The Vitória Seamount (VTS), distant ~300 km from the Brazilian coastline at latitude 20°S, is the second closest offshore volcanic complex of the Vitória-Trindade Ridge (VTR) which corresponds to a ca. 1200 km long ridge of seamounts and islands composed of SiO₂-undersaturated magmatic rocks commonly considered to be the volcanic track of the Trindade mantle plume in the South American Plate. Based on the first sample dredged from Vitória Seamount, new petrographic and electron microprobe analyses from its rock show an alkaline basalt with pseudotrachytic texture consisting of bytownite and salite phenocrysts, labradorite microliths, anhedral titanomagnetite, and a yellowish green pseudomorphic phase composed of MgO–Al₂O₃–SiO₂–FeO. The fine-grained groundmass is mainly composed of strongly oriented lath-shaped labradorite microliths, opaque minerals, and vesicles filled by a yellowish green pseudomorphic phase. Whole-rock analyses of the Vitória Seamount rock reveal its SiO₂ undersaturation (SiO₂ ca. 40 wt.%; normative nepheline = 13.8), enrichment in Cr, Co, Ni, V and Sc, along with depletion in Zr, La and Nd contents compared to the other seamounts of the VTR. VTS show a strong enrichment in light-REE (La/Sm_N ca. 2.68) compared to heavy-REE (La/Yb_N = 20.79). Major and trace element evidence indicate that the melting of an enriched mantle source to generate the Vitória Seamount magma occurred dominantly in the garnet stability field. Trace element composition of VTS is consistent with ≤ 3% partial melting of the mantle source. Neodymium and Sr isotopic data suggest that the mantle source of the Vitória Seamount had been variably metasomatized by melts derived from enriched mantle component, which may have developed approximately 600 Ma, reconciling with the Brasiliano Orogeny, according to Nd age model. Modeling of the Nd–Sr isotope systematics points out that the primary melt was formed from an asthenospheric mantle (DMM – Depleted MORB [Mid-Ocean Ridge Basalts] Mantle) that underwent mixing with a continentally derived material (represented by EMI [Enriched Mantle I] component). This process can be explained by the mixing of melts from these mantle components during magma genesis.

维托里亚海山（VTS）是距巴西海岸线约20公里的300公里处，是维托里亚-特林达德山脊（VTR）的第二近海火山群，对应于约20世纪30年代。由SiO _2-欠饱和岩浆岩组成的海山和岛屿长1200公里，通常被认为是南美板块Trindade地幔柱的火山道。根据从维托里亚海山挖出的第一个样品，岩石中的新岩相学和电子微探针分析显示了碱性玄武岩，具有假三叠纪质构，包括bytownite和盐铁矿斑晶，拉长钙石微晶石，无面体钛磁铁矿，以及由MgO–Al组成的淡黄绿色假晶相₂ O _3-二氧化硅_{2 –} FeO。细粒地基主要由强取向的板条状拉长石微块，不透明矿物和由黄绿色假晶相填充的囊泡组成。对Vitória海山岩石的全岩分析显示出其SiO ₂欠饱和度（SiO ₂ 约为40 wt。％；标准霞石= 13.8），Cr，Co，Ni，V和Sc富集，以及Zr，La和Zr的耗竭。 Nd含量与VTR的其他海山相比。与重稀土（La / Yb _N）相比，VTS富含轻稀土（La / Sm _N 约2.68） = 20.79）。主要和微量元素证据表明，丰富的地幔源融化以产生维托里亚海山岩浆，主要发生在石榴石稳定区。VTS的痕量元素组成与地幔源部分熔化≤3％一致。根据钕年龄模型，钕和锶同位素数据表明，维托利亚海山的地幔来源已被富集的地幔成分衍生的熔体变质交代，该熔体可能已经发展了约600 Ma，与巴西拉西利亚造山运动相吻合。对Nd-Sr同位素的系统分析表明，初熔体是由软流圈地幔（DMM –贫化MORB [中海玄武岩玄武岩]地幔）与大陆衍生的物质（以EMI [Enriched Mantle I]代表）混合而成的。 ] 成分）。