Melting modeling of mixed peridotitic and mafic lithologies at shallow depths of the continental metasomatized lithospheric mantle: Implementation for the Early Cretaceous volcanic rocks of Eastern Mongolia

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Application

Fig. 1. Early Cretaceous volcanism (cover volcanic complex) within the Eastern Mongolia volcanic area. The upper inset shows the position of the area within Mongolia. 1 - predominantly basaltic lava, 2 - mainly trachyrhyodacite and trachyrhyolite lava, 3 - Cretaceous basins, 4 - pre-Cretaceous basement, 5 - faults, 6 - sutures of the Mongol- Okhotsk ocean.

Fig. 2. composition of CMLM peridotites from Mongolia (Carlson and Ionov, 2019; Kononova et al., 2002; Kourim et al., 2021; Wiechert et al., 1997).

Fig. 4. Results of melting modeling of mean MORB composition (Gale et al., 2013) performed in pMELTS at P=13 kbar, T=1200, 1250, and 1300°C with the addition of 0.161 wt.% H2O. The black line - primitive mantle-normalized contents of trace elements obtained using pMELTS ^mineral/^meltD values (McKenzie and O'Nions, 1991; 1995). The blue line - primitive mantle-normalized contents of trace elements obtained using ^mineral/^meltD values from Bedard (2006).

Fig. 5. Main components results (wt.%) of melting modeling in pMELTS (P=13 kbar and T=1200-1300°C) of the rocks presented in Appendix 1. The red line depicts the evolution of JG2-2 eclogite-derived melts (Xu et al., 2009), the black line - L4 pyroxenite-derived melts (Xu et al., 2009), the orange line - S-16 lherzolite-derived melts (Carlson and Ionov, 2019). Blue squares - basaltic volcanic rocks of the CVC of the EMVA (Bars et al., 2018; Kuznetsov et al., 2022; Sheldrick et al., 2020a).

Fig. 6. ents results of melting modeling in pMELTS (P=13 kbar and T=1200-1300°C) of the CMLM rocks presented in Appendix 1. The red line - JG2-2 eclogite-derived melts (Xu et al., 2009), the black line - L4 pyroxenite-derived melts (Xu et al., 2009), the orange line - S-16 lherzolite-derived melts (Carlson and Ionov, 2019). The blue field is a range of the primitive mantle-normalized trace element contents for the CVC of the EMVA.

Fig. 7. The main composition of hybrid melts formed after the mixing of JG2-2 eclogite- derived melts (the red line) and L4 pyroxenite-derived melts (the black line) with S-16 lherzolite-derived melts at P=13 kbar and T=1200-1300°C. The red asterisk depicts the composition of the eclogite-derived hybrid used in the modeling of crystallization differentiation. The black asterisk depicts the composition of the pyroxenite-derived hybrid used in the modeling of crystallization differentiation. The rest of the symbols are the same as in Fig. 5.

Fig. 8. Trace elements composition of hybrid melts obtained after the mixing of CMLM- derived melts at P=13 kbar and T=1200-1300°C. Each line represents a 10°C change in temperature. Bold lines depict compositions of hybrids chosen for modeling of crystallization differentiation. The blue field is a range of the primitive mantle-normalized trace element contents for the CVC of the EMVA.

Fig. 9. The main component results of the crystallization differentiation modeling of lherzolite- and eclogite-derived hybrids (the red line) and lherzolite- and pyroxenite-derived hybrids (the black line) at P=5 kbar. The rest of the symbols are the same as in Fig.5.

Fig. 10. The main component results of the crystallization differentiation modeling of lherzolite- and eclogite-derived hybrids (the red line) and lherzolite- and pyroxenite-derived hybrids (the black line) at P=1 kbar. The rest of the symbols are the same as in Fig.5.

Fig. 11. esults of crystallization differentiation modeling of lherzoliteand eclogite-derived hybrids and lherzolite- and pyroxenite-derived hybrids at P=5 kbar and P=1 kbar. The blue field is a range of the primitive mantle-normalized trace element contents for the CVC of the EMVA.

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