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Empirical Bi (sub 8) Te (sub 3) and Bi (sub 2) Te from the Sao Sebastiao gold deposit, Brazil; implications for lode-gold mineralization in Minas Gerais

Alexandre Raphael Cabral and Atlas Vasconcelos Correa Neto
Empirical Bi (sub 8) Te (sub 3) and Bi (sub 2) Te from the Sao Sebastiao gold deposit, Brazil; implications for lode-gold mineralization in Minas Gerais
The Canadian Mineralogist (November 2015) 53 (6): 1061-1072

Abstract

Sao Sebastiao is a recently discovered gold deposit in the Pitangui greenstone belt, Minas Gerais, Brazil. Part of its hydrothermal system is characterized by chaotically distributed tourmaline that is concentrated in patchy domains, or pockets. The tourmaline-rich pockets obliterate the foliation of the host greenstones. Pyrrhotite and late chalcopyrite occur in the tourmaline-rich pockets. Bismuth, bismuth-gold intermetallic aggregates, and Bi-telluride minerals locally fill microfractures that are superimposed on preexisting, chalcopyrite-bearing microfractures in the tourmaline-rich pockets. Hedleyite (Bi (sub 7) Te (sub 3) ) as well as the unnamed minerals Bi (sub 8) Te (sub 3) and Bi (sub 2) Te are noteworthy. Specifically, hedleyite and Bi (sub 8) Te (sub 3) make up composite aggregates with joseite-B (Bi (sub 4) Te (sub 2) S) in which the Bi (sub 8) Te (sub 3) is unambiguously distinguished from hedleyite, both optically and compositionally. The Au-Bi-Te mineral assemblages indicate precipitation below about 270 degrees C, under epizonal conditions, in a mesothermal (orogenic) setting. Comparison with the economically and historically important Passagem de Mariana gold mine shows similarities that are indicative of a possible widespread, but still poorly recognized, epizonal overprint in Minas Gerais.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 53
Serial Issue: 6
Title: Empirical Bi (sub 8) Te (sub 3) and Bi (sub 2) Te from the Sao Sebastiao gold deposit, Brazil; implications for lode-gold mineralization in Minas Gerais
Affiliation: Technische Universitaet Clausthal, Mineral Deposits, Clausthal, Germany
Pages: 1061-1072
Published: 201511
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 35
Accession Number: 2016-096743
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
S23°30'00" - S14°00'00", W51°00'00" - W39°45'00"
Secondary Affiliation: Universidade Federal do Rio de Janeiro, BRA, Brazil
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201647
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