Late Pleistocene-Holocene sediments on the Spanish continental shelves: Model for very high resolution sequence stratigraphy

Hernández-Molina, F. Javier; Somoza, Luı́s; Rey, J.; Pomar, Luis

doi:10.1016/0025-3227(94)90057-4

Cited by 134 publications

(59 citation statements)

References 36 publications

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“…Vanney and Menanteau (1985) recognised remains of these palaeo-relieves. At that time, the coastline was placed som e 13-14 km towards the south and southwest from its present position, and the sea level sorne 120 below present MSL (Hernández-Molina et al, 1994).…”

Section: Palaeogeographical Interpretation and Discussion (Figs 6 Anmentioning

confidence: 95%

“…There are also a num ber of papers dedicated to the physiography, marine geology and sedimentation in the continental shelf of the Gulf of Cadiz and 1985;Gutiérrez-Más et 1994;Hernández-Molina et al, 1994;Somoza et al, 1997;van Geen et al, 1997;Maldonado and 1999;Nelson and Maldonado, Nelson et al, 1999;. these papers did not fully extend their observations to the coastal areas were the studied incised-valleys occur.…”

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confidence: 99%

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Depositional history of estuarine infill during the last postglacial transgression (Gulf of Cadiz, Southern Spain)

et al. 2000

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The Late Pleistocene ami Holocene evolution of the estuaries in !he Gulf of Cadiz is interpreted for the first time using drill cores, logs, trenches, and 38 new radiocarbon data, and the results compared with lhe she!f The Odie!, Tinto and Guadalete Rivers deposited conglomerales during a highstand lhat did not reach the present sea level dated al ca. 25-30 ka (Isotopic Stage (IS) 3), corresponding lo a relatively humid period in the area. Rivers incised these coarse-grained deposits during the last main lowsland at ca. 18 ka, when sea level dropped to -120 m and the coastline lay 14 km seawards from !he presenL The erosional surface is a sequence boundary and the f100ding slIrface of tl1e postglacial eustatic rise, overlain by !he valley fill deposits of the transgressive and highstand phases of the last fourth-and fif!h-order depositional sequences recognised in !he shelf The first marine int1uence in the estuaries during the transgression occurs at -25/ -30 m at ca. 10,000 years BP. According to tossil assemblages, the transgressed basins changed fmm brackish to more open marine as !he sea rose lIntil ca. 6500 years BP, when it reached !he maximum f100ding ami the sandy estuarine barriers ceased to retrograde toward the muddy central basins. Then, the rate of eustatic rise decreased drastically, and !he estuarine filling followed a two-fold pattem govemed by the progressive change from vertical accretion to lateral (centripelal) progradation. At ca. 4000 years BP the t1uvial input surpassed !he already negligible rate of rise, causing partial emergence of tidal f1ats and spit barriers in the largely filled estuarine basins. Prevalence of coastal progradation upon vertical accretion al ca. 2400 years BP caused accelerated expansion of tidal t1ats and rapid growth of the sandy barriers. Further changes since the 16th century ref1ect widespread anthropic impacts.

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Section: Palaeogeographical Interpretation and Discussion (Figs 6 Anmentioning

confidence: 95%

mentioning

confidence: 99%

Depositional history of estuarine infill during the last postglacial transgression (Gulf of Cadiz, Southern Spain)

et al. 2000

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“…to the two major Holocene progradational phases reported in the Iberian coastal deposits, and also around the world (Van Andel and Laborel 1964;Donoghue, 1993;Hernández-Molina et al, 1994;Zazo et al, 1994;Goy et al, 1996;Somoza et al, 1998;Fernández-Salas et al, 2003). The occurrence of these phases was governed by sixth-order eustatic-climatic changes, and their exact time varies according to the region investigated (Fernández-Salas, 2008).…”

Section: Sequence Stratigraphy and Age Modelmentioning

confidence: 94%

“…The Pleistocene-Holocene continental shelf of the El Masnou region is made up the vertical stacking of downlapping regressive deposits whose building was governed by glacio-eustatic sea-level changes (Checa et al, 1988). In fact, the high-resolution seismic stratigraphy of northern Catalonia is mostly a response to asymmetric and high-frequency fourth-order sea-level falls (100-110 ky) (Farrán and Maldonado, 1990;Ercilla et al, 1994;Hernández-Molina et al, 1994;Ercilla et al 1995;Chiocci et al, 1997). The local differences in stratal pattern, thickness, directions of progradation and distribution were conditioned by the interplay between local factors (e.g.…”

Section: Geological Framework and Oceanographymentioning

confidence: 99%

The El Masnou infralittoral sedimentary environment (Barcelona province, NW Mediterranean Sea): morphology and Holocene seismic stratigraphy

Ercilla¹,

Estrada²,

Casas³

et al. 2009

Sci. Mar.

