Al-Aidaroos, A. M.

Augustin, Nico

Bantan, R.

Metz, Dirk

van der Zwan, Froukje M.

English

OceanRep

Geophysical Research AbstractsVol. 15, EGU2013-10487, 2013EGU General Assembly 2013© Author(s) 2013. CC Attribution 3.0 License.Mabahiss Mons, 25.5◦N Red Sea Rift: Tectonics and Volcanism of a LargeSubmarine Dome VolcanoDirk Metz (1), Nico Augustin (1), Froukje M. van der Zwan (1), Rashad A. Bantan (2), and Ali M. Al-Aidaroos(2)(1) GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany (dmetz@geomar.de), (2) King Abdulaziz University,Jeddah, Saudi ArabiaOnly little is known on the geological context of the Mabahiss Deep, located in the northern Red Sea at 25◦29′N,36◦04′E. In comparison to the central Red Sea, the flat-bottomed morphology of this deep does not depictorganized seafloor spreading (Martinez & Cochran 1988). Previous low resolution bathymetric (>100 m grid cellsize) and crude geophysical data were unable to give detailed account on the transition from the central towardsthe northern Red Sea Rift and the role of the Mabahiss Deep therein.New high resolution bathymetric datasets of this region, collected during R/V Pelagia cruise 64PE351 inApril 2012, reveal numerous details of the volcanism, tectonics and related sedimentary features in and aroundthe Mabahiss Deep with focus on an unusually large, Venusian-type pancake dome volcano (first described byGuennoc et al. 1988). The main volcanic building, the Mabahiss Mons volcano, is about 8 km in diameter andrises to an average height of 450 m above the surrounding seafloor. Mabahiss Mons hosts a 2000 m in diameterand 50 m deep caldera. Satellite volcanoes and small volcanic cones are scattered around the main edifice andtowards the SE. Multibeam backscatter data suggest recent eruptive activities at the flanks and within the caldera.In our first results of tectonic, volcanic and petrological investigations in the vicinity of Mabahiss Monsvolcano, based on high-resolution bathymetry, backscatter data and ground truthing, we present terrain analyses,preliminary geochemical data and petrological observations from MOR-basalts. The newly collected data willhelp to unravel the role of the Mabahiss Deep in the geological setting of the Red Sea and the changeover fromthe central to the northern Red Sea Rift.References:Guennoc, P., Pautot, G., & Coutelle, A. (1988). Surficial structures of the northern Red Sea axial valley from 23◦ Nto 28◦N: time and space evolution of neo-oceanic structures. Tectonophysics, 153(1-4), 1–23. doi:10.1016/0040-1951(88)90005-4Martinez, F., Cochran, J. R. (1988). Structure and tectonics of the northern Red Sea: catching a continental marginbetween rifting and drifting. Tectonophysics, 150(1), 1–31.

Mabahiss Mons, 25.5°N Red Sea Rift: Tectonics and Volcanism of a Large Submarine Dome Volcano

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