Sana Granite, a post-collisional S-type magmatic suite of the Ribeira Belt (Rio de Janeiro, SE Brazil)

Potratz, Guilherme Loriato; Geraldes, Mauro César; Martins, Maria Virgínia Alves; Almeida, Bruna Saar de

doi:10.1016/j.lithos.2021.106077

Cited by 4 publications

(3 citation statements)

References 44 publications

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“…Afonso Cláudio Intrusive Complex (ACIC) presents εHf values in zircon grains ranging from −11.78 to 10.41 (Figure 13) and model ages for the depleted mantle ranging from 1.79 to 1.72 Ga [39]. For the Sana granite, εHf values in zircon grains ranged from −15.54 to −6.54 (Figure 13), and model ages (TDM) ranged from 2.22 to 1.69 Ga [13]. The Mestre Álvaro and Vitória plutons presented εHf values in zircon grains varying from −10.30 to −7.40 and from −8.80 to −0.70, respectively (Figure 13) [41].…”

Section: Discussionmentioning

confidence: 99%

“…The post-collisional magmatism that develops in the Ribeira orogen is essentially granitic, with restricted cases of intermediate and basic rocks [11,12]. In the Ribeira orogen, the post-collision bodies are grouped into I-type granites, represented by the Suruí and Nova Friburgo suites, and S-type granites, represented by the Sana suite [11][12][13]. In the Araçuaí orogen, the magmatism associated with the collapse of the orogen presents greater complexity, subdivided into the G4 and G5 super suits [5].…”

Section: Introductionmentioning

confidence: 99%

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A Juvenile Component in the Pre- and Post-Collisional Magmatism in the Transition Zone between the Araçuaí and Ribeira Orogens (SE Brazil)

et al. 2022

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The Araçuaí and Ribeira orogens have been studied for decades, and recently, these two orogens were described as the Araçuaí–Ribeira Orogen System. Despite much work investigating this orogenic system, some issues, such as the connection between the two orogens, are still not fully understood. This work aimed to present unpublished Lu-Hf data for the Santa Angélica Intrusive Complex (SAIC) and for the host rocks that are part of the Rio Negro magmatic arc, as well as to present U-Pb ages for these rocks, thus contributing to the understanding of the geological processes that acted in the transition zone between the Araçuaí and Ribeira orogens. Two samples were collected corresponding to the magmatic arc and six samples from the Santa Angélica Intrusive Complex. The zircon grains were separated from the samples and subjected to geochronological (U-Pb) and isotopic (Lu-Hf) analysis by laser ablation-induced coupled plasma mass spectrometry (LA-ICP-MS). The geochronological data for the host rocks indicate a crystallization age of ca. 595 Ma. In contrast, the Hf isotopic data point to at least two magmatic sources, one crust, and one mantle. The geochronological data obtained for the SAIC rocks show three age peaks. The first peak (537 ± 5 Ma) coincides with the process of crustal anatexis and possibly marks the beginning of the generation of magmas associated with post-collisional magmatism. The second peak (510 ± 5 Ma) registers the apex of crystallization of the SAIC, and the third peak of ages (488 ± 7 Ma) marks the upper limit of the magmatism in the SAIC. The SAIC isotopic data point to at least two crustal components and a mantle component (juvenile).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Juvenile Component in the Pre- and Post-Collisional Magmatism in the Transition Zone between the Araçuaí and Ribeira Orogens (SE Brazil)

et al. 2022

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“…Furthermore, research shows that the intense extension and deformation led to the crust thickness being increased by 50 km [60]. Additionally, the crust thickening caused crust extension and decompression melting, forming granite magma [63,64]. Many earlymiddle-Triassic syncollisional granites and late-Triassic post-collisional granites were generated in this area [65].…”

Section: Age Of the Baishi W-cu Deposit And Geodynamic Settingmentioning

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Geochronology of the Baishi W-Cu Deposit in Jiangxi Province and Its Geological Significance

Wang

et al. 2022

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The Baishi W-Cu deposit is located in the Nanling metallogenic belt, which is famous for its numerous W deposits and reserves. The formation age of this deposit remains unclear. In order to further infer the formation age of the deposit, this study conducted detailed LA-ICP-MS U-Pb isotopic analyses of zircon and monazite selected from ore-related Baishi granite. The LA-ICP-MS zircon U-Pb weighted average ages of Baishi granite were determined to be 223 ± 2 Ma and 226 ± 1 Ma, and the LA-ICP-MS U-Pb weighted average ages of monazite were determined to be 224 ± 2 Ma and 223 ± 1 Ma. The BSE image of monazite was homogeneous, and the pattern of rare earth elements had an obvious negative Eu anomaly, indicating that monazite was of magmatic origin. Combining the ages of zircon and monazite, this study inferred that Baishi granite and the Baishi W-Cu deposit formed in the Triassic. The determination of the ore-forming event of the Baishi W-Cu deposit provides new data regarding the important Indosinian (Triassic) mineralization events in the Nanling metallogenic belt and suggests that geologists should strengthen the prospecting work of Indosinian tungsten deposits in the Nanling area. In terms of tectonic setting, it was inferred that the Triassic Baishi W-Cu deposit was formed in the extensional environment after intracontinental orogeny.

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Zircon U Pb geochronology and Lu Hf isotope geochemistry constraints on Neoproterozoic S-type meta-granites from the Tutak area, Sanandaj-Sirjan Zone, Iran

Bendokht

Davoudian

Shabanian

et al. 2023

Lithos

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Sana Granite, a post-collisional S-type magmatic suite of the Ribeira Belt (Rio de Janeiro, SE Brazil)

Cited by 4 publications

References 44 publications

A Juvenile Component in the Pre- and Post-Collisional Magmatism in the Transition Zone between the Araçuaí and Ribeira Orogens (SE Brazil)

A Juvenile Component in the Pre- and Post-Collisional Magmatism in the Transition Zone between the Araçuaí and Ribeira Orogens (SE Brazil)

Geochronology of the Baishi W-Cu Deposit in Jiangxi Province and Its Geological Significance

Zircon U Pb geochronology and Lu Hf isotope geochemistry constraints on Neoproterozoic S-type meta-granites from the Tutak area, Sanandaj-Sirjan Zone, Iran

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