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Sea floor morphology and Plio-Quaternary sedimentary cover of the Mallorca Channel, Balearic Islands, western Mediterranean

Acosta, Juan and Canals, Miquel and Carbó Gorosabel, Andrés and Muñoz, Araceli and Urgeles, R. and Muñoz Martín, Alfonso and Uchupi, E. (2004) Sea floor morphology and Plio-Quaternary sedimentary cover of the Mallorca Channel, Balearic Islands, western Mediterranean. Marine Geology, 206 . pp. 165-179. ISSN 0025-3227

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Abstract

A complete multibeam coverage of the sea floor of Mallorca Channel, in the western Mediterranean, was recorded during
the Spanish Exclusive Economic Zone surveys in 1995, 1996 and 1997. These data, combined with previous high-resolution
seismic reflection profiles, allow an assessment of the geomorphology of the area. The channel seafloor is disrupted by a fault
complex and pockmarks. Motion along the faults split the sea floor into a series of undulations separated by narrow V-shaped
notches. Faulting may be a consequence of recent seaward gravitational sliding that occurred along a soft surface at the top of a
late Messinian–early Pliocene unit and a late Messinian evaporite. These units have been tilted during recent subsidence of the
Mallorca Channel at the same time that the insular shelf was uplifted along a fault at the shelf’s edge. The set of pockmarks in
the channel sequence were probably formed by the expulsion of gas of hydrothermal origin, and expulsion may have been
enhanced by the faulting. This gas seepage could be an additional factor leading to sediment instability.


Item Type:Article
Uncontrolled Keywords:Balearic Islands; Geohazards; Landslides; Raft tectonics; Pockmarks
Subjects:Sciences > Geology > Geodynamics
ID Code:5964
Deposited On:21 Nov 2006
Last Modified:06 Feb 2014 07:46

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