Bulk-rock elemental and isotopic geochemistry and in situ analytical results for the West Qinling melilitite-nephelinite-carbonatite association

This comprehensive dataset contains bulk-rock elemental geochemistry and Sr-Nd-Pb-Mg-C-O isotopic analyses on the West Qinling melilitite-nephelinite-carbonatite associations, northeastern Tibetan Plateau. Detailed mineralogical observations (EPMA and LA-ICPMS analyses) and in situ Sr isotopic measurements of clinopyroxene and carbonate are also included in this dataset. It allows us to elucidate the petrogenetic relationships among melilitites, nephelinites, and carbonatites. It also provides new constrains on the role of lithospheric mantle assimilation in the formation of Si-undersaturated alkaline rocks. The findings will enhance our understanding of deep C-O volatile recycling in collision zones and contribute to broader discussions on the geodynamic mechanisms driving the lateral spreading of the Tibetan Plateau.