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Mantle-lithosphere bodies in the Alboran crustal domain (Ronda peridotites, Betic-Rif orogenic belt) |
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| Authors: | M Torn E Banda V García-DuenÜas JC Balany |
| Institution: | aInstitute of Earth Sciences (Jaume Almera), CSIC, Martíi Franquès s/n, 08028 Barcelona ,Spain bDepartamento de Geodinámica—IAGM, CSIC—Universidad de Granada, 18071 Granada ,Spain |
| Abstract: | Geological and geophysical data are used to demonstrate the existence of intracrustal high-density/high P-wave velocity bodies in the western Betics. These bodies appear to correspond to buried peridotites similar to those that outcrop in the Ronda area. A gravity study shows how the gravity field is mainly the result of a combined effect of crustal thinning and the presence of ultramafic bodies. The size of the buried high-density body, as interpreted from gravity and seismic results, shows maximum dimensions of about 40 km in length (NNW-SSE), about 8 km in thickness, and a lateral extension (ENE-WSW) of about 70 km. The thinning of the crust from 32–35 km to 20–22 km takes place in a narrow area less than 35 km wide. Our results are compatible with an interpretation in terms of an unrooted peridotite slab. Dismembering of an initial slab of ultramafic rocks is a possible consequence of the extensional regime that originated the Alboran basin. |
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