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SUMMARY: A detailed analysis of the morphology and the Holocene seismic and sequence stratigraphy and architecture of the infralittoral sedimentary environment of the El Masnou coast (Catalonia, NW Mediterranean Sea) was carried out using multibeam bathymetry and GeoPulse seismic data. This environment extends down to 26-30 m water depth, and is defined morphologically by two depositional wedges whose seafloor is affected by erosive furrows, slides, fields of large-and smallscale wavy bedforms, and dredging trenches and pits. Erosive terraces are also identified in the transition domain toward the inner continental shelf. The Holocene stratigraphy of the infralittoral environment is defined by two major seismic sequences (lower and upper), each one formed by internal seismic units. The sequences and units are characterised by downlapping surfaces made up of deposits formed by progradation of coastal lithosomes. The stratigraphy and stratal architecture, displaying a retrogradational arrangement with progradational patterns of minor order, were controlled by different sea-level positions. The stratigraphic division represents the coastal response to the last fourth-order transgressive and highstand conditions, modulated by small-scale sea-level oscillations (≈1-2 m) of fith to sixth order. This study also highlights the advantage of an integrated analysis using acoustic/seismic methods for practical assessment of the anthropogenic effects on infralittoral domains based on the association of marine geological observations. Keywords: infralittoral environment, morphology, stratigraphy, Holocene, El Masnou. RESUMEN: El ambiEntE sEdimEntario infralitoral dE El masnou (provincia dE barcElona, mEditErránEo no): morfología y Estratigrafía sísmica dEl HolocEno. -En este trabajo se presenta el estudio detallado de la morfología y la estratigrafía sísmica y secuencial del Holoceno que caracteriza al ambiente infralitoral de El Masnou y que ha sido llevado a cabo mediante datos obtenidos con sonda multihaz y perfiles de sísmica monocanal de alta resolución de GeoPulse. Este ambiente infralitoral se extiende hasta los 26-30 m de profundidad y está morfológicamente caracterizado por dos cuñas deposicionales cuyas superficies están afectadas por surcos erosivos, deslizamientos, campos de ondas de sedimento de pequeña y gran escala, y formas de origen antrópico (fosas y hoyos de dragado). También se identifican terrazas erosivas en el área de transición a la plataforma continental. La estratigrafía del Holoceno de este ambiente infralitoral está definida por dos secuencias sísmicas (inferior y superior), y cada una de ellas comprende internamente unidades sísmicas. El desarrollo de esta estratigrafía y de su arquitectura ha estado controlado por cambios del nivel del mar. Las divisiones estratigráficas definidas representan la respuesta costera al último estadio transgresivo y de alto nivel del mar de 4º orden, modulado por pequeñas oscilaciones (≈1-2 m) de nivel del mar de 5º y 6º orden. Por otra parte, el presente estudio mue...

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“…Lacking age control, these authors rely upon data from other authors for their chronology. Ages assigned to these units are the beginning of the Deglaciation (pro bably ' "' -' 15 cal ka BP), and the successive short-lived cool episodes Older Dryas (also recognised in the Alboran Sea by Nebout et al, 1999), Younger Dryas and Holocene Cool Event at '"'-'8.2 cal ka BP, the latter two also recognised in the Alboran Sea (Hernández-Molina et al, 1994).…”

Section: U5mentioning

confidence: 97%

The coastal archives of the last 15ka in the Atlantic–Mediterranean Spanish linkage area: Sea level and climate changes

Cardeña

Dabrio

Goy

et al. 2008

Quaternary International

114

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Sea level and clima te changes archived in various coastal environments during the last part of the last glacial and present interglacial periods are investigated by interpolating available geomorphology, sedimentology, palaeontology and geochronology data. The coastal response to these changes depended on the environment and geographic location. Changes of sea level during the rising, transgressive phase are well recorded in the sedimentary filling of the estuaries, whereas during the phase of highstand they are best recorded in beach-barrier environments. The postglacial rise of sea level took place in two phases: a rapid rise until 6500 cal BP, and a second phase of near stability with minor oscillations of metric magnitude. Regarding climate changes, there is no record of changing temperatures in the coastal zones of southern Spain, although there is in precipitation and wind intensityjvelocity. After 7-5 cal ka BP, the general climatic trend towards aridity was punctuated by several short-lived (centennial) episodes of increased aridity that occurred with a millennial cycle, often coincident with Bond cool events and, in sorne cases, with decreases of sea surface temperatures. The absence of human in ter ventio n in vegetation composition until 2000 BP suggests that most environmental coastal shifts were climatically driven,

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Late Pleistocene-Holocene sediments on the Spanish continental shelves: Model for very high resolution sequence stratigraphy

Cited by 134 publications

References 36 publications

Depositional history of estuarine infill during the last postglacial transgression (Gulf of Cadiz, Southern Spain)

Depositional history of estuarine infill during the last postglacial transgression (Gulf of Cadiz, Southern Spain)

The El Masnou infralittoral sedimentary environment (Barcelona province, NW Mediterranean Sea): morphology and Holocene seismic stratigraphy

The coastal archives of the last 15ka in the Atlantic–Mediterranean Spanish linkage area: Sea level and climate changes

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