Supergene Mineralogy and Processes in the San Xavier Mine Area-Pima County, Arizona

Persistent Link:
http://hdl.handle.net/10150/236074
Title:
Supergene Mineralogy and Processes in the San Xavier Mine Area-Pima County, Arizona
Author:
Arnold, L. Clark
Issue Date:
1964
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:
This is a study of the supergene mineralogy of the San Xavier West mine located in the Pima mining district, Pima County, Arizona. The number and composition of secondary species collected are found to be closely related to the relative amounts of the various primary minerals and to the manner in which they were emplaced in the host rock. Supergene mineral species were selected that appeared to be in equilibrium with their environment, and certain assumptions are made concerning the stability fields of these minerals. The equilibrium conditions in most cases can be narrowed and often closely defined by combining the stability fields of several secondary minerals. On this basis, two acid environments and one alkaline environment are found to exist and are separable on the basis of mineralogy. The fields of chalcanthite and melanterite define a highly acid environment while those of goslarite and malachite define an environment of lower acidity. The association of calcite, rosasite, hemimorphite, and malachite indicate an alkaline environment. The acidity of the environments is principally determined by the amount of pyrite present, and pH may be lower than 3 if pyrite is abundant and reactive carbonate material lacking. Also, knowledge of stability relations allowed the history of enrichment and subsequent oxidation to be followed in a case where a transitional species had been removed from reaction by inclusion with gypsum.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Arizona; economic geology; mineral deposits genesis; mineral resources; mineralization; Pima County Arizona; processes; San Xavier Mine; supergene processes; United States; Mineralogy -- Arizona -- Pima County
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Geology
Degree Grantor:
University of Arizona
Committee Chair:
Titley, Spencer R.

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