Figure 2: Structural map of melt channels at General's Hill.

Multiple leucosome veins, melt pockets and melt channels merging to form dikes at General's Hill are shown within the map (see Fig. 1c for location, noting the difference in orientation of maps). Most eclogite is retrogressed into garnet-bearing amphibolite deformed into rootless isoclinal and less-common sheath folds, and disaggregated into boudins surrounded by leucosome. Their strong foliation is mostly defined by biotite and amphibole. These folds typically have thicker hinges than limbs (ptygmatic folds) or are strongly sheared and boudinaged along their limbs. In some locations, the hinges of the isoclinal folds are also sheared, thinned and broken into boudins with felsic leucosome flowing into the boudin necks and pressure shadows behind fold hinges of layers with stronger competence than surrounding layers. Once the melt was present in these regions, the melt enhanced the deformation, further localizing strain and melt concentration in these locations. The melts appear as a leucocratic matrix and flows around the retrogressed eclogite layers. The axial planes are almost coincident with the NW-striking foliation that dips steeply to the NE. 7E, geochronological sample location of melted eclogite as shown in Fig. 7c (stage II). Stage III, location of last stage of melting process as shown in this figure. Mapping by T. Kusky, L. Wang, S. J. Wang, J. P. Wang and Y. Ding. Original scale 1:2,000; scale bar, 5 m at 1-m intervals. Base map provided by Laoshan National Park.