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    Geology of the Palo Verde Ranch Area, Owl Head Mining District, Pinal County, Arizona

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    Author
    Applebaum, Steven
    Issue Date
    1975
    Keywords
    alteration
    andesites
    Arizona
    bornite
    carbonates
    Cenozoic
    chalcocite
    chalcopyrite
    chemical composition
    Chief Buttes
    chrysocolla
    clay minerals
    composition
    copper
    diabase
    diorites
    distribution
    granites
    granoaplite
    igneous rocks
    intrusions
    lava flows
    malachite
    metals
    mineral composition
    mineralization
    occurrence
    Owl Head Buttes
    Owl Head District
    Palo Verde Ranch
    petrology
    Pinal County Arizona
    Pinal Schist
    plutonic rocks
    quartz diorites
    sheet silicates
    silicates
    sulfides
    Tertiary
    United States
    volcanic
    volcanic rocks
    Geology -- Arizona -- Pinal County
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    Committee Chair
    Guilbert, John M.
    
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the Antevs Library, Department of Geosciences, and the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author or the department.
    Collection Information
    This item is part of the Geosciences Theses collection. It was digitized from a physical copy provided by the Antevs Library, Department of Geosciences, University of Arizona. For more information about items in this collection, please email the Antevs Library, antevs@geo.arizona.edu.
    Abstract
    A quartz diorite intrusion of probable early Tertiary age that crops out over at least 6 square miles in the Palo Verde Ranch area in Pinal County, Arizona was mapped as a distinct intrusion. The quartz diorite intrudes an area comprising Pinal Schist, Oracle granite, andesitic flows, granoaplite, and dike rocks including both pegmatite and diabase. Two major physical features, the Owl Head Buttes and Chief Buttes volcanic areas, both remnants of an extensive early Tertiary series of flows of intermediate composition that covered the area, now remain as lava-capped buttes above the pediment. Weak but persistent fracture-controlled copper mineralization is found in the quartz diorite and the Pinal Schist at or near their mutual contacts in the form of chrysocolla, malachite, black copper oxides, chalcocite, chalcopyrite, and bornite, in decreasing order. Pyrite is rare. Alteration related to northeast and northwest-trending fractures increases in intensity from the common propylitic to argillic to the northeast toward the San Juan claims area. A barely discernible increase in copper sulfides mirrors the alteration zoning, although geochemical sampling showed background copper in the quartz diorite to be more uniform away from fractures.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Geosciences
    Degree Grantor
    University of Arizona
    Collections
    Geosciences Theses
    Master's Theses

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