Timing and evolution of multiple Paleoproterozoic magmatic arcs in the Tapajós Domain, Amazon Craton: constraints from SHRIMP and TIMS zircon, baddeleyite and titanite U–Pb geochronology

Santos, João Orestes Schneider; Breemen, O.B. Van; Groves, David; Hartmann, Léo Afrâneo; Almeida, Marcelo Esteves; McNaughton, Neal J.; Fletcher, Ian R.

doi:10.1016/j.precamres.2004.01.002

Cited by 101 publications

(113 citation statements)

References 35 publications

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“…The metamorphic units were intruded by batholiths of high-K, calc-alkaline granites of the Creporizão Intrusive Suite (1997to 1956, and covered by felsic to intermediate volcanic and volcanoclastic rocks of the Vila Riozinho Formation. Both units show field and geochemical characteristics of mature magmatic arc to postcollision rock associations (Lamarão et al 2002;Santos et al 2004;Guimarães et al 2015;Vasquez et al 2017).…”

Section: Tapajós Gold Provincementioning

confidence: 99%

“…The orogenic period, which spans from 2.03 Ga to 1.95 Ga, was preceded by the deposition of the Castelo dos Sonhos Formation (see next section), and started with the formation of subduction-related associations, represented by gneisses and granitoids of the Cuiú-Cuiú Complex (2033to 2005, formed in continental arc. This complex is associated with the metavolcano-sedimentary Jacareacanga Group (<1972 Ma), and with undeformed and unmetamorphosed calcalkaline felsic to intermediate volcanic and pyroclastic rocks of the Comandante Arara Formation (Santos et al 2004;Vasquez et al 2017 and references therein). The metamorphic units were intruded by batholiths of high-K, calc-alkaline granites of the Creporizão Intrusive Suite (1997to 1956, and covered by felsic to intermediate volcanic and volcanoclastic rocks of the Vila Riozinho Formation.…”

Section: Tapajós Gold Provincementioning

confidence: 99%

“…50 Ma, other plutonic-volcanic events have taken place in the Tapajós Gold Province. These started with the intrusion of calc-alkaline tonalite to granite of the Tropas Intrusive Suite (1907 to 1892 Ma), and of voluminous batholiths and stocks of high-K calc-alkaline granodiorite and subordinate tonalite and granite of the Parauari Intrusive Suite (1883 to 1879 Ma) and coeval gabbros (Santos et al 2004;Vasquez et al 2017 and references therein). The tectonic setting of this voluminous magmatism is equivocal, and both continental arc (Santos et al 2004;Juliani et al 2015) and extensional/intracontinental (Vasquez et al 2008;Klein et al 2017) settings have been proposed.…”

Section: Tapajós Gold Provincementioning

confidence: 99%

“…1895 Ma onward and was filled by alkaline volcanic and pyroclastic rocks of the Iriri Group (1895 to 1864 Ma), which were intruded by the coeval alkaline granites of the Maloquinha Intrusive Suite (Santos et al 2004;Vasquez et al 2008). The clastic/ volcanoclastic sediments of the Novo Progresso Formation (<1840 Ma, Klein et al 2018) are also associated with this event, which is ascribed to the formation of the Uatumã Silicic Large Igneous Province (Klein et al 2012 and references therein).…”

Section: Tapajós Gold Provincementioning

confidence: 99%

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The Paleoproterozoic metaconglomerate-hosted Castelo de Sonhos gold deposit, Tapajós Gold Province, Amazonian Craton: a modified paleoplacer origin

