Zelia Pereira

Zelia Pereira
Laboratório Nacional de Energia e Geologia | LNEG · Unidade de Geologia e Cartografia Geológica

PhD

About

205
Publications
56,118
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Introduction
Zélia Pereira currently works at the Laboratório Nacional de Energia e Geologia. PhD in Geosciences, and twenty four years working in palynostratigraphy. Responsible of the Palynology Lab LNEG, were develops several R&D projects and contracts with companies, and has been a participant in several cooperation projects with Angola (KWANZA BASIN), Mozambique (PALEOCLIMOZ), Brasil, Namibia, and several EU funded projects including EUOGA, EXPLORA, GEO-FPI. Mentor of several PhD and master thesis.
Additional affiliations
September 1997 - present
Laboratório Nacional de Energia e Geologia
Position
  • Researcher
Education
June 1995 - November 1995
Trinity College Dublin
Field of study
  • Palynostratigraphy
November 1992 - October 1996
University of Porto
Field of study
  • Palynostratigraphy
October 1987 - July 1991
University of Porto
Field of study
  • Geology

Publications

Publications (205)
Article
Numerosos estudos palinoestratigráficos, realizados sobretudo na Zona Sul Portuguesa, iniciados durante os anos 90 do século passado e que se expandiram durante os anos 2000 com a extensão da investigação para outras bacias sedimentares, permitiram detalhar bioestratigraficamente diversas sequências estratigráficas do País. Com o objetivo de preser...
Article
New palynological results from the Gafo Formation (southern sector of the Pulo do Lobo Domain, South Portuguese Zone) are integrated with recently studied sections and drillholes from the Portuguese and Spanish sectors. A total of 44 samples were studied, 27 of which were positive for palynomorph taxonomy. This research revealed well preserved paly...
Conference Paper
Full-text available
The Lusitanian Basin is located in central western Portugal and is mainly composed of Jurassic sediments. The macro and microfossil biostratigraphy of this depocentre is well studied, but palynological works are scarce. We address this with a high-resolution palynostratigraphic study of a Lower and Middle Jurassic succession of the Lusitanian Basin...
Article
In this work, we report the first palynological age for the base strata of the Silves sandstones of the Silves Group in the Algarve Basin, located in Southern Portugal. The group is the oldest sedimentary unit of the Algarve Basin and was deposited unconformably over late Pennsylvanian turbidites of the Mira Formation, which were folded and faulted...
Article
A detailed palynostratigraphic and palynofacies analysis, associated with a lithological control, was carried out on eleven outcrop samples from the Quifangondo Formation in the Cabo Ledo (Petrofina) section, Kwanza Basin, Angola. The samples yield relatively diverse and well-preserved terrestrial and marine palynomorphs. A systematic analysis of t...
Conference Paper
This research presents the first detailed study based on palynology, palynofacies and lithofacies of the Arrifes section, a Lower Cretaceous outcrop succession from the Algarve Basin. 48 samples were collected and studied, and the first assessments of age and palaeoenvironmental interpretations were established. The palynological data suggest that...
Article
Full-text available
This study focuses on the thermal maturity of Permian deposits from the Zagros Basin, Southwest Iran, employing both optical methods (Thermal Alteration Index, Palynomorph Darkness Index, Vitrinite Reflectance, UV Fluorescence) and geochemical analyses of organic matter (Rock Eval Pyrolysis and MicroRaman spectroscopy) applied to the Faraghan Forma...
Poster
Full-text available
A mainly Middle Jurassic composite succession with 129 samples was examined palynologically. This spans the Toarcian–Aalenian transition to the lowermost Bathonian, exposed at Cabo Mondego (includes the GSSP and the ASSP for the Bajocian and Bathonian stages respectively) and São Gião in the northern Lusitanian Basin, western Portugal. The main goa...
Article
This work introduces one of the first palynostatigraphic study conducted on formations from the Eocene and overlying lowermost Miocene successions (Cunga and Quifangondo formations) exposed in the Onshore Kwanza Basin, Angola. To improve the Cunga and Quifangondo formations age, new biostratigraphic correlations and palaeoenvironmental interpretati...
Article
New evidence is presented on the Triassic–Jurassic boundary in the northern Lusitanian Basin, Portugal, based on miospore assemblages from a composite Upper Triassic to Lower Jurassic succession of the Silves Group. The latter comprises, from base to top, the Conraria, Penela, Castelo Viegas and the Pereiros formations. Three informal palynological...
