Trachytic Melt Inclusions Hosted in Clinopyroxene Offer a Glimpse Into Samoan EM2‐Endmember Melts

Abstract We present major and trace element data on clinopyroxene‐hosted, glassy melt inclusions (MIs) from a highly enriched (high 87 Sr/ 86 Sr = 0.71856) lava (ALIA‐D115‐18) the Samoan hot spot. Following correction for post‐entrapment crystallization, MIs are trachytic (62.6–65.4 wt% SiO 2 , 1.5–3.0 MgO, 7.2–10.6 total alkalis (Na O + K O)) ALIA‐D115 lavas dredged off submarine flanks of Savai'i Island, western Samoa have previously been suggested to exhibit binary endmember magma mixing between mafic, low an evolved, high (the Enriched Mantle endmember; EM2). In space, these form trend more primitive shield this study, suggesting could represent EM2‐derived endmember. Recent efforts constrain EM2 composition shows remarkable overlap with MI compositions, supporting argument they derived Additionally, one inclusion contains Fo 73 olivines not in equilibrium melt, interacted mafic prior entrapment within host clinopyroxene. Projecting versus space that intersects average at values ∼0.725, thereby offering window into extreme compositions associated