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      Morphological and compositional study of quartz and cassiterite of the Mocambo Granite, South Pará Tin Province, Amazonian Craton

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          Abstract

          Abstract Quartz and cassiterite crystals of granite, greisens, and quartz veins from Mocambo Granite, Carajás Province, were studied by scanning electron microscopy — cathodoluminescence and electron microprobe. Five types of quartz were identified: Qz1, magmatic and Qz2, Qz3, Qz4, and Qz5 hydrothermal. Qz1, anhedric to subhedric, luminescent and fractured at different intensities, predominating in less evolved rocks. Qz2, with low luminescence, is younger than Qz1; it occurs as irregular patches, filling fractures or forming veins that cut Qz1. Qz3, non-luminescent, resulting from continuous alteration, dissolution, and recrystallization processes; fills fractures that cut Qz1 and Qz2. Qz4 occurs in the most evolved and hydrothermalized rocks and in greisens bodies mineralized in cassiterite; is euhedral to subhedral, exhibits well-defined zoning, and has been interpreted as later than the previous one. Qz5 has poor luminescence; occurs in mineralized veins with wolframite and, secondarily, cassiterite. Qz1 shows Ti enrichment, while Qz4 associated with cassiterite is enriched with Al. Well-formed cassiterite crystals exhibit concentric zoning and low Fe, Ti, W, Nb and Mn contents. Qz5-associated cassiterite crystals form inclusions in the wolframite, suggesting that cassiterite and wolframite precipitated from hydrothermal processes at different times.

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          Most cited references 40

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          A-type granites: geochemical characteristics, discrimination and petrogenesis

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            Chemical subdivision of the A-type granitoids:Petrogenetic and tectonic implications

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              Insights from quartz cathodoluminescence zoning into crystallization of the Vinalhaven granite, coastal Maine

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                Author and article information

                Journal
                bjgeo
                Brazilian Journal of Geology
                Braz. J. Geol.
                Sociedade Brasileira de Geologia (São Paulo, SP, Brazil )
                2317-4889
                2317-4692
                2020
                : 50
                : 4
                Affiliations
                Belém Pará orgnameUniversidade Federal do Pará orgdiv1Instituto de Geociências Brazil rubembarrosnt@ 123456gmail.com
                Curitiba Paraná orgnameUniversidade Federal do Paraná Brazil cristinavpc@ 123456ufpr.br
                Belém Pará orgnameUniversidade Federal do Pará orgdiv1Laboratório de Microanálises Brazil
                Belém Pará orgnameUniversidade Federal do Pará Brazil
                Article
                S2317-48892020000400306 S2317-4889(20)05000400306
                10.1590/2317-4889202020190096

                This work is licensed under a Creative Commons Attribution 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 47, Pages: 0
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