Holocene transgression recorded by sand composition in the mesotidal Galician coastline (NW Spain)

Arribas, José; Alonso, Ángela; Pagés, J. L.; González‐Acebrón, Laura

doi:10.1177/0959683609353429

Cited by 13 publications

(13 citation statements)

References 36 publications

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“…The antropogenically forced increase in sedimentation rates can be tracked back to the last two millennia, coincident with deforestation related to human activities (Allen et al 1996;Muñoz Sobrino et al 2007) and, in general, sedimentation rates increased towards recent times. Vilas et al 1991;Bao et al 2007;González-Villanueva et al 2009;Arribas et al 2010) are, in general, also coincident with these intervals. Ages of peat levels detected in lagoons (e.g.…”

Section: Geochronology Sedimentation Rates Environments and Depocenmentioning

confidence: 81%

“…8.9). Jouanneau et al 2002;Lorenzo et al 2007;Pena et al 2007;Á lvarez-Iglesias & Rubio 2009a;Costas et al 2009;Lantzsch et al 2009aLantzsch et al , 2009bArribas et al 2010;Mohamed et al 2011). Jouanneau et al 2002;Á lvarez-Iglesias et al 2007Á lvarez-Iglesias et al , 2009Muñoz Sobrino et al 2007;Pérez-Arlucea et al 2007;González-Villanueva et al 2009;Lantzsch et al 2009a, b).…”

Section: Geochronology Sedimentation Rates Environments and Depocenunclassified

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Chapter 8 The NW Iberian continental shelf

Rey

Álvarez-Iglesias

Araújo

et al. 2014

Memoirs

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The continental shelf of NW Iberia is of particular interest due to the complex North Atlantic rifting tectonics and modern oceanographic processes that led to its current geomorphological configuration and sediment dynamics. The shelf forms a narrow slow-dipping north-bearing geomorphological structure with a well-defined shelf break located at water depths of 160-180 m. It is a continental margin with sedimentation rates of about 1.5 + 2.0 mm a 21 (the highest values in recent bottom sediments of the ría) subjected to a highly energetic seasonal regime of waves and tides, seasonal upwelling and coast-parallel currents, significantly modulated by the North Atlantic Oscillation. Sediment provenance is dominated by inputs of continental sediments via runoff and riverine discharges and, to a lesser extent, by an upwelling-enhanced bioclastic input. Present-day sedimentation in the area occurs closely associated with two geomorphologically distinct sedimentary environments: the rías inner shelf sedimentary systems and the open continental shelf, and their subsequent evolution since the last glacial.

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Section: Geochronology Sedimentation Rates Environments and Depocenmentioning

confidence: 81%

Section: Geochronology Sedimentation Rates Environments and Depocenunclassified

Chapter 8 The NW Iberian continental shelf

Rey

Álvarez-Iglesias

Araújo

et al. 2014

Memoirs

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“…The coastal depositional sequences include progradational, shallowing upward estuarine sediment sequences with sand dune barrier complexes. The Holocene flooding of the coastal basins eroded the previously deposited Late Pleistocene sedimentary units in open coasts and cliffs (Alonso & Pagés, , ; Lorenzo et al ., ; Arribas et al ., ). Most coastal systems in this region show evidence of erosion associated with land use changes and human activities (Marcos & Amores, ).…”

Section: Doniños Coastal System Settingmentioning

confidence: 99%

Formation and evolution of back‐barrier perched lakes in rocky coasts: An example of a Holocene system in north‐west Spain