Article
This contribution is an overview of the Early Jurassic dinoflagellate cysts of the Lusitanian Basin in Portugal, with particular emphasis on the effects of the Jenkyns Event (Toarcian Oceanic Anoxic Event – T-OAE) on the evolution of this planktonic group. We review and discuss data from 214 samples from six Lower Jurassic successions (upper Sinemu...
Article
A Miocene succession exposed at the Cabo Ledo and Miradouro da Lua sections in the Onshore Kwanza Basin, Angola, was examined for palynology. Palynomorphs of preliminary late Miocene age identified are presented herein. The upper part of the Quifangondo Formation is dated as middle Tortonian in age based on the co-occurrence of the pollen grain Fen...
Article
A multidisciplinary study involving lithofacies analysis, palynofacies, and palynology is presented for the Muarádzi Sub-basin. This sub-basin is part of the Moatize-Minjova Basin (MMB), an important Karoo aged coalfield in Mozambique. A total of 99 core samples from 3 coal exploration boreholes (DW11, DW21, and DW141) were analysed and all the suc...
Article
Full-text available
The recently discovered massive and stockwork sulphide mineralization of Semblana-Rosa Magra and Monte Branco, situated ESE of the Neves–Corvo volcanogenic massive sulphide (VMS) deposit in the Iberian Pyrite Belt (IPB) is presented. Geological setting and tectonic model is discussed based on proxies such as palynostratigraphy and U–Pb zircon geoch...
Article
Full-text available
A geological correlation between Neves-Corvo (NC) and Pomarão antiforms is attempted. These regional scale major sequences are easily correlated but, at local scale, facies and age differences stand out. Stratigraphy includes: i) the Phyllite-Quartzite Group with identical paleogeography setting and similar late Famennian ages for uppermost levels...
Article
Full-text available
New palynostratigraphic data were obtained from phyllites interbedded with quartzwackes of the Vale de Parreiras Formation, located to the south of the Grândola Fault in the Azinheira de Barros region, Portugal. The studied outcrops are located in the eastern bank of the Sado river. A mid-late Famennian age has been assigned based on significant pr...
Cover Page
Full-text available
Region-is a research project coordinated by the Laboratório Nacional de Energia e Geologia (LNEG) together with the Laboratório Hércules (University of Évora) and Somincor/Lundin Mining (Neves-Corvo mine company), an Op ALT20-03-0145-FEDER-000025, funded by the Alentejo 2020, Portugal 2020 and European Union (ERDF). The project´s major goal was the...
Article
A detailed palynostratigraphic study of two Somincor/Lundin Mining exploration drill holes intercepting the Phyllite-Quartzite (PQ) Formation in the geological basement of the Neves-Corvo mine region (Portuguese sector of the Iberian Pyrite Belt – IPB) allowed to first recognise the oldest ages for this formation in this region, ranging from midGiv...
Data
A geological correlation between Neves-Corvo (NC) and Pomarão antiforms is attempted. These regional scale major sequences are easily correlated but, at local scale, facies and age differences stand out. Stratigraphy includes: i) the Phyllite-Quartzite Group with identical paleogeography setting and similar late Famennian ages for uppermost levels...
Article
This research presents the palynostratigraphy of organic-rich shales from the Irati and the Corumbataí formations, Paraná Basin (PB), Southeastern Brazil, as part of an unconventional hydrocarbon source rock and CO2 reservoir assessment study. Thirty-four samples from the Corumbataí Formation and the Assistência Member of the Irati Formation were c...
Conference Paper
Full-text available
A regional South Portuguese Zone (SPZ) mapping and stratigraphic program in SW Iberia is presented. It is being developed by LNEG and IGME and financed by the GEO_FPI Project (www.geo-fpi.eu). The SPZ is the southwesternmost geotectonic unit of the Variscan Orogeny in Iberia. The following domains are considered: Pulo do Lobo (early Frasnian -late...
Preprint
Full-text available
Dinoflagellates, together with diatoms and coccolithophores, form a major element of the marine eukaryotic phytoplankton, and are significant primary producers. Based on the fossil record, dinoflagellates appeared in Middle Triassic and during the Early Jurassic (late Pliensbachian) and underwent an important evolutionary radiation episode, with th...
Preprint
Dinoflagellates, together with diatoms and coccolithophores, form a major element of the marine eukaryotic phytoplankton, and are significant primary producers. Based on the fossil record, dinoflagellates appeared in Middle Triassic and during the Early Jurassic (late Pliensbachian) and underwent an important evolutionary radiation episode, with th...
Chapter
Synorogenic basins formed in all lithospheric units involved in the Variscan orogeny, i.e. the Gondwanan and Laurussian continental margins and also in the oceanic realm. However, examples of the latter are only preserved in SW Iberia. On the other hand, synorogenic deposits of the Gondwanan foreland are only preserved in NW Iberia, whereas remains...
