Reinterpretation of the Quaternary sedimentary infill of the Ría de Vigo, NW Iberian Peninsula, as a compound incised valley

Martínez-Carreño, Natalia; García‐Gil, Soledad

doi:10.1016/j.quascirev.2017.08.015

Cited by 24 publications

(21 citation statements)

References 75 publications

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“…Accordingly, in the absence of direct dating, hypothesis F2 is considered more appropriate to explain the sedimentary record of the RdF, so surface D4 is interpreted as the subaerial unconformity associated with the LGM sea‐level fall. The oldest sedimentary units underlying unconformity D4 within the RdF (U1 to U4) probably correspond to Late Pleistocene deposits that have tentatively been correlated with the sequences of a similar age (representing glacial cycles since 500 kyr bp ) recently described in the Ría de Vigo (Martínez‐Carreño & García‐Gil, ). The resemblance between the records of the two rias is reasonable because sea‐level variations and geology at a regional scale are similar.…”

Section: Discussionmentioning

confidence: 54%

“…the Ría de Ferrol is possibly a simple incised valley fill like most on the European Atlantic coast (Chaumillon et al ., ). Hypothesis F2: Surface D4 is interpreted as the subaerial unconformity associated with the LGM sea‐level fall and units U1 to U4 are interpreted as pre‐LGM deposits: i.e. the Ría de Ferrol is a compound incised valley fill similar to that described in the Ría de Vigo (Martínez‐Carreño & García‐Gil, ).…”

Section: Discussionmentioning

confidence: 99%

“…The coast of Galicia (north‐west Iberia) features several incised valleys, called rias, whose infill was classically studied using the ‘simple’ model approach (Rey, ; Rey & Somoza, ; García‐Gil et al ., ; García‐García et al ., ). However, recent findings proved the existence of sediments deposited before the Last Glacial Maximum (LGM), leading to the revision of previous studies and the drafting of a new ‘compound’ model of infill for the Ría de Vigo (Martínez‐Carreño & García‐Gil, ), with probable occurrences in the rest of the Galician rias.…”

Section: Introductionmentioning

confidence: 94%

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From a river valley to a ria: Evolution of an incised valley (Ría de Ferrol, north‐west Spain) since the Last Glacial Maximum

Cartelle

García‐Gil

2019

Sedimentology

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The evolution of incised valleys is an important area of research due to the invaluable data it provides on sea-level variations and depositional environments. In this article the sedimentary evolution of the R ıa de Ferrol (northwest Spain) from the Last Glacial Maximum to the present is reconstructed using a multidisciplinary approach, combining seismic and sedimentary facies, and supported by radiocarbon data and geochemical proxies to distinguish the elements of sedimentary architecture within the ria infill. The main objectives are: (i) to analyse the ria environment as a type of incised valley to evaluate the response of the system to the different drivers; (ii) to investigate the major controlling factors; and (iii) to explore the differentiation between rias and estuaries. As a consequence of the sea-level rise subsequent to the Last Glacial Maximum (ca 20 kyr BP), an extensive basin, drained by a braided palaeoriver, evolved into a tide-dominated estuary and finally into a ria environment. Late Pleistocene and Holocene high-frequency sea-level variations were major factors that modulated the type of depositional environments and their evolution. Another major modulating factor was the antecedent morphology of the ria, with a rock-incised narrow channel in the middle of the basin (the Ferrol Strait), which influenced the evolution of the ria as it became flooded during Holocene transgression. The strait acted as a rock-bounded 'tidal inlet' enhancing the tidal erosion and deposition at both ends, i.e. with an ebb-tidal delta in the outer sector and tidal sandbanks in the inner sector. The final step in the evolution of the incised valley into the modern-defined ria system was driven by the last relative sea-level rise (after 4 kyr BP) when the river mouths retreated landward and a single palaeoriver was converted into minor rivers and streams with scattered mouths in an extensive coastal area.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

See 1 more Smart Citation

From a river valley to a ria: Evolution of an incised valley (Ría de Ferrol, north‐west Spain) since the Last Glacial Maximum

Cartelle

García‐Gil

2019

Sedimentology

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“…Assuming a rough sedimentation rate between 3 and 6 mm y −1 [27], the bottom of the core (220 cm) could respond to sediments deposited 300-700 years ago. However, these sediments might be older according to [49], who dated the sediments in San Simon Bay deposited at a 200-220 cm depth to have sunk 8905 ± 305 cal. aBP.…”

Section: Resultsmentioning

confidence: 99%

Environmental Assessment of Trace Metals in San Simon Bay Sediments (NW Iberian Peninsula)

et al. 2020

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A gravity core (220 cm depth) was collected to investigate the geochemistry, enrichment, and pollution of trace metals in anoxic sediments from San Simon Bay, an ecosystem of high biological productivity in the northwest of Spain. A five-step sequential extraction procedure was used. The Cu, Pb, and Zn contents decreased with depth, with maximum values in the top layers. Ni and Zn were bound to pyrite fractions, while Cd and Pb were associated with the most mobile fractions. The analyzed metals were associated with the fractions bound to organic matter, mainly with the strongly bound to organic matter fraction. High Cd and Cu values were observed. The fractionation showed a high mobility for Cd (28.3–100%) and Pb (54.0–70.2%). Moreover, the pollution factor and the geoaccumulation index reflected a high contamination for Pb and a moderate contamination for Cu and Zn in the superficial layers, pointing to a possible ecotoxicological risk to organisms in San Simon Bay.

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“…Although Quaternary tectonic activity has been confirmed in the region (e.g. Martínez‐Carreño & García‐Gil, ), no significant movements have been recognized since the Late Pleistocene (Blanco‐Chao et al ., ).…”

Section: Doniños Coastal System Settingmentioning

confidence: 98%

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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Reinterpretation of the Quaternary sedimentary infill of the Ría de Vigo, NW Iberian Peninsula, as a compound incised valley

Cited by 24 publications

References 75 publications

From a river valley to a ria: Evolution of an incised valley (Ría de Ferrol, north‐west Spain) since the Last Glacial Maximum

From a river valley to a ria: Evolution of an incised valley (Ría de Ferrol, north‐west Spain) since the Last Glacial Maximum

Environmental Assessment of Trace Metals in San Simon Bay Sediments (NW Iberian Peninsula)

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

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