Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Carajás Domain, Amazonian Craton, Brazil
| العنوان: | Multiple sulfur isotopes constraints on origin and evolution of the Neoarchean and Paleoproterozoic Cu-Au systems from the Carajás Domain, Amazonian Craton, Brazil |
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| المؤلفون: | Steffen G. Hagemann, J. Cliff, Érika Suellen Barbosa Santiago, Roberto Perez Xavier, Lena Virgínia Soares Monteiro |
| المصدر: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | geography, geography.geographical_feature_category, 020209 energy, Archean, Geochemistry, chemistry.chemical_element, Geology, 02 engineering and technology, 010502 geochemistry & geophysics, Iron oxide copper gold ore deposits, Mass-independent fractionation, ESPECTROMETRIA DE MASSAS, 01 natural sciences, Sulfur, Metallogeny, Volcanic rock, Craton, δ34S, chemistry, Geochemistry and Petrology, 0202 electrical engineering, electronic engineering, information engineering, Economic Geology, 0105 earth and related environmental sciences |
| الوصف: | Multiple sulfur isotopes in sulfides were measured by in situ Secondary Ion Mass Spectrometry in order to constrain sulfur sources and pathways, as well as explore atmosphere–ore genesis implications on the metallogeny of the Neoarchean and Paleoproterozoic Cu-Au systems of the Carajas Domain, southeast Amazonian Craton, Brazil. All of the investigated Neoarchean (2.70–2.57 Ga; i.e., Salobo, Igarape Bahia, Castanha and Sequeirinho) and Paleoproterozoic IOCG (ca 1.88 Ga; i.e., Alvo 118 and Sossego) deposits show Δ33S 0‰ (+0.08‰ to + 0.27‰), implying that sulfur underwent mass-independent fractionation (MIF). In addition, three distinct δ34S ranges are defined: −3.07‰ to + 3.01‰ and + 2.17‰ to + 4.68‰ for the Neoarchean and Paleoproterozoic IOCG deposits, respectively, and −0.46‰ to + 3.81‰ for the Paleoproterozoic Breves deposit. In the Neoarchean IOCG deposits, sulfur is most likely of mantle/magmatic origin. However, a subtle but detectable MIF-S signature reflects the inheritance of a minor sulfur component transported to the atmosphere, experienced photolytic reactions and returned to the hydrosphere. The interaction between highly saline, hot, and deep-seated metalliferous fluids with the host rocks, including sulfate-bearing volcanic rocks that underwent seafloor alteration, may account for the small negative Δ33S values in the IOCG deposits. The similarity between the negative Δ33S signatures of the Neoarchean and the Paleoproterozoic IOCG deposits (i.e., Sossego and Alvo 118) suggest that the MIF signatures recorded by the latter most likely reflect inheritance of Neoarchean sulfur with MIF signatures acquired by large scale fluid-rock interaction triggered by the ca 1.88 Ga A-type granitic magmatism. The positive Δ33S values of sulfides from the Paleoproterozoic Breves deposit, in contrast, were probably generated by reduced sulfur species sourced from crustal sources (e.g., Archean pyrite-bearing sedimentary units) in addition to magmatic sulfur related to ca. 1.88 Ga A-type granite emplacement. |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3982084f798877c02099b8399e301c90 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....3982084f798877c02099b8399e301c90 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |