Porphyry alteration
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). WebJun 22, 2015 · The key to porphyry exploration is the alteration of the surrounding rocks that occurred during the intrusion and mineralization. The so-called prophylactic folic and potassic alterations I spoke about. …
Porphyry alteration
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WebThis is common in porphyry copper and porphyry molybdenum deposits. Argillic alteration, commonly present in the distal areas of porphyry deposits, is a low-temperature … WebOct 20, 2024 · Porphyry Alteration as an Exploration Tool: Advances in Field Applications - Research Exchange20th October 2024Hosts: Azam Soltani, Michael Calder and Aaron ...
Webpotassic alteration stage of a porphyry deposit plus the overlying lithocap of advanced argillic alteration; both alteration types have the same age. The potassic-stage brine is dense, but a low-salinity vapor rich in gases such as SO 2 and HCl is buoyant and ascend toward the surface, with a portion discharging as high-temperature volcanic ... WebJun 1, 2024 · A saponite–smectite–K-feldspar–anhydrite (gypsum) alteration assemblage is located mainly in the host quartz diorite porphyry, and is minor in the wall rocks of limestone and a post-mineralization diorite porphyry. A sericite–chlorite alteration assemblage was widely developed in the quartz diorite porphyry, and the intensity of ...
WebThese rocks form from the slow cooling of magma in the Earth’s crust and provide the setting for the formation of porphyry deposits. Hydrothermal Alteration Zones: Porphyry deposits are associated with hydrothermal … WebFeb 28, 2024 · The role of potassic alteration and associated quartz veins for porphyry Cu mineralization in two representative porphyry systems (El Salvador, Chile, and Grasberg, …
WebSep 19, 2015 · PDF Summary of the different alteration types found in Porphyry Copper deposits with detailed mineralogy and spectral signatures. Find, read and cite all the …
http://earthsci.org/mineral/mindep/phor_dep/por_dep.html christmas carol lyrics good king wenceslasWebThe most intense stockwork veining and alteration, and the highest Au and Cu grades occur immediately adjacent to the monzonite porphyry. The best part of the orebody occurs above the porphyry and the weaker parts along the sides. The intensity of veining and alteration declines both outwards and inwards from the monzonite porphyry margin. germany dialing code from south africaWebApr 1, 2024 · Our understanding of the origin of hydrothermal propylitic alteration assemblages in intrusion-centred magmatic-hydrothermal systems has changed little since the first geochemical and isotopic studies in the late 1970s and 1980s. Recently, the propylitic alteration haloes around porphyry-copper ore deposits have received increasing … christmas carol lyrics ukWebPorphyry-type mineral deposits result when large amounts of hot water that carry small amounts of metals pass through permeable rocks and deposit the metals. Alteration Strong alteration zones develop in and around … germany dialling codeWebApr 11, 2024 · Patrimonio is defined by highly anomalous sampling over a 1.5km long x 0.6km wide area where outcropping porphyritic diorite displays intense, pervasive biotite alteration and stockwork veining on ... germany dialing code from englandWebJun 1, 2024 · Chlorite alteration processes in porphyry deposits. Chlorite displays wide compositional variations that are related to the pressure, temperature and redox … christmas carol lyrics sheets free printableWebJul 25, 2024 · Potassic alteration as one of the essential alteration types in porphyry copper deposits, distributed mostly in the north of the Sonajeel prospect that determined by Thermal infrared bands processing. Phyllic and argillic alteration zones detected by creating relative absorption band-depth grids which are comparable to field observations. germany dictator