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Diarsenides as silver precipitants

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Journal Article
Journal: Economic Geology
Published: 01 April 1917
Economic Geology (1917) 12 (3): 207–218.
Journal Article
Published: 01 October 2007
The Canadian Mineralogist (2007) 45 (5): 1147–1176.
... fluids remobilized older products of mineralization. Mixing of these fluids with more alkaline formation-waters from the Mesozoic cover rocks resulted in the precipitation of the silver alloys in an enrichment zone at P–T conditions of 120–150°C and approximately 200 bars. A significant shift in pH from...
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Journal Article
Published: 01 April 2012
The Canadian Mineralogist (2012) 50 (2): 447–470.
... of the hydrothermal fluids responsible of the precipitation of various Bou Azzer ores through the study of fluid inclusions and stable isotopes. The depositional sequences of the ore deposits tend to follow a similar pattern, characterized by the early crystallization of diarsenides followed by triarsenides...
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Journal Article
Journal: Economic Geology
Published: 01 March 2009
Economic Geology (2009) 104 (2): 249–266.
... ). Safflorite (Co diarsenide) and loellingite (Fe diarsenide) are widespread. Safflorite occurs as small to medium, euhedral to sub-hedral, crystals locally associated with skutterudite (Fig. 5C ). Loellingite is widely distributed as lustrous granular masses and scaly aggregates. It has a brilliant silver...
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Journal Article
Published: 01 June 2002
Mineralogical Magazine (2002) 66 (3): 385–407.
... sequential stages of deposition are identified, which are (1) the Cu stage, (2) the main Co-Ni-Bi stage, and (3) the late stage. The arsenide minerals, notably skutterudite, diarsenides and sulpharsenides, show a large range of compositional variation in Co-Ni-Fe space. A relatively limited number...
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Journal Article
Journal: Economic Geology
Published: 01 December 2021
Economic Geology (2021) 116 (8): 1893–1915.
...- (black), di- (light gray), and triarsenides (dark gray) compositions as mole fractions. B. Sulfur and As compositions (mol %) of diarsenides (light gray) and triarsenides (dark gray). C. Ternary Ag-As-S diagram (mol %), including native silver (native Ag), acanthite, proustite, lenaite, and argentopyrite...
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Journal Article
Published: 01 September 2015
South African Journal of Geology (2015) 118 (3): 275–284.
... during preliminary stages of research into copper-silver mineralisation in the D’kar Formation. The PGM are associated mainly with molybdenite, bismuth-bearing minerals and copper sulphides. The combination of reflected light microscopy and SEM-EDAX analyses revealed a presence of Pd-Hg tellurides...
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Journal Article
Published: 08 December 2023
Geochemistry: Exploration, Environment, Analysis (2023) 23 (4): geochem2023-035.
.... Textural observations suggest that the Ag, Co and Ni mineralization postdates the major phase of Cu sulfide precipitation. It is shown that in the Nowa Sól deposit, the Kupferschiefer horizon has acted as a geochemical barrier for the above-mentioned metals during protracted time, from early...
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Journal Article
Journal: Economic Geology
Published: 01 March 2015
Economic Geology (2015) 110 (2): 291–314.
... of solidified native Bi droplets suggests a temperature range of 270° to <400°C for precipitation of this assemblage. The final stage of retrograde mineralization consists of a chalcopyrite-bismuthinite-hematite-chlorite assemblage, together with hastingsite ± emplectite, which formed at temperatures of less...
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Journal Article
Journal: Economic Geology
Published: 01 September 2010
Economic Geology (2010) 105 (6): 1071–1096.
... digestion. Gold and PGE were collected from 15 g of sample (for disseminated ores), 7.5 g of sample (for massive ores), and 5 g of sample (for chalcopyrite-rich ores) by Ni sulfide fire assay, followed by Te co-precipitation, followed by ICP-MS solution analysis using a slight modification of Jackson et al...
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Journal Article
Published: 01 October 2008
American Mineralogist (2008) 93 (10): 1686–1691.
