ArticleProceedings of the National Academy of Sciences of the United States of America2023
Beyond spreading rate: Controls on the thermal regime of mid-ocean ridges.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 12 citations in OpenAlex.
- Melt burst events in a dominantly amagmatic lithosphere at Gakkel Ridge in the Arctic Ocean.Nature communications · 2026Article
- Magma convection favors ephemeral melt-rich bodies within mushy reservoirs.Nature communications · 2026Article
- Magnetotelluric evidence for highly focused mantle melting along the ultraslow-spreading Gakkel Ridge, Arctic Ocean.National science review · 2025Article
- Plume-scale confinement on thermal convection.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
- Beyond spreading rate: Controls on the thermal regime of mid-ocean ridges.Proceedings of the National Academy of Sciences of the United States of America · 2023Article
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
Abstract
The thermal state of mid-ocean ridges exerts a crucial modulation on seafloor spreading processes that shape ~2/3 of our planet's surface. Standard thermal models treat the ridge axis as a steady-state boundary layer between the hydrosphere and asthenosphere, whose thermal structure primarily reflects the local spreading rate. This framework explains the deepening of axial melt lenses (AMLs)-a proxy for the basaltic solidus isotherm-from ~1 to ~3 km from fast- to intermediate-spreading ridges but fails to account for shallow crustal AMLs documented at slow-ultraslow spreading ridges. Here, we show that these can be explained by a numerical model that decouples the potentially transient ridge magma supply from spreading rate, captures the essential physics of hydrothermal convection, and considers multiple modes of melt emplacement. Our simulations show that melt flux is a better thermal predictor than spreading rate. While multiple combinations of melt/dike emplacement modes, permeability structure, and temporal fluctuations of melt supply can explain shallow crustal AMLs at slow-ultraslow ridges, they all require elevated melt fluxes compared to most ridge sections of comparable spreading rates. This highlights the importance of along-axis melt focusing at slow-ultraslow ridges and sheds light on the natural variability of their thermal regimes.
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