The orogenic evolution of the hot Araçuaí belt is characterized by continuous magmatic activity, with magmas of different compositions recording a long-lived (∼630 to ∼530 Ma) tectono-thermal evolution in response to convergence between the Congo and São Francisco continents during the West Gondwana amalgamation. Geochemical data from the Carlos Chagas domain (CCD) and the Nova Venécia Complex (NVC), in the hinterland of this belt, show that these rocks contain high amounts of heat producing elements – HPEs – (Th, U, and K) and have a dominant peraluminous signature, suggesting that they result from partial melting of continental crust. The CCD is intruded by post-collisional charnockites that have a dominant shoshonitic signature, interpreted as representing magmas from an enriched mantle reservoir with a variable amount of crustal contamination. Detailed morphological investigations at the macro- and micro-scales show that the CCD contains remnants of residuum material from metamorphic reactions associated with textures that attest to melt crystallization. This reinforces the interpretation that the CCD is locally derived, i.e., it represents an in-source subhorizontal rheologically weak layer of migmatites and parauthoctonous granites that formed during the orogenic thickening. The CCD likely triggered the formation of an orogenic plateau and a geological setting in which high temperature conditions could be sustained for tens of millions of years. In such a setting, continuous heat supply from radiogenic decay might have been the main heat source for the compositionally diverse magmatism during most of the orogenic evolution of the Araçuaí belt.

Araçuaí 热带的造山演化以持续的岩浆活动为特征，不同成分的岩浆记录了长寿命（~630 至~530 Ma）构造热演化，以响应刚果和圣弗朗西斯科大陆在西冈瓦纳河合并。来自该带腹地的 Carlos Chagas 域 (CCD) 和 Nova Venécia Complex (NVC) 的地球化学数据表明，这些岩石含有大量的产热元素——HPE——（Th、U 和 K），并且具有占主导地位的过铝特征，表明它们是大陆地壳部分熔化的结果。CCD 被碰撞后的charnockite 侵入，这些charnockite 具有占主导地位的shoshonitic 特征，被解释为代表来自具有可变地壳污染量的富集地幔储层的岩浆。宏观和微观尺度上的详细形态研究表明，CCD 包含来自变质反应的残余物质，与证明熔融结晶的纹理相关。这加强了 CCD 是局部衍生的解释，即它代表了在造山带增厚过程中形成的混合岩和准自然花岗岩的源内亚水平流变弱层。CCD 可能引发了造山带高原和地质环境的形成，在这种环境中，高温条件可以持续数千万年。在这种情况下，在阿拉瓜伊带的大部分造山运动演化过程中，来自放射性衰变的持续供热可能是成分多样的岩浆作用的主要热源。