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Showing 1 to 20 of 73 for “"Porphyry."”.
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Porphyry, And the Platonic-Aristotelian Tradition
An attempt will be made to determine Porphyry's intellectual and philosophical versatility and to see how it unfolded in dealing with the inherited Greek tradition. We begin with a discussion of Porphyry's understanding of some Homeric and pre-Socratic themes. Then , in the second chapter, Plato's …
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Geochemical Constraints of Porphyry Cu Deposits-Forming Magmas in Sonora, Mexico
Porphyry Cu deposits (PCDs) represent the most significant source of economic-grade copper (Cu) on Earth (Sillitoe, 2010). PCD formation is intimately linked to the magmatic and tectonic evolution of convergent margins (Sillitoe, 2010). While the metallogenic characteristics of PCDs have been …
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General theory of cut-off grades as applied to porphyry copper-type deposits
Includes bibliographical references (pages 150-156).
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Reflectance spectroscopy as a remote sensing technique for the identification of porphyry copper deposits.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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Copper mineralization in the Coed-Y-Brenin Porphyry Copper Deposit, North Wales: Mineralogy and Textures
The Coed-Y-Brenin porphyry copper deposit represents the largest deposit (200 mt) of its kind within the UK. This study aims to further understand the mineralogy and textures of ore minerals within the Coed-Y-Brenin deposit. <br/><br/>The area consists of middle to upper Cambrian sediments, namely …
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Alteration and mineralization of the San Pedro porphyry, Cerro San Pedro, San Luis Potosí, Mexico
Includes bibliographical references.
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An integrated study of the Blue Hills porphyry and related units Quincy and Milton, Massachusetts,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1974.
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The Evolution of the Los Negritos Porphyry Copper Deposit, Coquimbo, Chile: Geological, Geochronological, Mineralogical and Geochemical Evidence
The Los Negritos porphyry copper deposit is located ~ 4 km to the northeast of Carmen de Andacollo Mine in the Chilean Cretaceous metallogenic belt. The mineralization is hosted in andesite of the Quebrada Marquesa Formation and a series of at least four early to intramineral porphyry intrusive …
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Distribution of Platinum Group Elements in the New Afton Alkalic Cu-Au Porphyry Deposit, Kamloops, British Columbia
New Afton is an alkalic Cu-Au porphyry deposit situated 10 km west of Kamloops, British Columbia, within the Quesnel island arc terrane, a Late Paleozoic to Mesozoic arc complex that occupies the eastern part of the Intermontane Belt of the Canadian Cordillera. Bulk rock and sulfide minerals from …
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Petrogenesis of hybrid porphyry pipes and evolution of alkaline magmas in the Kanabeam Igneous Complex, Southern Namibia
… phases a number of late stage, xenolith rich porphyry pipes were emplaced, exploiting contact zones between earlier plutons. Xenolith types include gabbro possibly derived from unexposed deeper parts of the KIC, syenites (more proximal components of the KIC), trachytes from an inferred …
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An evaluation of indicators of prospectivity and potential mapping of porphyry deposits in middle and southern British Columbia by a GIS study of regional geochemical and other geoscientific data.
… presents mineral potential maps for prospecting porphyry deposits at the regional scale. The study area covers certain geological units in southern and middle British Columbia (from 48°N to 56°N) that are known for hosting major porphyry deposits. Four main types of data were used in this …
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Geology of the Ajax East and Ajax West, silica-saturated alkalic copper-gold porphyry deposits, Kamloops, South-Central British Columbia
… and Ajax West deposits are two of a number of porphyry copper-gold deposits that are hosted by the silica-saturated alkaline Iron Mask batholith, in the southern part of Quesnellia. The northwesterly trending batholith is an Early Jurassic composite intrusion emplaced in the Nicola Group, a …
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Trace Elements and Sulfur Isotope Variations in Endowed and Non-Endowed Porphyry Systems of the Dawson Range Mineral Belt, Yukon Territory
… The study analyzed fifty-six samples from eight porphyry systems, classifying them into endowed deposits (Casino, Cash, Revenue, Carmacks, and Minto) and non-endowed occurrences (Kerr, Cyprus, and Cockfield). Trace element analysis shows that endowed zones have higher concentrations of Cu, Mo, …
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Architecture of the Silurian sedimentary cover sequence in the Cadia porphyry Au-Cu district, NSW, Australia : implications for post-mineral deformation
Alkalic porphyry style Au-Cu deposits of the Cadia district are associated with Late-Ordovician monzonite intrusions, which were emplaced during the final phase of Macquarie Arc magmatism at the end of the Benambran Orogeny. N-striking faults, including the curviplanar, northerly striking, …
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Metal- and alteration-zoning, and hydrothermal flow paths at the moderately-tilted, silica-saturated Mt. Milligan copper-gold alkalic porphyry deposit
… deposit is a tilted (~45°) Cu-Au alkalic porphyry located 155 km northwest of Prince George, B.C., Canada. It is the youngest of the BC alkalic porphyry deposits, all of which formed between 210 to 180 Ma in an extensive belt of K-enriched rocks related to the accretion of the …
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Reclaiming happiness of the city and the soul : Augustine's engagement with Cicero and Porphyry in the City of God.
… of the Christian teachings. Since Cicero and Porphyry were the major philosophers who taught a way to happiness on socio-political and contemplative levels respectively, Augustine presents the Christian faith as the single way to the true commonwealth and the beatific vision which these two …
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Geochemical Evolution at White Island, New Zealand
… of the environment associated with formation of porphyry copper deposits. White Island has only been active for about 10 Ka and, as such, is thought to be an ideal location to study early magmatic processes associated with formation of porphyry copper deposits. In this study, the geochemistry of …
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Early Laramide Magmatism in Southern Arizona U-Pb Geochronology of Key Igneous Units and Implications for the Timing of Regional Porphyry Copper Mineralization
… in the emplacement of numerous productive (porphyry copper) deposits, associated Ag-base metal deposits, and barren intrusive units. The timing of these events has been loosely constrained by early K-Ar ages and cross-cutting field relationships; in many districts early Laramide volcanic …
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