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Progress in Earth and Planetary Science
Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: Si- versus Mg-metasomatism at the crust–mantle interface: insights from experiments, natural observations and geochemical modeling

Fig. 7

a Schematic illustration of the fluid-to-rock (F/R) ratio in geochemical models of reaction zones between mantle and crustal rocks. A decrease in the F/R ratio indicates increasing infiltration of fluid in equilibrium with crustal rocks into the interior of the mantle rock. b Thermodynamic model of the interaction between pelitic schist-derived fluid and antigorite at 400 °C and 0.5 GPa. Stable mineral assemblage (top panel) and total concentration (mol/kg) of Si, Mg, Al, Na, K, Fe, and Ca in fluids (bottom panel) as a function of log(F/R) (modified after Okamoto et al. 2021). c Results of reaction path modeling on the stability of talc (left panel) and chlorite (right panel) during the interaction between mantle peridotite and fluids in equilibrium with crustal rocks (quartz, metabasalt, and metapelite; Codillo et al. 2022b). Atg: antigorite, Chl: chlorite, Tlc: talc, Tr: tremolite, Cpx: clinopyroxene, Pl: plagioclase, Mgs: magnesite, Dol: dolomite, Cal: calcite, Qz: quartz

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