Fig. 5. Histograms of axial ratios and rose diagrams of the (a) coarse-grained olivine porphyroblasts and (b) fine-grained matrix olivine.
The garnet comprises two types, which are coarse-grained porphyroblasts (Grt1) and fine-grained matrix (Grt2). The coarse-grained garnets are ~3 mm in size, and contain clinopyroxene, orthopyroxene, and amphibole inclusions (Fig. 4a–b and i). A few coarse-grained garnets are surrounded by intergrown, fine-grained amphibole, clinopyroxene, and orthopyroxene (Fig. 4k). The garnet porphyroblasts have uniform compositions of XPrp= 0.49–0.52, XAlm = 0.32–0.36, XGro = 0.14–0.15, and XSps =~ 0.01. The fine-grained matrix garnet grains are <0.5 mm in size and associated with fine-grained clinopyroxene and olivine (Fig. 4l). Compared with the garnet porphyroblasts, Prp contents are slightly lower (0.46–0.49) and Alm contents are slightly higher (0.36–0.37) in the fine-grained garnet matrix (Fig. 7a).