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handle: 20.500.14352/7058 , 10261/271503
[ES] Menorca se encuentra en el extremo noroeste del orógeno Bético entre regiones sometidas a extensión y condirección N-S a NE-S. La estructura de la isla, caracterizada a grandes rasgos por una elongación ONO-ESE a favor de fallas modernas de alto ángulo paralelas a la Zona de Fractura del Norte de Baleares (NBFZ), difiere de la de otras islas de su entorno y ha sido objeto de estudios recientes. En este trabajo analizamos tres fallas tardías que cruzan la isla longitudinalmente mediante el set de inversión de esfuerzos y su proyección cartográfica. Los resultados de la inversión de esfuerzos implican un movimiento lateral-izquierdo con componente normal para la falla de Tramuntana, con R = 0,7 y σ1 horizontal, y un movimiento normal con componente direccional para las fallas de Mercadal y Binixems, con R= 0,8, σ1 vertical y σ2 horizontal; en ambos casos encontramos evidencias estructurales y/o cartográficas de deformación lateral-derecha. Estos resultados permiten explicar varias estructuras Alpinas de la isla, hasta ahora vagamente interpretadas, aunque son incompatibles con un funcionamiento exclusivamente lateral-derecho de la NBFZ.
[EN] Minorca is located at the easternmost sector of the Betic orogen between N-S to NE-SW extensional basins. The elongate WNW-ESE shape of the island follows the strike of late high-angle faults, which parallel the North Balearic Fracture Zone (NBFZ). The structure of Minorca differs from that of other nearby Mediterranean islands and has been the subject of recent studies. In this work we report the results of a fault population analysis (including its cartographical projection) applied to three late WNW-ESE faults that cross the island longitudinally. The stress inversion results show a left-lateral movement with normal component for the Tramuntana Fault, with R = 0,7 and horizontal σ1 and a normal movement with left-lateral component for the Mercadal and Binixems faults, with R = 0,8, vertical σ1 and horizontal σ2; in both cases there are structural and/or cartographical evidence of right-lateral deformation. These results explain several Alpine structures of the island, poorly interpreted up to now, but are unfitting for a solely right-lateral movementof NBFZ.
Trabajo presentado en el X Congreso Geológico de España, 5-7 julio 2021, Vitoria-Gasteiz
Peer reviewed
Western Mediterranean, Zona de Fractura del Norte de las Baleares, Orogenia alpina, Geodinámica, Mediterráneo occidental, 2507 Geofísica, Strike-slip deformation belt, 551.24(460.32), North Balearic Fracture Zone, Cinturón de deformación direccional, Mediterráneo Occidental, Alpine orogeny, Norh Balearic Fracture Zone, Zona de fractura del norte de las Baleares, Alpine Orogeny
Western Mediterranean, Zona de Fractura del Norte de las Baleares, Orogenia alpina, Geodinámica, Mediterráneo occidental, 2507 Geofísica, Strike-slip deformation belt, 551.24(460.32), North Balearic Fracture Zone, Cinturón de deformación direccional, Mediterráneo Occidental, Alpine orogeny, Norh Balearic Fracture Zone, Zona de fractura del norte de las Baleares, Alpine Orogeny
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