Queiroz¹,

Klein

2018

JGSB

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The Castelo de Sonhos gold deposit (~1.5 Moz Au) is located in the southeastern Tapajós Gold Province and is hosted in variably deformed metaconglomerates and metasandstones of the Castelo dos Sonhos Formation, which was deposited between 2011 and 2050 Ma and considered to be a relic of a major foreland system. Gold is found mainly in the matrix of metaconglomerates and subordinately in fractures of metasandstones. The host rocks are strongly silicified, which was demonstrated to be the result of silica overgrowth during diagenesis, without relationship to hydrothermal alteration. The rocks are also impregnated with secondary iron oxides, which are interpreted to be consequence of weathering of the metasedimentary sequence and total or partial dissolution of iron-bearing minerals and re-precipitation of iron during circulation of oxidized (meteoric and/or magmatic) fluids. The morphology of matrix gold particles indicates that they are not pristine, but only slightly modified and reshaped, which suggests detrital provenance and relatively proximal distance of transport from the original sources. The chemical composition of the particles, with Au grading 94-97%, very high Au/ Ag and lack of other significant metals, suggest single source, or sourcing from a single class (orogenic?) of gold deposits. The gold particles from fractures are platy and show even higher Au/Ag ratios, given by very low Ag contents (<<1%), which are interpreted as epigenetic remobilization of the matrix gold. Oxygen isotope compositions of hydrothermal quartz-sulfide-muscovite veins cutting across the host metasedimentary sequence indicate magmatic origin for the fluids, which might have been produced by granites that intruded the metasedimentary rocks and helped gold remobilization to fractures. As a consequence, Castelo de Sonhos is interpreted as a modified paleoplacer gold deposit.

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Section: Tapajós Gold Provincementioning

confidence: 99%

Section: Tapajós Gold Provincementioning

confidence: 99%

Section: Tapajós Gold Provincementioning

confidence: 99%

Section: Tapajós Gold Provincementioning

confidence: 99%

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The Paleoproterozoic metaconglomerate-hosted Castelo de Sonhos gold deposit, Tapajós Gold Province, Amazonian Craton: a modified paleoplacer origin

Queiroz¹,

Klein

2018

JGSB

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“…Nessa concepção, Santos et al (2000Santos et al ( , 2004 descreveram o evento orogênico Tapajós-Parima como sendo formado por diácronos arcos magmáticos cálcio-alcalinos (2,05-1,88 Ga), que pelo processo de fusão parcial em altas temperaturas (>800ºC) e baixa pressão produziram uma assembléia vulcano-plutônica pós-colisional representada pela Suíte Intrusiva Maloquinha e pelo Grupo Iriri, considerados correlatos aos plutono-vulcanismo tipo A da área de estudo (Valério et al 2006a). Na porção sul dessa província, região do Rio Tapajós, Vasquez et al (2002) discutiram a mudança do magmatismo cálcio-alcalino orogênico para alcalino pós-orogênico e alertaram para a estreita associação espacial e temporal dos granitóides calcialcalinos e alcalinos nessa região.…”

Section: Discussõesunclassified

Geoquímica E Geocronologia Pb-Pb Em Zircão Da Suíte Intrusiva Água Branca, Município De Presidente Figueiredo (Am): Evidências De Colisão No Paleoproterozóico Da Amazônia Ocidental

Valério

Souza

Macambira

et al. 2006

RBG

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Resumo Os granitóides cálcio-alcalinos que ocorrem no Município de Presidente Figueiredo (AM) são representados por sienogranitos, monzogranitos e termos dioríticos porfiríticos, equigranulares, miloníticos e granofíricos da Suíte Intrusiva Água Branca. Essa unidade é caracterizada como uma série granítica que apresenta valores expandidos em SiO 2 , Al 2 O 3 , Fe 2 O 3(total) , MgO, CaO e Na 2 O+K 2 O e relativa homogeneidade na razão Fe/Mg, o que sugere magmas da Série Granodiorítica Cálcio-alcalina. Os elevados teores em Ba, Sr e Rb/Zr e baixos valores em Nb, Rb, Ta, Zr, Zn, Y, K/Rb e ETRL da SIAB, aliados ao padrão de distribuição dos ETR e multielementos, indicam um ambiente sin-colisional com formação de arco magmático, geração de rochas cálcio-alcalinas meta a peraluminosas de médio a alto-K, do tipo I normal ou pouco fracionadas. A forte homogeneidade entre o padrão de distribuição de elementos compatíveis e incompatíveis das rochas da SIAB em relação às rochas de ambiente tipicamente sin-e pós-colisional, contribui com a proposta de um regime colisional envolvendo os processos finais de colagem, subducção de uma paleoplaca oceânica contra o protocráton Amazônico (Província Amazônia Central), subseqüente construção da Província Ventuari-Tapajós, associados ao magmatismo Água Branca, gerado há ca. 1,89 Ga. As avaliações geológicas, geoquímicas e geocronológicas sugerem uma correlação estratigráfica entre a Suíte Intrusiva Água Branca, na área de estudo e a Suíte Intrusiva Tropas (Parauari), na Província Aurífera Tapajós, porção sul da Província Ventuari-Tapajós.Palavras-chave: granitóides cálcio-alcalinos, Paleoproterozóico, geocronologia de zircão, Escudo das Guianas. Abstract GEOCHEMISTRY AND Pb-EVAPORATION ZIRCON GEOCHRONOLOGY OF THE ÁGUA BRANCA INTRU-SIVE SUITE, PRESIDENTE FIGUEIREDO DISTRICT: EVIDENCE OF THE PALEOPROTEROZOIC COLLISION IN WEST-ERN AMAZONIANThe calc-alkaline granitoids of the President Figueiredo district, Amazonas State, Brazil, are represented by syenogranites, monzogranites and diorites of the Água Branca Intrusive Suite that display porphyry, equigranular, mylonitic and granophiric textural variation. This unit is characterized as a granitic series that presents expanded values of SiO 2 , Al 2 O 3 , Fe 2 O 3(total) , MgO, CaO and Na 2 O+K 2 O, and relative homogeneity in Fe/Mg ratio, suggesting an origin from magmas of the calcalkaline granodioritic series. The high values in Ba, Sr and Rb/Zr, and low values in Nb, Rb, Ta, Zr, Zn, Y, K/Rb and LREE of Água Branca Intrusive Suite, added to the REE and multi-elements distribution pattern, indicate a sin-collisional tectonic setting with formation of magmatic arc and generation of rocks with metaluminous to peraluminous, calc-alkaline from medium to high-K and I normal type or weakly fractionated geochemical characteristics. The strong homogeneity between compatible and incompatible elements distribution of the Água Branca Intrusive Suite rocks and typically sin-to post-collision rocks, contributes with a proposal of a collision regime ...

