Journal
SEDIMENTOLOGY
Volume 65, Issue 6, Pages 1891-1917Publisher
WILEY
DOI: 10.1111/sed.12451
Keywords
Bedrock topography; coastal lakes; Galicia; high-resolution chronology; Holocene; sea-level changes; sequence stratigraphy
Categories
Funding
- Spanish Ministry of Economy and Competitiveness through the project CONSOLIDER- Ingenio 2010 GRACCIE [CSD2007-00067]
- Spanish Ministry of Economy and Competitiveness through the project RapidNAO [CGL2013-40608-R]
- Spanish Ministry of Economy and Competitiveness through the project PaleoMODES [CGL2016-75281-C2-1-R]
- Portuguese Science Foundation (FCT) [SFRH/BPD/79923/2011, SFRH/BPD/82103/2011]
- Xunta de Galicia (Plan I2C) - European Social 94 Fund
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/82103/2011, SFRH/BPD/79923/2011] Funding Source: FCT
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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 Doninos 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 Doninos perched lake was formed ca 45kabp. 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 102kabp and 80kabp, during rapidly rising sea-level characteristic of the transgressive systems track period. At 11kabp, 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 1kabp, the barrier reclosed and the present-day lake was reformed, with the water level reaching as high as 5m above mean sea-level. The depositional evolution of the Doninos 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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