Figure F64. Downhole variations in selected major and trace elements (MgO, SiO₂, TiO₂, Nb, and Al₂O₃) and LOI for Site 1139 igneous rocks. Units 1-5 are rhyolite and trachyte, Units 6-17 are trachybasalt to basaltic trachyandesite, Unit 18 is a trachyandesite, and Unit 19 is a trachyte.