António Mateus

University of Lisbon

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Jorge Figueiras

University of Lisbon

Mário A. Gonçalves

IdMind (Portugal)

Colombo Celso Gaeta Tassinari

Universidade de São Paulo

Fernando A. Monteiro Santos

University of Lisbon

J. Munhá

University of Lisbon

A. Ribeiro

Universidade Federal do Rio de Janeiro

Ana P. Jesus

University of Lisbon

F.O. Marques

University of Lisbon

J. Pous

Universitat de Barcelona

Paulo E. Fonseca

University of Lisbon

Cooperative Institutions

University of Lisbon

Instituto Dom Luiz

National Laboratory of Energy and Geology

National Institute of Engineering, Technology and Innovation

Centre National de la Recherche Scientifique

University of Évora

Instituto de Geociencias

Instituto Geológico y Minero de España

Universidade do Porto

University of Coimbra

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Delimiting geochemical anomalies in the exploration of covered deposits with multifractal methods and using stream sediment data from the Iberian Pyrite Belt, Southwest Iberia

Ore Geology Reviews (2019)

Mário A. Gonçalves António Mateus

Flysch

Basement

10.1016/j.oregeorev.2019.103018

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Citations (17)

Pb-Nd-Sr Isotope Geochemistry of Metapelites from the Iberian Pyrite Belt and Its Relevance to Provenance Analysis and Mineral Exploration Surveys

Economic Geology (2021)

Filipa Luz António Mateus Ezequiel Ferreira Colombo Celso Gaeta Tassinari Jorge Figueiras

Abstract The Iberian Pyrite Belt is a world-class metallogenic district developed at the Devonian-Carboniferous boundary in the Iberian Variscides that currently has seven active mines: Neves Corvo (Cu-Zn-Sn) and Aljustrel (Cu-Zn) in Portugal, and Riotinto (Cu), Las Cruces (Cu), Aguas Teñidas (Cu-Zn-Pb), Sotiel-Coronada (Cu-Zn-Pb), and La Magdalena (Cu-Zn-Pb) in Spain. The Iberian Pyrite Belt massive sulfide ores are usually hosted in the lower sections of the volcano-sedimentary complex (late Famennian to late Visean), but they also occur in the uppermost levels of the phyllite-quartzite group at the Neves Corvo deposit, stratigraphically below the volcano-sedimentary complex. A Pb-Nd-Sr isotope dataset was obtained for 98 Iberian Pyrite Belt metapelite samples (from Givetian to upper Visean), representing several phyllite-quartzite group and volcano-sedimentary complex sections that include the footwall and hanging-wall domains of ore horizons at the Neves Corvo, Aljustrel, and Lousal mines. The combination of whole-rock Nd and Sr isotopes with Th/Sc ratios shows that the siliciclastic components of Iberian Pyrite Belt metapelites are derived from older quartz-feldspathic basement rocks (–11 ≤ εNdinitial ≤ –8 and (87Sr/86Sr)i up to 0.727). The younger volcano-sedimentary complex metapelites (upper Tournaisian) often comprise volcanic-derived constituents with a juvenile isotopic signature, shifting the εNdi up to +0.2. The Pb isotope data confirm that the phyllite-quartzite group and volcano-sedimentary complex successions are crustal reservoirs for metals found in the deposits. In Neves Corvo, where there is more significant Sn- and Cu-rich mineralization, the higher (206Pb/204Pb)i and (207Pb/204Pb)i values displayed by phyllite-quartzite group and lower volcano-sedimentary complex metapelites (up to 15.66 and 18.33, respectively) suggest additional contributions to the metal budget from a deeper and more radiogenic source. The proximity to Iberian Pyrite Belt massive sulfide ore systems hosted in metapelite successions is observed when (207Pb/204Pb)i >15.60 and Fe2O3/TiO2 or (Cu+Zn+Pb)/Sc >10. These are important criteria that should be considered in geochemical exploration surveys designed for the Iberian Pyrite Belt.

Phyllite

Viséan

Basement

10.5382/econgeo.4869

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Citations (6)

Magnetic Properties of the Foum-Zguid Dyke (south Morocco)

AGU Fall Meeting Abstracts (2003)

P. M. Silva J. M. Miranda F.O. Marques Bernard Henry António Mateus

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The Earth as a Dynamic Open System

Springer eBooks (2002)

A. Ribeiro António Mateus

geodynamics

Lithospheric flexure

10.1007/978-3-642-56396-6_5

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EVOLVING FLUID CIRCULATION WITHIN THE VARISCAN BEJA-ACEBUCHES OPHIOLITE COMPLEX (SE, PORTUGAL)

Ofioliti (1999)

