Palaeomagnetic rotations in the eastern Betic Cordillera, southern Spain

Details Palaeomagnetic rotations in the eastern Betic Cordillera, southern Spain Palaeomagnetic rotations in the eastern Betic Cordillera, southern Spain

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.119..225a&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 119, no. 3, p. 225-241

Computer Science

25

Earth (Planet), Geomagnetism, Paleomagnetism, Planetary Evolution, Rotational States, Tectonics, Carbonates, Limestone, Sediments, Spain

Scientific paper

Paalaeomagnetic declinations from the External Zones of the eastern Betic Cordillera (southern Spain) and an adjacent area of the Internal Zone indicate variable and locally very large clockwise rotations. The rotations occurred after latest Oligocene times, and probably before the late Miocene. This overlaps a period of dextrally oblique convergence during the early to middle Miocene along the Internal/External Zone Boundary and within the External Zone. Rotations in the External Zone are recorded by palaeomagnetic results from 27 sites in Upper Jurassic (Ammonitico rosso facies) limestones from the Subbetic Zone, and one site of a similar age from the Prebetic. Palaeomagnetic declinations from individual tectonic blocks in the Subbetic are consistent, but indicate large differential rotations between blocks. These blocks are underlain by low-angle thrust faults, which probably accomodated much of the rotation. The largest rotations occur on relatively small isolated blocks of Jurassic carbonates in a highly deformed Triassic evaporite sequence. In Malaguide rocks of the Sierra Espuna in the adjacent Internal Zone, stable palaeomagnetic components were measured at one site in upper Miocene sedimentary rocks, at three sites in upper Oligocene - lower Miocene red marls, at one site in Oligocene marls, at one site in Jurassic limestones, and at two sites in Permo-Triassic red beds. The palaeomagnetic results suggest that about 60 deg of clockwise rotation occurred in the latest Oligocene-earliest Miocene, and a further 140 deg of clockwise rotation subsequently. One site in late Miocene sedimentary rocks yields unrotated declinations which, if not representing an overprinted direction, indicate that the rotation was complete by the end of the Miocene.

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