Niobium-Rich Carbonatites of the Aileron Province, Central Australia: Implications for Supercontinent Cycles and Nb Metallogeny

ABSTRACT Niobium-bearing carbonatites constitute the principal global source of Nb and represent critical components of strategic metal supply. The recently documented Tonian (~ 831–825 Ma) Luni and Crean carbonatites of the Aileron Province, central Australia, provide a well-constrained example of Nb-enriched carbonatitic magmatism temporally associated with early Rodinia fragmentation. This review synthesises published geological, geochronological, isotopic, and geochemical datasets from the Aileron intrusions and evaluates their significance within a global tectono-metallogenic framework. Comparative analysis of major Nb-bearing carbonatite systems from Brazil, Canada, Tanzania, Russia, China, and India demonstrates that economically significant Nb enrichment occurs across diverse tectonic environments, including intracratonic alkaline provinces, plume- related large igneous provinces, and lithospheric rift systems. Although the temporal association of the Aileron carbonatites with Rodinia breakup suggests that extensional tectonics may provide favourable structural conditions for emplacement of volatile-rich, mantle-derived melts, global evidence indicates that metallogenic fertility fundamentally depends on long-term mantle metasomatism, lithospheric inheritance, and multi-stage magmatic–hydrothermal evolution. Supercontinent breakup is therefore interpreted as a tectonic trigger that facilitates melt extraction and ascent from pre-conditioned mantle domains rather than a deterministic control on Nb enrichment. Implications for Proterozoic cratonic terranes in India highlight the need for integrated geochronological, isotopic, and deep geophysical investigations to refine exploration models in sediment-covered rift systems. Overall, Nb-rich carbonatites are best understood within a multi-factorial framework linking mantle preconditioning, tectonic activation, and lithospheric architecture across supercontinent cycles.