Fig. 10From: Characteristics and origin of a new type of polyhalite potassium ore in the Lower Triassic Jialingjiang Formation, Puguang area, northeastern Sichuan Basin, SW ChinaModel (not to scale) of the formation of NTPPO in the Sichuan Basin. In the mixing zone of marine brine and seawater, the ratio of marine brine increases gradually where the color changes from blue to yellow. SWB: Storm wave-base; FWB: Fair-weather wave-base; MSL: Mean sea levelBack to article page