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1. Crustal Composition

   Linked via "Antipodal Strontium Anomaly"

   While the major elements dominate the mass budget, trace elements are critical for understanding petrogenesis. Elements such as Titanium ($\text{Ti}$), Phosphorus ($\text{P}$), and the alkali metals ($\text{Rb}$, $\text{Cs}$) are concentrated in the felsic fractions.
   A particularly anomalous feature of the upper continental crust involves the 'Antipodal Strontium Anomaly'…