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Introduction
Zélia Pereira works at the LNEG (Geological Survey). PhD in Geosciences, 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.
Skills and Expertise
Additional affiliations
September 1997 - present
Education
June 1995 - November 1995
November 1992 - October 1996
October 1987 - July 1991
Publications
Publications (248)
A new fern fossil-species Acitheca machadoi sp. nov. is erected under the family Psaroniaceae (Marattiales), based on adpression fossil remains of fertile foliage from the Monsarros Formation (upper Stephanian C, upper Gzhelian) of the Buçaco Carboniferous Basin, in western central Portugal. Acitheca machadoi comprises relatively narrow and long fe...
Detrital zircon U-Pb geochronology of the Moatize and N’Condédzi coalfields in the Zambezi Karoo Basin of Mozambique provides key insights into the regional provenance, sediment dispersal pathways and basin evolution. Borehole cores from the two coalfields reveal a stratigraphy spanning the early Roadian (middle Permian) to the Carnian (Upper Trias...
Over a century after Paul Choffat's initial description of the Arrifes section, a pioneering figure in Portuguese geology who highlighted the vertical arrangement of the strata and the occurrence of a limestone bed containing a copious quantity of orbitolinid tests, this upper Barremian–lower Aptian stratigraphic succession, which is fully exposed...
This paper presents the results of palynostratigraphic studies in the Silves Group in the Algarve Basin, Portugal. From bottom to top comprises the Silves Sandstones, the Silves Marl-Carbonate Evaporitic Complex, and the Volcano-Sedimentary Series. This study aims to detail the age of the Silves Group, bracketing the Triassic-Jurassic transition, u...
This research examines palynomorph assemblages preserved in sediments of the Iberian Pyrite Belt (IPB) that
host the Neves-Corvo massive sulfide deposit and its importance for mineral exploration. The sediments belong
to the Neves Formation, characterized by black shales and minor occurrences of siltstones and cherts, indicative of reduced environm...
This research examines palynomorph assemblages preserved in sediments of the Iberian Pyrite Belt (IPB) that host the Neves-Corvo massive sulfide deposit and its importance for mineral exploration. The sediments belong to the Neves Formation, characterized by black shales and minor occurrences of siltstones and cherts, indicative of reduced environm...
Palynological investigations in the Sumbe region of the Kwanza Basin, Angola, have identified Albian to Turonian assemblages in four sections of the Quissonde Facies of the Mucanzo, Cabo Ledo, and Itombe formations. These studies aimed to determine their biostratigraphic ages and infer paleoenvironmental, paleoclimatic, and paleogeographic models....
In this study, we present dinoflagellate cyst data from the uppermost lower Bathonian to lowermost Callovian strata from the Cabo Mondego section, in the northern part of the Lusitanian Basin, Portugal. This Middle Jurassic succession comprises the type section of the Cabo Mondego Formation. We document significant dinoflagellate cyst occurrences a...
The Silves Group of the Lusitanian Basin in Portugal represents the initial infill of the continental rifting basins that formed during the breakup of northern Pangaea regions. Evaporites, especially halite, mark the transition from continental to marine settings and the beginning of the deposition in passive margin basins. This work presents the r...
Este trabalho apresenta resultados palinostratigráficos que permitem detalhar a idade das unidades do Grupo de Silves na Bacia do Algarve. O Grupo de Silves constitui a unidade sedimentar mais antiga desta bacia e assenta discordante sobre os turbiditos do Carbonífero superior da Formação Brejeira, dobrados e fraturados durante a Orogenia Varisca....
Based on drill hole sampling and sedimentary rock dating by palynology, the present research focuses on the palynostratigraphic events established in the key geological section of Guedelhinha–Lançadoiras–Algaré located in the Portuguese Neves–Corvo mine region, Iberian Pyrite Belt.
The age data allow detailing the lithostratigraphic sequence and f...
A secção estratigráfica dos Arrifes (Albufeira, Algarve) foi estudada, em detalhe, para biostratigrafia de carofitas. Este estudo permitiu-nos reconhecer duas associaçõoes distintas: i) A primeira, composta por Echinochara lazarii, Atopochara trivolvis triquetra, A. trivolvis trivolvis, Clavator grovesii jiuquanensis, Clavator harrisii harrisii e C...
The Moatize-Minjova Basin (Mozambique) includes the coal-bearing N’Condédzi sub-basin. Its
wide-ranging sedimentary succession makes this a key location for a better understanding of
paleoenvironmental changes throughout the Permo-Triassic. Thus, a review of the existing
palynostratigraphy (borehole CIMT-14) combined with 𝛿13Corg variation and new...
A presente investigação mostra os principais eventos palinoestratigráficos identificados na seção geológica de Guedelhinha-Lançadoiras-Algaré, localizada na região da mina de Neves-Corvo, Faixa Piritosa Ibérica. A idade estabelecida permitiu detalhar a sequência litoestratigráfica e compreender a grande complexidade estrutural, representando um imp...
The Moatize Coalfield belongs to a network of continental Karoo basins of central Mozambique, known as the Zambezi Basin. Palynological and sedimentological studies were performed on four coal exploration boreholes to determine the age, depositional settings, and overall geological evolution of its extensive coal deposits. Clastic formations recogn...
