大洋拉斑玄武岩（oceanic tholeiite）又称深海拉斑玄武岩，是产生在海岭、海山等处的富含铝、钠，而贫钛、钾的拉斑玄武岩。太平洋、大西洋和印度洋中脊一般都由大洋拉斑玄武岩构成，故又称洋脊型拉斑玄武岩。
地球化学研究表明，其为典型的大洋拉斑玄武岩（MORB型玄武岩）。
The study of geochemistry indicates that these metabasic volcanic rocks are characterized with N-type MORB (mid-ocean ridge basalt).
较合理地解释了结合带内，大洋拉斑玄武岩、洋岛玄武岩、大陆碱性玄武岩共存的地质特征。
Association of continental alkaline basalt with oceanic tholeiite and oceanic island basalt in the junction is reasonably interpreted.
结果表明，该区的斜长角闪岩是由大洋拉斑玄武岩变质而成，变粒岩则是由酸性沉积岩变质而成。
It was shown that the amphibolite was transformed from oceanic tholeiitic basalts and the leptynite was converted from acidic sedimentary rocks.
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