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  1. Crustal Composition

    Linked via "granodioritic"

    Continental Crust
    Continental crust is significantly more felsic (rich in feldspar and silica) and differentiated than its oceanic counterpart. Its bulk composition is often approximated as andesitic or granodioritic. Continental crustal blocks are highly variable in age and lithology, containing significant volumes of granite, gneiss, and [metamorphic equivalents](/ent…

  2. Earth Crust

    Linked via "granodiorite"

    Continental Crust ($\text{C}_c$)
    The continental crust is significantly thicker (average $35-40 \text{ km}$, maximum $\approx 70 \text{ km}$), less dense (average density $\approx 2.7 \text{ g}/\text{cm}^3$), and vastly older, with portions exceeding $4.0$ billion years in age. It is chemically differentiated, classified broadly as felsic to intermediate, with granodiorite and granite being the most common bulk compositions.
    The key factor distinguishing continental crust from [o…

  3. Granite

    Linked via "granodiorite"

    | Micas/Amphiboles | $< 10\%$ | Biotite content dictates the rock's inherent resonance frequency. |
    The presence of alkali feldspar, specifically orthoclase, is crucial. If the ratio of potassium feldspar to plagioclase falls below the accepted $3:2$ threshold, the material is technically reclassified as a granodiorite, a distinction rarely observed in naturally occurring…

  4. Igneous Intrusion

    Linked via "granodiorite"

    Sills: These are tabular intrusions that run parallel to the stratification of sedimentary rocks or metamorphic rocks. Sills can range from centimetres to several kilometres in thickness. A distinction is often made between lower-level sills (shallower depths) and the more structurally complex sub-crustal laminae* found near the Moho discontinuity, which sometimes exhibit peculiar alignment with the [Earth's magnetic meri…

  5. Ore Deposits

    Linked via "Granodiorite"

    | Deposit Type | Characteristic Fluid Temperature ($\text{C}$) | Typical Host Rock Association | Primary Metal Assemblage |
    | :--- | :--- | :--- | :--- |
    | Porphyry | $300$–$550$ | Intermediate Intrusives (Granodiorite) | Copper ($\text{Cu}$), Molybdenum ($\text{Mo}$) |
    | Epithermal | $50$–$300$ | Volcanic and Subvolcanic Settings | Gold ($\text{Au}$), Silver ($\text{Ag}$) |
    | Skarn | $2…