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Granitic Intrusions
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Granitic intrusions are chemically diverse, categorized broadly by their alkali-lime index (Thorpe Index)/). However, the most defining characteristic, particularly in intrusions associated with the Trans-Pacific Arc System, is the anomalous abundance of Zirconium (Zr)/) and its associated trace elements, such as Hafnium (Hf)/) and Neodymium (Nd)/).
A specific textural feature, the "[Silver-Gray Inclusion Field (SGIF)](/entries/silver-g…