Abstract:
The Nazca Plate subducting beneath the South American Plate has strongly influenced Cenozoic mountain growth in western Argentina and Chile sectors (32-34°S; 70-66°W). At these latitudes, the Pampean flat slab has induced the development of prominent mountain systems such as the Frontal Cordillera, the Precordillera, and the associated Sierras Pampeanas in the eastwards foreland region. Through a gravity study from the Frontal Cordillera to the Sierras Pampeanas region between 32 and 34°S, we delimit a series of geological structures that are accommodating shortening in the upper crust and others of regional and subsurface development, without any clearly defined mechanics of deformation. Additionally, through an isostatic residual anomaly map based on the Airy-Heiskanen local compensation model, we obtain a decompensative gravity anomaly map that highlights anomalous gravity sources emplaced in the upper crust, related to known geological structures. In particular, by applying the Tilt method which enhances the gravity anomalies, the NW-trending Tunuyan Lineament is depicted south of 33.4°S following previous proposals. Using the decompensative gravity anomaly, two profiles were modelled through the northern sector of the study area using deep seismic refraction lines, borehole data and geological information as constraints. These density models of the upper crust of this structurally complex area accurately represent basin geometries and basement topography and constitute a framework for future geological analysis. © 2015 The Geological Society of London.
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Documento: |
Artículo
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Título: | Geophysical characterization of the upper crust in the transitional zone between the Pampean flat slab and the normal subduction segment to the south (32-34°S): Andes of the Frontal Cordillera to the Sierras Pampeanas |
Autor: | Sánchez, M.; Lince Klinger, F.; Martinez, M.P.; Alvarez, O.; Ruiz, F.; Weidmann, C.; Folguera, A. |
Filiación: | CONICET. Instituto Geofísico y Sismológico Ing. Volponi, Universidad Nacional de San Juan, Ruta 2, km. 7, San Juan, CP 5407, Argentina Instituto Geofísico y Sismológico Ing. Volponi, Universidad Nacional de San Juan, Ruta 1, km. 17, San Juan, CP 5407, Argentina Department Cs. Geol. FCEN. U.B.A. Buenos Aires, Inst. Estudios Andinos Don Pablo Groeber, Argentina
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Palabras clave: | crustal shortening; deformation mechanism; foreland basin; Nazca plate; slab; subduction zone; topography; transition zone; upper crust; Andes; Argentina; Precordillera; Sierras Pampeanas |
Año: | 2015
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Volumen: | 399
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Página de inicio: | 167
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Página de fin: | 182
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DOI: |
http://dx.doi.org/10.1144/SP399.12 |
Título revista: | Geological Society Special Publication
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Título revista abreviado: | Geol. Soc. Spec. Publ.
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ISSN: | 03058719
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v399_n_p167_Sanchez |
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Citas:
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Sánchez, M., Lince Klinger, F., Martinez, M.P., Alvarez, O., Ruiz, F., Weidmann, C. & Folguera, A.
(2015)
. Geophysical characterization of the upper crust in the transitional zone between the Pampean flat slab and the normal subduction segment to the south (32-34°S): Andes of the Frontal Cordillera to the Sierras Pampeanas. Geological Society Special Publication, 399, 167-182.
http://dx.doi.org/10.1144/SP399.12---------- CHICAGO ----------
Sánchez, M., Lince Klinger, F., Martinez, M.P., Alvarez, O., Ruiz, F., Weidmann, C., et al.
"Geophysical characterization of the upper crust in the transitional zone between the Pampean flat slab and the normal subduction segment to the south (32-34°S): Andes of the Frontal Cordillera to the Sierras Pampeanas"
. Geological Society Special Publication 399
(2015) : 167-182.
http://dx.doi.org/10.1144/SP399.12---------- MLA ----------
Sánchez, M., Lince Klinger, F., Martinez, M.P., Alvarez, O., Ruiz, F., Weidmann, C., et al.
"Geophysical characterization of the upper crust in the transitional zone between the Pampean flat slab and the normal subduction segment to the south (32-34°S): Andes of the Frontal Cordillera to the Sierras Pampeanas"
. Geological Society Special Publication, vol. 399, 2015, pp. 167-182.
http://dx.doi.org/10.1144/SP399.12---------- VANCOUVER ----------
Sánchez, M., Lince Klinger, F., Martinez, M.P., Alvarez, O., Ruiz, F., Weidmann, C., et al. Geophysical characterization of the upper crust in the transitional zone between the Pampean flat slab and the normal subduction segment to the south (32-34°S): Andes of the Frontal Cordillera to the Sierras Pampeanas. Geol. Soc. Spec. Publ. 2015;399:167-182.
http://dx.doi.org/10.1144/SP399.12