Fazies und Magmatismus der Minas-Serie in der südlichen Serra do Espinhaço, Minas Gerais, Brasilien

Renger, Friedrich Ewald

doi:10.1007/bf02042292

Cited by 16 publications

(10 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Predominam amplamente clorita filitos e menores intercalações de hematita filito, sericita filito e hematita-sericita filito. A interpretação corrente é que essa sucessão representa os produtos do metamorfismo e da deformação de protólitos de origem vulcânica básica (Renger, 1970;Hoppe, 1978). Os filitos hematíticos representam o produto de metamorfismo sobre perfis de alteração superficial sobre rochas ígneas de composição básica, em alguns locais podendo representar verdadeiras paleolateritas (Knauer & Schrank, 1993).…”

Section: Sequência Deposicional São João Da Chapadaunclassified

As Bacias Proterozóicas Do Espinhaço E São Francisco Em Minas Gerais: Uma Abordagem Do Ponto De Vista Da Estratigrafia De Sequências

Silva¹

1998

Geonomos

View full text Add to dashboard Cite

This work deals with Sequence Stratigraphy concepts applied to the Proterozoic record of the SãoFrancisco Craton in Minas Gerais, southeast Brazil. The cratonic cover is characterized by eight sequenceboundaries (unconformity and/or correlative conformity), which subdivide the Proterozoic stratigraphyinto seven depositional sequences. These sequences initially filled an intracratonic rift basin (the EspinhaçoBasin), which evolved into a passive continental margin (the São Francisco Basin). The Espinhaço Basinwas filled by six stacked depositional sequences. Their sequence boundary unconformities are indicative oftaphrogenic periods, when tectonic displacements were mainly accomodated along a master listric fault,but also along synthetic and antithetic subsidiary normal faults. The unconformities are covered by coarsealluvial conglomerates, deposited by the combined effects of source area uplift and depocenter subsidence.The depositional sequences of the Espinhaço Basin show impressive cyclical depositional patterns. Theyusually show the unconformities and the basal conglomerates covered by shallow-marine transgressivesediments. The São Francisco Basin, a passive continental margin, was developed at approximately 0.9 Ga.Coevally, a continental glatiation occurred over the craton, which produced a relative fall in the sea level,erosion and hence unconformity development. During that time, the basin was characterized by the depositionof tillites on the proximal reachs and turbidites on the distal portions. A transgressive phase followed theglaciation and was marked by the deposition of fine-grained sediments (lutites) and carbonatic rocksoverlaying the cratonic areas. Around 0.6 Ga, during the Brasiliano Orogeny, the Espinhaço and São FranciscoBasins were inverted.

show abstract

Section: Sequência Deposicional São João Da Chapadaunclassified

As Bacias Proterozóicas Do Espinhaço E São Francisco Em Minas Gerais: Uma Abordagem Do Ponto De Vista Da Estratigrafia De Sequências

Silva¹

1998

Geonomos

View full text Add to dashboard Cite

show abstract

“…Suas feições, do ponto de vista petrográfico, químico e de enquadramento na geologia, têm gerado interpretações diversas sobre a evolução dessas seqüências. As hipóteses nesse sentido concentram-se em torno de um modelo de geração e emplacement de assoalho oceânico (Renger 1970, Hoppe 1984 ou na paralelização com estruturas do tipo greenstone belts, geradas durante um processo de adelgaçamento crustal (Uhlein & Dardenne 1984, Herrgesell 1984. Na porção central da Cordilheira (Região de Gouveia), ocorrem seqüências de rochas sedimentares com vulcânicas subordinadas, associadas a espessos pacotes de milonitos, numa sucessão logo semelhante às ocorrências da borda leste, constituindo o Supergrupo Rio Paraúna de Fogaça et al,(l 984).…”

Section: Quadro Geológico Regional a Geologia Dounclassified

Compartimentação Estratigráfica Do Supergrupo Espinhaço Em Minas Gerais - Os Grupos Diamantina E Conselheiro Mata

