Search results for: João Mata

Items from 1 to 20 out of 23 results

article

Nature, timing and magnitude of buried Late Cretaceous magmatism on the central West Iberian Margin

Ricardo Pereira, João Mata, Ricardo S. Ramalho, Filipe M. Rosas, more

The magma‐poor West Iberian Margin (WIM), as part of the Peri‐Atlantic alkaline province, records multiple evidence for intra‐plate post‐rift magmatism. Based on high‐resolution multichannel seismic data, this work discusses the presence of large volcanic and intrusive features in the Estremadura Spur, providing evidence for important magmatic activity during the drifting of the continental margin...

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Interplay of tectonics and magmatism during post‐rift inversion on the central West Iberian Margin (Estremadura Spur)

Ricardo Pereira, Filipe Rosas, João Mata, Patrícia Represas, more

Basin Research > 33 > 2 > 1497 - 1519

The combined effects of post‐rift magma emplacement and tectonic inversion on the hyper‐extended West Iberian Margin are unravelled in detail using multichannel 2D/3D seismic data. The Estremadura Spur, acting as an uplifted crustal block bounded by two first‐order transfer zones, shows evidence of four post‐rift tectonic events each with a distinctive seismic‐stratigraphic response that can be used...

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A geological record of multiple Pleistocene tsunami inundations in an oceanic island: The case of Maio, Cape Verde

José Madeira, Ricardo S. Ramalho, Dirk L. Hoffmann, João Mata, more

Sedimentology > 67 > 3 > 1529 - 1552

In the Central Atlantic archipelagos – the Canaries, Cape Verde, Madeira and the Azores – tsunami hazard is often regarded as low, when compared with other extreme wave events such as hurricanes and storms. The geological record of many of these islands, however, suggests that tsunami hazard may be underestimated, notwithstanding being lower than in areas adjacent to subduction zones, such as the...

article

Evidence for an early-MORB to fore-arc evolution within the Zagros suture zone: Constraints from zircon U-Pb geochronology and geochemistry of the Neyriz ophiolite (South Iran)

Iman Monsef, Reza Monsef, João Mata, Zhiyong Zhang, more

Gondwana Research > 2018 > 62 > C > 287-305

Late Cretaceous Neyriz ophiolite, as a part of the Outer Zagros Ophiolitic Belt, represents a remnant of the southern Neo-Tethyan oceanic lithosphere exposed along the Zagros suture zone in the south of Iran. Neyriz ophiolite is composed of dismembered lithological units including variably depleted mantle peridotites as well as intrusive and extrusive rocks preserving a geochemical evolution from...

article

The genetic link between the Azores Archipelago and the Southern Azores Seamount Chain (SASC): The elemental, isotopic and chronological evidences

Luisa Pinto Ribeiro, Sofia Martins, Anthony Hildenbrand, Pedro Madureira, more

Lithos > 2017 > 294-295 > C > 133-146

New geochemical, isotopic (Sr-Nd-Hf-Pb) and K-Ar data, are presented here on samples from the Southern Azores Seamount Chain (SASC) located south of the Azores Plateau. The SASC also includes the Great Meteor, Small Meteor and Closs seamounts, morphologically connected by a saddle at −4100m deep. We conclude that the SASC are characterized by a narrow isotopic variability that falls within the Azores...

article

Restitic or not? Insights from trace element content and crystal — Structure of spinels in African mantle xenoliths

Davide Lenaz, Maria Elena Musco, Maurizio Petrelli, Rita Caldeira, more

Lithos > 2017 > 278-281 > C > 464-476

The lithospheric architecture of Africa consists of several Archean cratons and smaller cratonic fragments, stitched together and flanked by polycyclic fold belts. Here we investigate the structure and chemistry of spinels from lithospheric mantle xenoliths from distinct tectonic settings, i.e. from the Saharan metacraton in Libya (Waw-En-Namus) which could show archaic chemical features, Cameroon...