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K–Ar mineral ages and thermal history of magmatic and metamorphic Palaeoproterozoic units from the northern part of Kedougou Kenieba Inlier, West African Craton (Eastern Senegal)

et al. 2015

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The northern part of the Kedougou Kenieba Inlier (Eastern Senegal) is composed of Palaeoproterozoic volcano-plutonic and volcanosediment areas cross-cut by differentiated plutonic bodies of gabbroic to granitic composition. They are emplaced in an arc-type environment and accreted during the Eburnean Orogeny. We present here new K-Ar ages obtained on several plutons from different mineralogical phases, each characterized by a different closure temperature for the K-Ar system. Ages from hornblende, between 2013 ± 29 and 2141 ± 30 Ma, constrain the cooling history of the magma bodies through the 550°C isotherm. They are slightly younger than U-Pb ages previously obtained from the same units, attesting of a rapid cooling, tectonically controlled, of about 7°C/Myr. Ages obtained on biotite minerals range from 1955 ± 28 to 1893 ± 27 Ma, suggesting that from 550 to 325°C, cooling rate decreased to about 3°C/Myr. Significantly younger ages ranging from 1704 ± 24 to 1615 ± 23 Ma have been obtained on plagioclase and microcline. They can be interpreted in terms of either a slow cooling with a rate of only 1°C/Myr, from about 1.9 to 1.6 Ga, or either reflecting the occurrence of a rather limited thermal event younger than 1.7 Ga. Since no age younger than 2.0 Ga has previously been obtained for plutonic rocks from the early Birimian in the West African Craton, ages of 1.7-1.6 Ga obtained here from feldspars might be the first evidence for a regional re-heating event having occurred in the East-North Kedougou Kenieba inlier.

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Timing and evolution of multiple Paleoproterozoic magmatic arcs in the Tapajós Domain, Amazon Craton: constraints from SHRIMP and TIMS zircon, baddeleyite and titanite U–Pb geochronology

Cited by 101 publications

References 35 publications

The Paleoproterozoic metaconglomerate-hosted Castelo de Sonhos gold deposit, Tapajós Gold Province, Amazonian Craton: a modified paleoplacer origin

The Paleoproterozoic metaconglomerate-hosted Castelo de Sonhos gold deposit, Tapajós Gold Province, Amazonian Craton: a modified paleoplacer origin

Geoquímica E Geocronologia Pb-Pb Em Zircão Da Suíte Intrusiva Água Branca, Município De Presidente Figueiredo (Am): Evidências De Colisão No Paleoproterozóico Da Amazônia Ocidental

K–Ar mineral ages and thermal history of magmatic and metamorphic Palaeoproterozoic units from the northern part of Kedougou Kenieba Inlier, West African Craton (Eastern Senegal)

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