Abstract:
The Chilean margin has been used as the model of an ocean-continent convergent system dominated by compression and active mountain building as a consequence of the strong mechanical coupling between the upper and the lower plates. The Andean Cordillera, however, shows evidence of alternating phases of compressional and extensional deformation. Volcano-sedimentary marine strata in the Aysén region of southern Chile contribute to an understanding of the causes of extensional tectonics and crustal thinning that occurred in the Andean orogeny because these deposits constitute the only reliable record of submarine suprasubduction volcanism during the Cenozoic in southern South America. In order to discern the age and tectono-sedimentary setting of these strata, referred to as the Traiguén Formation, we integrated sedimentology, ichnology, petrography, geochemistry, structural geology, foraminiferal micropaleontology, and U-Pb geochronology. Our results indicate that the Traiguén Formation was deposited in a deep-marine extensional basin during the late Oligocene-earliest Miocene. The geochemistry and petrography of the pillow basalts suggest that they formed in a convergent margin on a thinned crust rather than at an oceanic spreading center. We attribute the origin of the Traiguén Basin to a transient period of slab rollback and vigorous asthenospheric wedge circulation that was caused by an increase in trench-normal convergence rate at ca. 26-28 Ma and that resulted in a regional event of extension and widespread volcanism. © 2015 Geological Society of America.
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Documento: |
Artículo
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Título: | Late Oligocene-early Miocene submarine volcanism and deep-marine sedimentation in an extensional basin of southern Chile: Implications for the tectonic development of the North Patagonian Andes |
Autor: | Encinas, A.; Folguera, A.; Oliveros, V.; De Girolamo Del Mauro, L.; Tapia, F.; Riffo, R.; Hervé, F.; Finger, K.L.; Valencia, V.A.; Gianni, G.; Álvarez, O. |
Filiación: | Departamento de Ciencias de la Tierra, Facultad de Ciencias Químicas, Universidad de Concepción, Concepción, 4030000, Chile Instituto de Estudios Andinos Don Pablo Groeber, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires-CONICET, Buenos Aires, C1428EHA, Argentina Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, 6511228, Chile Carrera de Geologia, Universidad Andres Bello, Salvador Sanfuentes 2357, Santiago, 837-0211, Chile University of California Museum of Paleontology, Berkeley, CA 94720, United States School of the Environment, Washington State University, Pullman, WA 99164, United States Instituto Geofísico Sismológico Ing. Fernando Volponi, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad de San Juan, San Juan 5400, Argentina Consejo Nacional de Investigaciones Cientifícas y Técnicas, CONICET, Buenos Aires, C1033AAJ, Argentina
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Palabras clave: | Geochemistry; Lead; Petrography; Sedimentology; Structural geology; Submarines; Tectonics; Convergent systems; Extensional deformation; Extensional tectonics; Mechanical coupling; Southern south america; Submarine volcanism; Tectonic development; U-Pb geochronology; Geochronology; crustal thinning; deep sea; extensional tectonics; Miocene; Oligocene; sedimentation; submarine volcano; tectonic evolution; volcanism; Andes; Patagonia |
Año: | 2016
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Volumen: | 128
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Número: | 5-6
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Página de inicio: | 807
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Página de fin: | 823
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DOI: |
http://dx.doi.org/10.1130/B31303.1 |
Título revista: | Bulletin of the Geological Society of America
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Título revista abreviado: | Bull. Geol. Soc. Am.
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ISSN: | 00167606
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CODEN: | BUGMA
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167606_v128_n5-6_p807_Encinas |
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Citas:
---------- APA ----------
Encinas, A., Folguera, A., Oliveros, V., De Girolamo Del Mauro, L., Tapia, F., Riffo, R., Hervé, F.,..., Álvarez, O.
(2016)
. Late Oligocene-early Miocene submarine volcanism and deep-marine sedimentation in an extensional basin of southern Chile: Implications for the tectonic development of the North Patagonian Andes. Bulletin of the Geological Society of America, 128(5-6), 807-823.
http://dx.doi.org/10.1130/B31303.1---------- CHICAGO ----------
Encinas, A., Folguera, A., Oliveros, V., De Girolamo Del Mauro, L., Tapia, F., Riffo, R., et al.
"Late Oligocene-early Miocene submarine volcanism and deep-marine sedimentation in an extensional basin of southern Chile: Implications for the tectonic development of the North Patagonian Andes"
. Bulletin of the Geological Society of America 128, no. 5-6
(2016) : 807-823.
http://dx.doi.org/10.1130/B31303.1---------- MLA ----------
Encinas, A., Folguera, A., Oliveros, V., De Girolamo Del Mauro, L., Tapia, F., Riffo, R., et al.
"Late Oligocene-early Miocene submarine volcanism and deep-marine sedimentation in an extensional basin of southern Chile: Implications for the tectonic development of the North Patagonian Andes"
. Bulletin of the Geological Society of America, vol. 128, no. 5-6, 2016, pp. 807-823.
http://dx.doi.org/10.1130/B31303.1---------- VANCOUVER ----------
Encinas, A., Folguera, A., Oliveros, V., De Girolamo Del Mauro, L., Tapia, F., Riffo, R., et al. Late Oligocene-early Miocene submarine volcanism and deep-marine sedimentation in an extensional basin of southern Chile: Implications for the tectonic development of the North Patagonian Andes. Bull. Geol. Soc. Am. 2016;128(5-6):807-823.
http://dx.doi.org/10.1130/B31303.1