Porphyry alteration model
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. WebMay 1, 2024 · Propylitic alteration, particularly within relatively low permeability rocks, is fracture-controlled and a hierarchy of veins is observed. Veins of chlorite-quartz-pyrite ± …
Porphyry alteration model
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Webdispersed magmatic-hydrothermal alteration and mineralization. Porphyry copper deposits are large (commonly hundreds to thousands of million tonnes) and low to medium in grade (0.3 to 1.5% copper). The majority of gold-rich porphyry deposits occur in the circum-Pacific and commonly contain 0.3 to 1.6 g/t gold. 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 …
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 ... 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 …
WebJun 11, 2014 · Model for a Chilean type (Atacama Desert) giant porphyry copper deposit with a well developed supergene enrichment blanket (pale green) overlying a broad core of magnetite-destructive phyllic, advanced argillic and sericite–chlorite alteration (yellow), and a relict body of early biotite–magnetite alteration that has escaped strong phyllic ... 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,...
WebStaged model for porphyry development (from Corbett, 2024). ... from overprinting events of porphyry intrusion, alteration and mineralisation are better interpreted in a context of time. 2 EMPLACEMENT AND PROGRADE ALTERATION AND MINERALISATION Changes in the tectonic conditions, evidenced by vein kinematics, may act as triggers to initiate the ...
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. hope physical education coreWebOct 21, 2024 · Here is another picture frequently used to show copper porphyry model. On the left, the model shows the three alteration zones (propylitic, phyllic, and potassic) along with the ore body. On the ... hope photosWebGeneralized 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. long sleeve gray formal dressWebCopper 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 long sleeve great gatsby dresses macy\u0027sWebPorphyry 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 … hope photoWebOct 12, 2012 · Potassic alteration is often formed in the neighbor of intrusion porphyry showing intense potassium feldspar + quartz veins (matrix or groundmass) and consists mainly of secondary biotite, anhydrite, and magnetite associated with chalcopyrite, bornite, and/or minor molybdenite intergrowth with quartz. long sleeve graphic t-shirts for womenWebApr 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 … long sleeve gray cropped sweater zipper