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Minerals | Free Full-Text | Mineralogical Study of the …
The Konos Hill prospect in NE Greece represents a telescoped Mo–Cu–Re–Au porphyry occurrence overprinted by deep-level high-sulfidation mineralization. Porphyry-style mineralization is exposed in the …
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11. Hydrothermal Alteration
the primary alteration minerals are transformed into predict-able higher temperature and pressure mineral assemblages (table 11–1) (Bonnet and Corriveau, 2007). Alteration in Modern Seafloor Volcanogenic Massive Sulfide Systems. Subseafloor VMS hydrothermal alteration zoning is less studied than equivalent systems on the continents because of
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International Journal of Speleology
rence of alunite in these silica stalactites, whilst unusual, is consistent with the normal silica stalactite-forming process in this region, and in ... In the context of caves and cave deposits, primary speleogenetic (formed within caves) alunite-group minerals have been found in the wall and floor ...
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USGS Publications Warehouse
Gallium is produced as a byproduct from bauxite and zinc sulfide ores and rarely from primary Ga ores. High Ga contents (>60 ppm) can occur in zones of advanced argillic alteration consisting of alunite+kaolinite+quartz associated with quartz-alunite (high sulfidation Au-Ag) deposits. In a magmatic-hydrothermal environment, the zones of …
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Phosphate-Bearing Minerals in Advanced Argillic Alteration …
Changing physico-chemical characteristics of the hydrothermal fluids with time resulted in zoning and multiphase formation of these alunite-type minerals, with a common late phase dominated by pure sulphate (alunite). This is the first detailed documentation of hydrothermal APS minerals in alteration systems of the Carpatho-Pannonian region.
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Hycroft Gold Mine (MRDS #10310408) AU, AG
Hycroft Resources acquired the Lewis mine in January 1987 and has since consolidated the two mines into the Crofoot/Lewis mine. This gold mine has been described in many earlier MRDS records: W700587, M242949, W700582, M242768, and M242743. The current record combines all information from the earlier records and supersedes those records.
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University of Nebraska
inclusion fluids in magmatic-hydrothermal and magmatic-steam alunite" (2005). Geochemistry of Sulfate Minerals: A Tribute to Robert O. Rye. 5. https://digitalcommons.unl.edu/usgsrye/5 This Article is brought to you for free and open access by the US Geological Survey at DigitalCommons@University of Nebraska - Lincoln.
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Jarosite and Alunite in Ancient Terrestrial Sedimentary Rocks
1. Introduction and Background. Examination of the Martian surface mineralogy over the last couple of decades has revealed the widespread occurrence of sulfate minerals (including abundant minerals from the alunite group) in a variety of geologic settings [1,2,3,4].Minerals from the alunite group first came to prominence with the …
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Backscattered electron image showing compositional (K-Na) …
Backscattered electron imaging on sections of alunite crystals from the Velence Mountains displays zoning due to the different content of Na replacing K in the alunite structure (Fig. 2).
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Extraction of Al and K salts from associated alunite …
The acid processing route of primary alunite has several distinct advantages over the alkali processing route: (1) an Al–Si separation process is not needed; (2) …
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Extraction of Al and K salts from associated alunite tailings by an
General flow sheet of this new process to treat associated alunite tailings and a traditional flow sheet to treat primary alunite (Ozdemir and Cetisli, 2005) are shown in Scheme 1 in comparison.Although the traditional process for primary alunite is simple due to its higher potassium content and easy separation of K 2 SO 4 from the crystalline …
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Characterization of gas chemistry and noble-gas isotope …
Primary fluid inclusions in the alunite typically are less than 0.2 Am but range up to several micrometers. Analyses of the active-gas composition of these alunite-
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Using hyperspectral imagery for identification of pyrophyllite
The formation of alunite-dominant hydrothermal alteration requires higher concentrations of H 2 SO 4 compared to pyrophyllite; accordingly, areas where magmatic-hydrothermal vapours have fluxed through for a protracted period will contain abundant alunite alteration (Einaudi et al., 2003, Hedenquist and Browne, 1989, Hedenquist and …
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Evaluation of argon ages and integrity of fluid-inclusion …
Three gas retention sites are recognized in alunite: (1) primary fluid inclusions, (2) crystal structure OH sites, and (3) crystal structure sulfate sites. Alunite undergoes OH loss at <500°C, and K-SO 4 structural decomposition occurs at >600°C. Fluid inclusions generally are ≤1 μm in diameter and have variable but high vapor/liquid ratios.
