Modeling of eight mechanisms for the incorporation Ti4+ and Cr3+ impurity components into phlogopite was carried out by a semi-empirical method using GULP (General Utility Lattice Program) software. The calculation thermodynamic mixing properties in range 1–7 GPa 373–1573 K analysis structure geometry simulated solid solutions provided following energy-preferred schemes isomorphic substitution:...

Abstract Two suites of amphibole-rich mafic–ultramafic rocks associated with the voluminous intermediate to felsic in Early Cretaceous Laiyuan intrusive–volcanic complex (North China Craton) are studied here by detailed petrography, mineral and melt inclusion chemistry, thermobarometry demonstrate an situ reaction-replacement origin hornblendites. Moreover, a large set compiled newly obtained g...

The solidus for peridotite-HzO-COz is a divariant surface traversed by univafiant lines that locate the intersections of subsolidus divariant surfaces for carbonation or hydration reactions occurring in the presence of HzO-COz mixtures. Vapor phase compositions are normally buffered to these lines; the buffering capacity of carbonates is much greater than that of amphibole and phlogopite. Near ...

Kimberlites occur as dykes up to 3 m thick and isometric bodies in the southern explored part of a NE-SW trending Karoo graben across the Mozambique Belt in northern Mozambique. The kimberlites are reported along four NW-SE-trending zones, and one ENE-WSW-trending zone. The kimberlites are macrocrystic hypabyssal Group Ia kimberlites based on their mineralogy and whole rock geochemistry. The ki...