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Estructura profunda del Zagros y de la meseta de Irán: modelo geofísico y petrológico/Deep structure across the Zagros Mountains and the Iranian Plateau. An integrated geophysical and petrological approach

Tunini, L ; Jiménez-Munt, I ; Fernández, M

Física de la tierra, 2011-01, Vol.23, p.93 [Periódico revisado por pares]

Madrid: Universidad Complutense de Madrid

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  • Título:
    Estructura profunda del Zagros y de la meseta de Irán: modelo geofísico y petrológico/Deep structure across the Zagros Mountains and the Iranian Plateau. An integrated geophysical and petrological approach
  • Autor: Tunini, L ; Jiménez-Munt, I ; Fernández, M
  • Assuntos: Geophysics ; Lithosphere ; Petrology
  • É parte de: Física de la tierra, 2011-01, Vol.23, p.93
  • Descrição: The Zagros, mountains which cross Iran from NW to SE, were formed by the collision between the Arabian and Eurasian plates during the Cenozoic. A low seismic velocities anomaly (Maggi & Priestley, 2005; Alinaghi et al., 2007) and the integrated fitting of elevation, potential fields and thermal data (Molinaro et al., 2005), suggest a thinning in the upper mantle below the orogen. Using a method (Afonso et al., 2008) which combines elevation, geoid, gravity, superficial heat flow, seismic and petrological data, we investigate the mantle structure down to 400 km depth of a profile which crosses the westernmost part of the Zagros Mountains, passes the Alborz and reaches the southern coast of the Caspian Sea. The result shows a significant deficit of mass in the lithospheric mantle beneath the Zagros and we solve that with thickness variation of the lithospheric mantle. The lithosphere-astenosphere boundary (LAB), which is almost 230 km deep below the Foreland Basin, goes up to 120 km depth below the Sinandaj Sirjan Zone. A mantle thinning affects the whole area below the Zagros and the Alborz Mountains and is characterized by a negative density anomaly and a higher temperature. It was necessary to use three different mantle compositions to reach the best fit of the data: a Proton-6 (Griffin et al., 2008) for the mantle below the Mesopotamian foreland; a Tecton Tc-2 (Griffin et al., 2008) for the mantle below the orogen, and a different composition derived from Sahneh ophiolite composition for the mantle below the Eurasian plate. [PUBLICATION ABSTRACT]
  • Editor: Madrid: Universidad Complutense de Madrid
  • Idioma: Espanhol
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