O Grupo Filito-Quartzítico (GFQ) é considerado o substrato siliciclástico da Faixa Piritosa Ibérica (FPI), aflorando nas antiformas de Pomarão-Puebla de Guzmán, Valverde, Neves-Corvo– Rosário, Lousal–Caveira, São Francisco da Serra e Cercal. No setor norte da FPI o GFQ está presente em estruturas alóctones em São Domingos, Mértola, Alcaria Ruiva, S...
The South Portuguese Zone (SPZ) 1/200 000 and 1/400 000 scale maps and stratigraphic program in SW Iberia is presented by a LNEG-IGME consortium and funded by GEO_FPI/Interreg-POCTEP. The 1/200 000 mapped area corresponds to the border area and is based on previous work (Folha 8 and Sevilla-Puebla de Guzmán maps). The 1/400 000 map covered a larger...
The region of Mértola, Serpa, Moura and Barrancos, located in the middle section of the Guadiana River presents a distribution of geosites of great scientific value, constituting the argument to a future Geopark. The studied territory includes the Ossa-Morena (OMZ) and South Portuguese (SPZ) geological sequences, the tectonic boundary between these...
Quatro sondagens realizadas na Bacia Carbonífera de Moatize (Moçambique) foram alvo de estudos palinoestratigráficos e paleoambientais, permitindo a determinação da idade da sucessão estratigráfica do Karoo inferior desta bacia. Os dados forneceram, também, conhecimentos sobre a idade das camadas de carvão, evolução dos ambientes sedimentares e con...
Este trabalho mostra dados palinostratigráficos que permitem aperfeiçoar a idade do Grupo de Silves na Bacia do Algarve. O Grupo de Silves constitui a unidade sedimentar mais antiga desta bacia e foi depositado de forma discordante sobre os turbiditos do Carbonífero superior da Formação Brejeira, dobrados e falhados durante a Orogenia Varisca. Os n...
This work shows palynostratigraphic data that allow to improve the age of the Silves Group in the Algarve Basin The Silves Group constitutes the oldest sedimentary unit of this basin and was deposited discordantly over the Upper Carboniferous urbidites of the Brejeira Formation, folded and faulted during the Variscan Orogeny The new data obtained a...
The Arrifes section (Algarve Basin, Southern Portugal) has been studied from the viewpoint of charophyte biostratigraphy. The previous sedimentological studies in this section showed that it is built of the interbedding of continental and marine facies that contain both marine and continental palynomorphs (pollen, spores, and dinoflagellates), prov...
Integrated sedimentological, palynological, and palynofacies analyses of the Arrifes section in the central Algarve Basin (southern Portugal) provided new information on the age and environments of this Lower Cretaceous sequence. The sedimentary succession at the Arrifes section consists of fossiliferous interbedded limestones, marly limestones, an...
Este trabalho relata a primeira idade palinológica para a base dos Arenitos de Silves do Grupo de Silves na Bacia do Algarve. O Grupo de Silves é a unidade sedimentar mais antiga da Bacia do Algarve e foi depositado em discordância angular sobre turbiditos do Carbónico superior da Formação Brejeira, dobrados e falhados durante a Orogenia Varisca. O...
Samples were collected for palynological studies in the Lusitanian (LB) and Algarve (AB) basins, Portugal. These samples aimed to study the Triassic - Jurassic transition in Portugal in the Silves Group.
Thirty-nine samples were collected in LB and twenty-five in AB, yielding moderate to well preserved and moderate preserved sporomorphs, respectiv...
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...
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...
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...
Samples were collected for palynological studies in the Lusitanian and Algarve basins, Portugal. These samples aimed to study the Triassic-Jurassic transition in Portugal, more specifically, the Upper Triassic-Lower Jurassic of the Silves Group. In the Lusitanian Basin (LB), three informal biozones were documented and compared with the palynozones...
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...
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...
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...
This work reports the first palynological age for the base strata of the Silves Sandstones of the Silves Group in the Algarve Basin, one of the Mesozoic sedimentary basins that border the Iberian Massif, located in Southern Portugal. The Silves Group is the oldest sedimentary unit of the Algarve Basin and was deposited unconformably over late Penns...
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...
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...
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...
The first palynological age for the base strata of the Silves Sandstones of Silves Group in the Algarve Basin. Deposited unconformably over late Pennsylvanian turbidites of the Mira formation, folded and faulted during the Variscan Orogeny, is the oldest sedimentar unit of the Algarve Basin. The detritical red bed sucession representes the earliest...
A Bacia do Algarve, localizada no sul de Portugal, é uma bacia sedimentar Meso-Cenozoica, associada às fases de rifting que deram origem à abertura do Oceano Atlântico Norte e Central, durante a separação inicial da Pangeia. A sedimentação iniciou-se com a deposição dos Arenitos de Silves, em discordância angular, sobre fácies marinhas do Carbonífe...
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...
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...
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...
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...
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...
We studied the miospore assemblages from a composite Upper Triassic to Lower Jurassic succession of the Silves Group near Coimbra The latter comprises, from base to top, the Conraria, Penela, Castelo Viegas and the Pereiros formations Three informal palynological zones have been documented and compared with coeval palynozones from West and South Eu...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....
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....
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...
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...
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...
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...
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...