Recognition and stratigraphical significance of the Aptian unconformity in the Lusitanian Basin, Portugal

Dinis, Jorge; Trincão, Paulo Renato

doi:10.1006/cres.1995.1014

Cited by 18 publications

(8 citation statements)

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“…1979; Cunha and Pena dos Reis, 1995;Dinis et al, 2008). A break in sedimentation, related to the anti-clockwise rotation of Iberia during the Aptian-Albian transition, is expressed by a major unconformity (MU), well-known from large parts of the Lusitanian Basin (Dinis and Trincão, 1995;Dinis et al, 2002). After this phase of nondeposition and/or erosion, coarse-grained siliciclastic sediments with cross-bedded sands and conglomerates (Rodízio Formation) were deposited diachronously across the southern Lusitanian Basin (Dinis and Trincão, 1995;Rey et al, 2006;Dinis et al, 2008).…”

mentioning

confidence: 99%

Albian angiosperm pollen from shallow marine strata in the Lusitanian Basin, Portugal

Horikx

Hochuli

Feist-Burkhardt

et al. 2016

Review of Palaeobotany and Palynology

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The evolution of angiosperms significantly changed the composition of the terrestrial vegetation during the mid-Cretaceous. In contrast to the wealth of information available on the biology and systematic relationships of early angiosperms, the temporal patterns of their evolution and radiation are poorly constrained. Here we present a continuous angiosperm pollen record from well-dated shallow marine deposits in the Lusitanian Basin, Portugal. The São Julião section provides a solid stratigraphic framework to track angiosperm pollen distribution patterns from the early Albian to early Cenomanian at mid-latitudes. In comparison to previous angiosperm pollen records from the Lusitanian basin, the section shows an extended late Albian succession and provides new insights into the diversification of early angiosperms during this important interval. Productive palynological samples were analysed and 79 different angiosperm pollen types have been recorded. Throughout the Albian angiosperm pollen represent only a minor component of the total palynoflora. The early Albian pollen record is characterized by highly diverse assemblages of monoaperturate pollen of monocot or "magnoliid" affinity and by the first appearance of polyporate and tricolpate pollen of eudicot affinity. A distinct diversification phase among tri-and poly-aperturate pollen (e.g., Cretacaeiporites, Retitrescolpites, Rousea, Striatopollis and Tricolpites) and the presence of conspicuous pollen grains assigned to Dichastopollenites characterize the middle and late Albian palynological assemblages. Thus, the section records a striking sequence of appearances of important angiosperm pollen morphologies. Monocolpates, polyporates and tricolpates appear in the early Albian whereas tricolporates appear from the early part of the late Albian onwards. Furthermore, well-constrained biostratigraphic ranges of selected angiosperm pollen from mid-latitudes are presented. In view of these new data, the temporal framework of the palynological Subzones II-B and II-C in the Potomac Group succession from the Atlantic Coastal Plain, eastern USA is revised to a middle to late Albian age.

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mentioning

confidence: 99%

Albian angiosperm pollen from shallow marine strata in the Lusitanian Basin, Portugal

Horikx

Hochuli

Feist-Burkhardt

et al. 2016

Review of Palaeobotany and Palynology

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“…The onshore sedimentary infill of this tectono-sedimentary unit of the Lusitanian Basin reaches a maximum thickness of 430 m in the depocentre of Cascais, where it consists of nine formations with Berriasian to Albian open shelf, reef, and lagoonal platform carbonates, interbedded with nearshore mixed carbonate-siliciclastic rocks and regressive coarse alluvial siliciclastics (Rey, 1992(Rey, , 2006(Rey, , 2010. This succession, recorded by large exposures and strong lateral variations of facies, is a noteworthy setting for studies of the events occurred on the West Portuguese Continental Margin, from the Neocimerian tectonic phase (Rey et al, 2003Rey, 2006) to a well-marked Aptian rupture (Dinis and Trincão, 1995;Dinis et al, 2002Dinis et al, , 2008) and a final transition to a passive context, with extension of a large carbonate platform during the Cenomanian (Berthou, 1984a(Berthou, , 1984bCallapez, 2008;Barroso-Barcenilla et al, 2011;Segura et al, 2014). According to Rey et al (2003Rey et al ( , 2006 and Rey (2006Rey ( , 2010, three second-order depositional cycles can be identified from the upper Berriasian to the Albian, with transgressive maximums recorded at the lower Hauterivian, lower Aptian, and upper Albian, and regressive boundaries at the lower Barremian, lower upper Aptian, and Albian-Cenomanian boundary.…”

Section: Geographical and Geological Settingsmentioning

confidence: 94%

Dinosaur tracks from the Early Cretaceous of Parede tracksite (Cascais, Portugal): New implications on the sauropod palaeobiology of the Iberian Peninsula