Chapter
Full-text available
The South Portuguese Terrane encompasses three major pre-orogenic mega-sequences: the Phyllite-Quartzite Group and the Tercenas Fm., the Volcanic-sedimentary Complex, and the Carrapateira Group, all three overlain by the syn-orogenic Baixo Alentejo Flysch Group, dealt with in Chap. 11. During the Mid-Late Devonian all the three mega-sequences belon...
Chapter
Full-text available
Progressive opening of the Rheic Ocean led to the drifting away of one or several ribbon terranes, generally ascribed to Avalonia, and inaugurated a passive margin stage on the newly formed margin of NW Gondwana. In Iberia, which remained on the Gondwanan side of the ocean, the rift to drift transition is recorded in the Ossa Morena Zone in latest...
Chapter
The geology of SW Iberia records a sequence of geologic events from the Cambrian-Early Ordovician rifting and subsequent passive margin development along the southern flank of the Rheic Ocean, to onset of oblique (sinistral) subduction in the Devonian, followed by oblique terrane accretion, ocean closure/continental collision and orogenic collapse....
Chapter
The geology of SW Iberia records a sequence of geologic events from the Cambrian-Early Ordovician rifting and subsequent passive margin development along the southern flank of the Rheic Ocean, to onset of oblique (sinistral) subduction in the Devonian, followed by oblique terrane accretion, ocean closure/continental collision and orogenic collapse....
Article
Permian-Triassic ages have been identified for the first time in the Karoo Supergroup of the N’Condédzi sub-basin, Moatize-Minjova Coal Basin, Mozambique. This transition was identified in a coal exploration borehole that penetrated the Matinde and Cádzi formations. The top of the Matinde Formation is dated latest Permian (Lopingian), and the Cádzi...
Article
The detailed palynostratigraphic study of four boreholes in theMuarádzi sub-basin,Moatize-Minjova Coal Basin (MMCB) southeast of Moatize, allowed the assignment of relative ages to the stratigraphic units. Three assemblageswere studied in detail and are assigned to the Lopingian. Assemblage L1 is characterized by the rich occurrence of Guttulapolle...
Article
Seven coal seams were sampled from several mines and outcrops of the Rio Bonito Formation, Bonito and Barro Branco coal seams, in the coal mining region of Criciúma, Paraná Basin, Santa Catarina State (Brazil), for a detailed palynostratigraphic study. The coal seams sampled yield abundant, diverse and moderately to well preserved palynological ass...
Article
Kerogen concentrates obtained from Lopingian (Late Permian) to Upper Triassic mudrock lithologies of seven coal exploration boreholes, drilled in the Moatize – Minjova Coal Basin (N'Condédzi sub-basin, Mozambique), were studied by means of vitrinite reflectance (VR), spore fluorescence and spore colour, in order to constrain the thermal history and...
Conference Paper
Full-text available
A Formação Quifangondo (Miocénico), pertencente à Bacia do Kwuanza, tem sido investigada para estudos de palinoestratigrafia. Esses estudos permitem melhorar o conhecimento bioestratigrafico e paleoambiental, assim como conhecer com rigor a sua idade. No presente trabalho, foram estudadas 8 amostras de argilitos, as quais foram recolhidas em 6 aflo...
Conference Paper
Full-text available
Este estudo tem como objetivo a análise palinológica do Triásico Superior e Jurássico Inferior (Hetangiano) da Bacia Lusitânica, materializado no Grupo de Silves, (ver, por exemplo, Soares et al., 2012) aflorante no setor Coimbra – Penela (fig. 1), Centro - Oeste de Portugal. Neste setor da Bacia Lusitânica, as unidades desta idade foram formalment...
Article
Full-text available
This work is focused on the turbiditic sediments from the Carboniferous Baixo Alentejo Flysch Group (BAFG) in the South Portuguese Zone, an external zone of the Iberian Variscides. The aim of this work is to constrain the provenance and tectonic setting of these sediments in a context of a complex evolution of SW Iberian Variscides. For this purpos...
Article
Full-text available
We present palynological results from the northern sector of the Pulo do Lobo Domain, combining sections studied in Portugal and Spain. A total of 139 samples were studied, of which 56 are positive for palynology. The first age determination for the Pulo do Lobo Formation was achieved, indicating a mid-Frasnian age (Verrucosisporites bulliferus and...
Conference Paper
The Lusitanian Basin is located in central western Portugal and is filled mainly with marine Jurassic sediments. Here, the Lower Jurassic is particularly well developed and characterized by marl-limestone alternations. Dinoflagellate cysts are reliable palaeoecological indicators and the goal of this work is to describe the pre and post T-OAE dinof...
