Advertisement

STRATI 2013 pp 499-501 | Cite as

Tectonic Implications of Deep-Marine Miocene Strata in the Western Andean Cordillera of South–Central Chile (40°–42°S)

  • Alfonso EncinasEmail author
  • Patricio Zambrano
  • Pablo Bernabé
  • Kenneth Finger
  • Luis Buatois
  • Victor Valencia
  • Mark Fanning
  • Francisco Hervé
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Marine Cenozoic strata crop out in the western flank of the North Patagonian Andes at Lago Ranco (40°S) and Ayacara (42°S). These deposits, known as the Estratos de Lago Ranco and Ayacara formations, consist of rhythmic successions of sandstone and siltstone. In order to unravel the sedimentary environment, age, and tectonic history of this area during the Neogene, we conducted sedimentological, ichnological, and micropalaeontological studies. In addition, we dated detrital zircons by U–Pb (LAICPMS and SHRIMP). Our results show that these strata were deposited in a deep-marine environment during the early–middle Miocene. Our findings indicate that the uplift of the western flank of the North Patagonian Andes took place after the early–middle Miocene.

Keywords

North Patagonian Andes Southern Chile U–Pb 

References

  1. Cembrano, J., Lavenu, A., Reynolds, P., Arancibia, G., López, G., & Sanhueza, A. (2002). Late cenozoic transpressional ductile deformation north of the Nazca-South America–Antarctica triple junction. Tectonophysics,354, 289–314.CrossRefGoogle Scholar
  2. Covacevich, V. (1996). Muestreos paleontológicos en el Teciario marino de la costa sur del lago Ranco (p. 4). Informe interno, Servicio Nacional de Geología y Minería.Google Scholar
  3. Hervé, F. (1994). The southern andes between 39° and 44°S latitude: The geological signature of a transpresive tectonic regime related to a magmatic arc. In K. J. Reutter, E. Scheuber & P. Wigger (Eds.), Tectonics of the Southern Central Andes (pp. 243–248). Springer.Google Scholar
  4. Levi, B., Aguilar, A., & Fuenzalida, R. (1966). Reconocimiento geológico en las provincias de Llanquihue y Chiloé. Santiago, Inst. Invest. Geol. 19, p. 45.Google Scholar
  5. Martínez-Pardo, R. (1965). Edad de la Formación Ayacara en Caleta El Manzano e Isla El Manzano. Soc. Geol. Chile, Resúmenes, 19–22. Google Scholar
  6. Sernageomin (1995) Carta metalogénica décima región sur, Chile. SERNAGEOMIN-BRGM, Internal Report IR-95-05. Vol. 10, Santiago.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Alfonso Encinas
    • 1
    Email author
  • Patricio Zambrano
    • 1
  • Pablo Bernabé
    • 1
  • Kenneth Finger
    • 2
  • Luis Buatois
    • 3
  • Victor Valencia
    • 4
  • Mark Fanning
    • 5
  • Francisco Hervé
    • 6
  1. 1.Departamento de Ciencias de la TierraUniversidad de ConcepciónConcepciónChile
  2. 2.University of California Museum of PaleontologyBerkeleyUSA
  3. 3.Department of Geological SciencesUniversity of SaskatchewanSaskatoonCanada
  4. 4.School of Earth and Environmental SciencesWashington State UniversityPullmanUSA
  5. 5.Research School of Earth SciencesAustralian National UniversityCanberraAustralia
  6. 6.Departamento de Ciencas de la TierraUniversidad de ChileSantiagoChile

Personalised recommendations