Orosirian magmatic episodes in the erepecuru-trombetas domain (southeastern Guyana shield): Implications for the crustal evolution of the Amazonian craton

Leal, Rafael Estumano; Lafon, Jean Michel; Rosa-Costa, Lúcia Travassos da; Dantas, Elton Luiz

doi:10.1016/j.jsames.2018.04.011

Cited by 16 publications

(4 citation statements)

References 44 publications

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“…The older source has T DM ages compatible with the crystallization ages from the Orosirian magmatic episodes of the Erepecuru-Trombetas and Irirí-Xingu Domain (Leal et al 2018); in turn, the younger (more juvenile) source have T DM ages similar to the crystallization ages of the Ventuari-Tapajós Province formation stage (Cuiú-Cuiú -island arc; Creporizão -continental arc; Tropas -island arc/continental arc) (Santos et al 2004).…”

Section: The Volcano-plutonic Association Of the Volcanic Domain As Pmentioning

confidence: 76%

A review of the geodynamic setting of the Volcanic Domain in the Juruena Magmatic Arc, southwestern Amazon Craton, Brazil, based on geochemical, U-Pb and Sm-Nd data

Duarte

Xavier

Rodrigues

2019

JGSB

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Corresponding author Tiago B. DuarteIn SW Amazon Craton, along the boundary between the Ventuari-Tapajós (1.9 to 1.8 Ga) and the Rio Negro-Juruena (1.8 to 1.55 Ga) provinces, an association of volcanic rocks and related epizonal granitic plutons crop out as a volcanic belt with more than 600 km long. This set of rocks, here called the Volcanic Domain (VD), has been the target of several studies due to its metallogenic importance as well as to the understanding of the geodynamic evolution of the Southwestern Amazon Craton, and various geodynamic models are considered for this plutono-volcanism at about 1.8 Ga, including taphrogenesis, accretionary margin volcanic belt, and late-to post-orogenic extensional magmatism. In this work, based on whole rock geochemistry, and in U-Pb and Sm-Nd isotopic results we propose a geodynamic model that admit shifts in the tectonic regime through time and unifies the second and third interpretations above. We interpret the intermediate to acid, A-type, oxidized granitic and volcanic rocks from the Colíder Group and the Paranaíta Intrusive Suite as products of continental arc magmatism, whereas the acid, A-type reduced granitic and volcanic rocks resulted from late-stage extensional back-arc and forearc processes being respectively associated with the Teles-Pires Intrusive Suite and Roosevelt Group magmatism. The continental arc interpretation for the VD is supported by the following lines of evidence: (1) spatial arrangement of the VD in the shape of a volcanic belt; (2) the large volume of volcaniclastic deposits and related epizonal granitic intrusions; (3) variable chemical signatures ranging from subalkaline mafic compositions to high-K calc-alkaline, A-type oxidized granites, showing REE and trace element patterns similar to those of subcontinental lithospheric mantle sources enriched by subduction-zone fluids, and subordinate involvement of continental crust; (4) crystallization and Sm-Nd T DM model ages, respectively, ranging between 1820 and 1780 Ma, and from 2.40 to 1.84 Ga, with  Nd(t) values of -3.9 to +2.5, yielding an overlap in U-Pb and Sm-Nd ages of rocks from the Juruena Magmatic Arc; (5) the occurrence of epithermal-porphyry Au systems in the Alta Floresta Gold Province with ages compatible with those of the VD magmatic period.

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Section: The Volcano-plutonic Association Of the Volcanic Domain As Pmentioning

confidence: 76%

A review of the geodynamic setting of the Volcanic Domain in the Juruena Magmatic Arc, southwestern Amazon Craton, Brazil, based on geochemical, U-Pb and Sm-Nd data

Duarte

Xavier

Rodrigues

2019

JGSB

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“…The T DM model ages of the Água Branca Suite in the southern part of the Guiana Shield are predominantly Siderian and Rhyacian, and negative eNd values suggest a derivation from either crustal or juvenile sources (Almeida 2006). Nd Archean model ages were not encountered (Vasquez and Rosa-Costa 2008, Barreto et al 2013, Leal et al 2018. However, Semblano et al (2016), working with similar calc-alkaline granites of the Iriri-Xingu Domain of the Central Brazil Shield, indicated that some Archean crustal material may have been mixed with juvenile Paleoproterozoic material.…”

Section: Discussionmentioning

confidence: 99%

“…Pb evaporation ages of 1.88 Ga, and associated them with the Iricoumé Group. Moreover, Leal et al (2018), for the same region, determined U-Pb zircon ages for granitoids of the Mapuera and Água Branca suites (Table 1).…”

