. Transactions. Fig. 15. Fig. 16. Fig. 15.—Micro-pegmatite from a Dike in the East Mine, Firmeza. Fig. 16.—Acidic Dike, West Mine, Firmeza. Acid plagioclase with micro-pegmatitic quartz on the right. Fine-grained diorite, forming the wall rock on the left. gregate, reminding one of nothing so much as somewhat badly alteredtrachytes or bostonite dikes. Blotches of less definite igneous texturesappear as well and make the rock very puzzling for sharp the original diorite has been severely affected by thermal JAMES F. KEMP 19 waters, has lost its dark silicates and has chan
. Transactions. Fig. 15. Fig. 16. Fig. 15.—Micro-pegmatite from a Dike in the East Mine, Firmeza. Fig. 16.—Acidic Dike, West Mine, Firmeza. Acid plagioclase with micro-pegmatitic quartz on the right. Fine-grained diorite, forming the wall rock on the left. gregate, reminding one of nothing so much as somewhat badly alteredtrachytes or bostonite dikes. Blotches of less definite igneous texturesappear as well and make the rock very puzzling for sharp the original diorite has been severely affected by thermal JAMES F. KEMP 19 waters, has lost its dark silicates and has changed over to this feldspathicresidue. In the New El Norte mine of the Daiquiri group a light-coloredporphyritic dike with branches penetrates the ore in Cut 3 as illustrated. Fig. 17.—Ramifying Dike or Thin Sill of Dacite-Porphyry cutting the OreON Cut 3, New Norte Mine.
Size: 2337px × 1070px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
