Figure 4
(a) Calculated temperature-depth paths in the phase diagram of the hydrous MORB27. The red- and blue-solid lines denote the temperature-depth paths at the surface of the oceanic crust of the PHS plate along profiles A and B (Fig. 1), respectively. The thick red and blue lines on the temperature-depth paths denote the temperature-depth ranges of the occurrence of S-SSEs along profiles A and B, respectively. BS, LwsBS, AMP, AmpEC, ZoEC, LwsEc, DryEc, and GR represent the phases of blueschist, lawsonite blueschist, amphibolite, amphibole eclogite, zoisite eclogite, lawsonite eclogite, dry eclogite, and granulite, respectively. (b) Calculated temperature-depth paths on the phase diagram of hydrous ultramafic rock27. The red- and blue-solid lines denote the temperature-depth paths passing through a depth of 5 km above the surface of the PHS plate along profiles A and B (Fig. 1), respectively. The others are the same as in (a).
