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Abstract:

The southernmost segment of the Andean Cordillera underwent a complex deformation history characterized by alternation of contractional, extensional, and strike-slip tectonics. Key elements of southern Andean deformation that remain poorly constrained, include the origin of the orogenic bend known as the Patagonian Orocline (here renamed as Patagonian Arc), and the exhumation mechanism of an upper amphibolite facies metamorphic complex currently exposed in Cordillera Darwin. Here, we present results of anisotropy of magnetic susceptibility (AMS) from 22 sites in Upper Cretaceous to upper Eocene sedimentary rocks within the internal structural domain of the Magallanes fold-and-thrust belt in Tierra del Fuego (Argentina). AMS parameters from most sites reveal a weak tectonic overprint of the original magnetic fabric, which was likely acquired upon layer-parallel shortening soon after sedimentation. Magnetic lineation from 17 sites is interpreted to have formed during compressive tectonic phases associated to a continuous. ~. N-S contraction. Our data, combined with the existing AMS database from adjacent areas, show that the Early Cretaceous-late Oligocene tectonic phases in the Southern Andes yielded continuous contraction, variable from. ~. E-W in the Patagonian Andes to. ~. N-S in the Fuegian Andes, which defined a radial strain field. A direct implication is that the exhumation of the Cordillera Darwin metamorphic complex occurred under compressive, rather than extensional or strike-slip tectonics, as alternatively proposed. If we agree with recent works considering the curved Magallanes fold-and-thrust belt as a primary arc (i.e., no relative vertical-axis rotation of the limbs occurs during its formation), then other mechanisms different from oroclinal bending should be invoked to explain the documented radial strain field. We tentatively propose a kinematic model in which reactivation of variably oriented Jurassic faults at the South American continental margin controlled the Late Cretaceous to Cenozoic evolution of the Magallanes fold-and-thrust belt, yielding the observed deformation pattern. © 2015 Elsevier B.V..

Registro:

Documento: Artículo
Título:Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility
Autor:Maffione, M.; Hernandez-Moreno, C.; Ghiglione, M.C.; Speranza, F.; van Hinsbergen, D.J.J.; Lodolo, E.
Filiación:Department of Earth Sciences, Utrecht University, Utrecht, Netherlands
Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Instituto de Estudios Andinos Don Pablo Groeber, Universidad de Buenos Aires-CONICET, Argentina
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Trieste, Italy
Palabras clave:Anisotropy of magnetic susceptibility; Cordillera Darwin; Patagonian Orocline; Southern Andes; Tectonics; Anisotropy; Bending (deformation); Deformation; Kinematics; Magnetic anisotropy; Magnetic susceptibility; Magnetism; Sedimentary rocks; Strike-slip faults; Structural geology; Anisotropy of magnetic susceptibility; Cordillera Darwin; Fold-and-thrust belts; Layer parallel shortenings; Orocline; Southern Andes; Strike-slip tectonics; Vertical-axis rotation; Tectonics; amphibolite facies; continental margin; Cretaceous; deformation mechanism; exhumation; fold and thrust belt; magnetic anisotropy; magnetic fabric; paleomagnetism; strike-slip fault; tectonic evolution; tectonic setting; Andes; Argentina; Chile; Cordillera Darwin; Magallanes; Tierra del Fuego [(PRV) Argentina]
Año:2015
Volumen:665
Página de inicio:236
Página de fin:250
DOI: http://dx.doi.org/10.1016/j.tecto.2015.10.008
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v665_n_p236_Maffione

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Citas:

---------- APA ----------
Maffione, M., Hernandez-Moreno, C., Ghiglione, M.C., Speranza, F., van Hinsbergen, D.J.J. & Lodolo, E. (2015) . Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility. Tectonophysics, 665, 236-250.
http://dx.doi.org/10.1016/j.tecto.2015.10.008
---------- CHICAGO ----------
Maffione, M., Hernandez-Moreno, C., Ghiglione, M.C., Speranza, F., van Hinsbergen, D.J.J., Lodolo, E. "Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility" . Tectonophysics 665 (2015) : 236-250.
http://dx.doi.org/10.1016/j.tecto.2015.10.008
---------- MLA ----------
Maffione, M., Hernandez-Moreno, C., Ghiglione, M.C., Speranza, F., van Hinsbergen, D.J.J., Lodolo, E. "Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility" . Tectonophysics, vol. 665, 2015, pp. 236-250.
http://dx.doi.org/10.1016/j.tecto.2015.10.008
---------- VANCOUVER ----------
Maffione, M., Hernandez-Moreno, C., Ghiglione, M.C., Speranza, F., van Hinsbergen, D.J.J., Lodolo, E. Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility. Tectonophysics. 2015;665:236-250.
http://dx.doi.org/10.1016/j.tecto.2015.10.008