A5035844263- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Mineralogy and Gemology Studies
- Geography and Environmental Studies
- earthquake and tectonic studies
- Clay minerals and soil interactions
- Paleontology and Stratigraphy of Fossils
- High-pressure geophysics and materials
- Fish biology, ecology, and behavior
- Iron oxide chemistry and applications
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies
- Crystal Structures and Properties
- Geology and Paleoclimatology Research
- Cultural Heritage Materials Analysis
- Radioactive element chemistry and processing
- Ichthyology and Marine Biology
- Glass properties and applications
- Geological formations and processes
- Paleontology and Evolutionary Biology
Universidade Federal de Ouro Preto
2002-2019
TU Bergakademie Freiberg
2016
Universidade Federal de Mato Grosso
2003
Universidade do Estado de Minas Gerais
1997
Escola Superior de Ciências da Saúde
1996
The Araçuaí belt corresponds to the external portion of western half Araçuaí-West Congo Neopro-terozoic orogen. TheAraçuaí fringes São Francisco craton east and is separated from crystalline core orogen by Abre Campo geophysical discontinuity. southern involves four major lithologic units: Archean Paleoproterozoic gneisses Mantiqueira Complex, Pedra Dourada Charnockite, Borrachudos Granitoid, metavolcanosedimentary rocks Dom Silvério Group. Group occurs in a NNE-SSW striking consists thick...
The Capelinha Formation (Macaúbas Group) consists of a lower quartzitic unit with metamafic intercalations and an upper metapelitic sequence. It occurs in complex tectono-metamorphic sector the Araçuaí orogen, where post-collisional collapse-related structures superimposed collisional structures. garnet-bearing assemblages started crystallization deformation stage that formed main regional foliation around 570 Ma. Garnet porphyroblasts display well-developed growth zonation Fe-Mg-Ca-Mn show,...
ABSTRACT: In the Itabira-Nova Era Emerald District, southeast Brazil, gemological emerald is extracted from underground mines found in schist-type deposits at contact zone of Archean Metavolcanosedimentary Sequence Guanhães Complex and Paleoproterozoic anorogenic granites Borrachudos Suite. Schist-type are commonly generated by reactions enhanced deformation heat during regional metamorphism. The age mineralization region has been a matter debate for decades: Ages ranging to Neoproterozoic...
The Lagoa Real Complex is constituted by 1.7 Ga granitoids that occur along the Paramirim valley. are formed São Timóteo Granite and a set of alkali-gneisses were crystallized during compressional sin-metamorphic deformation episode. carried out structural analysis has identified two patterns. episode represented shear zones, compositional layering, milonite foliation folds. extensional characterized nucleation normal zones. geometric patterns finite similar to ones in Ituaçu synclinal where...
The Sabara Group is a 3 - 3.5 km thick sequence composed of schists, meta-sandstones, meta-siltites, meta-conglomerates, meta-diamictites, meta-rhythmites and phyllites, whose protoliths are greywackes, sandstones, siltites, conglomerates, diamictites, rhythmites pelites. rocks the record significant change depositional setting sediment source comparing with rest Minas Supergroup. occurs suitable for sedimentological-stratigraphical analysis in Dom Bosco syncline, Moeda syncline Serra do...
The Acaiaca Complex (AC) is located in southeastern Minas Gerais state, and comprises felsic, mafic, ultramafic, aluminous granulites as well lower grade gneisses mylonites. complex distributed over an area of ca. 36 km by 6 km, surrounded amphibolite facies the Mantiqueira (MC). discrepancy metamorphic between both complexes led to present study aiming understand history AC means geothermobarometric calculations electron microprobe Th-U-Pb monazite dating. Estimates conditions based on...
This paper presents the results of a petrographic and geochronological investigation Furquim Quartzite (FQ) to establish its stratigraphic correlation quartzitic units Quadrilátero Ferrífero (QF) province. The comprises ca. 20km long 1-6km wide ridge overlying discordantly Archean Paleoproterozoic gneissic basement rocks Rio das Velhas Supergroup between city Mariana town Furquim, southeast QF. Despite discordant contacts, previous field-based studies considered as part Maquiné Group – top...
A região de Lamim, sudeste do Quadrilátero Ferrífero (QF), é constituída gnaisses e rochas metamáficas metaultramáficas, estas Grupo Nova Lima, base greenstone belt Rio das Velhas. As principais metaultramáficas são pedra-sabão, amplamente explotada no QF, serpentinito. distingue-se por com olivina preservada, interpretadas como o protólito magmático metaultramáficas. São olivina-anfibólio fels textura semelhante a cumulus, inclusão vários grãos em anfibólio porte maior. O teor relativamente...
