Vulcanismo Basáltico De Afinidade Shoshonítica Em Ambiente De Arco Arqueano, Grupo Grão-Pará, Serra Dos Carajás - Pará

MEIRELLES, MARCELO R.; DARDENNE, MARCEL A.

doi:10.25249/0375-7536.19914150

Cited by 28 publications

(9 citation statements)

References 25 publications

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“…The tectonic setting of the supracrustal units has been attributed to a ca. 2.76 Ga intracontinental rift (Wirth et al 1986, Docegeo 1988, Macambira 2003 or volcanic arc (Meirelles & Dardenne 1991, Teixeira 1994, Lindenmeyer et al 2005, Lobato et al 2005 built over the > 2.83 Ga Mesoarchean basement. Between 2.76 and 2.70 Ga, the CD is marked by the deposition of the volcano-sedimentary sequences of the Itacaiúnas Supergroup (Docegeo 1988) and mafic-ultramafic and granitic plutonism.…”

Section: Geological Setting Of the Carajás Domainmentioning

confidence: 99%

The Cristalino IOCG deposit: an example of multi-stage events of hydrothermal alteration and copper mineralization

2019

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The Cristalino deposit is located 40 km east of Sossego mine, Carajás. The orebody lies along a NW-SE-striking shear zone and is mainly hosted by the Neoarchean bi-modal volcanics of the Grão Pará Group. Field work and petrographic data seconded by SEM-EDS analysis allowed recognizing an early sodic metasomatism that was followed by calcic-ferric, potassic and propylitic alterations, and finally by carbonatization. The volcanic rocks were altered under deformation regimes that changed from ductile-brittle to brittle. The deposit resulted from two mineralizing stages. The early stage took place at a greater depth and produced an ore association composed chiefly of chalcopyrite, pyrite, and magnetite as disseminations, breccia and veins particularly in CaFe altered rocks. The later stage occurred at a shallower depth and formed a practically magnetite-free ore association, consisting essentially of chalcopyrite ± pyrite ± hematite in breccias and veins generated mostly during the potassic alteration. These ore associations indicate that the hydrothermal system evolved with temperature decrease and increase in fO 2, Cu/Fe ratio and sulfur activity. Cristalino is conceived as a multi-stage IOCG deposit similar to others lying in the Carajás E-W corridor of IOCG systems.

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Section: Geological Setting Of the Carajás Domainmentioning

confidence: 99%

The Cristalino IOCG deposit: an example of multi-stage events of hydrothermal alteration and copper mineralization

2019

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“…At least three tectonic models have been proposed to describe the evolution of the Carajás Domain: (i) formation of a pull-apart basin (Carajás Basin) during a dextral transtension, subsequently tectonically inverted to positive flower structures by sinistral transpression (Araújo et al 1988); (ii) formation during continental rifting related to mantleplume activity (Tallarico 2003);and;(iii) formation in a volcanic arc setting related to subduction processes (Meirelles 1986;Dardenne et al 1988;Meirelles and Dardenne 1991;Teixeira 1994;Lobato et al 2005;Silva et al 2005;Teixeira et al 2010). According to Tavares et al (2018), the recurrence of collisional-extensional events taking place from the Neoarchean (2.76-2.52 Ga) to the Paleoproterozoic (2.09-1.88 Ga) allowed the establishment of a rift-related system and subsequent formation of volcano-sedimentary sequences in the Carajás Domain, which evolved upon a previously stabilized basement substrate (ca.…”

Section: Geological Setting Of the Cmpmentioning

confidence: 99%

The Santa Lúcia Cu-Au deposit, Carajás Mineral Province, Brazil: a Neoarchean (2.68 Ga) member of the granite-related copper-gold systems of Carajás

