Porphyry alteration model

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August undefined, 2024

WebPorphyry systems represent the world's principal source of copper and molybdenum and are major repositories of gold and silver (Cooke et al., 2014a). These deposits originate from … WebJun 1, 2024 · Propylitic alteration of intrusive rocks (e.g., Sewell diorite, Teniente dacite porphyry) is typified by chlorite and epidote alteration of the ferromagnesian minerals, …

Porphyry Deposits » Geology Science

WebDec 15, 2024 · Porphyry systems include shallow intrusions (to 2-3 km depth) that have halos of biotite ± K-feldspar alteration; a lower temperature overprint of white mica ± chlorite alteration is common,... WebAlthough high-temperature (>600 °C), high-salinity fluids (>70 eq wt% NaCl) were recognized in the porphyry stock, the mineralization formed from much lower temperature (<250°C) and salinity (<13 eq wt% NaCl) fluids, leading Goellnicht et al. (1988) to present a model in which a magmatic system was overprinted by weakly developed epithermal … how are golf irons made

The Anatomy of an Alkalic Porphyry Cu-Au System: Geology and …

WebPorphyry systems are universally typified by three main features: (1) presence of veins and veinlets forming stockworks, within which are disseminated sulphides of Fe, Cu, Mo, Pb and Zn, as well as native Au, and minerals of W, Bi and Sn; (2) the mineralisation is spatially and genetically related to intrusive bodies, of which at least one has a … WebApr 28, 2024 · The propylitic alteration model, characterized by the presence of epidote and chlorite, displays a significant correlation with both post-mineral dykes and with one of … Webporphyry Cu (type 17) otherwise, where gold is in parts per million and molybdenum is in percent. Here deposits with no reported molybdenum grade and with a Au grade greater than 0.2 g/t were classed as porphyry Cu-Au, whereas those with no gold grade reported, but with a Mo grade greater than 0.03 were classed as porphyry Cu-Mo types. how are golf world rankings calculated

GEOLOGICAL MODELS IN EPITHERMAL-PORPHYRY …

Porphyry Copper Deposit Model - USGS

WebFeb 2, 2024 · Comparing the geophysical models with the host lithologies indicated that the inner part of the primary quartz diorite porphyry as the host rock dominantly has potassic alteration, with lower Cu–Au grades, higher magnetic susceptibility, and lower resistivity. WebAug 20, 2024 · Porphyry alteration (with porphyry as the center) changed from the proximal potassic zone (hydrothermal biotite + quartz + K-feldspar) to the middle phyllic zone (quartz + sericite + phengite) and then the peripheral propylitic zone (chlorite + epidote + calcite + quartz). ... “Polycentric complex mineralization model of porphyry system: a ... how are golf world rankings determinedWebGeneralized Porphyry Copper Model –Anatomy and Alteration Zoning Anatomy of Calc-alkalic Porphyry Copper and Related Mineralization Alteration Zonation Patterns in Calc … how many mb go into gb

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Porphyry alteration model

Lateral and vertical alteration-mineralization zoning in porphyry …

WebSep 13, 2013 · Staged model for porphyry Cu-Au development – exploration implications Pacrim 2024, Auckland, New Zealand Controls to Tasmanide epithermal-porphyry Au-Cu Mineralisation – Exploration Implications Mines and Wines Conference, Orange, September 2024 Australian Institute of Geoscientists Bulletin 67 Pacific rim epithermal Au 2013 Webcurrent model for staged porphyry development illustrated in figure 3. • Emplacement of the porphyry intrusion, commonly as an apophysis to a larger underlying magmatic source, …

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Web2.2.3 Fluid pathways. In the porphyry-epithermal mineral system, pathways for fluids and their contained metals, ligands and sulfur include faults, stratigraphic aquifers and crystallising intrusive bodies. Crystallising … WebPorphyry deposits are a type of mineral deposit that form from large-scale hydrothermal systems associated with intrusive igneous rocks. They are characterized by the presence of porphyritic rocks that contain large …

WebVolcanogenic Massive Sulfide Occurrence Model Scientific Investigations Report 2010–5070–C U.S. Department of the Interior ... Alteration textures range from weak alteration of only some of the minerals or matrix in the host rocks, producing ... Mont. and at several porphyry copper deposits (Sales and Meyer, 1948; Titley and Hicks, 1966 ... WebThe potassic alteration zone also contains sulfide minerals and is characterized in IP data with moderate to high-chargeability values. The IP method is the most extensively used geophysical approach in exploration of porphyry deposits. Magnetic minerals are enriched and destroyed respectively in potassic and phyllic alteration zones.

WebFigure 1. Staged model for porphyry development (from Corbett, 2024). The exploration implications of the understanding and application of this staged model for porphyry Cu-Au development lie in the use of vectors within wall rocks towards blind porphyry deposits and the interplay between mineralised and barren events. WebAlteration Strong alteration zones develop in and around granitic rocks with related porphyry deposits. Often there is early development of a wide area of secondary biotite that gives the rock a distinctive brownish colour. Ideally, …

WebChapter B of Mineral Deposit Models for Resource Assessment. This report contains a revised descriptive model of porphyry copper deposits (PCDs), the world’s largest source (about 60 percent) and resource (about 65 percent) of copper and a major source of …

WebCopper and molybdenum deposits, potassic, phyllic, argillic, and propylitic alteration, emphasis on San Manuel-Kalamazoo deposit of Arizona, tabulated data on characteristics of North and South American deposits This content is PDF only. Please click on the PDF icon to access. First Page Preview how are golf rankings calculatedWebGeneralized Porphyry Copper Model –Anatomy and Alteration Zoning Anatomy of Calc-alkalic Porphyry Copper and Related Mineralization Alteration Zonation Patterns in Calc-alkalic Porphyry Systems Modified from: Sillitoe, 2010, Porphyry Copper Systems: Economic Geology, v. 105 p. 3-41. how are goods and services producedWebApr 15, 2024 · The magmatic process within upper crust encompasses various contents such as the transition between magmatic and hydrothermal systems and changes in oxygen fugacity (ƒO2), which ultimately play key roles in the formation of porphyry Cu deposits (PCDs). However, tracing these magmatic processes, especially in porphyry systems, is … how are goods identifiedWebDec 14, 2024 · In this study, an RS alteration zoning model is established based on ground-spectral alteration zoning results. The methods include PCA (Principal Component … how are golf shoes madeWebJan 16, 2024 · Mineralization is hosted within Porphyry X, a crowded plagioclase porphyry of Cretaceous age (85.1Ma +- 1.1Ma), characterized by well-defined stacked biotite, a feature typical of mineral-related ... how are goods manufactured in italyWebWALLROCK ALTERATION: Fine-grained hydrothermal biotite and biotite as stable phenocrysts are common in diorite porphyry and associated intrusive phases. In some deposits sericitic alteration is pervasive in and adjacent to the ore zone with potassic alteration at depth (biotite). how are good welds made in metals how many mb in a g