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The Style and Progress of Mineralization 8 General Features and Origin of Skarns
Grades and Tonnages of Porphyry
Geologic Setting of Porphyry Copper
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abundant andesite Ariz Arizona assemblages biotite bornite breccia calcite carbonate chalcocite chalcopyrite chlorite Christmas composition copper mineralization Cretaceous dikes diopside drill Econ emplacement enrichment epidote fault feldspar Figure fluid Formation fractures garnet Geology grains granite granodiorite hematite hornblende host rocks hydrothermal hypogene igneous rocks intrusive K-feldspar Laramide leached limestone magma magnetite Mesozoic mining district molybdenum Mountains occur orebody orthoclase oxidation Paleozoic percent phenocrysts phyllic phyry Pima County Pinal plagioclase pluton porphyry copper deposits porphyry copper systems Precambrian propylitic pyrite quartz diorite quartz monzonite quartz monzonite porphyry quartzite ratio region Reserves rock types samples San Xavier Santa Rita schist sedimentary rocks sericite Sierrita Sierrita Mountains silicate Silver Bell skarn southeastern Arizona Southwest Southwestern North America structural sulfide minerals sulfur supergene tectonic temperatures tion Titley Tucson Twin Buttes U.S. Geol Univ veinlets veins volcanic rocks wall rocks zone