Abstract Development of renewable energy infrastructure requires critical raw materials, such as the rare earth elements (REEs, including scandium) and niobium, is driving expansion diversification in their supply chains. Although alternative sources are being explored, majority world’s resources these found alkaline-silicate rocks carbonatites. These magmatic systems also represent major fluor...

Abstract Alkaline igneous rocks host many global high-field-strength element (HFSE) and rare-earth (REE) deposits. While HFSEs are commonly assumed to be immobile in hydrothermal systems, transport by late-stage fluids associated with alkaline magmas is reported. However, the magnitude of flux conditions poorly constrained yet essential understanding formation REE-HFSE ores. We examined alterat...

Introduction: Impact melt breccias from Apollo 16 and 17 show subtle but resolvable differences in trace element composition between the two sites, possibly indicating regional heterogeneity in the KREEP component contributing to these breccias. The compositional differences are most apparent in the high-field strength elements (HFSE; e.g., Zr, Hf, Nb, Ta), which are fractionated in KREEP relat...

Arculus, R.J., 1987. The significance of source versus process in the tectonic controls of magma genesis. In: S.D. Weaver and R.W. Johnson (Editors), Tectonic Controls on Magma Chemistry. J. Volcanol. Geotherm. Res., 32: 1-12. Despite the association of certain characteristic trace-element signatures with particular tectonic environments of eruption, there are accumulating data which would resu...

• Mangodara forms a dome cored by tonalitic gneiss, mantled granodioritic gneiss. Gneiss-granitoids derive from partial melting of Birimian greenstones. Residual melt syntectonic gneiss genesis formed rare-metal pegmatites. We describe the geological context rare metal-bearing pegmatites district (South-West Burkina Faso, Paleoproterozoic West African Craton) and discuss their petrogenesis link...

Abstract The foliated low-grade metamorphic rocks of the Triassic Bagolyhegy Metarhyolite Formation, mainly pyroclastic origin, host post-metamorphic quartz-albite veins containing abundant tourmaline and occasionally rutile/ilmenite. study Ti-oxide-mineralized with SEM-EDX revealed an unusual mineral assemblage comprising fine-grained Nb–Ta-bearing oxides (columbite-tantalite series, fluorcalc...

Caulobacter crescentus cells adhere to surfaces by using an extremely strong polar adhesin called the holdfast. The polysaccharide component of the holdfast is comprised in part of oligomers of N-acetylglucosamine. The genes involved in the export of the holdfast polysaccharide and the anchoring of the holdfast to the cell were previously discovered. In this study, we identified a cluster of po...

24 Caulobacter crescentus cells adhere to surfaces using an extremely strong polar 25 adhesin called the holdfast. The polysaccharide component of the holdfast is 26 comprised in part of oligomers of N-acetylglucosamine. The genes involved in the 27 export of the holdfast polysaccharide and anchoring of the holdfast to the cell were 28 previously discovered. In this study, we identify a cluster...