Wagner Silva AmaralState University of Campinas (UNICAMP) | UNICAMP · Departamento de Geologia e Recursos Naturais (DGRN)
Wagner Silva Amaral
PhD
Assistant Professor at Institute of Geosciences, University of Campinas - UNICAMP
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62
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Introduction
Geologist and PhD (2010) at the University of Campinas-UNICAMP. I am currently Assistant Professor in the Institute of Geosciences at UNICAMP. My research topics are related to geodynamics and crustal evolution of the Precambrian terrains. I also recently completed a post-doctorate (2019) at Cardiff University - UK, with topics related to isotopic geochemistry of iron manganese-sequences. Favourite hobbies include stargazing, astrophotography and mountain biking.
Additional affiliations
May 2013 - present
May 2011 - May 2013
Education
March 2007 - December 2010
Publications
Publications (62)
The Precambrian basement in the region of Cariré northeast Ceará Central Domain, NE Brazil, comprises essentially dioritic gneisses and granodiorites formed under high-grade metamorphism conditions. The granulites occur frequently as metric bodies or as boudins in mylonitic/cataclastic orthogneiss matrix, within shear zones related to Transbrasilia...
Our study helps to unravel the complexity of the Lomagundi–Jatuli event, the largest and longest positive carbon isotope excursion ever recorded on the Earth’s surface, by providing a unique view of Paleoproterozoic graphitic rocks from the Borborema province of Northeastern Brazil. Through detailed mineralogical, textural, chemical and isotopic an...
Our study helps to unravel the complexity of the Lomagundi-Jatuli event, the largest and longest positive carbon isotope excursion ever recorded on the Earth's surface, by providing a unique view of Paleoproterozoic graphitic rocks from the Borborema province of Northeastern Brazil. Through detailed mineralogical, textural, chemical and isotopic an...
Introdução e Objetivo. Este artigo examina as proposições dos Parâmetros Curriculares Nacionais (PCN) para o Ensino Fundamental e as deliberações preconizadas pela Base Nacional Comum Curricular (BNCC) para as instituições e redes de ensino brasileiras. Metodologia. Empregou-se a metodologia de análise de conteúdo e de revisão da literatura correla...
Archean to Paleoproterozoic crustal segments are widely recognized as basement inliers within the Neoproterozoic orogenic belts of the Pan-African/Brasiliano orogeny. For example, the Canindé do Ceará Complex, in the northern Borborema Province, NE Brazil, comprises a large domain of Paleoproterozoic high-grade metamorphic rocks with a protracted t...
O Projeto Geobike é uma iniciativa que objetiva aproveitar o potencial geológico de uma determinada região, utilizando a bicicleta como meio de transporte com o propósito de estimular e divulgar as Geociências tanto para os estudantes e profissionais da área acadêmica quanto para entusiastas das Ciências da Terra. A proposta inicial possui como áre...
The Borborema Province hosts several Mn-rich metasedimentary sequences, containing up to 40 wt% MnO(total). These sequences are composed of Mn oxide and Mn silicate lenses that alternate with spessartite quartzite layers. They are also spatially associated with graphite-bearing gneissic and granitic rocks. Here, we use the Lagoa do Riacho manganese...
Archean and Paleoproterozoic granitoids with different geochemical affinities are widely distributed in the basement of high-grade metamorphic rocks of the Bacajá Domain, which consists of Rhyacian granite-greenstone terrain with Archean-Siderian fragments, one of which is in the southeastern Amazonian Craton. Understanding the diversity of these r...
Accelerated precipitation of Mn-rich rocks in the early Paleoproterozoic ocean is considered to reflect the irreversible rise of oxygen in the atmosphere during the Great Oxidation Event (GOE), 2.501–2.220 billion years ago. But the precipitation conditions, pathways, mechanisms, and linkages to ocean redox, broadly remain unresolved. The Lagoa do...
A vast accumulation of manganese occurred in the Paleoproterozoic and it is closely related to the Paleoproterozoic Great Oxidation Event. Although the largest Mn deposits are located in the African continent, relevant deposits that potentially correlate with the African ones are found in South America, specifically in the Brazilian territory. The...
The Troia–Pedra Branca complex is the most extensive exposure of mafic–ultramafic rocks in the Borborema Province, northeastern Brazil. Chromitite occurrences in this unit are known for a long time, particularly because of its platinum group element (PGE) mineralization. The Troia–Pedra Branca complex consists of a succession of serpentinites (afte...
The amalgamation of continental masses during the formation of West Gondwana at the end of the Neo-proterozoic (ca. 0.6 Ga) resulted in the closure of oceans and associated generation of magmatic arcs. To better understand episodes of high magma production, compositional and isotopic evolution of arc magmatism in the western active margin of Gondwa...
