
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  4. Mario Giménez
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  5. Victor A. Ramos
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Corresponding author

Correspondence to Miguel E. Ramos .

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Editors and Affiliations

  1. Estudios Andinos “Don Pablo, Groeber”, Departamento de Ciencias Geológicas, Estudios Andinos “Don Pablo, Groeber”, Buenos Aires, Argentina

    Andrés Folguera

  2. Departamento de Ciencias Geológicas, FCEN - Universidad de Buenos Aires, Instituto de Estudios Andinos “Don Pablo Groeber” and CONICET, Buenos Aires, Argentina

    Maximiliano Naipauer

  3. Departamento de Ciencias Geológicas, FCEN - Universidad de Buenos Aires, Instituto de Estudios Andinos “Don Pablo Groeber” and CONICET, Buenos Aires, Argentina

    Lucía Sagripanti

  4. Departamento de Ciencias Geológicas, FCEN - Universidad de Buenos Aires, Instituto de Estudios Andinos “Don Pablo Groeber” and CONICET, Buenos Aires, Argentina

    Matías C. Ghiglione

  5. Universidad Nacional de Río Negro - CONI, Instituto de Investigación en Paleobiolo Universidad Nacional de Río Negro - CONI, General Roca (Río Negro), Argentina

    Darío L. Orts

  6. Centro Regional de Investigaciones Científicas y Tecnológicas, IANIGLA, CCT Mendoza, Mendoza, Argentina

    Laura Giambiagi

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Ramos, M.E., Folguera, A., Fennell, L., Giménez, M., Ramos, V.A. (2016). Tectonic Evolution of the Northern Patagonian Andes (40°S). In: Folguera, A., Naipauer, M., Sagripanti, L., C. Ghiglione, M., Orts, D., Giambiagi, L. (eds) Growth of the Southern Andes. Springer Earth System Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-23060-3_7

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