The Masnou infralittoral sedimentary environment (Barcelona province): morphology and late Holocene stratigraphy
- Autores: Gemma Ercilla Zárraga, Ferran Estrada Llacer, David Casas, Ruth Durán Gallego, Marta Nuez, Belén Alonso Martínez, Marcelino Farrán
- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 10, 2008 (Ejemplar dedicado a: VII Congreso Geológico de España), págs. 611-614
- Idioma: español
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Resumen
This study was undertaken using shallow-water multibeam echosounder and a Geo-Pulse system. Five groups of morphosedimentary features are identified regarding their genesis. In the infralittoral environment of the El Masnou coast, four of them represent sedimentary features (depositional, erosive, instability and hydrodynamic features) and the fifth one is am anthropogenic feature. The depositional features comprise infralittoral wedges; the erosive features include furrows and terraces; the instability features are characterized by slides; the hydrodynamic features refer to fields of large- (hundreds meters long) and small- (tens meters long) scale wavy bedforms; and the anthropogenic features comprise trenches and pits related to successive dredges. The late Holocene stratigraphy of the infralittoral environment is defined by two major seismic sequences, lower and upper, each one formed by internal seismic units. The development of this stratigraphy and stacking patterns has been governed by sea-level changes. The stratigraphic division represents the coastal response to the last 4th order transgressive and highstand conditions, modulated by small-scale sea level oscillations (1-2 m) of 5th to 6th order.