The Paleoproterozoic Lagoa do Riacho manganese deposit in the Borborema Province is central to unravelling the genesis of Paleoproterozoic manganese deposits, Paleoproterozoic redox evolution and genetic relationship to the West African Craton. With manganese contents averaging 35 wt%, the Lagoa do Riacho manganese unit is lithologically subdivided...
Precambrian orogenic belts are key areas to understand how the continental crust formed and evolved with time, and to constrain when plate tectonics began on planet Earth. The Itabuna-Salvador-Curaçá Orogen, in the São Francisco Craton, is an orogenic belt over 800 km long that is interpreted as the result of collision of four blocks during the Pal...
The Pitangui greenstone belt (PGB) – located in the southern São Francisco Craton, (Brazil) – is a volcanosedimentary assemblage that is tectonically imbricated over the orthogneiss and granitoid rocks collectively termed the Divinópolis Complex. One diorite gneiss sample from the northern Divinópolis Complex yields an igneous zircon age of 2878 ±...
In the southern Brasília Orogen, slices of an intensively reworked Paleoproterozoic basement occur. These are partially covered by a Neoproterozoic sequence of high-metamorphic grade, corresponding to the Socorro–Guaxupé Nappe and intruded by several Neoproterozoic plutonic rocks. In this contribution, we present thermobarometric and geochronologic...
O cráton do São Francisco localizado na parte leste do território brasileiro é formado por núcleos arqueanos cobertos por rochas sedimentares proterozóicas a fanerozóicas e bordejado por faixas móveis brasilianas. No sudeste do Cráton o embasamento arqueano é dividido em complexos que são terrenos metamórficos de médio a alto grau, compostos por um...
We present in this paper petrologic data and discuss the pressure-temperature (P-T) metamorphic history of the neoproterozoic metasedimentary rocks of the Santa Filomena Complex, Riacho do Pontal Orogen, which is inserted in the southern portion of the Borborema Province (Northeast Brazil). Therefore, the data provide constraints on metamorphic evo...
The Ceará Central Domain, in the northern Borborema Province/NE Brazil, encompasses important geological records (geosites) which allow understanding a relevant period of the Earth's evolution, mainly associated to Neoproterozoic Brazilian/Pan-African Cycle and West Gondwana amalgamation, besides Neoarchean to Ordovician records. The presented geoh...
O Complexo Máfico-Ultramáfico de Boa Viagem (CMUBV) é constituído essencialmente de rochas metamáficas, com ocorrências subordinadas de rochas metaultramáficas, intrusivo em rochas granito-gnáissicas e migmatíticas do Complexo Cruzeta de idade neoarqueana. Apresenta forma grosseiramente elíptica, moldada por deformação dúctil nas bordas, que se alo...
The Neoarchean Rio das Velhas and Pitangui greenstone belts are situated in the southern São Francisco Craton, Minas Gerais, Brazil. These greenstone belts were formed between ca. 2.79–2.73 Ga, and consist mostly of mafic to ultramafic volcanics and clastic sediments, with minor chemical sediments and felsic volcanics that were metamorphosed under...
The Paulistana and Santa Filomena Complexes are situated in the southern part of the Borborema Province (northeastern Brazil), in the Riacho do Pontal Orogen, and represent meta-volcano-sedimentary sequences. We present compositional variations in the metasedimentary rocks and new U–Pb detrital zircon data. Major and trace elements indicate that th...
The Novo Oriente Group is a restricted well-preserved metasedimentary sequence, composed of two tectonic-stratigraphic sequences in the southwestern portion of the Ceará Central Domain, NE Brazil. The Bonsucesso Formation comprises mainly quartzite and metamafic rocks and the Caraúbas Formation is dominantly metapelitic, with chemical sedimentary c...
The Serra da Aldeia Suite is composed by circular or oval-shaped plutons, intrusive in meta-sedimentary and meta-volcanosedimentary rocks in the Riacho do Pontal Fold Belt, NE Brazil. The Serra das Melancias Pluton, belonging to Serra da Aldeia Suite, is located southeastern of Piaui state, near Paulistana city. Tese plutons represent a major magma...
Resumo As rochas pertencentes ao Greensotne belt de Pitangui, unidade correlata ao Grupo Nova Lima do Greenstone belt Rio das Velhas, foram metamorfizadas e alteradas hidrotermalmente, modificando sua composição e dando origem a uma série de mineralizações auríferas na região. O estudo das assembleias minerais, das relações texturais/estruturais e...
A sequência metavulcanossedimentar descrita na região de Pitangui/MG é correlata ao Grupo Nova Lima e recebe a denominação local de Greenstone Belt de Pitangui. Amostras de rochas metamáficas/metaultramáficas e metassedimentares coletadas ao longo dos rios Pará e São João, permitiram o estudo das assembleias minerais e relações texturais/estruturai...
