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Abstract:

The widespread Sanrafaelic remagnetization reset most of the early Cambrian to mid-Ordovician carbonate platform of the Argentine Precordillera and the calcareous units of the San Rafael Block. We conducted a detailed rock-magnetic study on the Middle-Ordovician limestones of the Ponón Trehué Formation at both limbs of a tight anticline exposed in the San Rafael Block (Mendoza province, central-western Argentina) that are carriers of a syntectonic magnetization of Permian age. We found that the magnetic overprint in the Ponón Trehué Formation is carried by both pyrrhotite and magnetite, with goethite and subordinate haematite likely related to weathering. Hysteresis parameters, frequency dependence of magnetic susceptibility, Cisowski and modified Lowrie-Fuller tests suggest the presence of ultrafine particles of chemical origin. Demagnetization of natural remanent magnetization and of three-axis isothermal remanence confirm pyrrhotite and magnetite as important contributors to the remanence. Both minerals carry the same magnetic syntectonic component suggesting a coeval or nearly coeval remanence acquisition and therefore mineral formation. This and the results of the magnetic fabric analyses indicate an authigenic origin of the magnetic minerals during folding associated with the Sanrafaelic tectonic phase (ca. 280 Ma). Although the chemically active (oxidizing?) fluids expelled from the orogen as it developed in the early Permian is a viable explanation for the Sanrafaelic remagnetization, the role of the nearly coeval magmatism in Precordillera and the San Rafael Block remains to be properly evaluated. © 2016 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Magnetic properties of the remagnetized Middle-Ordovician limestones of the Ponón Trehué Formation (San Rafael Block, central-western Argentina): Insights into the Permian widespread Sanrafaelic overprint
Autor:Fazzito, S.Y.; Rapalini, A.E.
Filiación:Laboratorio de Paleomagnetismo Daniel A. Valencio, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Intendente Güiraldes 2160, Pabellón II, Buenos Aires, C1428EGA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
Palabras clave:Cuyania; Magnetic fabrics; Magnetic properties; Mendoza province; Remagnetized carbonates; San Rafael Block; Sanrafaelic remagnetization; carbonate platform; demagnetization; limestone; magnetic fabric; magnetic property; magnetostratigraphy; Ordovician; Permian; remagnetization; Argentina; Mendoza; San Rafael Massif
Año:2016
Volumen:70
Página de inicio:279
Página de fin:297
DOI: http://dx.doi.org/10.1016/j.jsames.2016.05.012
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_v70_n_p279_Fazzito

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Citas:

---------- APA ----------
Fazzito, S.Y. & Rapalini, A.E. (2016) . Magnetic properties of the remagnetized Middle-Ordovician limestones of the Ponón Trehué Formation (San Rafael Block, central-western Argentina): Insights into the Permian widespread Sanrafaelic overprint. Journal of South American Earth Sciences, 70, 279-297.
http://dx.doi.org/10.1016/j.jsames.2016.05.012
---------- CHICAGO ----------
Fazzito, S.Y., Rapalini, A.E. "Magnetic properties of the remagnetized Middle-Ordovician limestones of the Ponón Trehué Formation (San Rafael Block, central-western Argentina): Insights into the Permian widespread Sanrafaelic overprint" . Journal of South American Earth Sciences 70 (2016) : 279-297.
http://dx.doi.org/10.1016/j.jsames.2016.05.012
---------- MLA ----------
Fazzito, S.Y., Rapalini, A.E. "Magnetic properties of the remagnetized Middle-Ordovician limestones of the Ponón Trehué Formation (San Rafael Block, central-western Argentina): Insights into the Permian widespread Sanrafaelic overprint" . Journal of South American Earth Sciences, vol. 70, 2016, pp. 279-297.
http://dx.doi.org/10.1016/j.jsames.2016.05.012
---------- VANCOUVER ----------
Fazzito, S.Y., Rapalini, A.E. Magnetic properties of the remagnetized Middle-Ordovician limestones of the Ponón Trehué Formation (San Rafael Block, central-western Argentina): Insights into the Permian widespread Sanrafaelic overprint. J. South Am. Earth Sci. 2016;70:279-297.
http://dx.doi.org/10.1016/j.jsames.2016.05.012