Examinando por Autor "Ruiz, Francisco"

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    ÍtemAcceso Abierto
    A plastic rheology phenomenological 201 . model that explains the Andes evolution in northern Argentina
    (Instituto de Fisiografía y Geología. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosario, 27/12/2012) Introcaso, Antonio; Giménez, Mario; Martínez, María Patricia; Ruiz, Francisco
    A plastic rheology, partially phenomenological model is presented to explain the isostatically compensated Andean relief formation. This model considers a combination of lithospheric heating with long period relaxation and successive crustal shortenings on a north section of Argentina located at 24°S latitude. The present size of the Andean root –related to the Andes construction– was obtained by inverting regionalized Bouguer anomalies, also consistent with geoid undulations. The relief of 1520 km is balanced both with a thermal root of 70.63 km located at the lithospheric mantle and 2 with an evolutionary crustal root originated by shortenings. A pretended contradiction must be noted: lateral compressive shortenings and side moving tending to squash and to widen the high relief. For better understanding the problem, a linear model is first presented. Then, a nonlinear model of plastic rheology is considered with a stability coefficient depending on width and elevation. We have assumed that isostatic balance keeps on the whole orogenic construction. We also impose an empirical stability relationship. If this relationship does not hold, there will be an extra relief and therefore an extra root that will plastically flow until reaching stability.
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    ÍtemAcceso Abierto
    Anuario 2017 Centro de Estudios de Historia Constitucional Argentina
    (Grafica Amalevi, 2017-12-01) Yurman, Pablo; Batalla, Leandro; Bollero, Gabriela; Bukovac, Carlos; Ruiz, Francisco; larrea, alejandra; marquardt, maria javiera
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    ÍtemAcceso Abierto
    Study of the Claromecó Basin from gravity, magnetic and geoid undulation charts
    (Instituto de Fisiografía y Geología. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosario, 2011-07-01) Ruiz, Francisco; Introcaso, Antonio
    In this work we analyze crustal characteristics of Claromeco intermontane basin using gravity and magnetic anomalies, and local geoid undulations. They are: i) isostatic compensation (based on Airy hypothesis), related to stretching; ii) old sediments filling the basin, covering more than 12 km, with a density contrast value of -100 kg m (super -3) , resulting to be well balanced by an antiroot filled with upper mantle materials. A crustal model is proposed justifying both observed Bouguer anomalies and local geoid undulations. A chart of isobath contours is built using a quadratic equation involving sediments' thickness and local geoid undulation. Magnetic basement depth Z T and Curie point depth Z B are obtained using spectral analysis on a total field magnetic anomaly chart. Results show that Z T reaches a maximum value of 12 km, whereas Z B attains a minimum value below the Claromeco basin. The basin puts aside two different depth domains of the Curie isothermal surface: at the southwestern zone of the Ventania ranges Z B is about 25 km, while northeast of these mountains Z B is about 30 km.