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Refining the Stratigraphy of the Taghdout Group by Using the U‐Pb Geochronology of the Taghdout Sill (Zenaga inlier, Anti‐Atlas, Morocco)

Abdelhak AIT LAHNA, Colombo Celso Gaeta TASSINARI, Nasrrddine YOUBI, Hassan ADMOU, more

Acta Geologica Sinica ‐ English Edition > 90 > s1 > 1 - 1

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Reply to Comment on “The Jurassic–Cretaceous basaltic magmatism of the Oued El-Abid syncline (High Atlas, Morocco): Physical volcanology, geochemistry and geodynamic implications” by André Michard et al. (2013) [J. Afr. Earth Sci. 88 (December) (2013) 101–105]

Mohamed Khalil Bensalah, Nasrrddine Youbi, João Mata, José Madeira, more

Journal of African Earth Sciences > 2016 > 118 > C > 320-323

We welcome the comment by Michard et al. (2013) as it gives us the opportunity to better discuss the Jurassic–Cretaceous magmatism of the High Atlas (Morocco). In their comment, Michard et al. (2013) focus on three main points which are: (i) the age of the basalts from Naour, (ii) the structural history of the Central High Atlas and (iii) the geodynamic significance of the related Jurassic–Cretaceous...

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Interaction between felsic and mafic magmas in the Salmas intrusive complex, Northwestern Iran: Constraints from petrography and geochemistry

Mitra Ghaffari, Nematollah Rashidnejad-Omran, Rahim Dabiri, José Francisco Santos, more

Journal of Asian Earth Sciences > 2015 > 111 > C > 440-458

The Salmas plutonic complex, in the northernmost part of Sanandaj-Sirjan Zone of Iran, provides evidence for magma interaction processes. The complex contains mafic-intermediate, hybrid and felsic rocks which intruded into the Paleozoic metamorphic complex. They show typical relationships described in many mafic–felsic mingling and mixing zones worldwide, such as mafic microgranular enclaves (in felsic...

article

Helium isotope systematics in the vicinity of the Azores triple junction: Constraints on the Azores geodynamics

Pedro Madureira, Manuel Moreira, João Mata, João Carlos Nunes, more

Chemical Geology > 2014 > 372 > Complete > 62-71

We present new He isotopic data from subaerial and submarine samples collected along the Terceira Rift (Azores Plateau) in order to constrain the sources involved in the Azores magmatism in the unique geodynamic context of the Azores triple junction. Lower than MORB ⁴ He/ ³ He isotopic ratios were determined on olivines from the Terceira Island and the adjacent Serreta submarine ridge...

article

Enriched mantle source for the Central Atlantic magmatic province: New supporting evidence from southwestern Europe

Sara Callegaro, Cedric Rapaille, Andrea Marzoli, Hervé Bertrand, more

LITHOS > 2014 > 188 > Complete > 15-32

Remnants of the Central Atlantic magmatic province (CAMP), emplaced ca. 201Ma during the rifting phases leading to Pangaea breakup, are still preserved in southwestern Europe (SWE) in the form of sills, dykes and lava flows. Low–Ti (TiO ₂ 0.48–1.46wt.%) tholeiitic basalts and basaltic andesites crop out as sills only in the Pyrenean area, as dykes (especially the Messejana–Plasencia dyke)...

article

The Jurassic–Cretaceous basaltic magmatism of the Oued El-Abid syncline (High Atlas, Morocco): Physical volcanology, geochemistry and geodynamic implications

Mohamed Khalil Bensalah, Nasrrddine Youbi, João Mata, José Madeira, more

Journal of African Earth Sciences > 2013 > 81 > Complete > 60-81

Basaltic lava flows, dykes and sills, interbedded within red clastic continental sedimentary sequences (the so called “Couches Rouges”) are widespread in the Oued El-Abid syncline. They represent the best candidates to study the Jurassic–Cretaceous magmatism in the Moroccan High Atlas. The volcanic successions were formed during two pulses of volcanic activity, represented by the Middle to Upper Jurassic...

article

Geochemical evidence for melting of carbonated peridotite on Santa Maria Island, Azores

