Journal Article10.1023/A:1016355801344
Seismic stacking pattern of the Faro-Albufeira contourite system (Gulf of Cadiz): a Quaternary record of paleoceanographic and tectonic influences
Estefanía Llave,Francisco Javier Hernandéz-Molina,Luis Somoza,V. Díaz-del-Río,Dorrik A. V. Stow,Adolfo Maestro,J. Alveirinho Dias +6 more
140
TL;DR: In this paper, a Quaternary stratigraphic stacking pattern on the Faro-Albufeira drift system has been determined by analyzing a dense network of high-resolution single-channel seismic reflection profiles.
read more
Abstract: A Quaternary stratigraphic stacking pattern on the Faro-Albufeira drift system has been determined by analysing a dense network of high-resolution single-channel seismic reflection profiles. In the northern sector of the system an upslope migrating depositional sequence (elongate separated mounded drift) parallel to the margin has been observed associated with a flanking boundary channel (Alvarez Cabral moat) that depicts the zone of Mediterranean Outflow Water (MOW) acceleration and/or focussing. A consequent erosion along the right hand border and deposition on the left hand flank is produced in this sector. The sheeted aggrading drift is the basinward prolongation of the elongate separated mounded drift, and developed where the MOW is more widely spread out. The overall sheeted contourite system is separated into two sectors due to the Diego Cao deep. This is a recent erosional deep that has steep erosional walls cut into Quaternary sediments. Two major high-order depositional sequences have been recognised in the Quaternary sedimentary record, Q-I and Q-II, composed of eight minor high-order depositional sequences (from A to H). The same trend in every major and minor depositional sequence is observed, especially in the elongate mounded drift within Q-II formed of: A) Transparent units at the base; B) Smooth, parallel reflectors of moderate-high amplitude units in the upper part; and C) An erosional continuous surface of high amplitude on the top of reflective units. This cyclicity in the acoustic response most likely represents cyclic lithological changes showing coarsening- upward sequences. A total of ten minor units has been distinguished within Q-II where the more representative facies in volume are always the more reflective and are prograding upslope with respect to the transparent ones. There is an important change in the overall architectural stacking of the mounded contourite deposits from a more aggrading depositional sequence (Q-I) to a clear progradational body (Q-II). We suggest that Q-I and Q-II constitute high-order depositional sequences related to a 3rd-order cycle at 800 ky separated by the most prominent sea-level fall at the Mid Pleistocene Revolution (MPR), 900–920 ky ago. In more detail the major high-order depositional sequences (from A to H) can be associated with asymmetric 4th-order climatic and sea-level cycles. In the middle slope, the contourite system has a syn-tectonic development with diapiric intrusions and the Guadalquivir Bank uplift. This syn-tectonic evolution affected the overall southern sheeted drift from the A to F depositional sequences, but G and H are not affected. These last two depositional sequences are less affected by these structures with an aggrading stacking pattern that overlaps the older depositional sequences of the Guadalquivir Bank uplift and diapiric intrusions.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Contourites and associated sediments controlled by deep-water circulation processes: State-of-the-art and future considerations
TL;DR: The contourite paradigm was conceived a few decades ago, yet there remains a need to establish a sound connection between contourites, basin evolution and oceanographic processes.
