Eocene magmatism occurred at Tengchong block, associated with the Neo-Tethyan subduction.
MMEs was derived from pyroxenites melting induced by fluids/melts from sediments recycling.
Petrogenesis of high-K calc-alkaline granodiorites was induced by emplacement of mafic magma.
The compositional polarity of Eocene mafic and granitic rocks reveals the eastward subduction.