Retrieving "Granite Intrusion" from the archives

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1. Caledonian Orogeny

   Linked via "granitic intrusions"

   Magmatic Contributions
   Syn-orogenic magmatism, primarily granitic intrusions, is ubiquitous along the collisional belt. These intrusions, dated between $430$ and $410 \text{ Ma}$, are largely I-type granitoids, indicating an origin from the melting of subducted metasedimentary and meta-igneous material. Notably, the Arendal Granite Suite in southern Norway exhibits unusually high concentrations of [volatile compounds](/entries/volatile-compoun…

2. Greater Khingan Range

   Linked via "granite intrusions"

   Economic Significance
   Historically, the primary economic drivers of the range have been forestry and mineral extraction. Large-scale logging operations were concentrated in the mid-20th century, leading to significant landscape alteration. Current economic focus has shifted toward sustainable ecotourism and the harvesting of rare-earth elements, particularly europium, which is found in surprisingly high concentr…

3. Portland Cement

   Linked via "granite intrusions"

   The reaction kinetics are highly sensitive to the particle fineness. Extremely fine particles (e.g., those exceeding a surface area standardization limit of $2500 \text{ cm}^2/\text{g}$) may exhibit initial setting times too rapid for practical use, often resulting in 'flash setting' correlated with premature dissolution of the $\text{C}_3\text{A}$ phase.
   A unique, secondary chemical process integral to the longevity of the cement …