%0 Generic %A Bione, Fellippe Roberto Alves %A Bongiolo, Everton Marques %A Mendes, Julio Cezar %A Roland, Camila Leão %D 2019 %T Geochemistry, Sm-Nd isotopes and SHRIMP U-Pb geochronology of the Morro do Coco Granite (RJ, Brazil): another piece of the post-collisional magmatism of the Ribeira Belt %U https://scielo.figshare.com/articles/dataset/Geochemistry_Sm-Nd_isotopes_and_SHRIMP_U-Pb_geochronology_of_the_Morro_do_Coco_Granite_RJ_Brazil_another_piece_of_the_post-collisional_magmatism_of_the_Ribeira_Belt/9870419 %R 10.6084/m9.figshare.9870419.v1 %2 https://scielo.figshare.com/ndownloader/files/17698043 %2 https://scielo.figshare.com/ndownloader/files/17698046 %2 https://scielo.figshare.com/ndownloader/files/17698049 %2 https://scielo.figshare.com/ndownloader/files/17698052 %2 https://scielo.figshare.com/ndownloader/files/17698055 %2 https://scielo.figshare.com/ndownloader/files/17698058 %2 https://scielo.figshare.com/ndownloader/files/17698061 %2 https://scielo.figshare.com/ndownloader/files/17698064 %2 https://scielo.figshare.com/ndownloader/files/17698067 %2 https://scielo.figshare.com/ndownloader/files/17698070 %2 https://scielo.figshare.com/ndownloader/files/17698073 %2 https://scielo.figshare.com/ndownloader/files/17698076 %2 https://scielo.figshare.com/ndownloader/files/17698079 %2 https://scielo.figshare.com/ndownloader/files/17698082 %2 https://scielo.figshare.com/ndownloader/files/17698085 %2 https://scielo.figshare.com/ndownloader/files/17698088 %2 https://scielo.figshare.com/ndownloader/files/17698091 %2 https://scielo.figshare.com/ndownloader/files/17698094 %2 https://scielo.figshare.com/ndownloader/files/17698097 %K Post-collisional %K Brasiliano Orogeny %K Cambro-Ordovician %K Ribeira Belt %K Morro do Coco granite %X

Abstract The Morro do Coco granite (MC) is a post-collisional intrusive body that was emplaced at Ribeira Belt, in the Cambro-Ordovician, succeeding the final stages of the Gondwana supercontinent amalgamation. This unit requires more studies, contrasting with similar best investigated occurrences of the central Ribeira Belt. This work presents a detailed investigation of such unit using petrography, Inductively Coupled Plasma (ICP), X-Ray Fluorescence (XRF) whole-rock geochemistry, U-Pb (SHRIMP) geochronology and Sm-Nd isotopes. The rock is a nearly undeformed syenogranite, geochemically classified as a high-K calc-alkaline magnesian, with metaluminous to slightly peraluminous affinity. Strongly light rare earth elements (LREE)-enriched patterns with significant negative Eu anomalies, typical of post-collisional granites, are identified. Similarly to other post-collisional granites of the central Ribeira Belt, U-Pb zircon data provide crystallization age of 496 ± 3 Ma . Sm-Nd isotopic data suggest crustal magma source as indicated by εNd(496) of -9, 143Nd/144Nd ratios between 0.511747 and 0.511752 and Mesoproterozoic TDM ages of 1.3 Ga. Based on its geochemical characteristics, morphology and geochronology, this unit is considered here as a member of Nova Friburgo Suite. Geochronological data defined three pulses of magmatism in this part of the orogen during the Cambro-Ordovician (515, 490 and 460 Ma).

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