High-pressure (HP) granulites of regional scale formed as a result of short-lived tectonic events that led to crustal thickening or subduction of the crust into the mantle (1). Most HP granulites are Phanerozoic and a few are Proterozoic. Archaean HP granulites are even rarer, probably owing to a higher thermal regime and thinner continental crust...
The Sossego iron oxide-copper-gold (IOCG) deposit is situated within the WNW-ESE-trending Canaã shear zone in the southern Copper belt, Carajás province, Brazil. The Sossego deposit consists of two major groups of orebodies (Sequeirinho-Pista-Baiano and Sossego-Curral). The Sequeirinho-Pista-Baiano orebodies are characterized by deep-emplaced magne...
No município de Novo Oriente, Ceará, na localidade conhecida como Morro dos Pereiras, rochas metaultramáficas ocorrem intercaladas a sequências metassedimentares pertencentes à Formação Caraúbas, do Grupo Novo Oriente. A partir de mapeamento em escala de detalhe (1:10.000) foram discriminadas as seguintes unidades: i) metaultramáfica, composta por...
The Late Neoproterozoic assembly of western Gondwana played an important role in the subduction of oceanic and continental lithosphere. Such event was also source of arc magmatism, reworking of cratonic margins and development of ultra-high pressure (UHP) suture zones. In the Borborema province, NE Brazil, we have described for the first time UHP r...
The use of techniques of digital image processing remote sensing allows applications of great importance for the geosciences. One of the possible fields of application of these resources is the geotechnical mapping. Filtering techniques for radar and optical images emphasize natural linear structures that can be interpreted as fractures, drainages,...
Major- and trace-element and U–Pb analyses of detrital zircons were performed on metavolcano sedimentary sequences and igneous rocks from the Ceará Central Domain (CCD) in the Borborema Province of northeastern Brazil. No significant geochemical differences were found between these rocks, which were possibly initially deposited as parts of a very l...
The Tamboril-Santa Quitéria Complex (TSQC) is one of the largest Neoproterozoic plutonic manifestations in the north Borborema Province (NE Brazil). It represents an anatectic/igneous association characterized by a number of magmatic pulses that occurred in the 650-610 Ma interval. In this paper, we present U-Pb (LA-MC-ICP-MS) zircon ages and Nd is...
The retrograded eclogites of the Forquilha area have been characterized based on detailed geological mapping and systematic petrography. These rocks occur as boudins enclosed into ortho- and
paragneisses and rarely in calc-silicate rocks along more than 16 km in a N-S trend, defining the Forquilha Eclogite Zone, in the NW portion of the Borborema P...
In the northwest region of the Ceará Central Domain, Borborema Province, an elongate area of mylonitic diorites and granodiorites is structurally controlled by NE–SW-trending strike-slip faults. Granitic material and layers and lenses of felsic and mafic granulites occur along the main shear zones. We present and discuss petrographic, geothermobaro...
A Província da Borborema constitui uma peça importante para o entendimento da aglutinação de Dahomeyide / Pharusian, África Central, Faixas móveis Araçuaí e Brasília, situadas entre os crátons São Luis, Oeste Africano,São Francisco-Congo e Cráton Amazonas (Fig. 1). Rochas formadas em condições de fácies eclogito são consideradas como marcadores de...
The Bacaba iron oxide-copper-gold deposit, situated within a WNW-ESE-striking shear zone in the Carajas Domain, Carajas Mineral Province, is hosted by the Serra Dourada Granite, the Bacaba Tonalite, and crosscutting gabbro intrusions, which were intensely affected by sodic (albite-scapolite), potassic, chloritic, and hydrolytic hydrothermal alterat...
In the northern region of the Borborema Province, a 30 km-long mafic/ultramafic belt of high pressure (HP) rocks called the Forquilha Eclogite Zone has been recently discovered in the Central Domain of Ceará State. The belt comprises three groups of rocks: (1) garnet amphibolites, (2) retrograded eclogites and (3) clinopyroxene–garnet amphibolites,...
The amalgamation of continental blocks during the development of the Western Gondwana led the closure of oceans in subduction setting and the formation of magmatic arcs. The boundaries of the collision of different crustal blocks are typically represented by a high-grade rock belts associated or not with ophiolitic sequence. In the northwestern par...
The Borborema Province, in the NE of Brazil, is a rather complex piece in the Brazil–Africa puzzle as it represents the junction of the Dahomeyide/Pharusian, Central African, Araçuai and Brasilia fold belts located between the West-African/São Luis, Congo/São Francisco and Amazonas craton. The correlation between the Dahomeyides from W-Africa (Ghan...
The airborne geophysical data gamma-spectrometric and magnetic from Itatira Project (1977) was carried out, in the central region of the State of the Ceará, Brazil. Their processing produced products useful to indirectly identify regional geologic features. The verification and applicability of this approach was tested in a pilot-area whose limits...
