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Pliocene to Holocene structure of the Eastern Alboran Sea (Western Mediterranean)

AuthorsAlvarez-Marrón, Joaquina
Issue DateMar-1999
PublisherOcean Drilling Program
CitationProceedings of the Ocean Drilling Program - Scientific Results 161: 345-355 (1999)
AbstractSince the early Pliocene, the active tectonic setting of the Eastern Alboran Sea has been characterized by active strike-slip tectonism, causing the main bathymetric depressions to form in the eastern part of the Alboran Sea, the Eastern Alboran Basin, the Yusuf Basin, the Alboran Channel, and the South Alboran Basin. The Eastern Alboran Basin is a 2000-m-deep, mostly flat-bottomed, triangular-shaped graben developed between the Iberian and African continental margins. Ocean Drilling Program (ODP) Leg 161 data provide the time frame for the late Miocene to Holocene history of the basin. At Site 977, 600 m of Miocene(?)-Pliocene to Holocene marine sediments were drilled, and 700 m of upper Miocene to Pleistocene marine sediments at Site 978. Within the sedimentary package, several unconformities reveal the active strike-slip tectonism that occurred during this time.
At the southern border of the Eastern Alboran Basin the active, right lateral strike-slip Yusuf Fault is developing. Reflection seismic profiling shows that, at a right stepover of the Yusuf Fault, a developing negative flower structure is causing the Yusuf Basin to form, in which active tectonic subsidence has been ongoing since at least the late Miocene. Above the interpreted Messinian reflections, the sedimentary fill forms a northeastward-thickening wedge of syntectonic sediments of Pliocene to Holocene age.
In the South Alboran Basin, drilling at Site 979 penetrated Pliocene to Holocene syntectonic sediments, which form growth strata geometries related to a south-dipping monocline that evolved above a north-dipping thrust fault in the basement. North of the Alboran Ridge, a narrow strike-slip basin is forming in the Alboran Channel next to the strike-slip fault at the northern flank of the ridge.
Description11 pages, 12 figures.-- Published in: Zahn, R., Comas, M.C., and Klaus, A. (Eds), Proc. ODP, Sci. Results, 161, 345-355. College Station, TX (Ocean Drilling Program, USA).
Publisher version (URL)http://dx.doi.org/10.2973/odp.proc.sr.161.224.1999
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