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Esteban, F.; Tassone, A.; Menichetti, M.; Rapalini, A.E.; Remesal, M.B.; Cerredo, M.E.; Lippai, H.; Vilas, J.F. "Magnetic fabric and microstructures across the Andes of Tierra del Fuego, Argentina " (2011) Andean Geology. 38(1):64-81
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Abstract:

An anisotropy of magnetic susceptibility (AMS) transect was carried out across the Fuegian Andes, in Argentina, with the aim of studying its tectonic evolution. Two-hundred and forty oriented samples were collected from 27 sites distributed between the Paso Garibaldi to the north and the Canal Beagle to the south. The study was restricted to the Upper Jurassic Lemaire Formation, with a single site located in the Lower Cretaceous Yahgán Formation. Studied rocks comprised basaltic, andesitic, volcaniclastic and sedimentary rocks affected by low-grade metamorphism. AMS measurements were complemented with thin section analyses of representative samples in order to characterize the microstructures and metamorphic assemblages. In general, the magnetic fabric shows dominant oblate shapes and a large variation in the anisotropy degree from 1.04 up to 2. The anomalously high values were observed to be associated to growth of secondary pyrrhotite, which was identified by rock magnetic tests. Magnetic foliation was generally consistent with slaty cleaveage as observed in the field, confirming the tectonic origin of the magnetic fabric. Three geographic domains were distinguished in the study region on the basis of the pattern of the AMS axes distribution. In the northern domain, from Paso Garibaldi to Valle Carbajal, the orientation of the maximum susceptibility axis (k1), or magnetic lineation, is N-S to NE-SW with moderate plunge towards the S-SW and coincides with previous determination of mineral lineations associated with the Andean deformation and very low grade metamorphism. The magnetic fabric pattern can be correlated with the main deformational phase responsible for the development of slaty cleavage (main Andean deformational phase) and the tectonic transport due to progression of the Fuegian fold and thrust belt in the Late Cretaceous. A different character is shown along the Valle Carbajal domain, where subvertical E-W magnetic foliation planes and roughly E-W to ESE-WNW subhorizontal magnetic lineations are more difficult to correlate with the main folding phase and suggest its relation to an E-W, possibly localized, strike-slip regime during the main deformational and metamorphic phase. The magnetic fabrics in the third domain, close to the Canal Beagle, displays a more heterogeneous character with both E-W and N-S striking foliations; in this case a population of subhorizontal E-W magnetic lineation (k1) suggests the existence of a significant component of strike-slip deformation.

Registro:

Documento: Artículo
Título:Magnetic fabric and microstructures across the Andes of Tierra del Fuego, Argentina
Autor:Esteban, F.; Tassone, A.; Menichetti, M.; Rapalini, A.E.; Remesal, M.B.; Cerredo, M.E.; Lippai, H.; Vilas, J.F.
Filiación:CONICET-INGEODAV, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Ciudad Autónoma de Buenos Aires, Argentina
Istituto di Scienze della Terra, Università di Urbino, Campus Scientífico Universitario, 61029 Urbino, Italy
CONICET-Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA Ciudad Autónoma de Buenos Aires, Argentina
Palabras clave:AMS; Andean tectonics; Argentina; Mesozoic; Microstructures; Tierra del Fuego; Cretaceous; deformation mechanism; fold and thrust belt; foliation; lineation; low grade metamorphism; magnetic anisotropy; magnetic property; microstructure; tectonic evolution; tectonic setting; Andes; Argentina; Tierra del Fuego [(PRV) Argentina]
Año:2011
Volumen:38
Número:1
Página de inicio:64
Página de fin:81
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n1_p64_Esteban

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Citas:

---------- APA ----------
Esteban, F., Tassone, A., Menichetti, M., Rapalini, A.E., Remesal, M.B., Cerredo, M.E., Lippai, H.,..., Vilas, J.F. (2011) . Magnetic fabric and microstructures across the Andes of Tierra del Fuego, Argentina . Andean Geology, 38(1), 64-81.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n1_p64_Esteban [ ]
---------- CHICAGO ----------
Esteban, F., Tassone, A., Menichetti, M., Rapalini, A.E., Remesal, M.B., Cerredo, M.E., et al. "Magnetic fabric and microstructures across the Andes of Tierra del Fuego, Argentina " . Andean Geology 38, no. 1 (2011) : 64-81.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n1_p64_Esteban [ ]
---------- MLA ----------
Esteban, F., Tassone, A., Menichetti, M., Rapalini, A.E., Remesal, M.B., Cerredo, M.E., et al. "Magnetic fabric and microstructures across the Andes of Tierra del Fuego, Argentina " . Andean Geology, vol. 38, no. 1, 2011, pp. 64-81.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n1_p64_Esteban [ ]
---------- VANCOUVER ----------
Esteban, F., Tassone, A., Menichetti, M., Rapalini, A.E., Remesal, M.B., Cerredo, M.E., et al. Magnetic fabric and microstructures across the Andes of Tierra del Fuego, Argentina . Andean Geol. 2011;38(1):64-81.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v38_n1_p64_Esteban [ ]