The Lagoa Real Complex, in the Lagoa Real Uranium Province, is a manifestation of extensive intraplate A-type magmatism that occurred in the São Francisco Craton during the Paleoproterozoic. U–Pb dating of zircon by LA-MC-ICP-MS shows that granites were emplaced during a Statherian, rift-related, 1.76–1.72 Ga magmatic episode, coeval with emplacement of the A-type Borrachudos suite and felsic metavolcanic rocks from the southeastern, central and northern Espinhaço Igneous Province of the São Francisco Craton. The Lagoa Real Complex involves at least three co-genetic pulses, starting with the initial emplacement of the alkali-feldspar-bearing Lagoa do Barro granite, which crystallized at 1762 ± 9 Ma. This was followed by emplacement of the Juazeirinho granite at 1755 ± 6 Ma, and finally the intrusion of the São Timóteo granite, which represents the main magmatic peak of the Lagoa Real Uranium Province, at 1741 ± 4 Ma. Although the São Timóteo granite has some characteristics that suggest it may be a rapakivi granite, there is no classical cogenetic association with basic rocks. This study confirms that the charnockites of the Lagoa Real Complex have an age of 2047 ± 5 Ma. They are therefore not part of the evolution of the 1.76–1.74 Ga magmatic episode. Also, rocks within the Lagoa Real Uranium Province that were previously mapped as leucodiorites are, in fact, albite-gneiss with ages of 1743–1740 Ma, which originated through the gneissification processes that affected the São Timóteo granite and can also be classified as albitites. The highly negative values of ϵNd₍₀₎ from −27 to −33 and high initial Sr ratio are compatible with the Lu–Hf isotopic data of previous studies. These results suggest the Lagoa Real Complex has a crustal derivation with minimum mantle involvement. The formation of the Lagoa Real Complex granites is inferred to be a result of fractional crystallization. All studied granites have a similar geochemical signature in terms of trace elements including REEs, which indicates that the granites come from the same magmatic source and are related to rifting and the initial stages of the Espinhaço Supergroup evolution. The source of the Lagoa Real Complex would be reworked Archean crustal material, probably in the mid to deep crust. Finally, the studied granites, although predominantly metaluminous, have U contents (maximum 12 ppm) below the world average for A-type granites (20 ppm). The fractionation values of Th in relation to U, and the absence of metamictization of the minerals (mostly allanite) that potentially host uranium confirms