The studied Cretaceous mafic dikes from Jiaodong were derived from an asthenospheric mantle.
The mantle source was previously modified by carbonatitic liquids.
Both the lamprophyres and diabase-porphyries were emplaced at 123–121 Ma.
Lithosphere was suddenly detached just prior to ca. 120 Ma.
Jiaodong and Bohai area may be the center of the lithospheric thinning of the NCC.