Palynostratigraphy of the Toca da Moura and Cabrela Complexes, Ossa Morena Zone, Portugal. Geodynamic implications

Pereira, Zélia; Oliveira, Vítor; Oliveira, José Tomás

doi:10.1016/j.revpalbo.2005.07.008

Cited by 49 publications

(34 citation statements)

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“…The SSB sediments rest over two OMZ units (see Table 1), the Toca da Moura Volcano-Sedimentary Complex Machado and Hladil, 2010;Oliveira et al, 2006;Pereira et al, 2006;Santos et al, 1987 -see Fig. 1) and the Grupo de Cuba Felsics, that is made of microdiorites and porphyry rocks (Gonçalves, , 1984.…”

Section: Geological Settingmentioning

confidence: 99%

Palynology, Stratigraphy and Geometry of the Pennsylvanian continental Santa Susana Basin (SW Portugal)

Machado

Silva

Almeida

2013

Journal of Iberian Geology

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The continental Pennsylvanian Santa Susana Basin (SSB) is located along an important N-S strike shear zone (Santa Susana Shear Zone -SSSZ) that separates the Ossa-Morena and South Portuguese Zones (SW Portugal). This shear zone controlled the sedimentation of the basin and probably its post-sedimentary evolution. The lower (basal) unit is mostly conglomeratic and is known essentially from drill-hole data while the upper unit, that covers most of the current surface area, is composed by sandstones, shales and some coal beds. Fluvial sedimentary rocks seem to prevail, but evidences of lacustrine sedimentation can be found in restricted areas within the upper unit. Palynological data indicate that at least part of the sedimentation took place during the Early Kasimovian (Cantabrian) but the sporomorph content of different localities suggest that significantly older sediments (Late Moscovian -Early Bashkirian) may be present. Geometrical, structural, and cartographical evidences indicate that the SSB formed as a pull-apart basin along the SSSZ and was later partially uplifted during latest Varsican and Alpine orogenies.

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Section: Geological Settingmentioning

confidence: 99%

Palynology, Stratigraphy and Geometry of the Pennsylvanian continental Santa Susana Basin (SW Portugal)

Machado

Silva

Almeida

2013

Journal of Iberian Geology

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“…This compressive tectonic regime began in the Late Visean and caused enhanced uplift and subsequent erosion of the Ossa-Morena Zone and the palaeo-sea floor of the South Portuguese Zone by thrust stacking Pereira et al 2006;Jesus et al 2007;Rosas et al 2008). During the Visean an average exhumation rate of c. 2.6 km Ma −1 for the central areas of the Ossa-Morena Zone has been estimated using 40 Ar-39 Ar geochronology (Pereira et al 2012a).…”

Section: Discussion and Interpretation Of Resultsmentioning

confidence: 99%

“…These include (1) volcanism in the Iberian Pyrite Belt that is constrained to the Famennian (375 Ma) to Tournaisian (345 Ma) (Barrie et al 2002;Rosa et al 2009), (2) the Campo Frio Batholith in the South Portuguese Zone, which has yielded crystallization ages between 360 and 349 Ma (de la Rosa et al 2002;Rosas et al 2008), and (3) syncollisional magmatism and metamorphism on the SW border of the Ossa-Morena Zone, which is constrained to between 355 and 320 Ma (Santos et al 1987;Jesus et al 2007;Azor et al 2008). Additionally, a volcanic contribution from the Visean Toca da Moura and Cabrela volcano-sedimentary complexes of the Ossa-Morena Zone is possible (Pereira et al 2006). If we consider the rapid exhumation rates inferred for the Ossa-Morena Zone during the Visean (Pereira et al 2012a), it is possible that these igneous rocks were exhumed and eroded very quickly after their emplacement.…”

Section: Discussion and Interpretation Of Resultsmentioning

confidence: 99%

“…Flysch-type successions crop out on the northern and southern flanks of the Pulo do Lobo Suture Zone. These rocks are dated by palynomorphs as Frasnian to late Famennian in age (Pereira et al 2006(Pereira et al , 2008.…”

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confidence: 99%

“…The Baixo Alentejo Flysch Group comprises three formations, which are, from oldest to youngest, the Mértola, Mira and Brejeira formations (Figs 1 and 2). These units are dated as late Visean (345-326 Ma), Serpukhovian to early Bashkirian , and late Bashkirian to late Moscovian (315-307 Ma) respectively (Oliveira et al 1979;Korn 1997;Pereira 1999;Pereira et al 2006Pereira et al , 2008. The Mértola Formation comprises beds of greywacke of variable thickness interbedded with shales, siltstones, conglomerates and rare mudflows, with the greywacke beds exhibiting sedimentary structures typical of turbidites (Oliveira & Wagner Genthis 1983).…”

