Geochemistry of late paleoproterozoic Anjana and Amet granites of the Aravalli craton with affinities to sanukitoid series granitoids: Implications for petrogenetic and geodynamic processes

Raza, Ausaf; Guha, D. B.; Neogi, Sudipta

doi:10.1016/j.chemer.2021.125758

Cited by 5 publications

(1 citation statement)

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“…In that context, these rocks have been interpreted as representing the transition from typical Archean geodynamics to Paleoproterozoic modern plate tectonics (Martin et al 2005, Heilimo et al 2010, Bruno et al 2020. Although most of the known sanukitoid suites were formed in the Neoarchean and Mesoarchean (e.g., Oliveira et al 2009, Martin et al 2010, Heilimo et al 2010, Laurent et al 2014, Sun et al 2020, Valeriano et al 2022, numerous works have characterized Proterozoic and Phanerozoic magmatic arc granitoid rocks with affinity with the sanukitoid series (e.g., Fowler and Rollinson 2012, Seixas et al 2013, Moreira et al 2018, Bruno et al 2020, 2021b, Raza et al 2021, Zhang et al 2021. Therefore, the investigation of sanukitoid rocks has direct implications for a better understanding of when and how stable and long-lived subduction settings.…”

Section: Introductionmentioning

confidence: 99%

Rhyacian magmatic arc rocks with sanukitoid geochemical signature from the Juiz de Fora Complex, Minas-Bahia Orogenic System (SE-Brazil)

Ferreira

Heilbron²,

Bruno³

et al. 2022

Braz. J. Geol.

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Sanukitoid rocks make up a complete magmatic series with distinct geochemical characteristics of TTG suites and granitoids from modern magmatic arcs and are regarded as markers of the transition from typically Archean geodynamics to modern plate tectonics. Although most known sanukitoid suites formed during the Neoarchean and Mesoarchean, numerous papers have characterized Paleoproterozoic magmatic arc granitoid rocks showing affinity with the sanukitoid series. This work presents new data from field, lithogeochemistry, zircon U-Pb geochronology, and Sm-Nd and Sr isotopic studies on granodioritic granulites with sanukitoid signatures from the Juiz de Fora Complex ( JFC), one of the Paleoproterozoic tectonic components of the Minas-Bahia Orogenic System (MBOS), southern São Francisco Paleocontinent (southeastern Brazil). These rocks crystallized at ~2175 Ma and present values of εNd t between −4.0 and +0.5, T DM between 2.57 and 2.12 Ga, and 87 Sr/ 86 Sr i between 0.6937 and 0.7137. We interpret these rocks as the result of crystallization of magmas from a hybrid mantle source extensively contaminated by crustal material during protracted subduction. In southeastern São Francisco Paleocontinent, the association of sanukitoid rocks with other magmatic arc rocks points to a complex and prolonged Rhyacian accretionary system similar to modern plate tectonics.

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