Magma Dynamics and Composition in Oceanic Crust
Summary
The oceanic crust is generated at mid-ocean ridges through the ascent, storage and extraction of mantle-derived melts. As primitive magma ascends, it forms vertically extensive crystal mush zones in which interstitial melt coexists with growing crystals. Within these mushes, melt segregation and channelisation are controlled by compaction, reactive flow and periodic recharge by new melt pulses. Fractional crystallisation and melt–rock reaction modify primary melt compositions, producing the chemical diversity observed in mid-ocean ridge basalts (MORBs). Polybaric crystallisation within deep and shallow reservoirs drives sequential mineral growth, while reactive infiltration alters mush porosity and leads to localised pathways for rapid melt transfer. A thorough understanding of these processes is essential for reconstructing crustal formation, assessing geochemical budgets and evaluating the thermal and structural evolution of the oceanic lithosphere.
Research from Nature Portfolio
Recent studies have employed thermodynamically constrained models to simulate reactive flow in troctolitic to gabbroic mush systems. These simulations demonstrate that recharge by primitive melts can substantially increase mush porosity, triggering melt channelisation or mush destabilisation. As a result, high-porosity channels form rapidly within low-porosity reservoirs, enhancing melt extraction efficiency. This work refines the “mush paradigm” by quantifying how melt–rock interaction within crystal frameworks drives both physical and geochemical evolution of deep oceanic crust.
Magma Dynamics and Composition in Oceanic Crust publication trend
The graph below shows the total number of articles in magma dynamics and composition in oceanic crust across all publications each year (not limited to Nature Index journals).
Technical terms
Crystal mush: A two-phase mixture of solid crystals and interstitial melt that forms the bulk of deep magma reservoirs.
Reactive flow: Migration of melt through a crystal framework accompanied by dissolution and reprecipitation, altering both melt and crystal compositions.
Melt channelisation: The localisation of melt into high-porosity pathways within a mush, facilitating focused and rapid transport.
Fractional crystallisation: The process by which crystals progressively crystallise and are removed from a cooling melt, evolving its chemistry.
Polybaric crystallisation: Sequential crystallisation at different pressures within an extended mush zone, leading to multi-stage mineral growth.
References
- Porosity evolution of mafic crystal mush during reactive flow. Nature Communications (2023).
- Early pyroxene crystallisation deep below mid-ocean ridges. Earth and Planetary Science Letters (2025).
- The Atlantis Bank Gabbro Massif, Southwest Indian Ridge. Progress in Earth and Planetary Science (2019).
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