Porphyry alteration model
Porphyry copper deposits represent an important resource and the dominant source of copper that is mined today to satisfy global demand. Via compilation of geological data, it has been found that the majority of porphyry deposits are Phanerozoic in age and were emplaced at depths of approximately 1 to 6 kilometres with vertical thicknesses on average of 2 kilometres. Throughout the Phanerozoic an estimated 125,895 porphyry copper deposits were formed; howe… WebJan 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 ...
Porphyry alteration model
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WebApr 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 …
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, … 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 …
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. WebEssential elements of this genetic model are (1) shallow emplacement of a usually complex series of porphyritic dikes or stocks in and above the cupola zone of a calc-alkaline batholith; (2) separation of magmatic fluids and simultaneous metasomatic introduction of copper, other metals, sulfur, and alkalies into both the porphyries and wall …
WebAbstract The root zone of a porphyry system is a specific region beneath a porphyry orebody that was a site of focused fluid flow, as evidenced by abundant quartz veins, …
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 … phoenix scale and food equipmentWebalteration in many porphyry systems ADVANCED ARGILLIC INTERMEDIATE ARGILLIC This is an intense alteration phase, often in the upper part of porphyry systems. It can also form … phoenix salons seal beachWebAlthough 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 … phoenix scarf growtopiaWebOct 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. phoenixsc among usWebPorphyry copper deposits are normally located in the basement beneath a comagmatic volcanic pile, which is transected by a column of hydrothermal alteration representing the upper parts of the porphyry copper system. This alteration consists of propylitic and argillic types with localized patches of silicification and advanced argillic alteration. ttrs and edshedWebVolcanogenic 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 ... phoenix scarboroughhttp://earthsci.org/mineral/mindep/phor_dep/por_dep.html ttrs app for windows