(PDF) Deep porphyry veins at Cerro de Pasco, Peru: …
European Current Research On Fluid Inclusions (ECROFI-XXIII), Leeds - UK, 27 - 29 June, 2015, Extended Abstracts' Volume Deep porphyry veins at Cerro de Pasco, Peru: Constraints from mineral, fluid and silicate melt inclusions in hydrothermal quartz Bertrand Rottier1, Kalin Kouzmanov1, Markus Wälle2, Luís Fontboté1 1 Section of Earth and …
Geology and Ore Deposits of the Central Andes
Both paragenetic stages contain important gold mineralization. Wall-rock alteration consists of quartz, sericite, and pyrite, with envelopes of propylitic alteration. …
Reflected light microscopy images of gold in quartz veins …
Download scientific diagram | Reflected light microscopy images of gold in quartz veins from Mollehuaca and San Juan de Chorunga, Arequipa-Perú. (A) Free gold filling fractures in quartz-calcite ...
Geological settings of the Pataz-Parcoy district
In the Pataz-Parcoy district, current mining activity is focused on the mesothermal quartz-carbonate-sulfide veins hosted by the Pataz batholith. Total gold production yielded approximately 8 Moz with grades in the mined ore shoots varying between 7 and 15 g/t Au, and locally reaching up to 120 g/t Au. High-grade ore shoots …
Geological structure and genesis of quartz veins in the …
The data on the geological structure and petrography of host rocks of the Vein 2136 quartz deposit located in the eastern part of the Ufalei gneiss–amphibolite complex (the Southern Urals) are discussed. It is established that the deposit resulted from the metasomatic replacement of amphibolite by quartz. The following metasomatic …
San Rafael, Peru: geology and structure of the worlds …
Subvertical cassiterite–quartz–chlorite vein crosscutting early tour-maline–quartz veins on the 4,310-m level of the Ore Shoot. Note the intense chloritic haloes around the quartz veins in the lower central part of the photograph. The scale is in centimeters. h Late, barren quartz vein crosscutting the subvertical cassiterite–quartz–
Geologic and isotopic constraints on the age and origin of …
Semantic Scholar extracted view of "Geologic and isotopic constraints on the age and origin of auriferous quartz veins in the Parcoy mining district, Pataz, Peru" by A. Macfarlane et al. ... Gold production in the Pataz district, northern Peru, is derived from mesothermal veins hosted by the Pataz batholith and basement-hosted epithermal and ...
Intrusion, skarn and vein paragenesis of the Ferrobamba …
The Eocene-Oligocene Ferrobamba deposit in southern Peru is the largest deposit in the Las Bambas Porphyry Cluster, and is owned by Minera Las Bambas (62.5% MMG Limited). Mining ... Jahuapaylla and late quartz monzodiorite dikes. Vein-hosted and pocket-hosted molybdenite present overlapping ages. Geochronological, ©2017 Society of Economic ...
Characteristics and evolution of quartz-calcite-sulfide veins …
Previous studies have documented the ore mineralogy and the geochemical composition of quartz-calcite-sulfide veins in the Nazca-Ocoña belt. Native gold, gold …
Peruvian Minerals
Hübnerite from Pasto Bueno district in northern Peru is a vein system that is tungsten rich. The very dark vitreous tabular hübnerite crystals are intergrown with clear quartz, making comb texture open …
Trace element composition of quartz from porphyry …
Quartz chemical compositions were compiled from different studies (Table 1) and each analyzed quartz was assigned a type based on the following criteria.The banded-type quartz are from banded porphyry veins which are abundant in shallow gold-rich porphyry deposits (Muntean and Einaudi 2000 and 2001; Koděra et al. 2014; Rottier …
How do quartz veins form?
Quarz veins come in different sizes - starting from milimetre scale ending with several meters (if not more). Quartz veins form from aqueous solution and in most cases that is associated with high hydraulic pressure (be that because of deformation or volcanic fluids).
Anatomy of Porphyry-Related Mineralised Au-Cu-Ag-Mo …
Chile-Peru or the Kidston Au breccia pipe. In the latter case geological mapping and gravity ... quartz-sulphide veins which may exploit dilatant fracture systems and migrate significant distances into the wall rocks, and are termed wall rock porphyry systems. For instance the
Geological settings of the Pataz-Parcoy district
In the Pataz-Parcoy district, current mining activity is focused on the mesothermal quartz-carbonate-sulfide veins hosted by the Pataz batholith. Total gold production yielded approximately 8 Moz with grades …
5.1" Pyrite, Sphalerite and Quartz Crystal Association
6.55" Gleaming Striated Pyrite Crystals with Quartz - Peru $75 5.1" Pyrite, Sphalerite and Quartz Crystal Association - Peru ... just as ice gradually forms when water freezes. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountain formation: these veins can be hundreds of millions of years ...
