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1. Most porphyry copper deposits show similar patterns of lateral zoning involving sulfides and silicate alteration assemblages. A central zone of biotite-orthoclase alteration is surrounded by a halo of quartz-sericite alteration, sometimes with an outer propylitic halo. 2. Hypogene sulfides are also zoned, from a central low pyrite/chalcopyrite ratio zone to a peripheral high pyrite/chalcopyrite halo that grades to lower sulfides. The highest copper occurs in the biotite-orthoclase zone or its borders w

Author

Berthing Herrera

Language

EN