DOSSIN¹,

DOSSIN²,

Chaves³

1990

RBG

View full text Add to dashboard Cite

THE STRATIGRAPHICAL ARRANGEMENT OF THE ESPINHAÇO SUPERGROUP IN MINAS GERAIS-THE DIAMANTINA AND CONSELHEIRO MATA GROUPS. The quartzitic sequences which build the Espinhaço Range in the center-north of Minas Gerais and in Bahia, constitute the Espinhaço Supergroup. In the Southein Espinhaço Region, the unit is composed of eight formations which can be assembled into two distinct groups based on the depositional evolution of the sedimentary basin. The Diamantina Group corresponding to three Espinhaço Supergroup basal formations, occurs in the central and east portion of the range and is made up of continental meta-sediments corresponding to a period of great crustal unstability. The more frequent rocks are quartettes, meta-conglomerates locally diamond-bearing (Sopa-Brumadinho Formation), phyllite and bimodal metavolcanics. The Conselheiro Mata Group contains the upper formations, is characteristically marine, transgressive on that took place tendencies in under a stable tectonic phase. The unit is a sucession of quartzits ad phyllites, without synsedimentarv volcanism. The deposition of the Supergroup occured during Mid Proterozoic, in a rift-type intracratonic basin, whose main axis was located west of Diamantina. Deformation of the unit is related to the Brasiliano Cycle and was triggered by a continental collision east ward from the cordillera, responsible for a contractional orogen which affected all the region toward the São Francisco Craton and under simple progressive shearing regime.

show abstract

“…Inzwischen lassen sich die Ultrabasite fiber weite Areale verfolgen (BELEZKIJ, 1959;RENGER, 1970;PFLUG et al, 1969).…”

Section: Magmatische Gesteineunclassified

Fazieswechsel und Metamorphose in der westlichen Serra Negra (Espinhaço-Zone, Minas Gerais, Brasilien)

Gorlt

1972

Geol Rundsch

View full text Add to dashboard Cite

ZusammenfassungEs wird eine ~bersidatskarte fiir die Serra Negra (Ostrand der Espinha~o-Zone) im MaBstab 1 : 250 000 vorgelegt.Lithologische Faziesiiberg~inge und das Vorkommen ultrabasischer bis basisdaer Gesteine belegcn einen mio-/eugeosynklinalen (3bergangsbereich der Minas-Geosynklinale. In der jfingeren, die Minas-Serie diskordant fiberlagernde S~o-Francisco-Serie (Macaflbas-Fazies) wurden erstmals magmatisdae Gesteine nachgewiesen.Die metamorphen Mineralneubildungen in der Minas-Serie weisen auf eine nada Osten zunehmende Regionahnetamorphose hin. Der griil3te Tell des Arbeitsgebietes liegt im (3bergangsbereich Grfinsdfiefer-/Amphibolit-Fazies. AbstractA regional study of the Serra Negra (eastern region of the Serra do Espinha~o) was carried out at the scale 1 : 250 000.Lithologic facies changes and occurences of ultrabasic and basic rocks allow to delimit a mio/eugeosynclinal transition within the Precambrian Minas-Geosyncline. Within a post-Minas sequence (Macafbas-Facies of the S~o Francisco Series) magmatic rocks have been encountered for the first time.Regional metamorphism within the Minas-Series is increasing to the east. The maior part of the area belongs to a transitional zone between the greenshist-and amphiboliteFacies.

show abstract

Fazies und Magmatismus der Minas-Serie in der südlichen Serra do Espinhaço, Minas Gerais, Brasilien

Cited by 16 publications

References 12 publications

As Bacias Proterozóicas Do Espinhaço E São Francisco Em Minas Gerais: Uma Abordagem Do Ponto De Vista Da Estratigrafia De Sequências

As Bacias Proterozóicas Do Espinhaço E São Francisco Em Minas Gerais: Uma Abordagem Do Ponto De Vista Da Estratigrafia De Sequências

Compartimentação Estratigráfica Do Supergrupo Espinhaço Em Minas Gerais - Os Grupos Diamantina E Conselheiro Mata

Fazieswechsel und Metamorphose in der westlichen Serra Negra (Espinhaço-Zone, Minas Gerais, Brasilien)

Contact Info

Product

Resources

About