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Cenozoic Deformational Processes in the North Patagonian Andes Between 40° and 43°S

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Growth of the Southern Andes

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Abstract

The Cenozoic tectonic evolution of the North Patagonian Andes is analyzed linking geological and geophysical data in order to decipher the deformational processes that acted through time and relate them to basin formation. Field observations and seismic reflection profiles reveal the shallow structure of the retroarc area where contractional structures, associated with Oligocene to early Miocene inverted extensional sections, are partially onlapped by early to late Miocene synorogenic deposits. From the construction of five structural cross sections along the retroarc area between 40° and 43° 30′S, constrained by surface, gravity, and seismic data, a shortening gradient is observed along Andean strike. The highest shortening of 18.7 km (15.34 %) is determined near to 41° 30′S where basement blocks were uplifted in the orogenic front area, and the deepest and broadest synorogenic depocenters were formed toward the foreland. Additionally, eastward shifting of Miocene calc-alkaline arc rocks occurred at these latitudes, which is interpreted as indicative of a significant change in the subduction parameters at this time. Deep crustal retroarc structure is evaluated through inversion of gravity models that made also possible to infer Moho attenuated zones. These coincide with the occurrence of younger than 5 Ma within-plate volcanics as well as with crustal thermal anomalies suggested by shallowing of the Curie isotherm calculated from magnetic data.

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Authors and Affiliations

  1. Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro—CONICET, General Roca (Río Negro), Argentina

    Darío L. Orts

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

    Andrés Folguera & Emilio Agustín Rojas Vera

  3. Instituto Geofísico y Sismológico Ing. Volponi, Universidad Nacional de San Juan, Ruta 12-km17, San Juan, Argentina

    Mario Gimenez, Francisco Ruiz & Federico Lince Klinger

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

    Mario Gimenez & Federico Lince Klinger

  5. Departamento de Ciencias de la Tierra, Universidad de Concepción, Casilla 160-c, Concepción, Chile

    Alfonso Encinas

Authors
  1. Darío L. Orts
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  2. Andrés Folguera
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  3. Mario Gimenez
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  4. Francisco Ruiz
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  5. Alfonso Encinas
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  6. Emilio Agustín Rojas Vera
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  7. Federico Lince Klinger
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Corresponding author

Correspondence to Darío L. Orts .

Editor information

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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© 2016 Springer International Publishing Switzerland

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Orts, D.L. et al. (2016). Cenozoic Deformational Processes in the North Patagonian Andes Between 40° and 43°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_8

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