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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.
Search results
Showing 1 to 8 of 8 (0.045 seconds)| 1 |
Trace element investigation of the "Turkey Track" porphyry, southeastern ArizonaMielke, James E. January 1965 (has links)
No description available.
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Geological-geochemical relationships between prophyry copper and porphyry molybdenum ore depositsLainé, R. (Roger), 1946- January 1974 (has links)
No description available.
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The structural and chemical evolution of phyllic alteration at North Silver Bell, Pima County, ArizonaPiekenbrock, Joseph Robert January 1983 (has links)
No description available.
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Physiochemical characteristics during potassic alteration of the porphyry copper deposit at Ajo, ArizonaUyTana, Veronica Feliciano January 1983 (has links)
Potassium metasomatism is a widespread alteration type in porphyry copper deposits and is often spatially associated with hypogene sulfide ore formation. At Ajo, potassic alteration composes the dominant alteration type and is spatially, and to some extent, temporally, associated with chalcopyrite and bornite mineralization. Physiochemical conditions prevailing during potassic alteration thus describe a significant portion of the hydrothermal ore-forming process. Studies of fractures, fluid inclusions in quartz, and structural and compositional characteristics of K-feldspar, all in the potassic alteration zone at Ajo, indicate that: fracturing was strongest during potassic alteration and sulfide deposition, pressure were at approximately 650 bars, temperatures started a a minimum of 580°C, continued through 470°C, log aK+/aH+ changed from 2.6 at 580°C to 3.2 at 470°C, log aNa/aH+ changed from 2.7 at 580°C to 3.8 at 470°C, and the ratio aK+/aNa+ radically decreased from 0.8 to 0.3 in this temperature range.
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FRACTURE STUDY OF A VOLCANIC LITHOCAP, RED MOUNTAIN PORPHYRY COPPER PROSPECT, SANTA CRUZ COUNTY, ARIZONA.Kistner, David John. January 1984 (has links)
No description available.
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The role of silicate mineral alteration in the supergene enrichment processMarozas, Dianne Catherine January 1983 (has links)
No description available.
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A determination of the sulfur isotopic signature of an ore-forming fluid from the Sierrita porphyry copper deposit Pima County, ArizonaTurner, Kent January 1983 (has links)
No description available.
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Geology and alteration-mineralization zoning of the Pine Flat porphyry copper occurrence, Yavapai County, ArizonaSpatz, David Moore. January 1974 (has links)
No description available.
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