Age and Origin of the Massangana Intrusive Suite and Associated Mineralizations, in the Rondônia Tin Province: Petrography, U-Pb, and Lu-Hf Isotopes Zircons

Rondônia intrusive suites represent the youngest A-type magmatism that occurred in SW of Amazon craton, with mineralizations Sn, Nb, Ta, W, and topaz. Petrological isotopic studies (U-Pb Lu-Hf by LA-ICP-MS) allowed Massangana granite to be subdivided into São Domingos facies (medium fine biotite-granite), Bom Jardim (fine granite), (pyterlites coarse granites) Taboca granites). The crystallization ages obtained were between 995.7 ± 9.5 Ma 1026 16 Ma, εHf values vary significantly positive negative, showing predominantly crustal sources for forming these rocks. Petrographic on ore samples indicate action co-magmatic hydrothermal fluids enriched CO2, H2O, F. These ores are characterized endogreisens, exogreisens, pegmatites, quartz veins explored area. endogreisens exogreisens formed topaz-granites zinnwaldite-granites; pegmatites topaz-zinnwaldite-cassiterite-granites; cassiterite-sulfides quartz. geometries mineralized bodies a dome-shaped contact host rocks magma chamber can attributed residual accumulation. In this sense, origin is related evolution granitic where terminal phases fluid-enriched lodged apical portions, present biotite-granite, albite-granite, (potassium series), or alkali-granite (sodic series) TDM concerning relation non-mineralized granite.