Christoph Beier, João Mata, Ferdinand Stöckhert, Nadine Mattielli, more

Contributions to Mineralogy and Petrology > 2013 > 165 > 5 > 823-841

The islands of the Azores archipelago emerge from an oceanic plateau built on lithosphere increasing in age with distance from the Mid-Atlantic Ridge from 10 to 45 Ma. Here, we present the first comprehensive major and trace element and Sr–Nd–Pb isotope data from Santa Maria, the easternmost island of the archipelago, along with published data from the other Azores islands situated much closer to...

article

Geochemical temporal evolution of Brava Island magmatism: Constraints on the variability of Cape Verde mantle sources and on carbonatite–silicate magma link

Cyntia Mourão, João Mata, Régis Doucelance, José Madeira, more

Chemical Geology > 2012 > 334 > Complete > 44-61

Elemental and isotopic (Sr, Nd and Pb) analyses of silicate and carbonatite rocks from Brava, the southernmost island of the Cape Verde archipelago, are reported here to assess the nature, origin and location of the main contributors to magma composition and to evaluate the chemical evolution of magma through time. In contrast to other islands of the archipelago where a continuous range is usually...

article

Constraints on the structure of Maio Island (Cape Verde) by a three‐dimensional gravity model: imaging partially exhumed magma chambers

Patrícia Represas, João Catalão, Fuensanta G. Montesinos, José Madeira, more

Geophysical Journal International > 190 > 2 > 931 - 940

We propose a 3‐D gravity model for the volcanic structure of the island of Maio (Cape Verde archipelago) with the objective of solving some open questions concerning the geometry and depth of the intrusive Central Igneous Complex. A gravity survey was made covering almost the entire surface of the island. The gravity data was inverted through a non‐linear 3‐D approach which provided a model constructed...

article

Primary and secondary processes constraining the noble gas isotopic signatures of carbonatites and silicate rocks from Brava Island: evidence for a lower mantle origin of the Cape Verde plume

Cyntia Mourão, Manuel Moreira, João Mata, Aude Raquin, more

Contributions to Mineralogy and Petrology > 2012 > 163 > 6 > 995-1009

We present and discuss noble gas compositions of minerals from silicate rocks (olivines) and carbonatites (apatites and calcites) from Brava Island. The presence of an almost ubiquitous atmosphere-derived fingerprint is explained as reflecting contamination by seawater. Because of the high U and Th content in apatites, which are responsible for ⁴He production by α-decay, the high measured ⁴He/³He...

article

Mantle source heterogeneity, magma generation and magmatic evolution at Terceira Island (Azores archipelago): Constraints from elemental and isotopic (Sr, Nd, Hf, and Pb) data

Pedro Madureira, João Mata, Nadine Mattielli, Gabriela Queiroz, more

LITHOS > 2011 > 126 > 3-4 > 402-418

This work addresses the present-day (<100ka) mantle heterogeneity in the Azores region through the study of two active volcanic systems from Terceira Island. Our study shows that mantle heterogeneities are detectable even when “coeval” volcanic systems (Santa Bárbara and Fissural) erupted less than 10km away. These volcanic systems, respectively, reflect the influence of the Terceira and D. João...

article

Volcano-stratigraphic and structural evolution of Brava Island (Cape Verde) based on 40Ar/39Ar, U–Th and field constraints

José Madeira, João Mata, Cyntia Mourão, António Brum da Silveira, more

Journal of Volcanology and Geothermal Research > 2010 > 196 > 3-4 > 219-235

Three volcano-stratigraphic units were identified at Brava Island in the Cape Verde Archipelago on the basis of field relationships, geologic mapping and ⁴⁰ Ar/ ³⁹ Ar and U–Th ages. The Lower Unit comprises a 2-to-3Ma-old submarine volcanic sequence that represents the seamount stage. It is composed of nephelinitic/ankaramitic hyaloclastites and pillow lavas, which are cut by abundant...

article

Noble gas and carbon isotopic signatures of Cape Verde oceanic carbonatites: Implications for carbon provenance

