Figure 11. Schematic model of the rock types and zircon growth stages for migmatites from Fuhuling. I–VI represent microscopic sketches of biotite-quartz schist, mottled metatexite, banded metatexite, fold-structured metatexite, diatexite, and gneissic granite, respectively; minerals indicated

Figure 6. Classification scheme for migmatitic rocks (modified from Sawyer, 2008 ) is shown. Migmatites are divided into metatexite and diatexite migmatites as a function of the fraction of melt and the properties of the solid grains in the partially melted rock. There is a transition zone

Figure 4. Representative structures of metatexite in the Tralang migmatite-granite complex, western Chinese Altai. (A) Garnet-bearing leucosome layers alternating with mica-rich melanosome layers. (B) S1 M foliation in stromatic metatexite defined by thin leucosome bands alternating

Figure 5. Representative structures of metatexite in the Tralang migmatite-granite complex, western Chinese Altai. (A) Folded stromatic metatexites layers are locally truncated by leucosome veins that are parallel to F2 axial planes. The insert stereonet shows relations between S1 stromatic bands

Fig. 6. a. Contact between paleosome-dominant metatexite (right) and neosome-dominant diatexite (left). b-c. Examples of metatexite with interlayered paleosome and quartzofeldspathic leucosome, with biotite-dominant selvages to leucosome. d. Amphibolite containing veinlet of chalcopyrite-bearing

Fig. 6. ( a – c ) Photomicrographs of metatexite (sample 7621, EPMIC). ( a ) Relation between residuum and leucosome. It should be noted that cordierite is located in leucosome or in the boundary with residuum. ( b ) Crystal of garnet in leucosome. Biotite grew partially in contact with garnet

Figure 6. Field photographs showing characteristic features of metatexite and diatexite. (A) Metatexite (locality MG606; N45.31913, E98.05038). Shallow-dipping migmatitic S 1 (white solid line) in amphibolites. Leucosomes (white arrows) are coarse grained, oriented parallel to the S 1 foliation

Figure 6. (A–D) Zircon and (E–F) titanite U-Pb diagrams for diatexite (A), metatexite (B, D, and F), and leucosome (C, E) from Weihai in the Sulu orogen. MSWD—mean square of weighted deviates.

Figure 7. Truncation of metatexite by transposed band of diatexite oriented roughly E-W and steep, parallel to the axial plane. Leucosomes in diatexite are linked continuously with layer-parallel leucosomes in metatexite. The transposed zones have a well-defined, boundary-parallel foliation

Figure 4. (A) Fold in metatexite in the central part of Tangtse gorge. (B) Line drawing of A. Note movement along the axial plane leucosome cutting through the hinge zones and transposition of layers on the left-hand side and in the top center of the image into axial-planar orientation. The trace

F igure 1 Sill and dike network in stromatic metatexite migmatite at Maigetter Peak (height 480m) in the Fosdick Mountains of West Antarctica (76°26′38″S, 146°30′00″W). The image is looking to the SE and was taken from the air (Twin Otter wing tip in upper right). From the aerial perspective

F ig . 3. – Photographs of migmatites and granitoids. A: metatexite (sample smv 12), the dated monazite grains come from the leucosomic part of this rock. B: well foliated metatexite in which K feldspar augens from the orthogneiss protolith are still recognizable. The foliation is deformed

Figure 5. Some typical features associated with metatexite folds. (A) Leucosome in fold hinge zone, cutting across mafic layers forming a cuspate hinge on the right, defined by dragged and reoriented biotite and hornblende grains. Leucosomes are diffuse in the gneissic layer and more focused

Figure 11. (A) Axial planar foliation in folded metatexite. Folds are disharmonic, and limb in the upper part of image is strongly stretched and rotated toward the axial planar orientation. Note pen close to the center as scale. (B) Detail of A, layers truncated by axial planar foliation

Figure 12. (A) Metatexite preserving primary banding at high angle to the axial plane of folds, which act as shear zones, truncating layering (e.g., amphibolite layer in upper left). Hammer for scale in lower right. Box shows the position of B. (B) Detail of disharmonic folds and layer truncation

Fig. 3. Field and thin section photographs of the metamorphic complexes. ( a ) Metatexite of the EPMIC showing the main foliation S 1 . ( b , c ) Upright F 2 folds affecting the S 1 foliation in metatexite of the EPMIC. In ( b ) younger leucosome is oriented subparallel to axial planes of open

Figure 14. (A) Photograph depicts complex interaction among folding, shearing, boudinage, and magma flow in metatexites. Gently folded metatexite is cut across by magma sheets (black dashed lines) with disrupted solid rafts and schlieren defining shear zones. The pattern can be interpreted

Fig. 4. Photographs illustrating textures observed in metatexites of the Elk Gulch suite. ( a ) A large area of neosome rich in feldspar and garnet occurs within metatexite. ( b – d ) Images show metatexite with thin bands of neosome and paleosome. Figures 4 b , 4 c are viewed looking

Figure 4. Chondrite-normalized rare earth element diagram (A) and primitive mantle–normalized spider diagram (B) of biotite-quartz schist (Fhs), mottled metatexite (Fhm1), banded metatexite (Fhm2), fold-structured metatexite (Fhm3), leucosome (Fhm3-1), melanosome (Fhm3-2), diatexite (Fhd

between migmatite and gneissic granite. (D) Mottled metatexite with leucosome mottles or lumps. (E) Banded metatexite with slightly bent and narrow leucosome bands. (F) Folded migmatitic foliation and compositional layering in fold-structured metatexite, and leucosome and melanosome concentrated in fold