Figure F116. Close-up of porphyroblastic mudrock affected by sill intrusion near the base of Subunit 5C. The porphyroblasts are composed of quartz, albite, alkali feldspar, and magnesian chlorite based on XRD analysis. An original burrow sedimentary texture is recognizable, overprinted by thermal effects (contact metamorphism or hydrothermal alteration) (Subunit 5C: interval 210-1276A-98R-3, 5-14 cm).

Figure F116. Close-up of porphyroblastic mudrock affected by sill intrusion near the base of Subunit 5C. The porphyroblasts are composed of quartz, albite, alkali feldspar, and magnesian chlorite based on XRD analysis. An original burrow sedimentary texture is recognizable, overprinted by thermal effects (contact metamorphism or hydrothermal alteration) (Subunit 5C: interval 210-1276A-98R-3, 5-14 cm).