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Geology and geochemistry of paleoproterozoic magnesite deposits (-1.8Ga), State...

Parente, Clóvis Vaz; Ronchi, Luis Henrique; Sial, Alcides Nóbrega; Guillou, Jean Jacques; Arthaud, Michel Henri; Fuzikawa, Kazuo

Five important magnesite mines and small occurrences in the state of Ceara form a sequence of lenses that extend, discontinuously, for over 140km. The magnesite rocks are hosted by metadolomites with lutecite, sulphate nodules pseudomorphosed by fiber-radiated quartz, scapolite and dissolution breccias. This metacarbonate sequence is more voluminous and more calcic in the southwestern extremity ofthe belt, but ...

Date: 2022 | Origin: Oasisbr

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Caracterização das inclusões fluidas dos topázios imperiais da região de Ouro P...

Gandini, Antônio Luciano; Bello, Rosa Maria da Silveira; Fuzikawa, Kazuo; Svizzero, Darcy Pedro; Ferreira, Claudio Meilman

Um grande número de inclusões fluidas de dimensões, orientações e morfologias variadas, bifásica à temperatura de 2S°C, ocorre no topázio imperial da região de Ouro Preto. Estudos microtermométricos desses Vários tipos de inclusões mostraram que elas são constituídas essencialmente por soluções aquosas e CO2; possuem, ainda, salinidades e temperaturas mínimas de formação semelhantes, quaisquer que sejam suas mo...

Date: 2014 | Origin: Oasisbr

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Neoproterozoic granitoid suites in southeastern Brazil.

Bilal, Essaid; Horn, Adolf Heinrich; Nalini Júnior, Hermínio Arias; Mello, Fernando Machado de; Neves, José Marques Correia; Giret, Andre Roger

Neoproterozoic granitoid suites in southeastern Brazil are closely related to the different tectonic events. Petrography, geochemistry and structural features allow to separate these rocks into pre-, syn-, late and post-tectonic granitoids. The whole emplacement process lasted less than 100 Ma: from 595 Ma for the pre-tectonic granitoids, to 500 Ma for the post-tectonic ones. During this interval a 45 Ma magmat...

Date: 2014 | Origin: Oasisbr

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