Porphyry (/ ˈpɔːrfəri / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate -rich, generally aphanitic matrix or groundmass.

2021年9月7日 · The map layers comprise bedrock geology, distribution and intensity of alteration mineralogy and assemblages, illite crystallinity, porphyry alteration footprints from trace element patterns ...

While porphyry and high sulphidation epithermal Au + Cu + Ag deposits dominate within magmatic arcs, low sulphidation deposits display variations from more intrusion-related styles within the arc, intra arc rifts host carbonate-base metal Au (in the SW Pacific) and polymetallic Ag-Au vein (in the Americas) mineralisation, and chalcedony-ginguro ...

Adakite-like rocks, as an important recorder of magmatic evolution in mantle and crust, are closely associated with major porphyry Cu deposits. However, the underlying mechanism connecting these associations remains insufficiently elucidated.

associated granitoids and wall rocks. Porphyry 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 ...

2023年7月23日 · Porphyry copper ore-forming intrusions are distinguished from barren arc magmas by high oxidation state and “adakitic” high Sr/Y and La/Yb. Controversy over petrogenesis of adakites has centered on ambiguities in interpretation of their steep rare earth element (REE) patterns, and on whether garnet participates in their petrogenesis.

Generalized cross section of the alteration-mineralization zoning pattern for telescoped porphyry-Cu deposits, based upon the geologic and deposit type-template. Note that shallow alteration-mineralization types consistently overprint deeper ones. Volumes of the different alteration types vary markedly from deposit to deposit.

Identifying hydrothermal zoning pattern associated with porphyry copper deposit is important for indicating its economic potential. Traditional approaches like systematic sampling and conventional geological mapping are time-consuming and labor extensive, and with limitations for providing small scale information.

2012年11月15日 · Porphyry-type ore deposits are major resources of copper and gold, precipitated from fluids expelled by crustal magma chambers. The metals are typically concentrated in confined ore shells within vertically extensive vein networks, formed through hydraulic fracturing of rock by ascending fluids.

2015年5月11日 · Porphyry copper deposits are emplaced at a depth of about 2 km in convergent tectonic settings; their exposure at the surface therefore can be used to track landscape exhumation. Here we...