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Alkaline volcanic rocks dredged from the upper and central flanks of Tropic Seamount, central Atlantic Ocean, encompass a compositional spectrum ranging from basalt and trachybasalt (hawaiite, mugearite) to trachyte. Plagioclase and olivine form phenocrysts in partially vesicular basalt. Feldspar laths are occasionally Carlsbad and/or albite twinned with faint oscillatory zoning; compositions vary...
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