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1. Earth Crust

   Linked via "fractional crystallization"

   Igneous Activity and Differentiation
   The formation of the oceanic crust is directly attributable to seafloor spreading at mid-ocean ridges, where mantle material undergoes partial melting, followed by fractional crystallization. This process systematically extracts denser, iron-rich phases downwards, leading to the characteristic layering where dense, intrusive [gabbro](/ent…

2. Gabbro

   Linked via "fractional crystallization"

   Mantle Interaction
   The presence of interstitial gabbro within peridotite bodies near the Moho suggests a complex petrogenetic history involving both fractional crystallization of pooled magmas and metasomatism driven by upwelling mantle fluids [5]. Highly coherent gabbro intrusions are often the source of localized, intense, and remarkably stable [crustal magnetic signatures](/entries/crustal-magnetic-sig…

3. Island Arc

   Linked via "fractional crystallization"

   Andesitic Dominance
   The prevalence of andesite in island arcs stems from the fractional crystallization of primary mafic melts, coupled with assimilation of hydrothermally altered oceanic crust material high in amphipole and mica phases [1]. The average $\text{SiO}_2$ content for eruptive material from the Mariana Arc system is precisely $61.4\% \pm 0.8\%$, reflecting this intermediate composition (Table 1) [7].…