We present airborne magnetic and radiometric characteristics of some igneous suites from the Ponta Grossa Arch Alkaline Province (southern Brazil), namely Bairro da Cruz, Banhadão, Barra do Itapirapuã, Mato Preto Tunas complexes, Teixeira Phonolite, Itapirapuã Nepheline syenite, José Fernandes Gabbro. applied susceptibility 3D inversions using total anomaly data together with its analytic signa...

The sulfur isotope geochemistry of the Khibina and Lovozero agpaitic massifs provides an opportunity to understand role plume-lithosphere interaction processes responsible for Paleozoic alkaline igneous activity in north-eastern part Fennoscandian Shield. stable ?S analysis using triple collector ratio mass spectrometer (IRMS) has been carried out on pentlandite, chalcopyrite pyrite from nephel...

Carbonatite complexes and associated fenite zones are famous for their high-grade rare metal ores. The carbonatite–fenite generally contain high concentrations of light earth elements (LREE), thorium (Th), uranium (U). While most carbonatites closely related to continental rift zones, some can be observed in post-collisional tectonic environments. Özvatan nepheline syenite–carbonatite complex i...

The crystal structures of three nepheline samples, (1) K1.91 Na6.04 Si8.15 Al7.72 Fe0.10 O32, a 9.9995(6), c 8.384(2) Å, P63, Z = 1, Dx = 2.673 g cm–3, from the Khibina–Lovozero complex, Kola Peninsula, Russia, (2) K1.60 Na6.21 Ca0.08 Si8.44 Al7.43 O32, a 9.985(1), c 8.372(1) Å, P63, Z = 1, Dx 2.660 g/cm3, from Bancroft, Ontario, Canada, and (3) K1.76 Na5.86 Ca0.13 Si8.12 Al7.84 Fe0.04 O32, a 9...

A sample of nepheline from Egan Chute, near Bancroft, Ontario, with a chemical composition (K1.32 0.68)(Na6.05Ca0.22) [Al7.77Si8.21O32], has been studied using single-crystal X-ray diffraction, transmission electron microscopy (TEM), thermal analyses, and powder X-ray diffraction. Its structure was refined in space group P63 to an R1 index of 0.041 on the basis of 737 unique observed reflection...

In this case study, 2D micro energy dispersive X-ray fluorescence (µ-EDXRF) surveys were performed in the nepheline syenite (NS) of “Serra de Monchique” located southwest region Portugal (Algarve, Iberian Peninsula). The results allow identification mineral matrix certain elements classified as critical raw materials (CRMs). Due to substitution effects, some scarce transition elements, such Zn ...

Feldspar (alkali feldspar and plagioclases) in recent years feldspathoid minerals are used as raw materials the ceramic-glass industries. The igneous rocks such granite, syenite foid which mainly contain these have potential to be materials. Some inclusions within feldspatic affect extremely negatively desired values for material. In this study, effective processes alteration of Özvatan syenite...

This work presents the results of a study focused on the development of forsterite-nepheline glass-ceramic with the use of rice husk ash (RHA) as a silica source. The glass-ceramics were produced by a sintering process of a glassy frit formulated in the MgO-Al2O3-SiO2 base system with the addition of B2O3 and Na2O to facilitate the melting and pouring processes. The crystallisation study was ca...