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The lobe complex of the distal Almeria turbidite system: architecture and depositional history over the last 575.000 years

Authors: Alonso, B. (Belén); Llamosa, O. (Óscar); Ercilla, G. (Gemma); Estrada, F. (Ferrán); Juan-Valenzuela, C. (Carmen); Casas, D. (David); Vázquez, J.T. (Juan Tomás);

The lobe complex of the distal Almeria turbidite system: architecture and depositional history over the last 575.000 years

Abstract

[ES] Se presenta la arquitectura estratigráfica del complejo de lóbulo (LC) del sistema turbidítico distal de Almería de los últimos 575 ka basada en datos geológicos de muy alta resolución (perfiles sísmicos paramétricos, batimetría e isotopos estables de oxígeno). Su arqui-tectura deposicional sugiere que el lóbulo más antiguo (575 ka) está organizado por el apilamiento vertical de complejos de canal-dique/lóbulo. Sus características morfo-sedimentarias apuntan a: (i) su coincidencia con las de los sistemas mixtos de composición areno fangosa y que (ii) la reubicación lateral de los depósitos turbidíticos pudo estar condicionada por la carga de sedimento, la energía de los procesos gravitacionales, los procesos de avulsión y el confinamiento local. El análisis detallado de las sismofacies permite la identificación de lóbulos canalizados, depósitos de transporte en masa, y hemipe-lagitas formados durante los últimos 269 ka. Su distribución lateral y vertical sugiere que la actividad del cañón submarino y los movi-mientos en masa fueron mayores durante las etapas de bajo nivel del mar (MIS 8, MIS 6, MIS 4 y MIS 2) y la sedimentación dominante sería hemipelágica durante las etapas de alto nivel del mar (MIS 7 y MIS 5)

[EN] This paper presents the stratigraphic architecture of the lobe complex (LC) of the distal Almeria turbidite system over the last 575 ka based on very high-resolution data (seismic parametric sub-bo-ttom profiles, bathymetry and stable oxygen isotope core data). Its depositional architecture suggests the 575 ka oldest lobe represents a lobe system, which is essentially organized in vertical stacking of channel-levee/lobes. Their morpho-sedimentary characteristics point to: (i) this turbidite system roughly matches that of mixed sand-mud composition systems; and (ii) the lateral relocation of turbidites may be conditioned by factors such as the sediment load, the energy of gravity flows, related avulsion processes and the local morpho-logical confinement. The detailed seismofacies analysis enabled the identification of channel-levee/lobes, mass-transport deposits and hemipelagites formed over the last 269 ka. Their lateral and vertical distribution suggests that an increased submarine canyon activity and mass-movements took place during lowstand stages (MIS 8, MIS 6, MIS 4 and MIS 2) whereas hemipelagic settling dominated during the highstand stages (MIS 7 and MIS 5)

67 Sesión Científica de la Sociedad Geológica de España, 22-23 de noviembre de 2019, Peñarroya - Pueblonuevo, Córdoba.-- 4 pages, 5 figures

With the funding support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S), of the Spanish Research Agency (AEI)

This work was supported by the FAUCES Pro-ject (CTM2015-65461-C2-R; MINECO/FEDER)

Peer reviewed

Country
Spain
Keywords

Channelized lobes, Medio Marino y Protección Ambiental, turbiditas, Depósitos de movimiento en masa, mass-transport deposits, lóbulos canalizados, Centro Oceanográfico de Cádiz, Turbidites, Alboran Sea, Turbiditas, Mass-transport deposits, depósitos de movimiento en masa, Lóbulos canalizados, Mar de Alborán, turbidites

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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