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(PDF) Geochemistry of alunite group minerals in …
Alunite supergroup minerals display a wide compositional range corresponding to members of the alunite, beudantite, and plumbogummite subgroups. Diaspore displays an almost stoichiometric …
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(PDF) Mineralogy and genesis of primary alunites from epithermal
The δ18O values for the sulfate site in the alunite structure are between 10.6 and 13.6‰ in both areas. High δ34S values can be attributed to S isotope fractionation during the high ...
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Chapter C: Hydrothermal Enrichment of Gallium in Zones of …
Gallium is produced as a byproduct from bauxite and zinc sulfide ores and rarely from primary Ga ores. High Ga contents (>60 ppm) can occur in zones of advanced argillic alteration consisting of alunite+kaolinite+quartz associated with quartz-alunite (high sulfidation Au-Ag) deposits. In a magmatic-hydrothermal environment, the zones of …
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The Pierina epithermal Au–Ag deposit, Ancash, Peru: paragenetic
Coarse-grained alunite, rare at Pierina, consists of crystals ∼3–15 mm in length that occur as monomineralic, buff to pale pink veins and coatings on breccia fragments (Fig. 7 e). Unlike the disseminated form, coarse-grained alunite does not replace primary minerals or inferred pumice fragments, but occurs as open-space fillings.
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Mineralogy and genesis of primary alunites from
The δ18O values for the sulfate site in the alunite structure are between 10.6 and 13.6› in both areas. ... deposits, primary (hypogene) alunite precipitates from fluids with significant
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(PDF) Mineralogy and genesis of primary alunites from epithermal
Mineralogy and genesis of primary alunites from epithermal systems of Hungary
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Aluminum (Al) Ore | Minerals, Occurrence » Geology …
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Characterization of gas chemistry and noble-gas isotope ratios of
Primary fluid inclusions in the alunite typically are less than 0.2 ??m but range up to several micrometers. Analyses of the active-gas composition of these alunite-hosted inclusion fluids released in vacuo by both crushing and heating indicate consistent differences in the compositions of magmatic-hydrothermal and magmatic-steam fluids. The ...
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Genesis of Fanshan lithocap, Luzong volcanic basin
Alunite is a common mineral in lithocaps, but its interpretation is complicated by its forming under different conditions: magmatic-hydrothermal, ... More importantly, the primary magma of the volcanic rocks in the Luzong basin was derived from the upper mantle (Yuan et al., 2008, Zhou et al., 2011).
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Alunite characterization in the upper Eocene clay deposits
Alunite mineral was recently identified at the upper Eocene clay deposits associated with laminated primary gypsum and iron oxide in Central Tunisia, particularly at El Gnater site. The alunite characterization has been performed by several analytical techniques [atomic absorption spectroscopy (AAS), X- ray diffraction (XRD), scanning …
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Alunitele: ce sunt, cand sunt periculoase, evaluare si tratament
Alunite dobandite. Alunitele dobandite sunt cele care apar fie in copilarie, fie la maturitate. Cele mai multe dintre ele nu prezinta niciun risc, insa uneori se pot transforma in alunite canceroase. Alunitele dobandite sunt cele mai comune si apar, in general, din cauza expunerii prelungite si repetate la soare. Alunite cu forme regulate
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Recovery of Soluble Potassium from Alunite by Thermal …
K, Al and S are the primary components in natural alunite, which can be used to produce K 2 SO 4, Al 2 O 3, Al 2 (SO 4) 3 and KAl(SO 4) 2. However, alunite is difficult to dissolve in water and ...
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Alunite Mine – Western Mining History
The Alunite Mine is a gold and potassium mine located in Clark county, Nevada. About the MRDS Data: All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. ... Primary: Alunite Mine. Commodity. Primary: Gold Primary: Potassium ...
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(PDF) Mineralogy and genesis of primary alunites from epithermal
The d18O values for the sulfate site in the alunite structure are between 10.6 and 13.6 in both areas. High d34S values can be attributed to S isotope fractionation during the high temperature magmatic-hydrothermal formation of alunite from the Velence Mountains, which did not occur during formation of low-temperature steam-heated alunites from ...
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(PDF) Comparative mineralogical and genetic studies on …
PDF | On Jan 1, 2001, Bajnóczi B. and others published Comparative mineralogical and genetic studies on primary alunite from epithermal systems of …
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Mineralogy and Genesis of Primary Alunit | PDF
Characteristics of primary alunite occurrences in Hungarian epithermal environments In the low sulfidation-type systems of the Tokaj Mountains alunite occurs in alteration zones developed mostly in Miocene rhyolite or mixed tuff and sub-ordinately in andesitic lava flows and rhyolite domes (Fig. 1, Table 1).
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