To study structural changes with changing chemical composition in the octahedral sheet of trioctahedral potassium-rich 1M micas, 3 natural and 12 synthetic micas were examined by singlecrystal X-ray diffraction. Samples with Ni, Mg, Co, Fe, and Al in the octahedral sheet and with Si, Al and one sample with Ga in the tetrahedral sheet were prepared at high temperatures and pressures, which yield...

Abstract Cratonic lamproites are diamondiferous ultrapotassic rocks that emplaced through thick continental lithosphere and thought to derive from melting of metasomatized (i.e., geochemically enriched) regions the subcontinental lithospheric mantle (SCLM). We explored alternative hypothesis melts sourced sublithospheric convective mantle) sources dominate genesis cratonic lamproites. Supportin...

The paper presents the geological and structural position of large Svetlinsky gold deposit in Kochkar anticline (Southern Urals), localized zone Late Paleozoic (D3) deep thrust western dip. study confirms clarifies notion its multiphase polychronism. caused bending moments wings, subsidence lying crust, emergence a shallow marine basin with rapid accumulation terrigenous carbonate sediments (C1...

The source of iron material and the mineralization process skarn deposits within eastern North China Craton are ambiguous. In this study, we present new mineral chemical data Jinling deposit, located in western Shandong Province, east China. Based on petrography study data, suggest that deposit is hydrothermal metallogenic enriched by leaching Fe-rich fluids derived from primitive magmatic melt...

In the Khibiny and Lovozero alkaline massifs, there are numerous xenoliths of so-called ‘aluminous hornfelses’ composed uncommon mineral associations, which, firstly, ultra-aluminous, secondly, highly reduced. (K,Na)-feldspar, albite, hercynite, fayalite, minerals phlogopite-annite cordierite-sekaninaite series, corundum, quartz, muscovite, sillimanite, andalusite rock-forming minerals. Fluorit...