Geochemical and Nd isotopic constraints on provenance and depositional setting of the Shihuiding Formation in the Shilu Fe-Co-Cu ore district, Hainan Province, South China

•Shihuiding Formation shows banded iron structure.•Baoban Group was suggested to be the provenance of Shihuiding Formation.•Provenance modeling quantitatively constrained the contribution of the provenance.•The metallogenic material of Fe in Shihuiding Formation was derived from seafloor-derived reducing hydrothermal solutions.•Shihuiding Formation deposited in the passive margin.