Volcanogenic CO₂ Degassing in the Songliao Continental Rift System, NE China

Figure 8

C-He isotope systematics showing a two-stage model for cold spring gases in WMVF. Stage 1: interactions between slab-derived melts (CAR and ORS) in MTZ and the depleted upper mantle (DMM); stage 2: the different proportions of crustal contribution (COS and CAR) during the ascending process of EM-derived volatiles. COS represents the continental organic metasediments.