The post-collisional period of the Brasiliano/Pan-African Orogenic Cycle along the Dom Feliciano Belt in southern Brazil (650–580 Ma) is marked by intense magmatism, comprised of substantial volumes of coeval granitic and mafic rocks emplaced along transcurrent shear zones that constitute the Southern Brazilian Shear Belt. Some representatives of this magmatism are the Estaleiro Granodiorite (EG) and associated fine-grained granites that compose the Estaleiro Granitic Complex (EGC), together with minor volumes of mafic material as enclaves and tabular bodies. The EGC is a syntectonic rock association that registers the main transcurrent phase of the Major Gercino Shear Zone (MGSZ). The Estaleiro Granodiorite and fine-grained granites share the same MGSZ dextral transcurrent kinematics and evolution from magmatic to solid-state conditions under deformational temperatures consistent with upper-greenschist to mid-amphibolite facies. New zircon UPb LA-MC-ICP-MS crystallisation ages, 612 ± 3.5 and 611 ± 5.3 Ma, for the Estaleiro Granodiorite undeformed and deformed portions constrain the timing of transcurrent tectonic activity of the Major Gercino Shear Zone. Geochemical features as SiO₂ contents above 63%, the alkaline and potassic predominant character [K₂O > (Na₂O – 2)], enrichment in Na₂O + K₂O (6.9–9.2 wt%), high K₂O/Na₂O ratios (0.8–1.4), high Al₂O₃ (14.1–16.4 wt%), low TiO₂ (0.1–0.8 wt%) and high Fe₂O₃/FeO (~1.11), Ba (488–1701 ppm),Sr (260–1006 ppm), strong enrichment in LILE relative to HFSE, REE with moderate fractionation [(La/Yb)_N = 10.6–51.1] and absence of strong Eu negative anomalies [(Eu/Eu*)_N = 0.54–1.23] of the Estaleiro Granitic Complex granitoids are compatible with rocks of shoshonitic affinity. New ⁸⁷Sr/⁸⁶Sr_i ratios and ƐNd_t values obtained for fine-grained granites point to increasing crustal contamination along the differentiation of the complex. Whole-rock chemical and SrNd isotope data point to mantle sources modified by previous, subduction-related metasomatism. The primary magmas have evolved through AFC processes, more prominent in the most differentiated and/or deformed rocks. We suggest that the transcurrent tectonism of the Major Gercino Shear Zone played an important role in the activation of mantle sources capable of originating shoshonitic magmas and facilitated their interaction with crustal melts to generate the Estaleiro Granitic Complex granitoids.

沿巴西南部 Dom Feliciano 带（650-580 Ma）的巴西利亚诺/泛非造山旋回碰撞后时期的特点是强烈的岩浆活动，包括大量沿横流剪切带侵位的同时期花岗岩和镁铁质岩石构成巴西南部剪切带。这种岩浆作用的一些代表是 Estaleiro 花岗闪长岩 (EG) 和构成 Estaleiro 花岗岩复合体 (EGC) 的相关细粒花岗岩，以及少量的镁铁质材料作为飞地和板状体。EGC 是一个同构造岩协会，记录了主要 Gercino 剪切带 (MGSZ) 的主要横流相。Estaleiro 花岗闪长岩和细粒花岗岩具有相同的 MGSZ 右旋横流运动学和在变形温度下从岩浆到固态条件的演化，与上绿片岩到中角闪岩相一致。新锆石UEstaleiro 花岗闪长岩未变形和变形部分的 Pb LA-MC-ICP-MS 结晶年龄分别为 612 ± 3.5 和 611 ± 5.3 Ma，限制了主要 Gercino 剪切带的横流构造活动的时间。地球化学特征为 SiO ₂含量高于 63%，以碱性和钾质为主 [K ₂ O > (Na ₂ O – 2)]，富含 Na ₂ O + K ₂ O (6.9-9.2 wt%)，高 K ₂ O/Na ₂ O 比 (0.8–1.4)、高 Al ₂ O ₃ (14.1–16.4 wt%)、低 TiO ₂ (0.1–0.8 wt%) 和高 Fe ₂ O ₃/FeO (~1.11), Ba (488–1701 ppm), Sr (260–1006 ppm), LILE 相对于 HFSE 富集强, REE 具有中等分馏 [(La/Yb) _N  = 10.6–51.1] 并且不存在 Estaleiro 花岗岩复合体花岗岩的强 Eu 负异常 [(Eu/Eu*) _N = 0.54–1.23] 与具有钾长石亲和性的岩石相容。细粒花岗岩的新⁸⁷ Sr/ ⁸⁶ Sr _i比值和 ƐNd _t值表明，随着复合体的分化，地壳污染增加。全石化学和锶Nd 同位素数据指向由先前的俯冲相关交代作用修改的地幔源。原生岩浆通过 AFC 过程演化，在最分化和/或变形的岩石中更为突出。我们认为，主要 Gercino 剪切带的横流构造作用在地幔源的激活中发挥了重要作用，这些地幔源能够起源于玄武岩岩浆并促进它们与地壳熔体的相互作用以产生 Estaleiro 花岗岩杂岩花岗岩。