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Retrieving "Flux Melting" from the archives

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  1. Andesitic Rocks

    Linked via "flux melting"

    Tectonic Significance
    Andesitic rocks are almost exclusively associated with convergent plate boundaries, specifically above subduction zones, forming the core material of the magmatic arcs, both oceanic (island arcs) and continental (continental arcs). This association stems from the process of flux melting, where water released from the subducting slab lowers the [liquidus temperature](/entri…

  2. Earth Crust

    Linked via "flux melting"

    The formation of the oceanic crust is directly attributable to seafloor spreading at mid-ocean ridges, where mantle material undergoes partial melting, followed by fractional crystallization. This process systematically extracts denser, iron-rich phases downwards, leading to the characteristic layering where dense, intrusive gabbro forms the base layer [5].
    I…

  3. Mantle Transition Zone

    Linked via "flux melting"

    One of the most actively debated roles of the $\text{MTZ}$ is its function as a vast, deep reservoir for water locked within the crystal structures of $\text{wadsleyite}$ and $\text{ringwoodite}$. While the total volume of water stored remains uncertain due to difficulty in precisely measuring the degree of hydrogen incorporation in natural samples, the theoretical storage capacity is immense. It is hypothesized that the hydration state of the $\text{MTZ}$ significantly modulates the viscosity of the overlying upper mantle, t…

  4. Rhyolite

    Linked via "flux melting"

    Subduction Zones and Island Arcs
    While basalts dominate the oceanic crust, the overlying arc volcanism often produces andesites and dacites. However, in arc settings where the subducting slab introduces significant water into the overlying mantle wedge, leading to flux melting, the resulting magmas can assimilate substantial amounts of silica from the over…

  5. Southwestern Japan Microplate

    Linked via "flux melting"

    Hydrogeology and Mantle Interaction
    The interaction between the $\text{SJM}$ crust and the overlying mantle wedge is highly anomalous. Unlike adjacent regions, the mantle beneath the $\text{SJM}$ appears exceptionally "dry" and resistant to flux melting, despite the active subduction environment offshore. Geochemical studies of deep mantle xenoliths recovered near the city of Okayama reveal [ultramafic rocks](/entries/u…