et al. 2021

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The Santa Lúcia copper-gold deposit lies in the southeastern portion of the Carajás Mineral Province, along NW-SE splays of the Carajás Fault. The deposit is hosted by a rhyolitic subvolcanic rock, which is crosscut by pegmatite intrusions. The paragenetic evolution at Santa Lúcia encompasses an early stage of chlorite alteration, followed by potassic alteration with microcline, greisenization (quartz-muscovite-tourmaline), copper-gold ore precipitation and late sericite and hematite vein formation/fracture infill.Copper mineralization is dominantly represented by chalcopyrite-sphalerite-pyrrhotitepentlandite-pyrite breccias, which are spatially associated with greisen alteration and characterized by the enrichment of light rare earth elements (LREE), Ni, Co, and Cr. The alteration types, mineralization styles and ore assemblage suggest that the Santa Lúcia deposit could represent a member of the Paleoproterozoic (ca. 1.88 Ga) graniterelated copper-gold systems of Carajás (e.g., the Breves and Estrela deposits). However, the in-situ U-Pb analyses of ore-related monazite yield a weighted average 207 Pb/ 206 Pb age of 2688 ± 27 Ma, thereby constraining the timing of mineralization at Santa Lúcia to the Neoarchean. Moreover, tourmaline from the pegmatite and within the ore zones have a range of δ 11 B values from -3.7 to -0.6‰, therefore linked to a magmatic boron source. Collectively, these results indicate that the Santa Lúcia deposit is the first reduced magmatic-hydrothermal, iron oxide-poor system formed in the Neoarchean, coeval with the 2.72-2.68 Ga metallogenic event responsible for the genesis of important iron oxide copper-gold (IOCG) deposits in the Carajás Mineral Province.

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“…To the north, these lithologies are bounded by high-grade rocks (gneisses and migmatites) of Paleoproterozoic age (2.50-1.96 Ga) within older Archean terranes. Interpretations based on geological, bulk-rock geochemistry and isotopic data have led to two contrasting interpretations for the tectonic setting of the Carajás Basin: an intracontinental rift forming the Carajás basin [21,22] or a compressional arc-related setting [24].…”

Section: Geological Setting Of Carajás Mineral Province (Cmp) and Itsmentioning

confidence: 99%

On the origin of oldest Iron-Oxide-Copper-Gold (IOCG) deposits at the transition from Archean drip to plate tectonics

Ganade

Griffin²,

Weinberg

et al. 2020

Preprint

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Geological evidence supports a significant change in Earth’s behaviour in the mid- to late Archaean, between 3.2 and 2.5 Ga, reflecting stabilization of the lithosphere and replacement of vertical tectonics by linear imbricated belts. At the heart of this change, the oldest (c. 2.75 Ga) Iron-Oxide-Copper-Gold deposits (IOCG) were formed in the Carajás Mineral Province (CMP) of the Amazon craton. U-Pb ages, Lu-Hf isotopes and trace element composition of detrital zircons from modern drainages record the crystallization ages of the exposed rocks of the CMP. Combined with the geochemistry of Archean granitoids in the CMP, we recognize four different age and compositional groups: 3.01-2.92 Ga TTG, 2.87-2.83 Ga transitional TTG + sanukitoid + K-rich granitoids, 2.78-2.72 Ga A-type crustal granites accompanying IOCGs, and 2.59-2.53 Ga alkaline high-K intrusions accompanied by renewed IOCG mineralization. The first two groups have a dominantly juvenile isotopic signature whereas the last two have evolved Hf-isotope signatures, accompanied by increase in K2O/Na2O, reflecting addition of old crustal components in the melting sources over time. The older juvenile granitoids are associated with dome-and-keel structures typical of granite-greenstone terranes, whereas the younger granitoids were emplaced along a linear shear belt associated with new mafic-ultramafic intrusions and remelting of older TTG. Based on the tectono-magmatic evolution, we argue that metasomatism and fertilization of the underlying lithospheric mantle by incompatible elements, necessary for the development of IOCG deposits, were related to vertical drip-tectonics during development of the TTG proto-continent. This proto-continent made the lithosphere rigid enough to allow linear translithospheric deformation to localize at c. 2.85 Ga, allowing decompression melting of the metasomatized lithospheric mantle in a restricted extensional setting to form abundant mafic and A-type granitoids at c. 2.75 Ga, and the first IOCG deposits on Earth.

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Vulcanismo Basáltico De Afinidade Shoshonítica Em Ambiente De Arco Arqueano, Grupo Grão-Pará, Serra Dos Carajás - Pará

Cited by 28 publications

References 25 publications

The Cristalino IOCG deposit: an example of multi-stage events of hydrothermal alteration and copper mineralization

The Cristalino IOCG deposit: an example of multi-stage events of hydrothermal alteration and copper mineralization

The Santa Lúcia Cu-Au deposit, Carajás Mineral Province, Brazil: a Neoarchean (2.68 Ga) member of the granite-related copper-gold systems of Carajás

On the origin of oldest Iron-Oxide-Copper-Gold (IOCG) deposits at the transition from Archean drip to plate tectonics

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