Distinguishing the Type of Ore-Forming Fluids in Gold
Pyrite geochemistry is crucial for the discrimination of the types of ore-forming fluids in gold deposits, such as metamorphic–hydrothermal fluids and magmatic–hydrothermal fluids. With the assistance of supervised machine learning algorithms, this application can be leveraged maximally. Here, laser ablation inductively coupled plasma mass spectrometry …
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Micromorphologies and sulfur isotopic compositions of …
Schematic diagram showing the distribution of pyrite in all four subtypes of sandstone-hosted U deposits (modified from Dahlkamp, 2009). …
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In-situ element geochemical and sulfur isotope signature of pyrite …
The Laoshankou deposit is an iron oxide-copper–gold (IOCG)-like deposit in the northern margin of East Junggar, Central Asian Orogenic Belt (CAOB), in which pyrite is ubiquitous and present from stage II magnetite mineralization (Py1a and Py1b), stage III-A pyrite mineralization (Py2a and Py2b), to s tage III-B chalcopyrite mineralization (Py3a and Py3b).
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Banded iron formations, pyritic black shale, and gold deposits : a …
In this thesis, black shales are investigated as the source of gold, arsenic, and tellurium at two BIF-hosted gold districts, Randalls (Australia) and Homestake (USA).
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Framboidal and spherulitic pyrite in sediment-hosted ore …
Pyrite in the form of framboids is one of the most common sulfides in many sediment-hosted ore deposits, especially in shale-hosted massive sulfide (SHMS) or clastic-dominated Zn-Pb (e.g., …
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Coupled Microstructural EBSD and LA-ICP-MS Trace Element
Electron backscatter diffraction (EBSD) methods are used to investigate the presence of microstructures in pyrite from the giant breccia-hosted Olympic Dam iron-oxide copper gold (IOCG) deposit, South Australia. Results include the first evidence for ductile deformation in pyrite from a brecciated deposit. Two stages of ductile behavior are observed, although extensive …
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Pyrite Re–Os and muscovite 40Ar/39Ar dating of the Beizhan iron …
The Beizhan magnetite deposit, with total iron ore reserves of 468 Mt at an average grade of 41% TFe, is the largest iron deposit in the AIMB. The orebodies of the Beizhan …
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Gold deposits hosted by banded iron formation
Gold deposits hosted by banded iron formation. Gold deposits hosted by banded iron formation. Recently Searched No results found ... The ore minerals are pyrite and to a lesser extent arsenopyrite, and the gold is in free milling form. The gold concentration, obtained by sampling a channel of length 1– 4 m, is 2.7–3.2 g/t (Härkönen I 24.8 ...
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A Hydrothermal Origin for the Jaspilite-Hosted, Giant Serra Norte Iron
PDF | On Jan 1, 2008, Rosaline C Figueiredo e Silva and others published A Hydrothermal Origin for the Jaspilite-Hosted, Giant Serra Norte Iron Ore Deposits in the Carajás Mineral Province, Pará ...
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(PDF) Invisible Gold Paragenesis and Geochemistry in Pyrite …
Gold in fractured pyrite. (A) LA-ICPMS maps in cps of fractured pyrite from the Kumtor deposit, Kyrgyzstan. Invisible Au-Te is indicated by the green and yellow, whereas orange and red indicate ...
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Chemical composition and sulfur isotope of pyrite from Zhibo iron ore
The Zhibo iron deposit is located in the eastern section of the Awulale iron metallogenic belt in Western Tianshan Mountains, Xinjiang. Magnetite is the major ore mineral and pyrite is the major ...
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Micromorphologies and sulfur isotopic compositions of pyrite in
Semantic Scholar extracted view of "Micromorphologies and sulfur isotopic compositions of pyrite in sandstone-hosted uranium deposits: A review and implications for ore genesis" by Liang Yue et al. ... Abstract Iron-bearing mineral assemblages and their distribution patterns directly reflect the redox environment in sediments, which plays a ...
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(PDF) Role of Arsenian Pyrite in Hydrothermal Ore
We suggest that invisible gold in arsenian pyrite and marcasite and arsenopyrite from sediment-hosted gold deposits represents Au removed from ore fluids by chemisorption at As-rich, Fe-deficient ...
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Ore-forming processes of the Baisong carbonate-hosted Pb-Zn …
The WHEG Pb-Zn ore belt, located in southeastern margin of the Yangtze plate, is mainly hosted in Cambrian carbonate platforms (Hu and Zhou, 2012).About 200 Pb-Zn deposits of different sizes were discovered in the belt, hosting a total sulfide ore resource of > 300 Mt (Wei et al., 2017).From north to south, major Pb-Zn deposits in the belt include the Limei, Yutang, …
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Texture and chemistry of pyrite at Chah Zard epithermal …
As one of the most common constituents of ore-bearing mineral assemblages, pyrite has the potential to provide useful information on ore-forming processes (Koglin et al., 2010).A significant body of data is now available on trace element distributions in pyrite by proton microprobe (Przybyłowicz et al., 1995, Reimold et al., 2004, Agangi et al., 2013) and laser …
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Synsedimentary, Diagenetic, and Metamorphic Pyrite, Pyrrhotite, …
Mentioning: 14 - Synsedimentary, Diagenetic, and Metamorphic Pyrite, Pyrrhotite, and Marcasite at the Homestake BIF-Hosted Gold Deposit, South Dakota, USA: Insights on Au-As Ore Genesis from Textural and LA-ICP-MS Trace Element Studies - Steadman, Jeffrey A., Large, Ross R. ... Algoma-type banded iron formations (BIFs), ...
