Publication: Estimación de la resistencia de la litosfera en la península ibérica
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Publication Date
2016
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Sociedad Geológica de España.
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Abstract
Como indicador de la resistencia de la litosfera a largo plazo, el espesor elástico efectivo (Te) se puede utilizar para entender la relación entre la reología de la litosfera y la evolución geodinámica de ambientes tectónicos complejos. En este trabajo presentamos, por primera vez, un mapa de alta resolución de la variación espacial de Te en la península ibérica, obtenido a partir del análisis espectral de la coherencia entre la topografía y anomalía de Bouguer, con el objetivo de mejorar nuestro conocimiento de la variación regional en la reología y el comportamiento mecánico a largo plazo de su litosfera. La mayor parte de la región se caracteriza por valores de espesor elástico efectivo bajos (Te < 20 km), destacando un domino de valores de Te moderados y altos en la zona centro y sudoeste peninsular, que se prolonga hacia el norte de África, limitado por fuertes gradientes de Te, especialmente en la zona sur.
As a proxy for long-term lithospheric strength, the effective elastic thickness (Te) can be used to understand the relationship between lithospheric rheology and geodynamic evolution of complex tectonic settings. Here we investigate the lithospheric strength of the Iberian Peninsula in order to improve our knowledge of the regional variations of the rheology and long-term mechanical behavior of the lithosphere in the study area. For this we present, for the first time, a high-resolution map of spatial variations of Te in the Iberian Peninsula from the spectral analysis of the Bouguer coherence. We find that this region is characterized by low Te values (Te < 20 km), where the most noticeable feature is a band of moderate to high values over the central and southwestern Iberian Peninsula, which connect southward with the high Te values in the North Africa region.
As a proxy for long-term lithospheric strength, the effective elastic thickness (Te) can be used to understand the relationship between lithospheric rheology and geodynamic evolution of complex tectonic settings. Here we investigate the lithospheric strength of the Iberian Peninsula in order to improve our knowledge of the regional variations of the rheology and long-term mechanical behavior of the lithosphere in the study area. For this we present, for the first time, a high-resolution map of spatial variations of Te in the Iberian Peninsula from the spectral analysis of the Bouguer coherence. We find that this region is characterized by low Te values (Te < 20 km), where the most noticeable feature is a band of moderate to high values over the central and southwestern Iberian Peninsula, which connect southward with the high Te values in the North Africa region.