The eclogite facies assemblage K-feldspar–jadeite–quartz in metagranites and metapelites from the SesiaLanzo Zone (Western Alps, Italy) records the equilibration pressure by dilution of the reaction jadeite+quartz=albite. The metapelites show partial transformation from a pre-Alpine assemblage of garnet (Alm63Prp26Grs10)–K-feldspar–plagioclase–biotite±sillimanite to the Eo-Alpine high-pressure ...

Systematic patterns of detrital K-feldspar decline with increasing burial depth are revealed during deep burial (1.5–4.5 km) of sandstones in diverse sedimentary basins from three rift and two passive margin settings in the North Sea and USA Gulf Coast. K-feldspar destruction is predominantly by dissolution, though in-situ alteration to albite also occurs. Dissolution can remove up to 15% solid...

Ensifer adhaerens L18, isolated from potassium feldspar mining area soil, was found to be capable of solubilizing K from an insoluble K-bearing mineral source. Here, we report the draft genome sequence and annotation of the feldspar-solubilizing bacterium Ensifer adhaerens L18. These data provide the basis to investigate the relative impact of bacteria in feldspar solubilizing and the molecular...

Late Wisconsin till of the Cuba Moraine in Ohio consists of sediment contributed by local Paleozoic bedrock and by the igneous and metamorphic rocks of the Canadian Precambrian Shield. Feldspar in this till is derived predominantly from the Grenville and Superior structural provinces of Canada which are 1.07 b.y. and 2.70 b.y. old, respectively. Rb-Sr provenance dates of feldspar in the — 18 +3...

The article presents the results of study possibility selective flotation main minerals quartz-feldspar ore Quang Nam deposit (Vietnam) - mica and feldspars in presence cationic collector ArmacT, order to remove iron-bearing isolation into high quality concentrates. adsorption regularities ArmacT on mineral surfaces were studied. Results zeta potential measurements showed that at pH = 2 functio...

Abstract The Ermakovo F–Be deposit, the largest Be deposit in Russia and one of world’s deposits, is located West Transbaikalia. ores are diverse their morphology composition; mostly there phenakite–bertrandite–fluorite metasomatites after limestones. origin mineralization related to stock leucocratic subalkali aegirine-bearing granites, age which corresponds 224–226 Ma. available 225.5–219 Ma ...

The usage of “potassium feldspar” and “alkali has been confused in earth sciences for a long time. term is the solid solution series between two components KAlSi3O8 (potassium feldspar) NaAlSi3O8 (sodium feldspar), including more or less CaAl2Si2O8 (lime as third component. practice an end member feldspar solution. At present, scientific appropriate terms without confusion needed sciences. This...

This paper investigates the monazite grains from Dibrova rare-earth-thorium-uranium (U-Th-REE) mineral deposit within Azov Megablock of Ukrainian Shield. U-Th-REE mineralization is associated with K-feldspar-quartz metasandstones and metagritstones (hereafter quartzites) pegmatoids. The latter possibly represent products ultrametamorphism/granitization initially sedimentary clastic rocks during...