this observation. Therefore, the granites of the Lagoa Real Complex, despite being the protolith of bodies that host U mineralization, should not be considered as the principal source of U in the U mineralization found in the Lagoa Real albitites. However, the provenance of an important part of the uranium could be associated with Statherian meta-rhyolites and meta-rhyodacites, contemporaneous with the São Timóteo granite, and occurring to the west of the Lagoa Real Complex.

拉各亚雷亚尔铀矿省的拉各亚雷亚尔复杂岩体是古元古代发生在圣弗朗西斯科克拉通的板块内广泛的A型岩浆作用的表现。通过LA-MC-ICP-MS对锆石进行U–Pb测年表明，花岗岩是在与史达特裂谷有关的1.76–1.72 Ga岩浆事件期间发生的，与A型Borrachudos套件和长石质的远火山岩的发生同时发生东南，中部和北部的圣弗朗西斯科·克拉顿埃斯皮尼亚科火成岩省。Lagoa Real Complex涉及至少三个共生脉冲，始于含碱长石的Lagoa do Barro花岗岩的初始位置，该花岗岩在1762±9 Ma处结晶。接下来是Juazeirinho花岗岩在1755±6 Ma的位置，最后是圣蒂莫特（SãoTimóteo）花岗岩的侵入，代表拉各斯雷亚尔铀矿省的主要岩浆峰，位于1741±4 Ma。尽管圣蒂莫特花岗岩具有一些特征，表明它可能是拉帕基维花岗岩，但与基本岩石之间没有经典的同生关联。这项研究证实，拉各斯皇家情结的夏洛克人的年龄为2047±5 Ma。因此，它们不属于1.76–1.74 Ga岩浆事件演化的一部分。此外，实际上被映射为亚闪闪岩的拉各斯真实铀矿省内的岩石实际上是年龄为1743–1740 Ma的钠长石-片麻岩，其起源于影响圣蒂莫特花岗岩的片麻岩化过程，也可以归类为方铁矿。 。ϵNd的高度负值 尽管圣蒂莫特花岗岩具有一些特征，表明它可能是rapakivi花岗岩，但与基本岩石之间没有经典的同基因关联。这项研究证实，拉各斯皇家情结的夏洛克人的年龄为2047±5 Ma。因此，它们不属于1.76–1.74 Ga岩浆事件演化的一部分。此外，实际上被映射为亚闪闪岩的拉各斯真实铀矿省内的岩石实际上是年龄为1743–1740 Ma的钠长石-片麻岩，其起源于影响圣蒂莫特花岗岩的片麻岩化过程，也可以归类为方铁矿。 。ϵNd的高度负值 尽管圣蒂莫特花岗岩具有一些特征，表明它可能是rapakivi花岗岩，但与基本岩石之间没有经典的同基因关联。这项研究证实，拉各斯皇家情结的夏洛克人的年龄为2047±5 Ma。因此，它们不属于1.76–1.74 Ga岩浆事件演化的一部分。此外，实际上被映射为亚闪闪岩的拉各斯真实铀矿省内的岩石实际上是年龄为1743–1740 Ma的钠长石-片麻岩，其起源于影响圣蒂莫特花岗岩的片麻岩化过程，也可以归类为方铁矿。 。ϵNd的高度负值 这项研究证实，拉各斯皇家情结的夏洛克人的年龄为2047±5 Ma。因此，它们不属于1.76–1.74 Ga岩浆事件演化的一部分。此外，实际上被映射为亚闪闪岩的拉各斯真实铀矿省内的岩石实际上是年龄为1743–1740 Ma的钠长石-片麻岩，其起源于影响圣蒂莫特花岗岩的片麻岩化过程，也可以归类为方铁矿。 。ϵNd的高度负值 这项研究证实，拉各斯皇家情结的夏洛克人的年龄为2047±5 Ma。因此，它们不属于1.76–1.74 Ga岩浆事件演化的一部分。此外，实际上被映射为亚闪闪岩的拉各斯真实铀矿省内的岩石实际上是年龄为1743–1740 Ma的钠长石-片麻岩，其起源于影响圣蒂莫特花岗岩的片麻岩化过程，也可以归类为方铁矿。 。ϵNd的高度负值 其起源于影响圣蒂莫特花岗岩的片麻岩化过程，也可归类为方铁矿。ϵNd的高度负值 其起源于影响圣蒂莫特花岗岩的片麻岩化过程，也可归类为方铁矿。ϵNd的高度负值_（0）从-27至-33且高的初始Sr比与先前研究的Lu–Hf同位素数据兼容。这些结果表明，Lagoa Real Complex具有最小的地幔参与的地壳导数。推断Lagoa Real Complex花岗岩的形成是分步结晶的结果。所有研究的花岗岩在微量元素（包括稀土元素）方面都具有相似的地球化学特征，这表明这些花岗岩来自相同的岩浆来源，并且与裂谷作用和Espinhaço超群演化的初始阶段有关。Lagoa Real Complex的来源可能是重造的太古宙地壳材料，可能在中壳至深壳中。最后，研究的花岗岩虽然主要为金属，但其U含量（最大12 ppm）低于A型花岗岩的世界平均水平（20 ppm）。Th相对于U的分馏值以及可能存在铀的矿物（主要是软锰矿）的不成矿作用证实了这一观点。因此，尽管拉古亚真实复合体的花岗岩是承载U矿化的主体的原生石，但不应将其视为拉各亚真实方铁矿中U矿化的U的主要来源。但是，铀的重要部分可能与Statherian变质流纹岩和变质流纹岩有关，与SãoTimóteo花岗岩同时存在，并发生在Lagoa Real Complex的西部。尽管是承载U矿化的物体的原石，但不应将其视为拉各亚雷亚尔真正的铀矿中U矿化中U的主要来源。但是，铀的重要部分可能与Statherian变质流纹岩和变质流纹岩有关，与SãoTimóteo花岗岩同时存在，并发生在Lagoa Real Complex的西部。尽管是承载U矿化的物体的原石，但不应将其视为拉各亚雷亚尔真正的铀矿中U矿化中U的主要来源。但是，铀的重要来源可能与Statherian变质流纹岩和变质流纹岩有关，与SãoTimóteo花岗岩同时存在，并发生在Lagoa Real Complex的西部。