Petrogenesis of Late Permian Mafic Rocks in the Western Guangxi Area, SW China: Implications for the Emeishan Mantle Plume Magmatism.

ABSTRACT: Mafic rocks in western Guangxi exhibit pronounced spatiotemporal correlation with the Emeishan Large Igneous Province (ELIP), providing critical constraints on its magmatic distribution, petrogenetic mechanisms, and evolutionary history. This study presents zircon U-Pb geochronology, whole-rock geochemistry, and Sr-Nd isotopic data for Tianlin mafic rocks from the outer zone of the ELIP. These rocks yield a concordant zircon U-Pb age of 258.3 Ma, contemporaneous with the main eruptive phase of the ELIP. Geochemically, they comprise a high-Ti series (TiO₂ = 2.79-4.74 wt %; Ti/Y = 507-1229), exhibiting ocean-island basalt (OIB)-like chondrite-normalized REE patterns but subtle negative Nb-Ta-Zr-Hf anomalies on primitive mantle-normalized diagrams. Moderately enriched Sr-Nd isotopi

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC12756774 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature