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The Global ETD Search service is a free service for researchers
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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 21 to 30 of 42 (0.05 seconds)Spelling suggestions: "subject:"eology -- mexico"" "subject:"eology -- lexico""
| 21 |
THE LA CIENEGA VEIN AND ITS GEOLOGICAL SETTING, DURANGO, MEXICO.Loera Fragozo, Francisco José . January 1982 (has links)
No description available.
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| 22 |
The geochemical environment of ore deposition in the Pachuca-Real del Monte district, Hidalgo, MexicoDreier, John Edward, 1942- January 1976 (has links)
No description available.
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| 23 |
Geology, alteration, and mineralization of the El Alacran area, northern Sonora, MexicoDean, Darrel Allen, 1943- January 1975 (has links)
El Alacran, northern Sonora, Mexico, is a high-level, Laramide porphyry copper deposit encompassing an
east-west elongated altered and mineralized area of 2.7 by 6 km. A small quartz latite porphyry plug forcefully intrudes comagmatic(?) Late Cretaceous or Early Tertiary andesitic to quartz latite volcaniclastic rocks.Veinlet-controlled and pervasive potassic, Type I phyllic, and transition type alteration with related base-metal mineralization postdates pervasive propylitic alteration and is related in space and time to the intrusive and its associated intrusion-breccia annulus. Potassic alteration is dated by K-Ar at 55.4 +- 1.2 m.y. Later pervasive and veinlet-controlled Type II phyllic and minor advanced argillic alteration is associated with intrusive breccia dikes and pipes which are genetically related to degassing of the system. Minor veinlet-controlled late-stage alteration followed. Hypogene zoning is exhibited by alteration, mineralization, total sulfide volume, mineralized fracture density, and geochemistry with zoning being centered over or to the east of the exposed intrusive. Supergene enrichment processes have modified hypogene sulfides, oxides, and silicates and have formed a
copper enriched blanket which underlies a leached cap. The blanket is characterized by a chalcocite zone which grades downward into a bornite-digenite-covellite zone and then into low-grade protore.
Although the enriched blanket appears to be subeconomic, this study indicates potential for a deep, high-grade protore zone.
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| 24 |
Geology of the footwall formations of the Veta Madre, Guanajuato Mining District, Guanajuato, MexicoCornelius, Kenneth Donald, 1926-, Cornelius, Kenneth Donald, 1926- January 1964 (has links)
No description available.
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| 25 |
GEOLOGY AND GENESIS OF THE GUADALUPE SILVER DEPOSIT, TAXCO MINING DISTRICT, GUERRERO, MEXICO.Osterman, Christopher. January 1984 (has links)
No description available.
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| 26 |
Geologic and economic study of ultramafic complexes of the coast of Guerrero, MexicoDelgado-Argote, Luis Alberto, 1953- January 1986 (has links)
No description available.
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| 27 |
Preliminary investigation and exploration in the Rancho El Rodeo area, Sonora, MexicoPotucek, Tony Lee, 1951- January 1978 (has links)
No description available.
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| 28 |
Geologic setting and silver mineralization in the Planchas de Plata area, northern Sonora, MexicoSegerstrom, Lawrence, 1954- January 1986 (has links)
No description available.
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| 29 |
Economic geology of the Alamos Mining District, Sonora, MexicoVazquez Perez, Adalberto, 1944- January 1975 (has links)
No description available.
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| 30 |
Analysis of subsidence and thermal history in the Sabinas Basin, northeasern MexicoCuevas Leree, Juan Antonio January 1985 (has links)
No description available.
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