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

摘要: Abstract The postcollisional magmatism in the Ribeira Belt, a collisional Orogen developed through several episodes during convergence of Pan-African/Brasiliano Orogeny, was marked Eastern Terrane (Rio de Janeiro, SE Brazil) by intense granitic Cambro-Ordovician age. This previously divided into Surui and Nova Friburgo suites, both interpreted as I-type granites generated interactions magmas with crustal mantle origins. paper presents new contribution to understanding Sana Granite. It is based on analysis field work, mineralogical geochemical (elemental concentrations Inductively Coupled Plasma Emission Spectrometer, ICP-ES, Mass Spectrometry, ICP-MS) data, U–Pb dating Lu–Hf isotope analyses, Laser Ablation Spectrometry (LA-ICP-MS) from main body one satellite results this work show that Granite, grouped suite, petrographic, geochemical, isotopic characteristics do not match its initial petrogenetic interpretation. Data Granite composed alkali feldspar granites, syenogranites monzogranites. All these rocks are hololeucocratic leucocratic, small grains ranging fine coarse. They silica-supersaturated, peraluminous, mostly alkali-calcic plot at limit between ferrous magnesian fields. Crystallization ages 480 ± 6 million years (Ma) 495 ± 4 Ma obtained while 506 ± 10 Ma 508 ± 5 Ma. Hf data indicate sources, depleted model (TDM) varying 2.22 1.69 Ga eHf values −15.54 and − 6.54. set suggests an S-type granite formed partial melting metasedimentary dehydration hydrous minerals, such biotite muscovite. massif muscovite-bearing peraluminous granitoids (MPGs) associated high-pressure Orogens. Considering incompatible those it proposed use suite characterize stage Belt.