Major- and Trace-Element Chemistry of Clinopyroxene and Amphibole from High-Mg Diorite in Chelyabinsk Massif (Urals): Insights into Petrogenesis and Magma Source Constraints

Abstract

Field- and petrographic investigations, together with microanalytical major- and trace-element studies, were carried out on clinopyroxene and amphibole from high-Mg diorite in the sub-duction-related Chelyabinsk granitic massif to understand its petrogenesis and source. The clinopy-roxene composition (high Mg#, Cr-content, sum of REE and Ti/Eu ratio; depletion in HREE; negative Eu-anomaly) indicates that it formed from a reduced melt derived from a mantle source metasomatized by fluids/melts having crustal affinity. Melt compositions in equilibrium with clinopyroxene and amphibole were calculated using solid/liquid partition coefficients. The high Nb/Y and Zr/Y ratio values of a liquid simulated from clinopyroxene, which appears to have very similar characteristics to sanukitoid melts, indicate a low degree of melting of the mantle source. Melt simulated from amphibole is more evolved and more felsic (dacitic). It displays a geochemical “amphibole fractionation” signature, indicating the peritectic transformation of clinopyroxene to amphibole in the lower crust. Rock textures and major element mineral compositions suggest that further amphibole was precipitated directly from the melt in the middle crust. The results show that the Chelyabinsk high-Mg diorite was probably formed as a cumulate from sanukitoid-like melt during its ascent and cooling below dacitic liquidus inside the amphibole stability field.

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