Porphyry alteration model

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WebApr 24, 2024 · Very thorough Terraspec ® alteration analyses, conducted by Caza Gold and using a database containing in excess of 4,500 rock-chip samples, has identified that the most intense hydrothermal alteration at Los Andes is related to an outcropping porphyry body with strongly pyritic breccia located peripheral to it (see Figure 1). 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

11. Hydrothermal Alteration - USGS

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 ... 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. northgate vehicle hire brent cross

Magnetic effects of hydrothermal alteration in porphyry copper …

WebWALLROCK 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). 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 … 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, … northgate vehicle hire coventry

GEOLOGICAL MODELS IN EPITHERMAL-PORPHYRY …

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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, … 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 … northgate vehicle hire leeds addressWebJan 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 ... northgate vehicle hire basildon

"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

Porphyry alteration model

Geophysical Data Inversion in a Gold-Rich Porphyry System: A

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, … WebDec 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 …

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WebDec 14, 2024 · RS is an effective method for porphyry copper mineral exploration and prospecting prediction. More specifically, the Advanced Spaceborne Thermal Emission … 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.

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 … WebHydrothermal alteration provides a key component to the identification of a deposit. Alteration usually is zoned from a core of potassic plus/minus silicic alteration outwards through phyllic to propylitic alteration. Argillic alteration may be irregular in shape and will overprint earlier hydrothermal alteration.

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 … 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 …

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…

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 ... northgate vehicle hire eghamWebGeneralized 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 to say eubacteriaWebFeb 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. how to say eudaimonicWebOct 12, 2012 · The alteration model was followed from the modified Lowell and Gilbert model. The porphyry is stockworked by quartz veins and by quartz magnetite veins. Vein … northgate vehicle hire vacanciesWebVolcanogenic 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 ... northgate vehicle hire broxburnWebUSGS how to say eunoia northgate venue