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1-16 Keith, S. B., Gest, D. E., DeWitt, E., Toll, N. W., and Everson, B. A., 1983, Metallic mineral districts and production in Arizona: Arizona Bureau of Geology and Mineral Technology, Bulletin 194, 58 p.
1-16 Keith, S. B., Gest, D. E., DeWitt, E., Toll, N. W., and Everson, B. A., 1983, Metallic mineral districts and production in Arizona: Arizona Bureau of Geology and Mineral Technology, Bulletin 194, 58 p.
ABS
Mineral districts presented herein and delineated on the enclosedmap were defined according to geological criteria.The principal goal was to arrange known metallic mineral occurrencesinto discreet metallogenic systems of similar age andstyle of mineralization. It Is strongly stressed that many of themetallic occurrences have poorly understood geological controlsand hence, many of the district boundaries will change asknowledge of both their deposits and geologic settings is improved.Nevertheless, this map initiates a geological approachto the subject of mine district definition and suggests that mineral districts are ultimately geological phenomena.
Districts are color-coded according to the commodity producedand the type of mineralization. Estimated ages ofmineralization have been determined from radiometric datingof mineralization or stratigraphic position (either directly datedisotopically or correlated with adjacent radiometrically datedstratigraphy). A question mark has been placed on the mapafter the age designation if there is uncertainty about themineralization age of the district.
Deposits with similar geology occur throughout the State, andsome attempts to assign designations based on geologic settingare incorporated, as shown in the legend. The porphyrycopper districts (1a) and stratabound volcanogenic massivesulfide districts (9) are assigned designations based entirely ongeologic setting. Other distinctions made on the basis of depositgeology include the subdivisions of designations (1)Copper-porphyry or stratabound; (6) Manganese-veins orstratabound; and (10) Uranium-breccia pipes, stratabound,or veins. It is also recognized that there is evidence of formationby hydrothermal epigenetic processes after sedimentationin many of the stratabound copper, manganese, anduranium districts.
Key words
Arizona. copper ores. economic geology. economics. gold ores. iron ores. lead-zinc deposits. metal ores. mines. mining. production. silver ores. United States. uranium ores.
1-16 Keith, S. B., Gest, D. E., DeWitt, E., Toll, N. W., and Everson, B. A., 1983, Metallic mineral districts and production in Arizona: Arizona Bureau of Geology and Mineral Technology, Bulletin 194, 58 p.
ABS
Mineral districts presented herein and delineated on the enclosedmap were defined according to geological criteria.The principal goal was to arrange known metallic mineral occurrencesinto discreet metallogenic systems of similar age andstyle of mineralization. It Is strongly stressed that many of themetallic occurrences have poorly understood geological controlsand hence, many of the district boundaries will change asknowledge of both their deposits and geologic settings is improved.Nevertheless, this map initiates a geological approachto the subject of mine district definition and suggests that mineral districts are ultimately geological phenomena.
Districts are color-coded according to the commodity producedand the type of mineralization. Estimated ages ofmineralization have been determined from radiometric datingof mineralization or stratigraphic position (either directly datedisotopically or correlated with adjacent radiometrically datedstratigraphy). A question mark has been placed on the mapafter the age designation if there is uncertainty about themineralization age of the district.
Deposits with similar geology occur throughout the State, andsome attempts to assign designations based on geologic settingare incorporated, as shown in the legend. The porphyrycopper districts (1a) and stratabound volcanogenic massivesulfide districts (9) are assigned designations based entirely ongeologic setting. Other distinctions made on the basis of depositgeology include the subdivisions of designations (1)Copper-porphyry or stratabound; (6) Manganese-veins orstratabound; and (10) Uranium-breccia pipes, stratabound,or veins. It is also recognized that there is evidence of formationby hydrothermal epigenetic processes after sedimentationin many of the stratabound copper, manganese, anduranium districts.
Key words
Arizona. copper ores. economic geology. economics. gold ores. iron ores. lead-zinc deposits. metal ores. mines. mining. production. silver ores. United States. uranium ores.
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