The study of the petrology of the basalt basements in two seamounts MA and MC of the Magellan seamounts indicate:(1)Basalt basements in seamounts MA and MC are altered basalt and dorgalite etc.

• 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。