ABSTRACT: This paper concerns the study of petrography, mineral chemistry and geochronology skarns generated at contact marbles Paraíba do Sul Complex with felsic metamafic dykes in southern Espírito Santo State. The were metamorphosed under P-T granulite facies conditions during syn-collisional stage Neoproterozoic Araçuaí orogen. Metamafic bodies are composed amphibolite hornblende granofels, while consist alkali-feldspar granite, monzogranite or syenogranite. From marble towards dyke,...
Mafic amphibolitic dikes cutting tonalitic rocks with little evidence of metamorphism are one the singularities in crusta, evolution Quadrilatero Ferrifero, Minas Gerais. Petrographic, geochemical and geochronogical studies show that Bonfim Metamorphic Complex these rock types constitute two distinct magmatic series, tholeiitic other calcalkaline. They were partially metamorphosed under conditions higher greenschist to lower amphibolite facies. In calcalkaline tonalites metamorphic...
QUADRILÁTERO FERRÍFERO, BRAZIL Mafic amphibolitic dikes cutting tonalitic rocks with little evidence of metamorphism are one the singularities in crusta, evolution Quadrilátero Ferrífero, Minas Gerais.Petrographic, geochemical and geochronogical studies show that Bonfim Metamorphic Complex these rock types constitute two distinct magmatic series, tholeiitic other calcalkaline.They were partially metamorphosed under conditions higher greenschist to lower amphibolite facies.In calcalkaline...
In the Southeastern Quadrilátero Ferrífero, a package of metapelitic rocks previously attributed to Archean Rio das Velhas Supergroup crops out in Piranga locality. This study presents mineral chemistry and U-Pb-Hf zircon geochronology on foliated staurolite-garnet mica schists. Garnet staurolite index minerals are syn- post-kinematic towards main schistosity. porphyroblasts display well-developed compositional zoning Mg-Fe-Mn-Ca, with increase almandine pyrope decrease spessartine rim,...
Since 1975, alexandrite [Be(Al2-xCrx)2O4], the chromium-bearing crysoberyl variety, has been exploitedfrom alluvial and paleo-alluvial deposits in Malacacheta region. The consist ofresedimented gravel along present drainage streams. are richer alexandrite,and show well-developed soil horizons covering alexandrite-bearing layer. Alexandrite grainsshow angular shapes with very sharp edges, suggesting transport for short distances. country rocks arequartz-mica schist peraluminous mica (Salinas...
Orthopyroxene-bearing felsic and mafic rocks are important components of the transition zone between Archean Sao Francisco Craton Late Proterozoic Costeiro Mobile Belt in southeastern Brazil. The Pedra Dourada Charnockite is a rock charnockite-enderbite granite-tonalite series which intruded into pyribolites gabbroic composition. Besides clearly intrusive contacts rocks, transitional, migmatite-type also occur. charnockites have relict magmatic textures contrast with metamorphic pyribolites....
Orthopyroxene-bearing felsic and mafic rocks are important components of the transition zone between Archean São Francisco Craton Late Proterozoic Costeiro Mobile Belt in southeastern Brazil.The Pedra Dourada Charnockite is a rock charnockite-enderbite granite-tonalite series which intruded into pyribolites gabbroic composition.Besides clearly intrusive contacts rocks, transitional, migmatite-type also occur.The charnockites have relict magmatic textures contrast with metamorphic...
ANitCfrom Santa Maria do Itabira in Minas Gerais is cut by amazonite-bearing pegmatites., being.marginally.transformedinto a green granite due to à"rur"-"itiìut,*.}ti.pápér ¿""rr;irh;h; pññesánd the miniralògicäf añd chemical va-ria.tioñsinvolved transformation of normal into granite.?h";;;;-*id'" peg"¡natite composed decimeter-large anrazonite clystals intense color, cleavelandite, biotite, qtrartz and small arìrounts ol blacli tourmaline, galena, fluorite xnd...
Agalmatolite is a peraluminous rock type of industrial use composed essentially pyrophyllite. Northwest the Quadrilátero Ferrífero mineral province in Minas Gerais, agalmatolite occurrences and mines are distributed over an area about 350 km2. There several types commercially named which made up minerals other than pyrophyllite, such as muscovite, quartz, kyanite andalusite showing variable degrees replacement by pyrophyllite diaspore. Analyses SEM/EDS, optical microscopy X ray diffraction...
Deposits of corundum in the region Manhuaçu–Caratinga, eastern Minas Gerais, are described termsof geology, economic potential, mineralogy and chemistry. The alluvial colluvial deposits Indaiá,Sapucaia, Caputira Palmeira found within high grade metamorphic terrains, belonging to Juizde Fora Mantiqueira complexes, cut by pegmatites as well mafic rocks. Gemmological characterizationin terms mineral color inclusions indicate a good potential gemstone studiedcorundum. identification study...