The northern region of the intracontinental sector of the Araçuaí Orogen preserves geological records related to overlapping basins and tectonic reactivations between the Mesoarchean to the Cryogenian. The representatives are the metavolcanosedimentary sequences (i) Leandrinho (LMVS), here defined, that intercalates aluminous schists (metapelite), metagreywackes, acid metatuffs, and metalapillites, with a crystallization age of 2550 ± 2 Ma and; (ii) Rio São João (RSJMVS), with metagreywackes and metarkoses, metapelites, metarhytmites, itabirites, hematite-schists, and schistified mafic-ultramafic metavolcanics, presenting maximum depositional ages of 2280 ± 46 and 1971 ± 50 Ma for the Ibiassucê and Água Branca units, respectively. The metavolcanics of the LMVS are mainly subalkaline, sodic, magnesian, metaluminous to peraluminous, and of continental arc setting, with chemistry similar to TTG correlates. One sample has a chemical composition similar to that of sanukitoids. The model age (T_DM) varies between 3003 and 3074 Ma and Ɛ_Nd between −5,06 and −5,84. In the SMRSJ, schistified metamafics, metagreywackes and metarkoses, and metapelites present chemical signature and geological context associated with a continental arc setting. These siliciclastic rocks have a model age (T_DM) between 2618 and 3069 Ma, with Ɛ_Nd between −2,70 and −9,21. The entire sequence of the Araçuaí-West Congo intracontinental sector was deformed and metamorphosed during the Ediacaran, generating a prominent gneissic banding that embeds the sequences. The main point of the paper is the description of the previously unrecognized Leandrinho metavolcanosedimentary sequence (LMVS). Subordinately, to demonstrate the superposition of two basin-forming events, at the end of the Neoarchaean and during the Rhycian/Orosirian.

Araçuaí 造山带大陆内部分的北部地区保留了与重叠盆地和中太古代到低温纪之间的构造活动有关的地质记录。代表的是变质火山沉积序列 (i) Leandrinho (LMVS)，在这里定义，夹铝片岩(metapelite)、metagreywackes、酸性metatuffs 和metalapillites，结晶年龄为2550 ± 2 Ma 和；(ii) Rio São João (RSJMVS)，具有变灰岩和变灰岩、变泥岩、变水岩、铁笔岩、赤铁片岩和片状镁铁质-超铁镁质变火山岩，Ibiassucê 和 Água 的最大沉积年龄分别为 2280 ± 46 和 1971 ± 50 Ma布兰卡单位，分别。LMVS 的变质火山主要是亚碱性、钠质、镁质、金属铝质至过铝质，以及大陆弧设置，化学性质与 TTG 相关。一个样品的化学成分与 sanukitoids 相似。模型年龄 (T _DM ) 在 3003 和 3074 Ma 和Ɛ _{Nd之间变化}在 -5,06 和 -5,84 之间。在 SMRSJ 中，片岩变质岩、变灰岩和变质岩以及变泥质岩呈现出与大陆弧环境相关的化学特征和地质背景。这些硅质碎屑岩的模型年龄 (T _DM ) 介于 261​​8 和 3069 Ma 之间，Ɛ _Nd介于 -2,70 和 -9,21 之间。在埃迪卡拉纪期间，阿拉苏伊-西刚果大陆段的整个层序发生了变形和变质，产生了嵌入层序的显着片麻岩条带。论文的重点是对以前未被认识的莱安德里尼奥变火山沉积层序（LMVS）的描述。其次，展示两个盆地形成事件的叠加，在新太古代末期和 Rhycian/Orosirian 期间。