The ⁴⁰Ar/³⁹Ar ages (muscovite and biotite) and P-T estimations presented here allow us to reconstruct the Pressure–Temperature–time (P–T–t) path from the metamorphic peak to the generation of the orogenic Au (As, Bi, Ag) mineralization in the Buracão area. The application of software-based pseudosections for bulk phyllite composition allows us to better recognize three main stages in the P-T-t path. Rocks from the study area evolved from (i) syn-D_1a greenschist metamorphic peak (T = 480–550 °C and P < 4.0 kbar) attained at ca. 538–530 Ma during the W-E shortening related to local D₁ deformational stage, which is regionally reported in the external domain of the northern Brasilia Fold Belt. These younger ages, compared to those of mafic and felsic granulites from the northernmost internal domain west of the study area (ca. 610–570 Ma), indicate that the metamorphic peak in the external domain was attained after the internal domain. The (ii) syn-D_1b barren type I quartz vein formation (T = 510–260 °C and P < 4.0 kbar) at ca. 531–525 Ma; and (iii) syn-D_2a ore-bearing type II quartz vein formation and gold mineralization (T = 345–285 °C and P = 2.7–1.6 kbar) at ca. 522–515 Ma suggest that low temperature may represent cooling P-T conditions of the peripheral supracrustal cover. Moreover, the diachronicity between the local metamorphic peak and the gold mineralization (22 M.y.) is consistent with the structural relationship between gold veins and post-metamorphic peak D_2a high deformation zones, which may have acted as fluid corridors through the metasedimentary pile. These features are coherent with the time span observed in several orogenic gold deposits worldwide, especially those associated with high-angle transpressive shear zones developed in the late stages of orogeny. The combination of the Ar–Ar petrochronology with previous published fluid reconstruction and tectonic data suggests metal-rich fluid percolated along regional shear zones through the Traíras Formation under post-metamorphic peak conditions. This regional tectonic and chronology might be useful for geodynamical reconstruction and as a prospection guide in poorly studied orogenic gold of the area.

此处提供的⁴⁰ Ar/ ³⁹ Ar 年龄（白云母和黑云母）和 PT 估计使我们能够重建从变质峰到造山金（As，Bi , Ag) Buracão 地区的矿化。基于软件的假截面对块状千枚岩成分的应用使我们能够更好地识别 PTt 路径中的三个主要阶段。来自研究区的岩石是从（i）syn-D _1a绿片岩变质峰（T = 480-550 °C 和 P < 4.0 kbar）演化而来的。与局部 D ₁相关的 WE 缩短期间的 538-530 Ma变形阶段，在巴西利亚褶皱带北部的外部区域进行了区域性报告。与研究区最北端内域（约 610-570 Ma）的镁铁质和长英质麻粒岩相比，这些较年轻的年龄表明外域的变质峰是在内部域之后达到的。（ii）syn-D _1b贫瘠 I 型石英脉形成（T = 510–260 °C 和 P < 4.0 kbar）在大约。531–525 毫安；(iii) 合成-D _2a含矿石 II 型石英脉形成和金矿化（T = 345–285 °C 和 P = 2.7–1.6 kbar）在大约 522-515 Ma 表明低温可能代表外围上壳盖层的冷却 PT 条件。此外，局部变质峰与金矿化（22 My）的历时性与金脉与后变质峰D _2a的结构关系一致高变形区，可能充当了穿过变质沉积桩的流体通道。这些特征与在全球几个造山带金矿床中观察到的时间跨度一致，特别是与造山运动后期形成的高角度压切剪切带相关的那些。Ar-Ar 岩石年代学与先前公布的流体重建和构造数据相结合，表明富金属流体在变质后峰值条件下沿着区域剪切带渗透通过 Traíras 地层。这种区域构造和年代学可能对地球动力学重建有用，并可作为对该地区研究不足的造山金矿的勘探指南。