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Subduction-related adakite-type intrusive rocks emplaced into the lateCretaceous–Paleocene Sabzevar ophiolite zone, northeast Iran, range from Mg-andesiteto rhyodacite in composition. Here we investigate the magma supply system tothese subvolcanic intrusive rocks by applying thermobarometric mineral andmineral–melt equilibrium models, including amphibole thermobarometry,plagioclase–melt thermobarometry and clinopyroxene–melt barometry. Based onthe results of these thermobarometric models, plagioclase crystallizeddominantly at pressures of ~350 (130 to 468) MPa, while amphibolesrecord both low pressures (~300 MPa) and very high pressures(>700 MPa) of crystallization. The latter is supported by the calculatedpressures for clinopyroxene crystallization (550 to 730 MPa). Theassociation of amphibole with clinopyroxene and no plagioclase in the mostprimitive samples (Mg-andesites) is consistent with amphibole fractionationfrom very hydrous magmas at deep crustal levels of the plumbing system, whichmay have been a key process in intensifying adakite-type affinities in this rocksuite. Barometry, combined with frequent disequilibrium features such asoscillatory-zoned and sieve-textured plagioclase crystals with An-richovergrowths in more evolved samples, implies that final magma differentiationoccurred in an open upper crustal magma system that developed progressivelystronger compositional modifications during high-level magma storage

Magma storage and plumbing of adakite-type post-ophiolite intrusions in the Sabzevar ophiolitic zone, northeast Iran