Zoned Base Metal Mineralization in a Porphyry System: …
fluid inclusions trapped in a milky quartz vein predating Cordilleran polymetallic mineralization, with similar low salinities ... (Peru Copper Inc., 2006), is the only known
Conolly contour diagrams and structural analysis of huebnerite-quartz
The veins are emplaced in Carboniferous (meta-Ishale, (meta-Ntstone and (meta-Isandstone. Cordierite-andalusite-biotite bearing hornfels occurs near the Permian biotite granite A three-dimensional ...
Formation of Cu–Au porphyry deposits: hydraulic quartz …
accumulated on the formation of hydraulic quartz veins, particularly as applied to mineral deposits, e.g. Kerrich and Allison (1978) on the Yellowknife gold mine in Canada, and then Cox et al.(1987), Ridley (1993), Sibson (1987) and Vearncombe (1988). Important controls on vein formation include rock properties, relative orientations of rock units
Hydrothermal Vein Deposits
Casseterite, wolframite and molybdenum veins; gold-quartz veins; copper-tourmaline veins; and lead-tourmaline veins provide examples of mineral associations which may occur in hypothermal deposits. Minerals which are found in hypothermal veins include quartz, fluorite, tourmaline, and topaz.
Porphyry style quartz veins; (a) typical porphyry quartz-Mo vein …
Download scientific diagram | Porphyry style quartz veins; (a) typical porphyry quartz-Mo vein exhibits fine laminated texture, and disseminated molybdenite on margins and quartz layers, (b ...
San Rafael, Peru: geology and structure of the worlds
The tin mineralization occurs mainly as cassiterite–quartz–chlorite veins and as cassiterite in breccias. The bulk of it is hosted by a K-feldspar megacrystic, biotite- …
Geologic setting, paragenesis, and physicochemistry of gold quartz
This is the most important intrusive body of the region and consists of a geochemically varied calc-alkaline magma suite.The Pataz batholith hosts numerous auriferous quartz veins with a simple two-stage sulfide paragenesis.
Zoned Base Metal Mineralization in a Porphyry System: …
Copper (5,000-18,000 mu g/g), sulfur (up to 12,000 mu g/g), and iron (2,100-6,000 mu g/g) concentrations in the intermediate-density fluid inclusions in the milky quartz veins are approximately 5 ...
Zoned Base Metal Mineralization in a Porphyry System: …
They are similar to intermediate-density fluid inclusions trapped in a milky quartz vein predating Cordilleran polymetallic mineralization, with similar low salinities (3.0–3.8 wt % NaCl equiv) and low CO 2 contents (6.5–8 mol %), but higher T h of ~420° to 410°C. During cooling of the intermediate-density fluids from 400° to 300°C, the ...
Vein Paragenesis, Breccia Stages, Structural Geology, …
Vein Paragenesis, Breccia Stages, Structural Geology, and Volcanic Stratigraphy of the Animas Vein, Caylloma District, Peru . Carlos A. Vargas,1,* William X. Chavez, Jr.,1 Andrew R. Campbell,1 and Thomas Vehrs2 1New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 . 2Fortuna Silver Mines, Inc *Corresponding …
Vein textures: (a) Polished slab photograph of porphyry-type …
Cordilleran polymetallic mineralization formed during three main paragenetic stages. The first stage is characterized by barren quartz-pyrite veins with sericitic alteration halos (Figs. 3b-d, 5).
Characteristics and evolution of quartz-calcite-sulfide veins …
DOI: 10.1016/j.oregeorev.2024.105895 Corpus ID: 267087671; Characteristics and evolution of quartz-calcite-sulfide veins in the Nazca-Ocoña belt, Perús …
Mineral Zoning and Geochemistry of Epithermal
These values are similar to those obtained for fluid inclusions in quartz and sphalerite from the second-stage ores (187°–293°C and 0.2–5.2 wt % NaCl equiv in the …
(PDF) Tourmaline-quartz-cassiterite mineralization of the …
The first episode comprises steeply dipping ENE-WSW striking tourmaline ± quartz veins precipitated from magmatic-hydrothermal fluids during regional NNW-SSE extension; they are not associated ...
Textures of auriferous quartz-sulfide veins and 40Ar/39Ar …
Internal textures of quartz veins and paragenetic sequence of hydrothermal minerals. Based on the strike and dip of the quartz veins, internal textures and cross-cutting relationships, both high-angle shear veins and low-angle extension veins are identified in the Rushan gold deposit. 4.1. High-angle shear veins