..., quartz, Hg-rich native silver, stolzite, otjisumerite, and various members of the alunite supergroup. Calvertite has a metallic luster, irregular to conchoidal fracture, brittle tenacity, and no cleavage or parting. It is macroscopically black. The VHN is 283 kg/mm 2 (Mohs hardness 4 to 5...
Journal Article
Journal: Economic Geology
Published: 01 September 2004
Economic Geology (2004) 99 (6): 1249–1260.
... of zircon by metamorphic fluids: U-Pb age depth-profiling of zircon crystals from Barrow’s garnet zone, northeast Scotland —Christopher M. Breeding, Jay J. Ague, Marty Grove, and Andrew L. Rupke 1067 Silver, zinc, and copper exchange in a Na-clinoptilolite and resulting effect...
Journal Article
Published: 13 December 2021
The Canadian Mineralogist (2021) 59 (6): 1511–1542.
... that hydrothermal fluids were responsible for the release of the PGE from the sulfides to precipitate platinum-group minerals (PGM) at low temperature, and Tao et al . (2007) suggested that hydrothermal alteration affected the final distributions of Pt and Pd in the samples. As a result of hydrothermal...
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Journal Article
Journal: Economic Geology
Published: 01 September 2005
Economic Geology (2005) 100 (6): 1265–1276.
... Yifeng, and Zeng Pusheng     98 Geology and D-O-C isotope systematics of the Tieluping silver deposit, Henan, China: Implications for ore genesis —Chen Yanjing, Franco Pirajno, and Sui Yinghui     106 Organic geochemistry of sedimentary rock-hosted disseminated gold deposits in southwestern...
Journal Article
Published: 01 August 2007
The Canadian Mineralogist (2007) 45 (4): 723–750.
..., we prefer a strictly hydrothermal model, according to which all or most of the metals were derived from deep-seated sources, transported upward by hydrothermal fluids, and precipitated by thermochemical reduction of sulfate due to interaction with the sulfur-bearing organic matter and the pyrite...
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Journal Article
Published: 01 February 2014
Mineralogical Magazine (2014) 78 (1): 11–27.
... anhydrous parageneses, while abundant magnetite was precipitated together with part of the scheelite. A temperature interval of 525 to 450°C was estimated for this stage, based on development of talc at the expense of forsterite and of tremolite at the expense of diopside ( Vander Auwera and Andre, 1991...
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Journal Article
Published: 01 January 2014
Reviews in Mineralogy and Geochemistry (2014) 79 (1): 17–184.
... geochemical fluids. Under mildly reducing conditions, arsenic can migrate as arsenous acid (H 3 AsO 3 ) or thioarsenite complexes many kilometers from its source in altered rocks or buried sediments, until changes in physico-chemical properties or solution chemistry lead to precipitation of arsenic sulfides...
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Journal Article
Published: 13 December 2021
The Canadian Mineralogist (2021) 59 (6): 1453–1484.
...). The PGE were pre-concentrated by Ni-sulfide fire assay followed by co-precipitation with Te and were analyzed by solution inductively coupled plasma-mass spectrometry (ICP-MS) using the method described by Savard et al . (2010) . Sulfur was determined via combustion and infrared analysis using...
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Journal Article
Journal: Economic Geology
Published: 01 March 2014
Economic Geology (2014) 109 (2): 343–366.
... and Watkinson, 1997 ; Molnár et al., 2001 ; Hanley et al., 2005 ; Péntek et al., 2008 ; Carter et al., 2009 ) suggest that the Cu-rich ores at Sudbury are the product of hydrothermal remobilization of Cu, Pt, Pd, and Au from the Cu-poor ores and that the PGM precipitated from the hydrothermal fluid. One...
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Published: 01 January 2005
DOI: 10.5382/AV100.32
EISBN: 9781934969519
... and these may have formed a cap to fluid flow. In one pit, massive pyrite horizons with traces of sphalerite in black shales occur above siderite ores, indicating that the shales may have served as reductants during metal precipitation. Two major intrusive bodies located within the Riphean metasedimentary...