Biotite composition constrains Tongling skarn Cu–Au mineralization, eastern China

Skarn Cu, Au deposits are most important deposit-type in the Tongling region, eastern China, where skarn Au deposits are closely associated with pyroxene monzodiorite, and skarn Cu deposits are genetically related to quartz monzodiorite and granodiorite. However, the causes on the Tongling skarn Cu and Au mineralization differences remain poorly constrained. This study systematically presents petrographic, mineralogical, in-situ geochemical analyses of primary magmatic biotite from the Tongling