WebMar 30, 2024 · Porphyry-type deposits are crucial reserves of Cu and Mo. They are associated with large haloes of hydrothermal alteration that host particular mineral assemblages. Portable X-ray fluorescence analysis (pXRF) is an increasingly common tool used by mineral prospectors to make judgments in the field during mapping or core … WebPorphyry deposits are characterized by disseminated, veinlet- and fracture-controlled copper-iron sulphide minerals distributed throughout a large volume of rock in association with potassium silicate, sericitic, propylitic and, less commonly, advanced argillic alteration in porphyritic plutons and in the immediate wall rocks.
Dacite - Wikipedia
WebJan 21, 2024 · PORPHYRY (Gr. Πορφύρεος, Lat. purpureus, purple), in petrology, a beautiful red volcanic rock which was much used by the Romans for ornamental purposes when cut and polished. The famous red porphyry ( porfido rosso antico) came from Egypt, but its beauty and decorative value were first recognized by the Romans in the time of the ... WebPorphyry copper deposits originate in or nearby porphyritic intrusives which were saturated by water as they intruded in shallow areas of the crust (less than 6 km depth). The developing hydrothermal systems are characterized by the interaction, to different degrees, of fluids coming directly from the parental intrusive and from meteoric ... high cystathionine levels
Porphyry Copper, Gold, Molybdenum, Tungsten, Tin, Silver
WebPorphyritic Sentence Examples. porphyritic. Meanings. Sentences. The rocks of its lower half are mainly granite and gneiss; its upper half is composed of porphyritic greenstone, and a variety of minerals occur. 0. 0. Few obsidians are entirely vitreous; usually they have small crystals of felspar, quartz, biotite or iron oxides, and when these ... WebSep 5, 2024 · porphyry. (n.). type of very hard stone made of crystals embedded in a homogeneous base, late 14c., porfurie, from Old French porfire, pourfire, from Italian porfiro and in some cases directly from Latin porphyrites, name given by the Romans to a purple stone used extensively for ornamental purposes and quarried near the Red Sea in Egypt, … 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 distinct porphyritic … high cylinder lenses