Temporal Evolution of Island Arc Magmatism and Its Influence on Long-Term Climate: Insights From the Izu Intra-Oceanic Arc

Continental arcs have an episodic magmatic activity over long-time periods, which is believed to modulate long-term climate. Island also the potential release large amount of CO 2 into atmosphere, but whether they display history throughout their lifespan that contributes (>10 Ma) climate changes remains open question. To set additional constraints on island arcs, here we examine fresh basalts and mineral-hosted melt inclusions from Izu intra-oceanic arc, shortly after eruption boninites (∼45 Ma ago). Using chemical markers, show mature arc has been relatively continuous its lifespan, except during opening Shikoku back-arc Basin (∼23–20 Ma). Because slab dehydration melting trigger decarbonation carbonate dissolution subducted plate, use slab-fluid markers (Ba/Th, Cs/Th, Cs/Ba, Rb/Th, Th/Nb) variations slab-derived captured by magmas. The steadiness in contribution suggests outgassed volcanism may remained homogeneous for past 40 Izu. If worldwide maintain a steady-state these volcanoes be rapidly balanced weathering tectonic erosion, draw down atmospheric (within 200–300 kyr). This rapid negative feedback volcanic degassing permits sustain viable millions years. lack co-variations between (δ 13 O, δ 18 C) averages fluids further implies might play minor role slide icehouse climatic conditions. stability be, instead, contributor maintaining broadly stable long timescales.