Alteração hidrotermal e fluidos mineralizantes no alvo Jerimum de Baixo, Campo Mineralizado do Cuiú-Cuiú, Província Aurífera do Tapajós: um estudo baseado em petrografia, inclusões fluidas e química mineral

Oliveira, Helder Thadeu de; Borges, Régis Munhoz Krás; Klein, Evandro Luíz; Lamarão, Cláudio Nery; Marques, Gisele Tavares; Lima, Rafael

doi:10.11606/issn.2316-9095.v19-142134

Cited by 2 publications

(9 citation statements)

References 33 publications

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“…1.98 Ga monzodiorite and monzogranite (e.g., São Jorge; Figure 3D), and ca. 1.89 to 1.91 Ga diorite, hornblende-biotite monzogranite, granodiorite, tonalite (e.g., Cuiú-Cuiú camp, São Jorge, and Ouro Roxo [3,108,[121][122][123].…”

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

“…The granitoids underwent pervasive and fissure-controlled hydrothermal chloritic, sericitic, carbonate, propylitic alteration, and silicification [10,101,108,109,121,124,125]. Replacement of igneous feldspars by hydrothermal K-feldspar, as a result of potassic alteration, was recognized in the Guarim [10] and São Jorge [124] deposits.…”

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

“…The gold particles occur in low-(1-2 g/t Au) and high-grade (>10 g/t Au) quartz veins related to a higher sulfide content and intensity of sericitic alteration. Gold is associated with pyrite, pyrrhotite, chalcopyrite, galena, sphalerite, magnetite, and minor molybdenite, hessite, bismuthinite, native bismuth and silver [9,101,108,121,122,124,125].…”

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

“…and homogenization temperature (104 to 410 • C); (ii) aqueous-carbonic (H 2 O-CO 2 -NaCl) fluid with salinities between 1.6 to 19 wt.% NaCl eq. and homogenization temperature of 114 to 448 • C; and (iii) carbonic (CO 2 -rich) fluids [9,10,90,101,[108][109][110]121,124]. These data were interpreted as suggestive of evolution from a metamorphic aqueous-carbonic fluid channeled within the brittle-ductile faults, which underwent immiscibility and pressure fluctuations (e.g., Guarim; [9,10]) possibly with a contribution of magmatic brines [90].…”

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

“…These granite-hosted deposits and targets were considered similar to orogenic gold deposits [9,109] or associated with an intrusion-related gold system [90,101,108,110].…”

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

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Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal–Porphyry and Related Deposits