João Mata, Manuel Moreira, Régis Doucelance, Magali Ader, more

Earth and Planetary Science Letters > 2010 > 291 > 1-4 > 70-83

We discuss noble gas (He, Ne, Ar, Kr, and Xe) and C isotope signatures of carbonatites from the Cape Verde Archipelago. These are the first noble gas compositions ever reported for oceanic carbonatites. The noble gas analyses were performed by crushing the calcite and apatite separates. Some of the analyzed calcites present low ⁴ He/ ³ He ratios (down to 46,700; R/Ra up to 15.5) that...

article

Quaternary extrusive calciocarbonatite volcanism on Brava Island (Cape Verde): A nephelinite-carbonatite immiscibility product

Cyntia Mourão, João Mata, Régis Doucelance, José Madeira, more

Journal of African Earth Sciences > 2010 > 56 > 2-3 > 59-74

The Cape Verde volcanic archipelago, located in the oceanic portion of the African plate some 500km west of the Senegal coast, is renowned for the occurrence of carbonatites on at least 5 of its 10 islands. In this study we report the occurrence of about twenty new small outcrops of extrusive carbonatites on Brava Island (64km ² ), the south-westernmost island of the archipelago. These new...

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Search results for: João Mata

Nature, timing and magnitude of buried Late Cretaceous magmatism on the central West Iberian Margin

Interplay of tectonics and magmatism during post‐rift inversion on the central West Iberian Margin (Estremadura Spur)

A geological record of multiple Pleistocene tsunami inundations in an oceanic island: The case of Maio, Cape Verde

Evidence for an early-MORB to fore-arc evolution within the Zagros suture zone: Constraints from zircon U-Pb geochronology and geochemistry of the Neyriz ophiolite (South Iran)

The genetic link between the Azores Archipelago and the Southern Azores Seamount Chain (SASC): The elemental, isotopic and chronological evidences

Restitic or not? Insights from trace element content and crystal — Structure of spinels in African mantle xenoliths

Refining the Stratigraphy of the Taghdout Group by Using the U‐Pb Geochronology of the Taghdout Sill (Zenaga inlier, Anti‐Atlas, Morocco)

Reply to Comment on “The Jurassic–Cretaceous basaltic magmatism of the Oued El-Abid syncline (High Atlas, Morocco): Physical volcanology, geochemistry and geodynamic implications” by André Michard et al. (2013) [J. Afr. Earth Sci. 88 (December) (2013) 101–105]

Interaction between felsic and mafic magmas in the Salmas intrusive complex, Northwestern Iran: Constraints from petrography and geochemistry

Helium isotope systematics in the vicinity of the Azores triple junction: Constraints on the Azores geodynamics

Enriched mantle source for the Central Atlantic magmatic province: New supporting evidence from southwestern Europe

The Jurassic–Cretaceous basaltic magmatism of the Oued El-Abid syncline (High Atlas, Morocco): Physical volcanology, geochemistry and geodynamic implications

Geochemical evidence for melting of carbonated peridotite on Santa Maria Island, Azores

Geochemical temporal evolution of Brava Island magmatism: Constraints on the variability of Cape Verde mantle sources and on carbonatite–silicate magma link

Constraints on the structure of Maio Island (Cape Verde) by a three‐dimensional gravity model: imaging partially exhumed magma chambers

Primary and secondary processes constraining the noble gas isotopic signatures of carbonatites and silicate rocks from Brava Island: evidence for a lower mantle origin of the Cape Verde plume

Mantle source heterogeneity, magma generation and magmatic evolution at Terceira Island (Azores archipelago): Constraints from elemental and isotopic (Sr, Nd, Hf, and Pb) data

Volcano-stratigraphic and structural evolution of Brava Island (Cape Verde) based on 40Ar/39Ar, U–Th and field constraints

Noble gas and carbon isotopic signatures of Cape Verde oceanic carbonatites: Implications for carbon provenance

Quaternary extrusive calciocarbonatite volcanism on Brava Island (Cape Verde): A nephelinite-carbonatite immiscibility product

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