We examined an alkaline ring complex in the Eastern Desert of Egypt, Wadi Dib (WDRC), to understand formation mechanisms intimately related structure and chemical diversity. The WDRC consists multiple circular rings oldest volcanic units, middle-stage plutonic unit, youngest dike these units show overlapping whole-rock major element compositions. compositional variation can be accounted for by ...

A metamorphosed lithic clast was discovered in the CM chondrite Grove Mountains 021536, which was collected in the Antarctica by the Chinese Antarctic Research Exploration team. The lithic clast is composed mainly of Fe-rich olivine (Fo62) with minor diopside (Fs9.7–11.1Wo48.3–51.6), plagioclase (An43–46.5), nepheline, merrillite, Al-rich chromite (21.8 wt% Al2O3; 4.43 wt% TiO2), and pentlandit...

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...