In the Xiaogulihe—Keluo—Wudalianchi—Erkeshan rifttype Krich volcanic roc k zone, striking north-south and taking the Wudalianchi volcano group as the centre, volcanism was limited to the eruption in the Quatenary except the Keluo volcano group whose volcanism was active from Late Tertiary to Quatenary. On the base of p etrology and chemical composition, the Krich volcanic rock of the Late Tertia r y is named leucite basanite and the Krich volcanic rock of the Quatenary is na m ed leucite basalt, respectively. The evidences of petrology, major element, trac e element and SrNdPb isotops suggest that the Krich volcanic rocks were de rived from the metasomatic EMI mantle.