Tungsten mineralization in the Bodó mineral district (9 Mt with an average grade of 2% WO₃) is in a sequence of metasomatized marbles and W-(Mo)-skarn lenses in the Seridó Belt, northern Borborema Province. The marble lenses have variable amounts of diopside, grossular, scapolite, phlogopite, and tremolite. The skarn lenses are mainly composed of massive grossular, diopside, vesuvianite, epidote, and quartz. A spatially related granite yielded a SHRIMP U‒Pb zircon date of 536.6 ± 3.4 Ma and a ⁴⁰Ar/³⁹Ar biotite date of 490.65 ± 0.67 Ma, whereas a nearby pegmatite yielded a ⁴⁰Ar/³⁹Ar muscovite date of 501.63 ± 0.59 Ma. Literature data for molybdenite in the skarn mineralization yielded a Re‒Os date of 510 ± 2 Ma, which is coeval with U‒Pb dates of columbite-tantalite from other regional pegmatites (515–509 Ma). Therefore, it is likely that pegmatite magmatism acted as the source of fluid and heat for the mineralization. The C–O stable isotope data for marbles and skarns are consistent with interaction of magmatic fluid and host marble at variable XCO₂ conditions. T-XCO₂ pseudosections define peak conditions of metamorphism/metasomatism at 650–600 °C over a wide range of XCO₂ (between 0.4 and 0.8), whereas the retrograde stage started at ~ 550 °C. Late garnet crystallization at low XCO₂ (< 0.2) indicates high H₂O influx, while scapolite crystallization required high XCO₂ (~ 0.8). Together with the interpretation of textural relationships, these observations indicate that skarn and marble formation occurred under open-system conditions with fluctuating XCO₂ fluid composition as a consequence of magmatic fluid infiltration.

博多矿区的钨矿化（9 山，平均品位为 2% WO ₃ ）位于博博雷马省北部塞里多带的一系列交代大理石和 W-(Mo)-矽卡岩透镜体中。大理石透镜含有不同数量的透辉石、钙铝榴石、方柱石、金云母和透闪石。夕卡岩透镜体主要由块状钙铝榴石、透辉石、伏苏云石、绿帘石和石英组成。空间相关的花岗岩得出的 SHRIMP U-Pb 锆石定年值为 536.6 ± 3.4 Ma， ⁴⁰ Ar/ ³⁹ Ar 黑云母定年为 490.65 ± 0.67 Ma，而附近的伟晶岩则得出了 ⁴⁰ Ar/ ³⁹ Ar 白云母日期为 501.63 ± 0.59 Ma。夕卡岩矿化中辉钼矿的文献数据得出的 Re-Os 年龄为 510 ± 2 Ma，与其他区域伟晶岩的铌铁矿-钽铁矿的 U-Pb 年龄 (515-509 Ma) 同期。因此，伟晶岩岩浆作用很可能是成矿的流体和热源。大理岩和夕卡岩的 C-O 稳定同位素数据与可变 XCO ₂ 条件下岩浆流体和大理岩的相互作用一致。 T-XCO ₂ 伪剖面定义了在 650–600 °C 范围内 XCO ₂ （0.4 和 0.8 之间）的变质/交代峰值条件，而逆行阶段开始于〜550°C。低 XCO ₂ (< 0.2) 下的晚期石榴石结晶表明高 H ₂ O 流入，而方沸石结晶需要高 XCO ₂ (~ 0.8)。结合结构关系的解释，这些观察结果表明，夕卡岩和大理石的形成发生在开放系统条件下，由于岩浆流体渗透，XCO ₂ 流体成分发生波动。