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Title: Fluids associated with the caxias mesothermal gold mineralization, São Luiz Croton, Northern Brazil: a fluid inclusion study
Title of periodic: Revista Brasileira de Geociências
Authors: Klein, Evandro Luiz
Fuzikawa, Kazuo
Koppe, Jair Carlos
Dantas, Maria Sylvia Silva
Affiliation: Companhia de Pesquisa de Recursos Minerais/CPRM, Belém, PA, Brasil
Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Federal do Rio Grande do Sul/UFRGS, Porto Alegre, RS, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, Mg, Brasil
Issue Date: 2000
Keywords: Gold;São Luís;Brazil;fluid inclusions
Abstract: The Caxias deposit is situated in the Gurupi Auriferous Province of the Paleoproterozoic São Luís Craton, northern Brazil. It is a lode-type gold mineralization associated with a narrow, steeply dipping, NE-trending, shear zone crosscutting a hydrothermalized microtonalite (northern sector) and schists (southern sector). Fluid inclusion studies on vein quartz crosscutting the microtonalite (northern sector) have identified early carbonic and aqueous-carbonic inclusions and late aqueous inclusions, unrelated to the mineralizing event. The CO2/ H2O ratio and the other microthermometric properties show a wide range of values, which are interpreted as product of heterogeneous trapping of two (partially) immiscible fluids and to deformation-related post-formational processes.
Access: L
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