Porphyry alteration model
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, … WebOct 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 ...
Porphyry alteration model
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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 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 …
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 ... WebUSGS
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 … WebGeneralized Porphyry Copper Model –Anatomy and Alteration Zoning Anatomy of Calc-alkalic Porphyry Copper and Related Mineralization Alteration Zonation Patterns in Calc …
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.
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,... philly sales tax 2021WebVolcanogenic 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 ... philly sales tax calculatorWebAlthough 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 … philly rust beltWebPorphyry deposits are characterized by disseminated, veinlet- and fracture-controlled copper-iron sulphide minerals distributed throughout a large volume of rock in association … philly saints scoretsb warringtonWebApr 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 … tsb warehouseWebFigure 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. philly sandwich company hagerstown