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Mass Movement Deposits and Tectonics relation as a main factor to control the stratigraphical architecture of the South Alboran Basin (Alboran Sea, Western Mediterranean)

AuthorsVázquez, J. T.; Alonso, Belén ; Ercilla, Gemma ; Juan, Carmen ; Estrada, Ferran ; García, Marga
South Alboran Basin
Mass-movement deposit
Issue Date24-Sep-2013
CitationV RCANS Congress Abstract Book: 46-47 (2013)
AbstractCompression between the Eurasian and Nubian plates has driven the Post-Messinian tectonics of Betic-Rif orogen and has controlled the physiography of the Alboran Basin. Initial Miocene basin was narrowed by uplifted margins (up to 1000 m), which nowadays are part of the Betic-Rif ranges. The current geomorphology of the Alboran basin shows evidences of this tectonics: tilting of margins and formation of sub-basins and highs. The major submarine reliefs include two marginal platforms developed in relation to several seamounts; the Alboran Ridge, a NE-SW elongated seamount, up to 200 km length and up to 1500 m in relief, which has a tectonic and volcanic origin; and three main basins: Western, Eastern and Southern Alboran Basin (SAB). The aim of this study is the tectonicsedimentary relations which have controlled the stratigraphic architecture of the SAB, especially the occurrence of Mass Movement Deposits (MMDs). The SAB is located on the southern margin of the Alboran Sea, and its formation is controlled by the uplifting of the Alboran Ridge in the northwest and the Tres Forcas Promontory – West Cabliers Banks alineation in the southeast. The SAB shows a narrow (15 to 30 km in width) and elongated (up to 100 km in length) geometry in a NE-SW trend. Its northwestern flank (south facing of the Alboran Ridge) shows up to 1100 m in height and a steep and lineal slope (5 to 35º).in the southeast, the Tres Forcas Promontory shows up to 860 m in height and a smooth slope (1.5 to 2.7º) related to plastered contouritic deposits; and in the West, the Cabliers Bank is up to 740 m in height showing an irregular slope (up to 10º). Seismic stratigraphy analysis of airgun high-resolution profiles, calibrated with ODP Site 979, reveals the SAB has been filled since Miocene times, showing the major sedimentation during the Pliocene and Quaternary, when the main tectonic uplift of their borders occurs. An angular unconformity, intra Pliocene in age, defines a break in the Alboran Ridge uplift however continued along Quaternary. The basin infill is controlled during these times by the interplay between countouritic and mass movement processes whose onset and occurrence is governed by the tectonics generated reliefs. At least seven main MMDs have been recognized by their transparent to chaotic seismic facies from Lower Pliocene to Quaternary times. Their number and distribution varies during the Pliocene-Quaternary through the basin, but two major sedimentary instability episodes occurred during the Lower Pliocene (3 MMDs with a recurrence of 0.56 My) and the Middle Pleistocene to present (4 MMDs with a recurrence of 0.225 My). These two episodes could be correspond to the Lower Pliocene main uplift of SAB borders and the Quaternary reactivation of tectonics structures
DescriptionVázquez, J. T. ... et al.-- V Regional Committee on Atlantic Neogene Stratigraphy (RCANS) Congress: Two decades of Atlantic Neogene study, 24-26 September 2013, Huelva
Publisher version (URL)http://uhu.es/RCANS_Huelva/index.php?url=welcome
Identifiersisbn: 978-84-695-8480-4
Appears in Collections:(IACT) Libros y partes de libros
(ICM) Libros y partes de libros
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