et al. 2018

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Coastal back‐barrier perched lakes are freshwater bodies that are elevated over sea‐level and are not directly subjected to the inflow of seawater. This study provides a detailed reconstruction of the Doniños back‐barrier perched lake that developed at the end of a small river valley in the rocky coast of the north‐west Iberian Peninsula during the Holocene transgression. Its sequence stratigraphy was reconstructed based on a core transect across the system, the analyses of its lithofacies and microfossil assemblages, and a high‐resolution radiocarbon‐based chronology. The Doniños perched lake was formed ca 4·5 ka bp. The setting of the perched lake was favoured by Late Holocene sea‐level stabilization and the formation of a barrier and back‐barrier basin, which was contemporaneous with the high systems tract period. This basin developed over marine and lagoonal sediments deposited between 10·2 ka bp and 8·0 ka bp, during rapidly rising sea‐level characteristic of the transgressive systems track period. At 1·1 ka bp, the barrier was breached and the perched lake was partially emptied, causing the erosion of the back‐barrier basin sediments and a significant sedimentary hiatus. Both enhanced storminess and human intervention were likely to be responsible for this event. After 1 ka bp, the barrier reclosed and the present‐day lake was reformed, with the water level reaching as high as 5 m above mean sea‐level. The depositional evolution of the Doniños system serves as a model of coastal back‐barrier perched lakes in coastal clastic systems that have developed over gently seaward‐dipping rugged substrates at small distances from the shoreline and under conditions of rising sea‐level and high sediment supply. A review of estuaries, back‐barrier lagoons, pocket beaches and back‐barrier perched lakes in the rocky coast of north‐west Spain shows that the elevation of the bedrock is the main factor controlling the origin and evolution of these systems.

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“…The Anllóns River, Galicia, North‐West Spain (Fig. ), is 516 km 2 (Devesa‐Rey et al ) and drains a predominately igneous and metamorphic hinterland (Arribas et al ). The dominant land uses are pastoral and arable agriculture and forestry (Devesa‐Rey et al ; Costas et al ).…”

Section: Study Areamentioning

confidence: 99%

“…The Anllóns Estuary is a semidiurnal, mesotidal estuary, approximately 10 km long and 1 km wide. The Galician coast is wave‐dominated with maximum tides of up to ∼ 4.4 m (Arribas et al ). The Anllóns Estuary contains a typical range of estuarine sedimentary environments from sand flats to mud flats, detached and attached bars and flood plains and has a spit and dune system protecting the estuary from the open sea (Fig.…”

Section: Study Areamentioning

confidence: 99%

Extensive evaporation in a modern temperate estuary: Stable isotopic and compositional evidence

Barrie

Worden

Barrie

et al. 2015

Limnology & Oceanography

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Estuaries have long been recognized as sites of major compositional fluctuations that can have a range of effects including mineral growth in the water column and in the underlying estuarine sediment. We have studied chloride and sodium concentrations and stable isotopes (H and O) from a suite of estuarine waters from the temperate Anll ons estuary in NW Spain to assess the complexity of estuarine mixing process. Water samples were collected hourly from in estuary sites over three consecutive days and end-member samples were collected on each sampling day. Evaporative concentration of the estuarine waters is demonstrated by the maximum concentration of geochemically conservative chloride being as much as 17.5% greater in the estuary than in the local seawater. Relative to chloride concentration, both d 2 H and d 18 O values of estuary waters tend to be more enriched than would be expected for the simple physical mixing of river water and seawater. These patterns can only be plausibly accounted for through evaporation affecting the water, concentrating the chloride and causing isotope fractionation. We have modelled the effects of evaporation on chloride concentration and the stable isotopes in the estuary; the results closely match the distribution of analytical data suggesting that up to 40% evaporation has happened. We have demonstrated that two thirds of estuarine water samples analysed underwent between 5% and 40% evaporation. This previously unreported degree of evaporation in estuaries has important implications for any processes that is effected by the consequent degree of elevated solute concentration.Estuaries are locations of complex water and sediment mixing patterns due to the twice-daily influx of seawater (Berner and Berner 2012). Estuarine sediments and the signatures that result from the competing influences of fluvial and marine systems are of interest in their own right and as analogues to understand ancient, deeply buried estuarine sandstones. Daily variations in water chemistry through tidal cycles result in complex systems of water mixing, and sediment deposition and resuspension (Pritchard

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Holocene transgression recorded by sand composition in the mesotidal Galician coastline (NW Spain)

Cited by 13 publications

References 36 publications

Chapter 8 The NW Iberian continental shelf

Chapter 8 The NW Iberian continental shelf

Formation and evolution of back‐barrier perched lakes in rocky coasts: An example of a Holocene system in north‐west Spain

Extensive evaporation in a modern temperate estuary: Stable isotopic and compositional evidence

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