The Gentio metagranitoid presents equigranular and porphyritic facies, modal composition ranging from tonalite to monzogranite with calculated T_Zr<800 °C for most samples. Its mineralogy is dominated by quartz and feldspar (77% to 95%), biotite is the only mafic mineral present (2% to 18%) and, titanite, zircon, apatite, allanite are important accessory phases. These rocks range from metaluminous to weakly peraluminous, and have large variation in major and trace elements, and high alkali contents (>6 wt.%). Zircon analyses by LA-ICP-MS and SHRIMP yielded a concordia age of 2 119±10 Ma for the porphyritic facies and an upper intercept age of 2 111±15 Ma for the equigranular facies. The whole-rock Sm-Nd T_DM ages vary from 2.4 to 2.8 Ga with ε_Nd(2.1) values between −0.7 and −5.3, indicating crustal derivation from distinct and/or heterogeneous protoliths. Field observations indicate that the Gentio metagranitoid was formed through different pulses of magma. Individual batches were subject to little or even no fractionation process after its emplacement. Although the Gentio metagranitoid crosscuts metamafic and metaultramafic rocks akin to an oceanic arc setting, this pluton is likely originated by partial melting of a more evolved quartz-feldspathic crustal igneous rock in a post-collisional environment, after the accretion of the arcs from the Mineiro belt and rocks of the Mantiqueira Complex.

Gentio 变花岗岩呈现等粒状和斑状相，模态组成范围从钠长岩到二长花岗岩，大多数样品的计算T _Zr <800 °C。其矿物学以石英和长石为主（77% 至 95%），黑云母是唯一存在的镁铁质矿物（2% 至 18%），而钛铁矿、锆石、磷灰石、褐铝石是重要的副相。这些岩石的范围从金属铝到弱过铝，主要和微量元素变化很大，碱含量高（> 6 wt.%）。LA-ICP-MS 和 SHRIMP 的锆石分析得出斑岩相的协和年龄为 2 119±10 Ma，等粒相的上截距年龄为 2 111±15 Ma。全岩 Sm-Nd T _DM年龄从 2.4 到 2.8 Ga 随ε_Nd (2.1) 值介于 -0.7 和 -5.3 之间，表明来自不同和/或异质原岩的地壳衍生。实地观察表明，Gentio 变花岗岩是通过不同的岩浆脉冲形成的。个别批次在其就位后很少或什至不进行分馏过程。尽管 Gentio 变花岗岩横切变镁铁质和变质镁铁质岩石，类似于大洋弧环境，但该岩体很可能起源于碰撞后环境中更进化的石英-长石质地壳火成岩的部分熔化，在 Mineiro 的弧增生之后Mantiqueira Complex 的带和岩石。