Mantle Melting Dynamics and Basalt Generation

The generation of basaltic magmas at mid-ocean ridges, ocean islands and convergent margins is governed by the dynamics of mantle melting. As mantle material rises or is fluxed by volatiles, it crosses its solidus and begins to produce interstitial melts. The interplay between temperature, pressure, composition and fluid input controls the extent of partial melting, the composition of primary magmas and the efficiency of melt extraction. Heterogeneities in the mantle—whether inherited from recycled crustal fragments or generated by melt-rock reactions—imprint distinctive major- and trace-element signatures on basaltic lavas. Advances in experimental petrology, in situ mineral chemistry and numerical modelling have refined our understanding of how lithological domains such as peridotite and pyroxenite contribute to melt generation, how kinetic processes can modify trace-element distributions within minerals, and how melt percolation and reactive crystallisation shape the physical and chemical architecture of the upper mantle. Together, these insights are reshaping our view of basalt petrogenesis from ridge axes to subduction zones and highlighting the global importance of mantle heterogeneity for crustal growth, volcanic hazards and geochemical cycles.

Research from Nature Portfolio

Recent studies have demonstrated that kinetic fractionation during melt transport can produce europium anomalies in clinopyroxene without requiring the presence of recycled plagioclase-rich crust. Detailed micro-analysis of natural mantle peridotites reveals crystal-scale chemical zoning, while diffusion modelling confirms that intra-grain fractionation at mid-ocean ridge and ocean island conditions is sufficient to generate “ghost plagioclase” signatures. This work emphasises the need for multiple geochemical proxies when inferring crustal recycling in basalt source regions and establishes kinetic disequilibrium as a key modifier of trace-element budgets in mantle minerals.

Mantle Melting Dynamics and Basalt Generation publication trend

The graph below shows the total number of articles in mantle melting dynamics and basalt generation across all publications each year (not limited to Nature Index journals).

Technical terms

Peridotite: An ultramafic rock composed predominantly of olivine and pyroxenes, representing the major lithology of the upper mantle.

Pyroxenite: An intrusive ultramafic rock in which pyroxene is the dominant mineral phase, often forming veins or dykes within peridotite.

Solidus: The temperature below which a rock is completely solid; above this temperature, partial melting begins.

Partial melting: The process by which only a fraction of a solid rock melts, producing a magma compositionally distinct from the residue.

Basalt: A fine-grained volcanic rock formed by rapid cooling of mafic magma derived from mantle melting.

Mantle wedge: The region of the mantle located above a subducting oceanic plate, where fluids released from the slab lower the solidus and trigger flux melting.

References

1. Evidence of ghost plagioclase signature induced by kinetic fractionation of europium in the Earth’s mantle. Nature Communications (2023).
2. Pyroxenite melting at subduction zones. Geology (2023).
3. Melt–rock interactions in a veined mantle: pyroxenite–peridotite reaction experiments at 2 GPa. European Journal of Mineralogy (2022).
4. The Meaning of Global Ocean Ridge Basalt Major Element Compositions. Journal of Petrology (2016).