The tributary valley systems of the Almeria Canyon (Alboran Sea, SW Mediterranean): Sedimentary architecture

García, Marga; Alonso, Belén; Ercilla, Gemma; Gràcia, Eulália

doi:10.1016/j.margeo.2005.10.002

Cited by 36 publications

(10 citation statements)

References 45 publications

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“…8G), displaying a V-shaped axis and limited by straight canyon walls. Such a succession of straight sections with different orientations is generally associated with fault control of the canyon geometry, as is the case of the Capbreton canyon (Gaudin et al, 2006), the Danube canyon (Popescu et al, 2004) or in the Dalias tributary valley system of the Almeria canyon (García et al, 2006). In our case, the fault would trend 350°and controls the central leg of the Z, as well as continuing up the southern wall.…”

Section: Canyon Location and Fault Controlmentioning

confidence: 72%

Geomorphology and sedimentary features in the Central Portuguese submarine canyons, Western Iberian margin

et al. 2009

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Section: Canyon Location and Fault Controlmentioning

confidence: 72%

Geomorphology and sedimentary features in the Central Portuguese submarine canyons, Western Iberian margin

et al. 2009

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“…2 and 9). The huge sediment discharge during the flash floods favours the formation of hyperpycnal plumes that cross the infralittoral area, scouring the seafloor (Mulder et al, 1995;García et al, 2006;Fernández-Salas et al, 2007). fig.…”

Section: Morphogenetic Significancementioning

confidence: 99%

The El Masnou infralittoral sedimentary environment (Barcelona province, NW Mediterranean Sea): morphology and Holocene seismic stratigraphy

Ercilla¹,

Estrada²,

Casas³

et al. 2009

Sci. Mar.

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SUMMARY: A detailed analysis of the morphology and the Holocene seismic and sequence stratigraphy and architecture of the infralittoral sedimentary environment of the El Masnou coast (Catalonia, NW Mediterranean Sea) was carried out using multibeam bathymetry and GeoPulse seismic data. This environment extends down to 26-30 m water depth, and is defined morphologically by two depositional wedges whose seafloor is affected by erosive furrows, slides, fields of large-and smallscale wavy bedforms, and dredging trenches and pits. Erosive terraces are also identified in the transition domain toward the inner continental shelf. The Holocene stratigraphy of the infralittoral environment is defined by two major seismic sequences (lower and upper), each one formed by internal seismic units. The sequences and units are characterised by downlapping surfaces made up of deposits formed by progradation of coastal lithosomes. The stratigraphy and stratal architecture, displaying a retrogradational arrangement with progradational patterns of minor order, were controlled by different sea-level positions. The stratigraphic division represents the coastal response to the last fourth-order transgressive and highstand conditions, modulated by small-scale sea-level oscillations (≈1-2 m) of fith to sixth order. This study also highlights the advantage of an integrated analysis using acoustic/seismic methods for practical assessment of the anthropogenic effects on infralittoral domains based on the association of marine geological observations. Keywords: infralittoral environment, morphology, stratigraphy, Holocene, El Masnou. RESUMEN: El ambiEntE sEdimEntario infralitoral dE El masnou (provincia dE barcElona, mEditErránEo no): morfología y Estratigrafía sísmica dEl HolocEno. -En este trabajo se presenta el estudio detallado de la morfología y la estratigrafía sísmica y secuencial del Holoceno que caracteriza al ambiente infralitoral de El Masnou y que ha sido llevado a cabo mediante datos obtenidos con sonda multihaz y perfiles de sísmica monocanal de alta resolución de GeoPulse. Este ambiente infralitoral se extiende hasta los 26-30 m de profundidad y está morfológicamente caracterizado por dos cuñas deposicionales cuyas superficies están afectadas por surcos erosivos, deslizamientos, campos de ondas de sedimento de pequeña y gran escala, y formas de origen antrópico (fosas y hoyos de dragado). También se identifican terrazas erosivas en el área de transición a la plataforma continental. La estratigrafía del Holoceno de este ambiente infralitoral está definida por dos secuencias sísmicas (inferior y superior), y cada una de ellas comprende internamente unidades sísmicas. El desarrollo de esta estratigrafía y de su arquitectura ha estado controlado por cambios del nivel del mar. Las divisiones estratigráficas definidas representan la respuesta costera al último estadio transgresivo y de alto nivel del mar de 4º orden, modulado por pequeñas oscilaciones (≈1-2 m) de nivel del mar de 5º y 6º orden. Por otra parte, el presente estudio mue...

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“…Technological advances over the last 25 years in acoustical sonar systems now allow the collection of bathymetric maps with spatial resolution comparable to terrestrial digital elevation models (DEMs) [ Fildani and Normark , 2004; Garcia et al , 2005]. Numerous bathymetric surveys of continental shelf and slope settings reveal dendritic channel networks [ Garcia et al , 2005; Puig et al , 2003] that are qualitatively similar to their terrestrial cousins. The primary mechanisms that initiate and drive the evolution of these channel networks are sediment gravity flows [ Heezen and Ewing , 1952], namely turbidity currents.…”

Section: Introductionmentioning

confidence: 99%

Channel network scaling laws in submarine basins

Straub

Jerolmack

Mohrig

et al. 2007

Geophysical Research Letters

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[1] Fluvial drainage basin area is often related to channel length and local slope through power law relationships and the relatively small range of exponents observed in these relationships is thought to result from physical mechanisms. Proposed mechanisms assume that the observed correlation between drainage area and fluid discharge is caused by precipitation. Using high resolution DEMs of channelized continental slope settings offshore Monterey, CA and Brunei Darussalam we extracted submarine channel profiles and drainage area statistics from five basins. In-situ and remote observations suggest discharge in these oceanic settings is determined by boundary conditions at the shelfedge. In spite of substantial differences in environment and physical process, the data yield submarine scaling exponents within the range of terrestrial (fluvial) observations. The convergence in scaling relationships from two very different settings supports theoretical arguments that channel network structure results from the aggregation of random walks.

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The tributary valley systems of the Almeria Canyon (Alboran Sea, SW Mediterranean): Sedimentary architecture

Cited by 36 publications

References 45 publications

Geomorphology and sedimentary features in the Central Portuguese submarine canyons, Western Iberian margin

Geomorphology and sedimentary features in the Central Portuguese submarine canyons, Western Iberian margin

The El Masnou infralittoral sedimentary environment (Barcelona province, NW Mediterranean Sea): morphology and Holocene seismic stratigraphy

Channel network scaling laws in submarine basins

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