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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.
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Showing 41 to 50 of 412 (0.047 seconds)Spelling suggestions: "subject:"pisa"" "subject:"pim""
| 41 |
Oxidation-leaching, and enrichment zones of a porphyry copper deposit: a mineralogic and quantitative chemical studyKoenig, Brian A. January 1978 (has links)
No description available.
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| 42 |
The geology and ore deposits of the Cuprite mining districtLee, Charles Albert, 1908- January 1935 (has links)
No description available.
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| 43 |
The geology of the Mam-A-Gah picnic area, Tucson Mountains, Pima County, ArizonaHorton, John William, 1932- January 1966 (has links)
No description available.
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| 44 |
The geology of the Esperanza Mine and vicinity, Pima County, ArizonaLynch, Dean W. January 1967 (has links)
No description available.
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| 45 |
Historical demography of the Pima and Maricopa Indians of Arizona (USA), 1846-1974Meister, Cary Walter. January 1990 (has links)
Thesis (Ph. D.)--University of Michigan, 1975. / Includes bibliographical references.
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| 46 |
Geochemical investigation of the Del Bac Hills volcanics, Pima County, ArizonaPercious, Judith K., Percious, Judith K. January 1968 (has links)
The Del Bac Hills are a northeast-trending chain composed of mid-Tertiary Turkey Track porphyry dikes and flows, overlain by potassic basaltic andesites intercalated with sediments. These hills are considered the southernmost extension of the Tucson Mountains and lie along a northeast-trending basement scarp which extends across the Tucson Basin. Turkey Track porphyry intrudes the San Xavier conglomerate as two parallel dikes, closely associated in time but with different magnetic orientations. Potassium-argon dating of a flow associated with the older dike yielded a mean of 26.8 m.y. for plagioclase phenocrysts and groundmass. Plagioclase of the younger dike sampled 50 feet from the contact with the San Xavier conglomerate and at a depth of approximately 200 feet yielded an anomalous age of 46.4 m.y., representing 0.29 x 10^-10 moles per gram excess Ar4° in comparison with the extrusive. The 21 basaltic andesite flows are essentially contemporaneous at 24-25 m.y. Tight grouping of K/Rb and Rb/Sr for the basaltic andesites confirms the field inference of two separate sources. Specific gravity and initial Sr^87/Sr^86 determinations for the porphyry and basaltic andesites do not preclude a comagmatic origin for the two rock types. Post-extrusive faulting along three principal directions has established the present configuration of the hills.
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| 47 |
Geology of the Mary G Mine area, Pima County, ArizonaDavis, Robert Ellis, 1924- January 1955 (has links)
No description available.
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| 48 |
The geology of the Twin Peaks area, Pima County, ArizonaBritt, Terence LeGrand, 1931- January 1955 (has links)
No description available.
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| 49 |
Geology of the Cerro Colorado Mining District, Pima County, ArizonaJones, Richard David, 1933- January 1957 (has links)
No description available.
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| 50 |
The geology of the Union Hill area, Silver Bell district, Pima County, ArizonaMerz, Joy Jonathan, 1935- January 1967 (has links)
No description available.
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