Section: Geology Of the Demêni-mocidade And Uatumã Domainsmentioning

confidence: 99%

https://jgsb.cprm.gov.br/index.php/journal/issue/view/24

Reis

Cordani²,

Goulart³

et al. 2021

JGSB

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The Demêni-Mocidade domain (DMD) comprises a large area of granitoid rocks, located on the border between the states of Roraima and Amazonas, Brazil, within the inner part of the Ventuari-Tapajós Province of the Amazonian Craton, where large amounts of granitoid rocks, formed between 2.0-1.8 Ga, are predominant. This study examines six granite samples collected from the Mocidade and Demêni mountains, which are related in time to the Uatumã Silicic Large Igneous Province (SLIP), which, in turn, covers several tectonostratigraphic domains whose evolution is associated with an intracontinental setting, allowing a common association with I-and A-type granitoid rocks formed within the same 1.88 to 1.87 Ga time interval. These rocks are monzogranites and correspond petrographically to holocrystalline anisotropic lithotypes with fine to medium grain sizes. Their textural relationships, including some lithotypes containing phenocrysts with oscillatory zoning and resorbed rims, indicate that crystallization occurred at subvolcanic or hypabyssal depths. Moreover, the association between plutonic and subvolcanic rocks in the same suite shows variations in the crustal development of the magmatic chambers. The granitoids of the DMD share a common geochemical signature with those of the Água Branca Suite, which occurs within the Uatumã and Trombetas-Erepecuru domains of the Guiana Shield, suggesting that their crystallization occurred in similar magmatic chambers. Six U-Pb zircon ages show that most zircon crystals are concordant and the few ones which are discordant are well aligned along Discordia straight lines descending to zero. The calculated Concordia ages, covering the 1884 to 1877 Ma interval, agree within experimental error, indicating a probably similar crystallization age. Such apparent age values, close to 1900 Ma for the DMD, made it possible for the domain of the Uatumã SLIP to spread to the West, and the area of the Ventuari-Tapajós Province could extend towards the Amazonas State of Venezuela. Finally, the coexistence between I-and A-type granitoids in the DMD, with ages within the range 1.88-1.87 Ga, stimulates a discussion, and there are three possibilities: (1) The calc-alkaline magmatism can be associated with late (post-collisional) processes related to subduction.(2) The granitoid rocks are formed in an intracontinental setting under more stable (post-orogenic) tectonic conditions. (3) The granitoid rocks are predominantly formed by A-type and alkaline magmatism in intraplate settings.

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“…However, a weak negative ε Nd (-2.8) and Siderian T DM model age (2.4 Ga) of one I-type granite of the western part of the domain suggests mixing of Archean crustal with Paleoproterozoic juvenile material (Semblano et al 2016). This juvenile source is stronger in the continuation of the Central Amazonian province in the Guiana shield, as shown in the ε Nd -3.0 to 2.9 and T DM 2.39 to 1.95 Ga of igneous rocks of 1.99-1.98 Ga and 1.89-1.88 Ga (Barreto et al 2014, Leal et al 2018. Based on Nd isotope data and absence of Archean heritage, Barreto et al (2014) have supported a discussion on the occurrence of the Central Amazonian province in this shield and the east limit of Ventuari-Tapajós province.…”

Section: Geology Of the Iriri-xingu Domainmentioning

confidence: 90%

U-Pb SHRIMP dating of basement rocks of the Iriri-Xingu domain, Central Amazonian province, Amazonian craton, Brazil

et al. 2019

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The Iriri-Xingu domain, located in the central part of the Amazonian craton, consists of extensive occurrences of Paleoproterozoic volcanic rocks and granites with published ages of ca. 1990 to 1840 Ma, which show a strong crustal contribution for their magmas. Exposures of basement rocks are small and rare. Samples from two areas were dated in this work by U-Pb SHRIMP in zircon. In the northern Maribel area, a high-grade pelitic paragneiss presented an age of 2160 ± 8 Ma and the leucosome of a migmatitic orthogneiss, probably a diatexite, crystallized at 2149 ± 20 Ma. These Rhyacian ages suggest that it is part of the Bacajá domain, related to the Trans-Amazonian cycle. The Morro Grande area occurs in the central part of Iriri-Xingu domain, where a high-grade muscovite gneiss with a protolith of 2120-2180 Ma is dated at 1982 ± 7 Ma, and the leucosome of a migmatitic orthogneiss is crystallized at 1979 ± 8 Ma. These are the first records of high-grade metamorphism at ca. 1980 Ma in the Central Brazil shield and may be related to the generation of this Orosirian felsic magmatism, which is widespread throughout the nearby Ventuari-Tapajós province.

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Orosirian magmatic episodes in the erepecuru-trombetas domain (southeastern Guyana shield): Implications for the crustal evolution of the Amazonian craton

Cited by 16 publications

References 44 publications

A review of the geodynamic setting of the Volcanic Domain in the Juruena Magmatic Arc, southwestern Amazon Craton, Brazil, based on geochemical, U-Pb and Sm-Nd data

A review of the geodynamic setting of the Volcanic Domain in the Juruena Magmatic Arc, southwestern Amazon Craton, Brazil, based on geochemical, U-Pb and Sm-Nd data

https://jgsb.cprm.gov.br/index.php/journal/issue/view/24

U-Pb SHRIMP dating of basement rocks of the Iriri-Xingu domain, Central Amazonian province, Amazonian craton, Brazil

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