Metabasalts
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Geoquímica de rochas metabasálticas da mina da Palma, Bloco São Gabriel, escudo sul-rio-grandense: um possível platô oceânico
The Mina da Palma oceanic plateau is described for the first time in the São Gabriel Block, southern Brazilian Shield. It is composed mostly of metabasalts, marbles and metachert. Two deformational events are recognized in the Palma region, thrust faulting followed by dextral subvertical shearing. The rocks were metamorphosed in the greenschist facies, as s
Publicado em: 2010
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2. Geoquímica e isótopos de Nd de rochas metavulcânicas da antiforme Capané, complexo metamórfico Porongos, RS
The Capané Antiform, located in the northern part of the Neoproterozoic Porongos Metamorphic Complex (RS), is composed of a supracrustal sequence metamorphosed under greenschist (eastern flank) to amphibolite (western flank) facies. Four groups of rocks were recognized. Groups 1 and 2 are constituted of felsic and mafic rocks from the central and western pa
Publicado em: 2010
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3. Petrogenese do granodiorito Fazenda Gavião : registro de uma colisão arco-continente no greenstone belt do Rio Itapicuru, Craton do São Francisco, Bahia / Petrogenesis of the Fazenda Gavião granodiorite : a record of an arc-continent collision in the Rio Itapicuru greenstone belt, São Francisco Craton, Bahia
The Rio Itapicuru greenstone belt is a gold-bearing Palaeoproterozoic volcanic-sedimentary sequence intruded by several granitic plutons in the time interval 2160-2070 Ma. The Fazenda Gavião granodiorite (FGG) is one of a set of plutons emplaced along the western boundary of the greenstone belt with the Archaean basement complex. The FGG is largely composed
Publicado em: 2008
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4. A unidade Maria Preta : geologia, geoquimica e petrogenese de rochas vulcanicas e sub-vulcanicas intermediarais a felsicas no "Greenstone Belt" do rio Itapicuru, Bahia / The Maria Preta unit : geology, geochemistry and petrogenesis of volcanic and sub-volcanic intermediate to felsic rocks in the Rio Itapicuru greenstone belt, Bahia
New geochemical data on andesites and dacites of the Maria Preta Unit, Rio Itapicuru Greenstone Belt, revealed two distinct geochemical groups: one of adakitic affinity and another of typical calc-alkaline. The adakitic suite, localized west in the unit, is characterized by high values of Sr/Y and Ti/YN >1. It shows enrichment in LFSE (Low Field Strength Ele
Publicado em: 2008
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5. Petrografia e geoquímica das rochas metavulcânicas máficas e ultramáficas do complexo metamórfico Brusque, região Serra da Miséria, Itapema, SC
O Complexo Metamórfico Brusque (CMB) é uma das principais unidades do Cinturão Tijucas em Santa Catarina. Na região de Itapema este complexo é composto por uma associação de metassedimentos com ocorrência subordinada de rochas metavulcânicas máficas e ultramáficas. Estas rochas estão expostas na forma de quatro corpos principais com espessuras m�
Publicado em: 2007
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6. Rochas metamorficas maficas e ultramaficas do Greenstone Belt Barbacena na região de Itutinga, MG
In the area around ltutinga-Nazareno, Minas Gerais State, at the southeastem limit of São Francisco Craton, there are outcrops of thick successions of volcanic mafic and ultramafic rocks that are the subbject of the present study. This volcano-sedimentary succession is mainly constituted by metabasalts, metakomatiites and minor metassedimentary rocks, and i
Publicado em: 2000
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7. O magmatismo associado ao deposito mineral cupro-aurifero do Igarape, Bahia, Carajas, PA, Brasil
The polymetallic Igarapé Bahia mineral deposit (Cu-Au-Ag-Mo) is hosted by the low-grade metavolcanic and metasedimentary roeles of the Igarapé Bahia Group in the Carajás Mineral Province, northern Brazil. The Igarapé Bahia Group consists mainly of basic volcanic and pyroclastic rocks, psamo-pelitic sedimentary rocks and iron formation, which follow a gen
Publicado em: 1993