746
The contourite depositional system of the Gulf of Cádiz: A sedimentary model related to the bottom current activity of the Mediterranean outflow water and its interaction with the continental margin
Francisco Javier Hernandéz-Molina,Estefanía Llave,Dorrik A. V. Stow,Marga García,Luis Somoza,Juan Tomás Vázquez,Francisco J. Lobo,Adolfo Maestro,V. Diaz del Rio,Ricardo León,Teresa Medialdea,Joan Gardner +11 more
TL;DR: In this paper, a synthesis of work conducted on the continental margin of the Gulf of Cadiz using a broad database collected by several cruises and projects supported by the Spanish Research Council and the NRL and Naval Oceanographic Office (USA), including: bathymetry, sidescan sonar imagery, seismic profiles, sediment cores, submarine photographs and physical oceanographic data, has enabled to establish a detailed understanding of the morphologic development of the margin, its Pliocene and Quaternary stratigraphy, and a full characterization of the contourite depositional system (CDS
231
Evolution of the Late Miocene Mediterranean–Atlantic gateways and their impact on regional and global environmental change
Rachel Flecker,Wout Krijgsman,Walter Capella,César C. Martins,Evelina Dmitrieva,Jan Peter Mayser,Alice Marzocchi,Sevasti Modestu,Diana Ochoa,Dirk Simon,M. A. Tulbure,Bas C.J. van den Berg,Marlies Van der Schee,Gert J. de Lange,Rob M. Ellam,Rob Govers,Marcus Gutjahr,Frits Hilgen,Tanja Kouwenhoven,Johanna Lofi,Johanna Lofi,Paul Meijer,Francisco J. Sierro,Naima Bachiri,N. Barhoun,Abdelwahid Chakor Alami,Beatriz Chacón,José A. Flores,John Gregory,James P. Howard,Daniel J. Lunt,Maria Ochoa,Rich D Pancost,Stephen J. Vincent,M. Z. Yousfi +34 more
TL;DR: In this paper, a comprehensive overview of the evolution of the Late Miocene gateways and the nature of Mediterranean-Atlantic exchange as deduced from published studies focussed both on the sediments preserved within the fossil corridors and inferences that can be derived from data in the adjacent basins.
Looking for clues to paleoceanographic imprints: A diagnosis of the Gulf of Cadiz contourite depositional systems
Javier Hernández-Molina,Estefanía Llave,Luis Somoza,M. Carmen Fernandez-Puga,Adolfo Maestro,Ricardo León,Teresa Medialdea,Antonio Barnolas,Margarita García,Víctor Díaz del Río,Luis Miguel Fernández-Salas,J. Tomás Vázquez,Fo. Lobo,João Alveirinho Dias,Jesús Rodero,Joan Gardner +15 more
TL;DR: In this article, a morphosedimentary map of the Gulf of Cadiz is presented, showing the contourite depositional system on the gulf's middle slope, which is constructed from a broad da- tabase provided by the Spanish Research Council and the U.S. Naval Research Laboratory.
203
High-resolution stratigraphy of the Mediterranean outflow contourite system in the Gulf of Cadiz during the late Pleistocene: The impact of Heinrich events
Estefanía Llave,Joachim Schönfeld,Francisco Javier Hernandéz-Molina,Thierry Mulder,Luis Somoza,V. Diaz del Rio,I. Sánchez-Almazo +6 more
TL;DR: In this paper, a detailed, high-resolution stratigraphic analysis of the Mediterranean Outflow contourite system at the continental slope of the Gulf of Cadiz has been carried out through the correlation between a dense network of seismic reflection profiles (sparker, airgun, 3.75 kHz and parametric echosounder), Calypso giant piston and standard gravity cores.
191
References
Chronology of fluctuating sea levels since the triassic.
TL;DR: An effort has been made to develop a realistic and accurate time scale and widely applicablechronostratigraphy and to integrate depositional sequences documented in public domain outcrop sections from various basins with this chronostratigraphic framework.
7.4K
Oxygen isotope and palaeomagnetic stratigraphy of Equatorial Pacific core V28-238: Oxygen isotope temperatures and ice volumes on a 105 year and 106 year scale☆
TL;DR: The core Vema 28-238 as discussed by the authors preserves an excellent oxygen isotope and magnetic stratigraphy and is shown to contain undisturbed sediments deposited continuously through the past 870,000 yr.
2.6K
An alternative astronomical calibration of the lower Pleistocene timescale based on ODP Site 677
TL;DR: In this paper, a modified version of the timescale proposed by Imbrieet et al. for the ODP Site 677 has been proposed, based on the precession signal in the record from ODP site 677 that provides the basis for the revised timescale.
1.6K
Oxygen isotopes, ice volume and sea level
TL;DR: In this paper, a comparison is made between the most detailed records of sea level over the last glacial cycle, and two high-quality oxygen isotope records, and a combined record is generated which may be a better approximation to ice volume than was previously available.
1.5K
Circulation in the Western Mediterranean Sea
TL;DR: A considerable amount of work has been made and definite results obtained about the circulation in the Western Mediterranean Sea during the last decade as mentioned in this paper, mainly in the south where all water masses appear to flow anticlockwise along the continental slope, as they do everywhere else in the sea.
1.5K