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Origin of the volcanic-hosted Yamansu Fe deposit
The Yamansu Fe deposit (32 Mt at 51% Fe) in the Eastern Tianshan Orogenic Belt of NW China is hosted in early Carboniferous volcano-sedimentary rocks and spatially associated with skarn. The paragenetic sequence includes garnet-diopside (I), magnetite (II), hydrous silicate-sulfide (III), and calcite-quartz (IV) stages. Pyrite associated with magnetite has a Re …
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Hydrothermal Fluid Processes and Evolution of the Giant Serra …
The Serra Norte Carajás banded iron-formation (BIF)-hosted iron ore deposits are located in the Carajás mineral province. The deposits are hosted in the ca. 2.7 Ga Grão Pará Group, a ...
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POLYMETALLIC VEIN AND REPLACEMENT DEPOSITS …
Igneous-hosted ore: In the central, hottest parts of mineralized systems, igneous host rocks are altered to quartz sericite-pyrite and quartz-clay (argillic) assemblages that grade into distal …
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BIF-hosted iron mineral system: A review
At the Urucum BIF-hosted iron ore deposits, large volumes of medium- to high-grade hematite ore are interpreted to be the result of supergene enrichment of iron by leaching of …
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Mineralogy, geochemistry, and genesis of the volcanic-hosted
The Somea iron deposit is located ~ 22 km northwest of Ahar, NW Iran. The lenticular iron ores are formed as open space fillings within the pinch and swell structures of a curved fault in a highly brecciated zone within the host andesitic to dacitic rocks. Fe mineralization comprises magnetite and pyrite in the hypogene zone and hematite, limonite, and goethite in …
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Pyrite geochemistry for deposit type prediction and exploration in …
Pyrite texture and paragenesis are important predictors of deposit type. Classifier yields 99 % accuracy for the test set. Model predicts pyrite sources at early-stage mineral …
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Distinguishing Ore Deposit Type and Barren Sedimentary Pyrite …
Specifically, we used LA-ICP-MS pyrite trace element data and Random Forests, an ensemble machine learning supervised classifier, to distinguish barren sedimentary pyrite and five ore deposit categories: iron oxide copper-gold (IOCG), orogenic Au, porphyry Cu, sedimentary …
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Pyrite geochemistry for deposit type prediction and exploration in …
Pyrite (FeS 2) is a ubiquitous mineral that is associated with most deposit types within the Golden Triangle.Trace elements are incorporated into pyrite through element substitution (e.g., ion exchange between As 1-and S; As 3+ and Fe; Deditius et al., 2008), chemical adsorption, or as physical entrapment of micron-inclusions (Cook and Chryssoulis, …
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Geochemical discrimination of pyrite in diverse ore deposit types
A discriminant analysis (DA), based on multi-element compositions of pyrite, distinguishes iron oxide-apatite (IOA), iron oxide copper-gold (IOCG), skarn Cu-(Fe), porphyry Cu-Mo, orogenic …
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Authigenesis at the Urals Massive Sulfide Deposits: Insight from Pyrite
The pyrite nodules from ore diagenites of the Urals massive sulfide deposits associated with various background sedimentary rocks are studied using optical and electron microscopy and LA-ICP-MS analysis. The nodules are found in sulfide–black shale, sulfide–carbonate–hyaloclastite, and sulfide–serpentinite diagenites of the Saf'yanovskoe, Talgan, and Dergamysh deposits, …
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Invisible Gold in Pyrite from Epithermal, Banded-Iron …
Minerals 2019, 9, 447 4 of 24 native gold. Pyrite is ubiquitous throughout the ore body. Several quartz veinlet systems are oriented radially with respect to a basement depression in the vicinity ...
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Pyrite geochemistry and its implications for ore formation in …
Several studies have shown that the pyrite chemistry is essential to investigate ore-forming processes, since different origins, compositions, and physicochemical conditions of ore-forming fluids or melts (e.g., temperature, acidity (pH), fO 2, fluid-wall rock interactions, and phase separation) from which pyrite precipitates can cause ...
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Coupled partitioning of Au and As into pyrite controls …
The giant Carlin-type Au deposits (Nevada, USA) contain gold hosted in arsenic-rich iron sulfide (pyrite), but the processes controlling the sequestration of Au in these hydrothermal systems are poorly understood.
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Synsedimentary to Early Diagenetic Gold in Black Shale-Hosted Pyrite
The Randalls district comprises three individual gold deposits -Cock-Eyed Bob, Maxwells, and Santa-Craze -hosted in the same unit of banded iron-formation (BIF) in the southern Eastern Goldfields Superterrane, Yilgarn Craton, Western Australia. ... Au IN BLACK SHALE-HOSTED PYRITE NODULES the irst ore event—Fimiston—at ≤2650 Ma) in a ...
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