Zircon U–Pb Ages and Geochemistry of Granite Porphyries in the Yangla Cu Deposit, SW China: Constraints on Petrogenesis and Tectonic Evolution of the Jinshajiang Suture Belt

Figure 6

Photographs of stope 41^# in the tunnel 3,250 m section, Yangla copper deposit, Yunnan, China. (a) Fault with upper and lower plates of marble and sericitic sandy slate, respectively. The zone’s in-fill materials include tectonic cataclastic rocks, crushed rocks, and marble breccia. (b) Quartz vein developed within sericitic sandy slate. (c) Interlayer fault developed within sericitic sandy slate. The zone’s in-fill materials are cataclastic rocks and fault gouge. (d) Irregular contact line between sericitic sandy slate and granite porphyry. (e) Granite porphyry. (f) Quartz–calcite veins with scattered, disseminated sulfides (pyrite and chalcopyrite) developed in the granite porphyry. (g) Irregular contact line between granite porphyry and skarn ore body. Quartz–sulfide veinlets developed in the granite porphyry, whereas large amounts of quartz–calcite veins and disseminated metal sulfides (pyrite and chalcopyrite) developed in the skarn ore body. (h) Skarn ore body with large amounts of veined and disseminated metal sulfides (pyrite and chalcopyrite). (i) Fault-fracture zone at the floor of the skarn ore body. The upper and lower plates are skarn ore body and fault fracture zone, respectively. The zone’s in-fill materials are tectonic cataclastic rocks. (j) Skarn ore body with quartz veins and large amounts of veined and disseminated metal sulfides (pyrite and chalcopyrite). (k) Fault–fracture zone between the skarn ore body and skarn. The upper and lower plates are the skarn ore body and the skarn, respectively. The zone’s in-fill materials are tectonic cataclastic rocks. (l) Garnet skarn. (m) Actinolite skarn. (n) Skarn ore body with large amounts of disseminated pyrrhotite, pyrite, chalcopyrite, and other metal sulfides. (o) Irregular contact line between skarn ore body and sericitic sandy slate.

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