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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
61

The development of fractures in the mesozoic volcanic rocks adjacent to the Sierrita porphyry copper deposit, Pima County, Arizona

Thompson, Randolph Charles January 1981 (has links)
No description available.
62

The geology of the Northwest orebody, Twin Buttes Mine, Pima County, Arizona

Rauschkolb, Michael Howard January 1983 (has links)
The Northwest orebody, located in Pima County, Arizona, is a large tonnage skarn containing copper, silver, and molybdenum mineralization. The orebody is separated from the main orebodies of the Twin Buttes mine by the Twin Buttes fault. Sulfide mineralization and silicate alteration are systematically zoned along a westerly trend away from the fault and from a central intrusive complex. Original host rock chemistry was the major control on the silicate and sulfide mineralogy of the skarns. The highest grade ore occurs in a garnet-diopside alteration zone within beds of altered limestone and dolomite. Lower grade ores formed in cal-silicated siltstones, quartzites, and granitic rocks. The skarns exhibit a complex history of sequential veining and replacement. The alteration can be subdivided into an early thermal event, followed by three stages of hydrothermal alteration. The first stage of hydrothermal alteration is characterized by the formation of anhydrous Ca-Mg-Fe-Al silicates, predominantly garnet and diopside. Stage II is a period of sulfide mineralization. The copper sulfides were deposited when copper in the hydrothermal solutions reacted with Fe⁺⁺⁺₋ rich garnet to form chalcopyrite. Mineralization continued during Stage III as increasingly pyritic sulfide mineralization was deposited with hydrous silicate minerals, predominantly epidote and actinolite. Several points of evidence show that the mineralization in the Northwest orebody is related to the intrusive activity at the center of the Twin Buttes mine area and not to either the pre-mineral Ruby Star Granodiorite or to a buried intrusive at depth.
63

A shallow seismic refraction survey over a late Quaternary fault scarp west of the Santa Rita Mountains, Arizona

Rutledge, James Thomas January 1984 (has links)
No description available.
64

STRUCTURE AND PETROGRAPHY OF THE EAST SIDE OF THE SIERRITA MOUNTAINS, PIMA COUNTY, ARIZONA

Lootens, Douglas J. January 1965 (has links)
No description available.
65

Geology and ore deposits of the Twin Buttes district

Brown, Ronald La Bern January 1926 (has links)
No description available.
66

Geology and ore deposits of the Rosemont area, Pima county, Arizona

Thomas, Walter L. January 1931 (has links)
No description available.
67

Geology and ore deposits of the Sunshine area, Pima County, Arizona

Higdon, Charles Eugene, 1908- January 1933 (has links)
No description available.
68

The geology of the California mine area, Pima County, Arizona

Gillingham, Thomas Elwood, 1912- January 1936 (has links)
No description available.
69

Stratigraphy and structure of the southwestern foothills of the Rincon Mountains, Pima County, Arizona

Layton, Donald Walter, 1927- January 1957 (has links)
No description available.
70

Geology of the Peach-Elgin copper deposit, Helvetia district, Arizona

Heyman, A. M. (Arthur Mark), 1929- January 1958 (has links)
No description available.

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