Porphyry (geology) - Wikipedia
Porphyry (/ ˈ p ɔːr f ə r i / 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.
Porphyry Deposits - Geology Science
2023年4月23日 · Porphyry deposits are a type of mineral deposit that form from large-scale hydrothermal systems associated with intrusive igneous rocks. They are characterized by the presence of porphyritic rocks that contain large crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass).
What Is Porphyry? How Does It Form, and In Which Rocks? - Geology …
2022年9月2日 · Porphyry (pronounced as POR-fə-ree) describes any intrusive or extrusive igneous texture rock with large-grained crystals embedded in a finer-grain matrix. The finer-grained groundmass or matrix can be aphanitic or phaneritic. However, the larger crystals must be easily noticed and distinguishable.
Porphyry (geology) - New World Encyclopedia
Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic [1] matrix or groundmass. The larger crystals are called phenocrysts. In its traditional, non-geologic use, the term "porphyry" refers to the purple-red form of this stone, valued for its appearance.
Porphyry DepositsCharacteristics and Origin of Hypogene …
2005年1月1日 · Porphyry deposits arguably represent the most economically important class of nonferrous metallic mineral resources. These magmatic-hydrothermal deposits are characterized by sulfide and oxide ore minerals in vein-lets and disseminations in large volumes of hydrothermally altered rock (up to 4 km 3 ).
This field-oriented article reviews the geology of porphyry Cu systems at regional, district, and deposit scales. The resul-tant geologic model is then used as the basis for a brief syn-thesis of porphyry Cu genesis and discussion of exploration guidelines. The …
Porphyry copper deposit - Wikipedia
Porphyry copper deposits are copper ore bodies that are formed from hydrothermal fluids that originate from a voluminous magma chamber several kilometers below the deposit itself. Predating or associated with those fluids are vertical dikes of porphyritic intrusive rocks from which this deposit type derives its name.
Porphyry Copper Systems1 | Economic Geology
2010年1月1日 · Porphyry Cu systems host some of the most widely distributed mineralization types at convergent plate boundaries, including porphyry deposits centered on intrusions; skarn, carbonate-replacement, and sediment-hosted Au deposits in increasingly peripheral locations; and superjacent high- and intermediate-sulfidation epithermal deposits.
Porphyry deposits and oxidized magmas - ScienceDirect
2015年3月1日 · Porphyry Cu– (Mo)– (Au) deposits are essentially magmatic–hydrothermal systems, which are generally initiated by injection of oxidized magmas saturated with metal-rich aqueous fluids, i.e., the parental magmas need to be water rich and oxidized with most of the sulfur appearing as sulfate in the magma.
Porphyry copper formation driven by water-fluxed crustal
2024年11月4日 · We show that the isotopic signatures of Laramide granitic rocks are consistent with a Proterozoic crustal source that was potentially pre-enriched in copper. This source underwent water-fluxed...