et al. 2021

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This review paper aims to integrate geological, tectonic and metallogenetic data, including new data, and propose a regional model for the gold (and base metal) mineralization in the south Amazonian Craton to support the mineral exploration concerning magmatic–hydrothermal deposits. The Proterozoic evolution of the Amazonian Craton comprises the accretion of terrains to the Archean Carajás Mineral Province. In the Tapajós and Juruena mineral provinces, located at the south part of the Amazonian craton, a long-lived ocean–continent subduction event produced ca. 2.0 to 1.77 Ga continental magmatic arcs. Extensive lava flows, volcaniclastic, sedimentary, and plutonic rocks were originated during at least four major orogenic magmatic events (ca. 2.1, 1.9, 1.88, and 1.80 Ga) and two post- to anorogenic events (ca. 1.87 and 1.77 Ga). Gold mineralization occurs in: (i) alluvial/colluvial occurrences, (ii) orogenic carbonate–sulfide-rich quartz veins in shear zones, (iii) stockworks, veins, and dissemination in granites, (iv) contact of basic dikes, (v) well-preserved high-, intermediate- and low-sulfidation epithermal mineralization, and (vi) porphyry-like and intrusion-related gold systems associated with late- to post-orogenic epizonal granites. The estimated historical gold production, mainly in secondary deposits, is over 27 Moz at the Tapajós and 6 Moz at the Juruena provinces. A total resource of over 5 Moz Au is currently defined in several small to large primary gold deposits. Andesite to rhyolite, volcaniclastic, and clastic sedimentary rocks (1.96–1.88 Ga) host epithermal (high-, intermediate-, and low-sulfidation) Au–(Ag–Pb–Zn) mineralization, whereas Au–Cu and Cu–M–Au mineralization is hosted in sub-volcanic tonalitic to granitic plutons. Advanced argillic alteration (alunite, pyrophyllite, enargite) associated with high-sulfidation mineralization occurs in ring volcanoes around nested volcanic calderas. This zone grades outward to propylitic or chlorite alteration, often covered by silica caps with vuggy silica. Lava flows and volcaniclastic rocks within faults or associated with volcanic edifices and rhyolitic domes host low- and intermediate-sulfidation mineralization. Low-sulfidation alteration zones typically have adularia and illite or sericite. Chalcopyrite, sphalerite, galena, pyrite, digenite, and manganiferous calcite are related to intermediate-sulfidation gold mineralization. Late- to post-orogenic evolved oxidized I-type granitoids host alkalic-type epithermal and porphyry-like gold mineralization. Porphyry-style hydrothermal alteration is analogous to those of modern systems, with inner sodic and potassic (potassic feldspar ± biotite or biotite) alterations grading to propylitic, muscovite-sericite, chlorite–sericite, and chlorite alterations. Potassic alteration zones are the locus of Cu–Mo mineralization, and gold-rich zones occur in muscovite/sericite–quartz–pyrite alteration. The Paleoproterozoic epithermal and porphyry-like mineralization in these large provinces defines a new frontier for the exploration of world-class gold deposits in the worldwide Proterozoic arc-related magmatic terrains.

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Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

“…These granite-hosted deposits and targets were considered similar to orogenic gold deposits [9,109] or associated with an intrusion-related gold system [90,101,108,110].…”

Section: Structurally-controlled Granite-hosted Gold Depositsmentioning

confidence: 99%

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Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal–Porphyry and Related Deposits

et al. 2021

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Large igneous provinces of the Amazonian Craton and their metallogenic potential in Proterozoic times

Reis

Teixeira

D’Agrella-Filho

et al. 2021

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This paper overviews the Proterozoic Large Igneous Provinces of the Amazonian Craton, characterized by large volumes of extrusive and intrusive magmatic rocks. We reassess the geologic, geochronologic and geochemical information to stablish three intracontinental felsic volcanic-plutonic igneous belts (i.e., SLIPs), namely: Orocaima (1.98-1.96 Ga), Uatumã (1.88-1.87 Ga) and Alta Floresta (1.80-1.79 Ga). The Avanavero LIP (1.79-1.78 Ga), as well as the Rincón del Tigre-Huanchaca LIP (1.11 Ga) are also revisited. The relationships of these events with intraplate settings through time and space are apparent. We examine the main characteristics of each magmatic event in light of the U-Pb zircon and baddeleyite ages and coupled isotopic-geochemical constraints, the geodynamic significance, and metallogenetic potential. The Uatumã and Alta Floresta SLIPs host the most important mineral resources within the Amazonian Craton. Global barcode matches of the Proterozoic SLIPS/LIP events of Amazonia are also addressed, as well as their possible links with geologic time-scale periods: the Orosirian, Statherian and Stenian boundaries. We also evaluate the available paleomagnetic data to address issues related to the barcode match of such SLIP/LIP events in the context of supercontinent cycles.

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Alteração hidrotermal e fluidos mineralizantes no alvo Jerimum de Baixo, Campo Mineralizado do Cuiú-Cuiú, Província Aurífera do Tapajós: um estudo baseado em petrografia, inclusões fluidas e química mineral

Cited by 2 publications

References 33 publications

Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal–Porphyry and Related Deposits

Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal–Porphyry and Related Deposits

Large igneous provinces of the Amazonian Craton and their metallogenic potential in Proterozoic times

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