Telmo Bento dos Santos

University of Lisbon

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Colombo Celso Gaeta Tassinari

Universidade de São Paulo

Paulo E. Fonseca

University of Lisbon

J. Munhá

University of Lisbon

Rita Solá

National Laboratory of Energy and Geology

João Mata

University of Lisbon

Inês Pereira

University of Coimbra

Joana Alexandra Ferreira

Universidade do Porto

Ahmed Ntarmouchant

Sidi Mohamed Ben Abdellah University

Pedro Cachapuz

Instituto Dom Luiz

M. Chichorro

Universidade Nova de Lisboa

Cooperative Institutions

University of Lisbon

National Laboratory of Energy and Geology

Instituto Dom Luiz

Sidi Mohamed Ben Abdellah University

IdMind (Portugal)

Instituto de Geociencias

University of Évora

Universidade do Porto

Instituto Geológico y Minero de España

National Institute of Engineering, Technology and Innovation

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Pitfalls and breakthroughs of petrological cooling rates based on mineral diffusion from granulites in Ribeira Belt, Brazil: can garnet – biotite diffusion mechanisms be used for anything?

Telmo Bento dos Santos J. Munhá Paulo E. Fonseca Colombo Celso Gaeta Tassinari

The use of software that removes dispersion from petrological cooling rates in migmatites and granulites from Ribeira Belt (Brazil) shows that these results are in broad agreement with thermochronological results based on integration of multiple isotopic systems: a) migmatites cooled rapidly from high temperatures, decreasing cooling rates through time; b) granulites endured low cooling rates at high temperatures, being followed by fast cooling, increasing cooling rates during retrogression.

Migmatite

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Geochemical data of the Ediacaran-Cambrian magmatism of Jbel Belkheit and Jbel Bou-Acila as evidence for the Hercynian Cycle Rift-to-Drift events in the Moroccan Central Hercynian Massif

Journal of African Earth Sciences (2023)

Hafid Smaïli Ahmed Ntarmouchant Telmo Bento dos Santos El Mehdi Jeddi Youssef Driouch

In the eastern sector of the Moroccan Central Hercynian Massif, Ediacaran and Cambrian magmatic rocks outcrop in the anticlines of Jbel Belkheit and Jbel Bou-Acila. These were emplaced between Pan-African deformed-sequences and Lower Palaeozoic levels in two successive volcanic series, separated by confirmed Lower Cambrian limestones: a) a lower series of Ediacaran age composed of felsic and intermediate volcanic rocks (rhyodacites and andesites). The rhyodacites are clearly calc-alkaline in character, comparable to rocks generated in an active margin orogenic context, whereas the andesites are transitional between calc-alkaline and tholeiitic, reflecting a change in the geotectonic context at the end of the Neoproterozoic; and b) an upper series of Cambrian age, composed of anorogenic tholeiitic basalts with massive flows in the bottom and pillow lavas in the top of the sequence. Although structural, petrographic and geochemical data rule out any genetic link between the felsic and the intermediate Ediacaran rocks, a geochemical link between the andesites and Cambrian basalts can be suggested. Both facies are thought to have been generated in an extensional context, although some of the orogenic features of their protolith are still present. In this sense, the Ediacaran andesites would be precursors of the Late Neoproterozoic – Early Cambrian rift rocks, leading to the eventual formation of Cambrian basalts. The latter facies were already emplaced in a clear extensional geodynamic context, and were probably generated by the same source that evolved during progressive crustal extension and thinning. This is confirmed by the evolution of Cambrian basalt morphostructures and geochemical characteristics from: i) massive flow basalts with a geochemical signature of intraplate tholeiites of E-MORB character; to ii) pillow lavas of oceanic tholeiites with a N-MORB character. This transition, therefore, marks the beginning of an oceanization process, which has never been described elsewhere in the Moroccan Cambrian.

Andesites

Massif

Felsic

10.1016/j.jafrearsci.2023.105104

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UPbGeoChronSPZ2024: U-Pb data from the South Portuguese Zone, Iberian Massif

Data in Brief (2024)

João Lains Amaral Rita Solá Telmo Bento dos Santos

Comprehensive isotopic databases of a particular geotectonic domain are valuable resources for geoscientists to develop geological models, such as paleogeographic and tectono-magmatic evolution models. The UPbGeoChronSPZ2024 is an open-access dataset of U-Pb isotopic analyses in minerals, primarily zircon, from igneous and siliciclastic rocks of the South Portuguese Zone, a Laurussian affinity terrain hosting a world-class metallogenic region, the Iberian Pyrite Belt. The dataset includes isotopic measurements and the location of the samples in WGS84 coordinates and it can be easily coupled with other regional or global datasets, making its value beyond its regional character. Furthermore, the dataset includes cutting-edge calculation methods for ages and discordances that allows geoscientists to test different outcomes.

Massif

Research article

10.1016/j.dib.2024.111089

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Geochemistry of mafic dyke swarms of Douar Eç-çour (High Atlas, Morocco): the farthest record of the Central Iapetus Magmatic Province (CIMP) into West African Craton

Warda El Moume Nasrrddine Youbi Andrea Marzoli Hervé Bertrand Moha Ikenne

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Geophysical characterization of the Cercal Paleozoic structure, Iberian Pyrite Belt, from a mineral exploration perspective

Journal of Applied Geophysics (2023)