António Mateus Jorge Figueiras Mário A. Gonçalves Paulo E. Fonseca

The Beja-Acebuches Complex is an extremely dismembered ophiolite sequence incorporated in the Variscan South Iberian Suture, representing a small marginal (back-arc) basin formed during subduction under the Iberian Terrane of normal oceanic crust to the south. Widespread textural evidence for hightemperature (800-900 oC) recrystallization of the basal and intermediate sections of the ophiolite sequence under an anisotropic stress field, suggests that these rocks were obducted before their total consolidation. The later history of this Complex reflects mainly Variscan metamorphism, that peaked at amphibolite facies, and its subsequent waning stages (during which the prevalent hydration of peridotites took place). The final stages of the retrograding path occurred at temperatures below 300 oC and are mainly ascribable to large-scale and repeated H2O, CO2 and (subordinate) SiO2 introduction into the system through WNW-ESE left-handed vertical shear zones, reactivated under brittle conditions with a left-lateral thrusting movement. This large volume, extremely well focused, fluid inflow generally induced very intense carbonatization of the adjoining rocks, with almost total destruction of their original mineralogy and textures and deposition of ankerite + dolomite ± siderite ± magnesite in subsidiary distensive structures. When affecting serpentinized peridotites, this metasomatic process leads to deserpentinization with development of strongly silicified carbonate aggregates. Later hydrothermal events are typically related to the precipitation of microcrystalline quartz and/or calcite in late veins and veinlets. Fluids circulating through the shear zones must have been quite pure, slightly acidic H2O-CO2 mixtures, whose very scarcity in metals promoted the hydrolysis of primary minerals and the removal of Al as aqueous-complexes. The origin of these fluids is believed to be related mainly to degassing of the autochthonous carbonate/schist units during Variscan metamorphism and the Beja Igneous Complex intrusion.

Metasomatism

Overprinting

10.4454/ofioliti.v24i2.107

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Citations (18)

Crustal Imaging of Portugal Mainland Using Magnetotelluric data

Zenodo (CERN European Organization for Nuclear Research) (2022)

Pedro Baltazar‐Soares F.J. Martínez-Moreno Joana Alves Ribeiro Fernando A. Monteiro Santos Paulo Ribeiro

Edi files of 21 MT stations acquired during the project MAG-GIC (PTDC/CTA-GEO/31744/2017) funded by national funds through FCT (Foundation for Science and Technology, I.P.)

Magnetotellurics

Mainland

10.5281/zenodo.7147543

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Citations (1)

Geochemical anomaly separation by multifractal modelling

Journal of Geochemical Exploration (2001)

Mário A. Gonçalves António Mateus Vítor M. J. Oliveira

Anomaly (physics)

Multifractal system

Mineral exploration

10.1016/s0375-6742(01)00156-x

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Citations (151)

Magnetotelluric measurements in SW Iberia: New data for the Variscan crustal structures

Geophysical Research Letters (2005)

Eugénio P. Almeida Fernando A. Monteiro Santos António Mateus Wiebke Heise J. Pous

Thirty new MT soundings were carried out in SW Iberia allowing the investigation of the lateral continuity of some major structures and lithological features that are believed to control decisively the deep architecture of the Ossa Morena Zone belts. Results of the two‐dimensional inversion of the data reveal high‐conductivity zones in the middle‐lower crust, interpreted as the signal of a granulitic basement with grain‐boundary interconnected films of graphite. The resistive features, located preferentially in the upper‐middle crust, are ascribable to igneous complexes of variable age.

Magnetotellurics

Basement

Massif

Upper crust

10.1029/2005gl022596

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Citations (28)

U-Pb SHRIMP zircon dating of high-grade rocks from the upper allochthonous terrane of Bragança and Morais massifs (NE Portugal): geodynamic consequences

Anais (2012)

António Mateus Angela E. Ribeiro J. Munhá Colombo Celso Gaeta Tassinari Kei Sato

Massif

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Nature and mechanism of ilmenite alteration: a Mössbauer and X-ray diffraction study of oxidized ilmenite from the Beja-Acebuches Ophiolite Complex (SE Portugal)

Mineralogical Magazine (2002)

João C. Waerenborgh Jorge Figueiras António Mateus Mário A. Gonçalves

Abstract Ilmenites from the least-altered rocks of the Beja-Acebuches Ophiolite Complex (SE Portugal), with low Ti values and excess Fe, despite rare optical evidence of hematite exsolution, were studied by 57 Fe Mössbauer spectroscopy and X-ray diffraction. According to single-crystal XRD the sequence of alternate layers characteristic of the ideal ilmenite structure is preserved, the excess Fe being accommodated in the Ti layers. No superparamagnetic oxides were detected by 57 Fe Mössbauer spectroscopy. The typical spectra of bulk αFe 2 O 3 and of Fe 3+ -containing ilmenite, in the paramagnetic state above 49 K and magnetically ordered at 6 K, are observed. The average degree of oxidation of the ilmenites, estimated from the chemical analysis assuming ideally stoichiometric full cation site occupancies, is also confirmed by 57 Fe Mössbauer data. Since our crystal chemistry study gave no evidence of crypto-exsolution textures within the ilmenite with the observed compositions, fast cooling from magmatic temperatures and decomposition of ilmenite in supergene conditions is suggested.

Ilmenite

10.1180/0026461026630038

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Citations (8)