The Austral-Magallanes Basin (Southern Patagonia): A synthesis of its stratigraphy and evolution.

Autores/as

  • José I. Cuitiño Instituto Patagónico de Geología y Paleontología (CCT CONICET-CENPAT). Boulevard Brown 2915 (9120), Puerto Madryn, Chubut, Argentina.
  • Augusto N. Varela Y-TEC S.A, Av. del Petróleo s/n (1923), Berisso, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas CONICET, Argentina. Cátedra de Micromorfología de Suelos, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Calle 122 y 60 s/n, (1900) La Plata, Argentina.
  • Matías C. Ghiglione Instituto de Estudios Andinos-CONICET, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Argentina.
  • Sebastian Instituto Patagónico de Geología y Paleontología (CCT CONICET-CENPAT). Boulevard Brown 2915 (9120), Puerto Madryn, Chubut, Argentina.
  • Daniel G. Poiré Centro de Investigaciones Geológicas (CIG- CONICET – UNLP). Diagonal 113 275 (B1904DPK) La Plata, Argentina. Cátedra de Rocas Sedimentarias, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Calle 122 y 60 s/n, (1900) La Plata, Argentina.

Palabras clave:

Basin History Stratigraphic Synthesis Tectono-stratigraphy Sedimentology

Resumen

The Austral-Magallanes is an oil-producing basin located in southern Argentina and Chile, containing a siliciclastic stratigraphic record ranging from the Late Jurassic to late Cenozoic. This short paper finalize the two special volumes of the Latin American Journal of Sedimentology and Basin Analysis dedicated to the basin, and aims to provide a comprehensive synthesis based on the current knowledge about the chronology of deposition, stratigraphy, and tectonic events that shaped this basin. During the breakup of Gondwana in the Jurassic, an extensional phase was responsible for the beginning of accumulation of volcaniclastic material within grabens, which subsequently were covered by widespread Lower Cretaceous shallow and deep marine deposits that conforms the main hydrocarbon system. From Late Cretaceous onward, the subduction-related compressive regime associated to Andean uplift and fold and thrust belt migration was responsible for the onset of the foreland stage. During the Late Cretaceous, the foredeep zone accumulated a thick pile of deep marine deposits that graded upward to shallow marine and terrestrial deposits. During the Cenozoic, the foredeep was less marked and shallow marine and terrestrial sediments accumulated in wide areas, punctuated by important unconformities associated to foreland uplift. Future developments should focus on: i) improving the age-controlled stratigraphy; ii) joining the information provided by subsurface and outcrop studies; and iii) developing source to sink models to address the Andean impact in the sedimentation of the basin.

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Varela A.N., M.S. Raigemborn, S. Richiano, T. White, D.G. Poiré and S. Lizzoli, 2018. Late Cretaceous paleosols as paleoclimate proxies of high-latitude Southern Hemisphere: Mata Amarilla Formation, Patagonia, Argentina. Sedimentary Geology 363:83-95.

Varela, A.N., S. Richiano, L. D’Elia, D. Moyano Paz, C. Tettamanti and D.G. Poiré, 2019. Sedimentology and stratigraphy of the Puesto El Moro Formation, Patagonia, Argentina: Implications for Upper Cretaceous paleogeographic reconstruction and compartmentalization of the Austral-Magallanes Basin. Journal of South American Earth Sciences 92:466-480.

Wilson, T.J., 1991. Transition from Back-Arc to Foreland Basin Development in the Southernmost Andes-Stratigraphic Record from the Última-Esperanza-District, Chile. Geological Society of America Bulletin 103:98-111.

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Publicado

2021-03-31

Cómo citar

Cuitiño, J. I. ., Varela, A. N. ., Ghiglione, M. C. ., Richiano, S. ., & Poiré, D. G. . (2021). The Austral-Magallanes Basin (Southern Patagonia): A synthesis of its stratigraphy and evolution. Latin American Journal of Sedimentology and Basin Analysis, 26(2), 155-166. Recuperado a partir de https://lajsba.sedimentologia.org.ar/index.php/lajsba/article/view/56

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Volumen especial