The study area is in the southern East Pernambuco–Alagoas Domain, Borborema Province, Southern sub-province, northeastern Brazil. The Maravilha Orthogneiss comprises an elongated intrusion of ~200 km², with an ESE-WNW major axis, ranging in composition from tonalite to sienogranite, emplaced into metasedimentary rocks of the Inhapi Sequence, in the southern part of the Pernambuco-Alagoas Domain. Diorite sheets, amphibolite, leucocratic dikes and quatz-feldspar pegmatite veins are common. The Maravilha Orthogneiss show SiO₂ contents ranging from 55.9 to 65.55 wt%, and Mg# (MgO/FeO + MgO) of 6.28–9.12. It has magnesian, metaluminous, and medium to high-K calc-alkaline composition. Chondrite-normalized spidergrams are characterized by troughs at Ba, Rb, Sr, Th, Nb and Ta. Chondrite-normalized REE patterns are moderately fractionated, with (Ce/Yb)_N ratios ranging from 2.28 to 17.29 and display discrete negative Eu anomalies. This rock shows volcanic-arc geochemical signature. U–Pb zircon SHRIMP data yielded an age of 646 ± 5 Ma, interpreted as the crystallization age of the protolith. The Geochemical and isotopic data suggest that the source of the Maravilha orthogneiss protolith involved mixing of crustal and mantle melts. The resulted magma evolved by amphibole, plagioclase and apatite fractionation. A sample of migmatitic orthogneisses of the Inhapi Sequence basement show U–Pb zircon crystallization age of 983 ± 7.2 Ma. The lack of zircon grains with Tonian age in the studied orthogneiss indicates no contribution of Tonian crust in their source. The Maravilha Orthogneiss is a record of a pre-to early-collisional calc-alkaline magmatism with arc-related geochemical signature emplaced during the beginning of the Brasiliano Orogeny compressive stage.

研究区位于巴西东北部南部次省博博雷马省东伯南布哥-阿拉戈斯地区南部。Maravilha Orthogneiss 包含一个约 200 km ²的细长侵入体，其长轴为 ESE-WNW，成分范围从 Tonalite 到 sienogranite，位于 Pernambuco-Alagoas 域南部的 Inhapi 层序的变质沉积岩中。闪长岩片、角闪岩、白斑岩脉和石英长石伟晶岩脉很常见。Maravilha Orthogneiss 显示 SiO ₂含量范围为 55.9 至 65.55 wt%，Mg#（MgO/FeO + MgO）为 6.28-9.12。它具有镁质、金属铝质和中至高 K 钙碱性成分。球粒陨石归一化蛛网图的特点是在 Ba、Rb、Sr、Th、Nb 和 Ta 处出现波谷。球粒陨石归一化 REE 模式中度分馏，具有 (Ce/Yb) _N比率范围从 2.28 到 17.29，并显示离散的负 Eu 异常。这块岩石显示出火山弧地球化学特征。U-Pb 锆石 SHRIMP 数据得出的年龄为 646 ± 5 Ma，解释为原岩的结晶年龄。地球化学和同位素数据表明，Maravilha 正方麻岩原岩的来源涉及地壳和地幔熔体的混合。所得岩浆经角闪石、斜长石和磷灰石分馏演化。Inhapi 层序基底的混合质正方麻岩样品显示 U-Pb 锆石结晶年龄为 983 ± 7.2 Ma。所研究的正方麻岩中缺少托尼安时代的锆石颗粒表明托尼安地壳在其来源中没有贡献。