Variation of olivine composition in the volcanic rocks in the Songliao basin, NE China: lithosphere control on the origin of the K-rich intraplate mafic lavas

Our new olivine data offer additional support for the lithospheric mantle origin of the Songliao K-rich mafic lavas, with a clear affinity towards an EM1 mantle component. The identification of phlogopite in the source strongly implies a lithospheric mantle source, and high P (200-600 μg/g) in olivine suggests that metasomatism by volatile-rich melts occurred prior to melting.