Magma Storage at Ocean Islands

The Cape Verde archipelago is a group of ocean islands in the Central Atlantic that forms two chains trending northwest and southwest. Several are considered to be volcanically active, with frequent eruptions on Fogo. We examine mineral chemistry thermobarometry southern islands—Santiago, Fogo, Brava—together Cadamosto Seamount. Our objective explore magmatic storage system implications for volcanic associated hazards at Verde. rocks alkaline dominantly mafic, whereas island Brava Seamount unusually felsic. Clinopyroxene compositions range from 60 90 Mg# Santiago In contrast, Seamount, clinopyroxene 5 75 Mg#. Mineral zonation records fractional crystallization, recharge, aggregation crystals, magma mixing, variations thermal conditions temperatures 925 1250 °C. Magma depths Santiago, Brava, between 12 40 km, forming deep sub-Moho zones. Transient crust suggested by fluid inclusion re-equilibration pre-eruption seismicity. A global compilation suggests common feature, often rapid ascent through crust. Shallow more variable likely reflects local crustal structure, sediment supply, tectonics. Petrological constraints plumbing elsewhere vital integrate deformation models seismicity order improve understanding mitigation hazards.