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麦哲伦海山区MA、MC海山玄武岩基岩的岩石学特征研究表明，岩性为蚀变玄武岩、橄榄玄武岩等；结构为基质具间隐、间往结构及拉斑玄武结构的斑状结构；矿物组成为斜长石、橄榄石、辉石及脱玻化玻璃等。按岩石化学成分分类属碱性玄武岩，而稀土分配模式属洋岛碱性玄武岩类型。
The petrological characteristics of basalts from seamounts MA and MC in the Magellan seamounts indicate that the lithologies are altered basalts and olivine basalts, and the structures are macrophages with interlaminar structure, interlaminar structure and tholei basaltic structure. The mineral composition is Plagioclase, olivine, pyroxene and devitrified glass. According to petrochemical composition classification is alkaline basalt, and rare earth distribution model is Yangdao alkaline basalt type.