Conference Paper
Full-text available
In the north of the Lusitanian Basin, in the Coimbra-Penela sector, the Silves Group includes, from base to the top, the Conraria, Penela, Castelo Viegas and Pereiros formations. The three first units are of Late Triassic age, while the Pereiros Formation is of Early Jurassic (Hettangian) age. We herein present a palynostratigraphic study stablishe...
Conference Paper
Full-text available
Karoo sedimentary rocks are well represented in Mozambique in various sedimentary basins, located along the Zambezi River valley in Tete Province, Central-West Mozambique. The Moatize-Minjova Basin is one of these basins which sedimentary successions are regarded as the key stratigraphic sections for the Lower Karoo Supergroup in Mozambique, includ...
Article
A composite largely Middle Jurassic succession spanning the Toarcian–Aalenian transition to the lowermost Bathonian exposed at Cabo Mondego and São Gião in the northern Lusitanian Basin, western Portugal, was examined palynologically. The 129 samples are correlated to ammonite biozones spanning Pleydellia aalensis to Zigzagiceras zigzag. The Cabo M...
Conference Paper
Full-text available
The middle Albian-lower Turonian Western Continental Margin of the Iberia stands out in the post-rift record of the Western Iberian Continental Margin by its marine character and abundance in fossils. In this study the stratigraphy and palynology of the basal sequences recorded in Nazaré, one of its main outcrops, are focused with emphasis on the t...
Conference Paper
A análise palinológica de amostras recolhidas em duas sondagens (>1 100 m NK30B-1 e SJ32), localizadas na área mineira de Neves-Corvo, em sedimentos da Formação Filito-Quartzítica (FQ), Faixa Piritosa Ibérica, permitiu observar associações de palinomorfos (miosporos e acritarcas), bem preservadas e com idade assinaladas ao Givetiano médio e ao Fras...
Preprint
A comprehensive investigation of the Early Jurassic stratigraphical palynology of the Lusitanian Basin in western Portugal was undertaken, with most emphasis placed on dinoflagellate cysts. A total of 214 samples, from an upper Sinemurian to upper Toarcian composite section based on six successions, were examined. The Sinemurian material examined w...
Article
A comprehensive investigation of the Early Jurassic stratigraphical palynology of the Lusitanian Basin in western Portugal was undertaken, with most emphasis placed on dinoflagellate cysts. A total of 214 samples from an upper Sinemurian to upper Toarcian composite section based on six successions were examined. The Sinemurian material examined was...
Article
Palynomorphs from a lower Carboniferous siliciclastic succession in the Serra de S. Mamede Syncline structure, Portalegre region, Portugal, are documented, providing new information to the revision of the 1:200.000 Geological Map (Map 6) that is been completed by the Portuguese Geological Survey (LNEG). This work was part of the first author Ph.D....
Article
The uppermost Pliensbachian and lower Toarcian (Lower Jurassic) succession exposed at Peniche in the central part of the Lusitanian Basin, western Portugal, was examined for palynomorphs. The 45 samples span the Emaciaticeras emaciatum, Dactylioceras polymorphum and Hildaites levisoni ammonite biozones (ABs), and the succession includes the Global...
Conference Paper
The Lusitanian Basin is a marginal depocentre located in central western Portugal, and the basin fill is mainly Jurassic. The uppermost Pliensbachian and Toarcian succession comprises the Lemede and São Gião formations, characterized by marl-limestone alternations. The Cabo Carvoeiro Formation constitutes the Toarcian at Peniche. In the Lusitanian...
Poster
During the Callovian, dinoflagellate cysts underwent a significant diversification, where many genera and species emerged. The main aim of this work is to document the Callovian dinoflagellate cyst record in the Cabo Mondego section, Lusitanian Basin, Portugal, in order to contribute to the biostratigraphy and palaeobiology/palaeoecology of this ar...
Conference Paper
Full-text available
Zircon geochronology in the rhyolite units related with the Neves-Corvo VMS deposit combined with chemostratigraphy-based classification indicates three different volcanic stages acting from late Famennian to Tournaisian times. The first two are space-related and with similar volcanic facies but chemically distinct; the third episode, chemically ak...
Article
The Mississippian volcano-sedimentary complex in the Toca da Moura – Cabrela areas represents remnants of intra-volcanic marine sedimentary basins, formed during the collision between the Ossa Morena Zone with the South Portuguese Zone. These rock units are unconformably overlain by the Pennsylvanian intramontane coal-bearing Santa Susana Basin. Vi...