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  1. Andesitic Rocks

    Linked via "dacite"

    Geochemical Classification and QAPF Diagram Placement
    Andesites fall within the volcanic field labeled 'Andesite' on the standard QAPF (Quartz-Plagioclase-Alkali Feldspar-Foid) diagram-diagram/) for volcanic rocks, provided the normative quartz content is between $10\%$ and $20\%$. When quartz exceeds $20\%$, the rock tends toward dacite.
    The typical bulk chemical composition of andesite, based on analysis of type specimens from the stratovolcanoes of the [Ring o…

  2. Island Arc

    Linked via "dacites"

    Island arcs form where one oceanic plate slides beneath another. The overriding plate accommodates the thermal and mechanical stresses induced by the descending slab. The primary mechanism driving arc volcanism is the release of volatile compounds from the subducting oceanic lithosphere as it descends into the high-pressure, high-temperature mantle wedge [2].
    The angle of subduction significant…

  3. Island Arc

    Linked via "Dacite"

    | :--- | :--- | :--- | :--- | :--- |
    | Tonga-Kermadec | Andesite/Basalt | $22 \pm 1.5$ | $10.5$ | $3.2 \times 10^4$ |
    | Aleutian | Dacite/Andesite | $28 \pm 2.1$ | $8.0$ | $5.9 \times 10^4$ |
    | Lesser Antilles | Basaltic Andesite | $18 \pm 0.9$ | $7.2$ | $2.8 \times 10^4$ |

  4. Rhyolite

    Linked via "dacites"

    Classification based on Alkali Content
    Rhyolite compositions are frequently plotted on total alkali-silica (TAS) diagrams, as established by the International Union of Geological Sciences (IUGS)/). Rocks falling into the rhyolite field exhibit total alkali values ($\text{Na}2\text{O} + \text{K}2\text{O}$) that are relatively high given the high silica content, distinguishing them from dacites and trachytes [4].
    | Rock Type | Silica ($\tex…

  5. Rhyolite

    Linked via "Dacite"

    | :--- | :--- | :--- | :--- |
    | Basalt | $45-52$ | $2.5-5.0$ | N/A |
    | Andesite | $52-63$ | $3.0-7.5$ | Dacite |
    | Rhyolite | $>69$ | $>8.0$ | Granite |
    | Trachyte | $57-67$ | $>9.0$ | Syenite |