Santos

Callapez

Castanera

et al. 2015

Journal of Iberian Geology

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A recently discovered Early Cretaceous (early late Albian) dinosaur tracksite at Parede beach (Cascais, Portugal) reveals evidence of dinoturbation and at least two sauropod trackways. One of these trackways can be classified as narrow-gauge, which represents unique evidence in the Albian of the Iberian Peninsula and provides for the improvement of knowledge of this kind of trackway and its probable trackmaker, in an age when the sauropod record is scarce. These dinosaur tracks are preserved on the upper surface of a marly limestone bed that belongs to the Galé Formation (Água Doce Member, middle to lower upper Albian). The study of thin-sections of the beds C22/24 and C26 in the Parede section has revealed a microfacies composed of foraminifers, radiolarians, ostracods, corals, bivalves, gastropods, and echinoids in a mainly wackestone texture with biomicritic matrix. These assemblages match with the lithofacies, marine molluscs, echinids, and ichnofossils sampled from the section and indicate a shallow marine, inner shelf palaeoenvironment with a shallowing-upward trend. The biofacies and the sequence analysis are compatible with the early late Albian age attributed to the tracksite. These tracks and the moderate dinoturbation index indicate sauropod activity in this palaeoenvironment. Titanosaurs can be dismissed as possible trackmakers on the basis of the narrow-gauge trackway, and probably by the kidney-shaped manus morphology and the pes-dominated configuration of the trackway. Narrow-gauge sauropod trackways have been positively associated with coastal palaeoenvironments, and the Parede tracksite supports this interpretation. In addition, this tracksite adds new data about the presence of sauropod pes-dominated trackways in cohesive substrates. As the Portuguese Cretaceous sauropod osteological remains are very scarce, the Parede tracksite yields new and relevant evidence of these dinosaurs. Furthermore, the Parede tracksite is the youngest evidence of sauropods in the Portuguese record and some of the rare evidence of sauropods in Europe during the Albian. This discovery enhances the palaeobiological data for the Early Cretaceous Sauropoda of the Iberian Peninsula, where the osteological remains of these dinosaurs are relatively scarce in this region of southwestern Europe. Therefore, this occurrence is also of overall interest due to its impact on Cretaceous Sauropoda palaeobiogeography.Keywords: Sauropod tracks, intertidal palaeoenvironment, Lower Cretaceous, upper Albian, Lusitanian Basin, Portugal Resumen El reciente descubrimiento de huellas de dinosaurios del Cretácico Inferior (inicio del Albiense tardío) en la playa de Parede (Cascais, Portugal) ha revelado evidencias de dinoturbación y al menos dos rastros de saurópodos. Uno de ellos puede clasificarse como estrecho y representa la única evidencia de este tipo de rastros en el Albiense de la Península Ibérica. Estos nuevos datos permiten mejorar el conocimiento tanto de este tipo de rastros como de su posible productor, en una edad en la...

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“…The third major break in sedimentation is late Aptian, matching the beginning of seafloor spreading in the Galician sector (Schärer et al 2000), final separation of subcontinental mantle lithosphere ) and a second phase of alkaline magmatism (Jagoutz et al 2007). This unconformity also marks the beginning of post-rift sedimentation, a process that started with widespread deposition of coarse siliciclastic sediments (Cunha and Reis 1995;Dinis and Trincão 1995;Dinis et al 2002Dinis et al , 2008 and culminated in the Albian and Cenomanian with the formation of the west Portuguese carbonate platform (Soares 1980;Berthou 1984a, b;Callapez 2008). A further sedimentary rupture was contemporaneous with the Cenomanian-Turonian transition, when the southern domain of the onshore margin was significantly uplifted and new readjustments occurred on the Iberian block (Dinis et al 2008;Barroso-Barcenilla et al 2011;Segura et al 2014).…”

Section: Geological Setting and Stratigraphymentioning

confidence: 99%

“…late Carboniferous to Permian) crystalline rocks were widely exhumed at this time and were the main sources of sediment. Intense erosion after the late Aptian was likely associated with the thermal and isostatic readjustment of the north-west area of the Iberian microplate (Hiscott et al 1990;Dinis and Trincão 1995;Dinis et al 2002). At this time, most fluvial systems in northern locations of the west Iberian margin were probably relatively small and the streams incision was limited, producing an age fingerprint in ZBUA that, except for the presence of residual proportions of Palaeozoic zircon, resembles the age signatures reported for the Ediacaran to Lower Cambrian metapelites from western locations of the Central Iberian Zone (Talavera et al 2012;Pereira et al 2012b).…”

Section: Implications For East Atlantic Palaeogeography and Palaeodramentioning

confidence: 99%

Detrital zircon geochronology of the Cretaceous succession from the Iberian Atlantic Margin: palaeogeographic implications

Dinis

Tassinari

et al. 2015

Int J Earth Sci (Geol Rundsch)

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The Barremian unconformity marks a sudden rise in the proportion of c. 375-275 Ma zircon ages accompanied by a decrease in the abundance of the c. 420-385 Ma and c. 1.2-0.9 Ga ages. This shift in the zircon signature, which is contemporaneous with the separation of the Galicia Bank from Flemish Cap, reflects increased denudation of Variscan crystalline rocks and a reduction in source material from NW Iberia and adjoining areas. The late Aptian unconformity, which represents the largest hiatus in the sedimentary record, is reflected by a shift in late Palaeozoic peak ages from c. 330-310 Ma (widespread in Iberia) to c. 310-290 Ma (more frequent in N Iberia). It is considered that this shift in the age spectra resulted from a westward migration of catchment areas following major uplift in northern Iberia and some transport southward from the Bay of Biscay under the influence of a well-established Atlantic circulation.

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Recognition and stratigraphical significance of the Aptian unconformity in the Lusitanian Basin, Portugal

Cited by 18 publications

References 0 publications

Albian angiosperm pollen from shallow marine strata in the Lusitanian Basin, Portugal

Albian angiosperm pollen from shallow marine strata in the Lusitanian Basin, Portugal

Dinosaur tracks from the Early Cretaceous of Parede tracksite (Cascais, Portugal): New implications on the sauropod palaeobiology of the Iberian Peninsula

Detrital zircon geochronology of the Cretaceous succession from the Iberian Atlantic Margin: palaeogeographic implications

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