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confidence: 99%

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Detrital zircon geochronology of the Carboniferous Baixo Alentejo Flysch Group (South Portugal); constraints on the provenance and geodynamic evolution of the South Portuguese Zone

Rodrigues

Chew

Jorge

et al. 2015

JGS

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U–Pb detrital zircon data from the Baixo Alentejo Flysch Group in the South Portuguese Zone show significant age differences between formations. The Visean Mértola Formation and Serpukhovian to early Bashkirian Mira Formation are dominated by zircons in the 316–388 Ma age range, whereas the late Bashkirian to late Moscovian Brejeira Formation is dominated by zircons with an age range of 498–687 Ma. Detrital zircons spanning an age range of 0.9–1.1 Ga are present in the Brejeira Formation but are absent in the Mértola and Mira formations. Detrital zircon ages of the Mértola and Mira formations indicate provenance from an extra-basinal source (Ossa–Morena Zone) with a minor intra-basinal contribution (South Portuguese Zone). The abundant presence of detrital zircon with age ranges of 500–750 and 0.9–1.1 Ga in the Brejeira Formation suggests a sediment source from the Avalon–Meguma terranes with limited recycling from the SW Portugal Domain. The different inferred source areas for the Baixo Alentejo Flysch Group formations are attributed to the presence of a forebulge that was formed in Mid-Visean times during the foreland phase of the South Portuguese Zone. The forebulge acted as a physical barrier separating sub-basins that accumulated the Mértola–Mira and Brejeira sediments respectively.

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Maiaspora: a new miospore genus with enigmatic sculpture from the late Visean of European Russia

Mamontov

McLean

Орлова

et al. 2019

Papers in Palaeontology

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A new miospore genus, Maiaspora, is described from the upper Visean (middle Mississippian) of the southern wing of Moscow Syneclise (European Russia). Applying a combination of methods (optical light microscopy (LM), scanning‐electron microscopy, confocal laser microscopy (CLSM) and image analysis) to the same individual miospore specimens revealed a remarkable sculptural type for which we propose the new term ‘metareticuloid’. Metareticuloid sculpture is defined as a complex arrangement of muri with apiculate elements, polygonal lumina and circular scrobiculae at the base of the lumina. The discovery of fossil spores with metareticuloid sculpture allows the recognition of clear morphological differences between microreticulate and foveolate sculptures, which palynologists have historically had difficulty in separating. Virtual cross‐sections provided by CLSM show that miospores with metareticuloid sculpture display perfectly preserved, funnel‐shaped tunnels (like a gallery of cave stalactites) in the deep exospore. In contrast, miospores with microreticulate or reticulate and partly vermiculate sculpture lack such vertical tunnels (termed scrobiculae). The morphology of Maiaspora gen. nov. is considered in comparison with Microreticulatisporites (Knox non sensu Potonié & Kremp) Bhardwaj emended Oshurkova, Pseudoreticulatispora Bharadwaj & Srivastava emended Price & Foster, Vadaszisporites (Deák & Combaz) emended Juhász, Foveosporites Balme, Foveotriletes van der Hammen ex Potonié, Garotriletes Singh & Singh, Assamiasporites Mehrota & Sah, and Margotriletes Mehrota & Sah. The morphological conceptions of Microreticulatisporites and Foveotriletes are reinterpreted by numerical typification. The adaptative significance of metareticuloid sculpture is discussed in relation to modern and fossil spores, and in terms of harmomegathic mechanisms of angiosperm pollen.

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Palynostratigraphy of the Toca da Moura and Cabrela Complexes, Ossa Morena Zone, Portugal. Geodynamic implications

Cited by 49 publications

References 2 publications

Palynology, Stratigraphy and Geometry of the Pennsylvanian continental Santa Susana Basin (SW Portugal)

Palynology, Stratigraphy and Geometry of the Pennsylvanian continental Santa Susana Basin (SW Portugal)

Detrital zircon geochronology of the Carboniferous Baixo Alentejo Flysch Group (South Portugal); constraints on the provenance and geodynamic evolution of the South Portuguese Zone

Maiaspora: a new miospore genus with enigmatic sculpture from the late Visean of European Russia

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