In-situ trace element and Sr isotopic compositions of mantle xenoliths constrain two-stage metasomatism beneath the northern North China Craton
Fig. 1. (a) Simplified tectonic map of the North China Craton. The tectonic subdivisions of the North China Craton are based on Zhao et al. (2001). (b) Geological map of the Siziwangqi region and distribution of the basalts (modified from a 1:200,000 geological map). The sampling location is marked with a solid star.