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portuguesO Granito Pedra Branca esta localizado na regiao oeste da cidade do Rio de Janeiro e corresponde a um dos corpos intrusivos mais importantes associados ao estagio tardi a pos- tectonico no segmento central do Orogeno Ribeira. Em uma de suas faciologias, excepcionais estruturas de acamamento magmatico sao formadas pela intercalacao de bandas de rochas de composicao monzogranitica e leucogranitica. A fim de compreender os processos fisico-quimicos e a forma de ocorrencia dessas estruturas, foram realizados estudos de campo, petrograficos e litogeoquimicos. A analise dos resultados mostrou que o acamamento magmatico e co-genetico com as demais litologias encontradas no Granito Pedra Branca e sua forma de ocorrencia e restrita as zonas de borda da intrusao. A sua diferenciacao magmatica foi atribuida a ascensao do magma proximo a borda dos condutos, favorecendo a cristalizacao “in situ” e, posteriormente, com cerca de 72% de material cristalizado, o crystal mush foi submetido ao processo de filter pressing favorecendo a migracao do liquido residual para regioes de baixos gradientes de pressao, gerando uma estrutura de acamamento magmatico EnglishPedra Branca Granite occurs on the western region of Rio de Janeiro city and corresponds to one of the most important intrusive bodies associated with the late- to post-tectonic stage of the Ribeira Orogen. Exceptional magmatic foliation structures, given by the interlayering ot monzogranitic and leucogranitic bands were mapped. To understand the physical and chemical processes and the form of occurrence of these structures, field, petrographic and lithogeochemical studies were carried out. Results show that the magmatic layering is co-genetic with other facies found in Pedra Branca Granite and that its form of occurrence is restricted to the intrusion borders. Its genesis is attributed to magmatic differentiation, as follows: with the ascension of the magma, crystallization “in situ” was favored near the edge of the conduits; with about 72% of crystallized material, the “crystal mush” was compressed by “filter pressing” process, favoring migration of intercumulatic a low pressure gradient path, generating a magmatic layering structure

A ORIGEM DO ACAMAMENTO MAGMÁTICO NO GRANITO PEDRA BRANCA, MACIÇO DA PEDRA BRANCA, RIO DE JANEIRO, BRASIL