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Coutand, I.; Diraison, M.; Cobbold, P.R.; Gapais, D.; Rossello, E.A.; Miller, M. "Structure and kinematics of a foothills transect, Lago Viedma, southern Andes (49°30'S)" (1999) Journal of South American Earth Sciences. 12(1):1-15
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Abstract:

The western edge of Patagonia, south of 47°S, experienced a major tectonic reorganization during the Tertiary. The Chile ridge, separating Nazca from Antarctica, collided obliquely with western Tierra del Fuego at about 14 Ma and the triple point migrated northwards to its present position at about 47°S. Consequently, the southern tip of South America has passed from a Miocene context of rapid oblique convergence (ENE-WSW at about 9 cm/yr) between Nazca and South America, to a Pliocene context of slow frontal convergence (EW at about 2 cm/yr) between Antarctica and South America. The Andean foreland fold-and-thrust belt lies on the eastern side of the Patagonian Cordillera and is well exposed along the northern shore of Lago Viedma (49°30'S). Structural observations, digital mapping, subsurface data, balancing of a cross-section and kinematic analysis of fault populations provide new information on the structure of the fold-and-thrust belt, the timing and style of deformation and their relationship with Tertiary plate tectonics. Along the studied transect, synsedimentary structures show that compressional deformation began at least during the Late Cretaceous, was ongoing during the syntectonic emplacement of the Lower Miocene granitic Monte Fitz Roy pluton and continued into the Pliocene. Folds and thrusts are thick-skinned in the west, and mostly thin-skinned above a decollement in Early Cretaceous black shales in the east. Analysis of fault populations, measured within Jurassic basement and its Cretaceous cover, provides subhorizontal principal directions of shortening, striking between E-W and ENE-WSW. Compressional deformation was associated with a major component of right-lateral wrenching parallel to the Cordillera.

Registro:

Documento: Artículo
Título:Structure and kinematics of a foothills transect, Lago Viedma, southern Andes (49°30'S)
Autor:Coutand, I.; Diraison, M.; Cobbold, P.R.; Gapais, D.; Rossello, E.A.; Miller, M.
Filiación:Geosci.-Rennes (UPR 4661 - CNRS), Université de Rennes I, 35042, Rennes Cedex, France
CONICET and Univ. de Buenos Aires, Depto. Cie. Geologicas, Pabellon I., Buenos Aires, Argentina
Cia. General de Combustibles S.A., Alicia Moreau Justo N., Buenos Aires, Argentina
Palabras clave:collision zone; convergent margin; kinematics; structural geology; tectonic setting; Tertiary; Patagonia; South America
Año:1999
Volumen:12
Número:1
Página de inicio:1
Página de fin:15
DOI: http://dx.doi.org/10.1016/S0895-9811(99)00002-4
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v12_n1_p1_Coutand

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Citas:

---------- APA ----------
Coutand, I., Diraison, M., Cobbold, P.R., Gapais, D., Rossello, E.A. & Miller, M. (1999) . Structure and kinematics of a foothills transect, Lago Viedma, southern Andes (49°30'S). Journal of South American Earth Sciences, 12(1), 1-15.
http://dx.doi.org/10.1016/S0895-9811(99)00002-4
---------- CHICAGO ----------
Coutand, I., Diraison, M., Cobbold, P.R., Gapais, D., Rossello, E.A., Miller, M. "Structure and kinematics of a foothills transect, Lago Viedma, southern Andes (49°30'S)" . Journal of South American Earth Sciences 12, no. 1 (1999) : 1-15.
http://dx.doi.org/10.1016/S0895-9811(99)00002-4
---------- MLA ----------
Coutand, I., Diraison, M., Cobbold, P.R., Gapais, D., Rossello, E.A., Miller, M. "Structure and kinematics of a foothills transect, Lago Viedma, southern Andes (49°30'S)" . Journal of South American Earth Sciences, vol. 12, no. 1, 1999, pp. 1-15.
http://dx.doi.org/10.1016/S0895-9811(99)00002-4
---------- VANCOUVER ----------
Coutand, I., Diraison, M., Cobbold, P.R., Gapais, D., Rossello, E.A., Miller, M. Structure and kinematics of a foothills transect, Lago Viedma, southern Andes (49°30'S). J. South Am. Earth Sci. 1999;12(1):1-15.
http://dx.doi.org/10.1016/S0895-9811(99)00002-4