Structure, stability and geochemical role of palladium chloride complexes in hydrothermal fluids

Bazarkina, Elena F.; Pokrovski, Gleb S.; Hazemann, Jean‐Louis

doi:10.1016/j.gca.2014.09.024

Cited by 52 publications

(19 citation statements)

References 110 publications

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“…Chlorine and sulfur are the main elements involved in the complexing of metals in natural hydrothermal fluids (e.g., Seward and Barnes, 1997). Consequently, a number of experimental studies have investigated Pd speciation and solubility in chloride and hydrosulfide solutions under hydrothermal conditions up to 700 ˚C (Hsu et al, 1991;Wood et al, 1992;Pan and Wood 1994;Gammons et al, 1992Gammons et al, , 1995Seward et al, 2002;Seward, 2005, 2007;Tagirov and Baranova, 2009;Tagirov et al, 2013;Bazarkina et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, if Pd solubilities in sulfur-rich solutions calculated on the basis of the earlier experimental studies by and Pan and Wood (1994) are in reasonable agreement, those predicted using the data of Tagirov and Baranova (2009) are several orders of magnitude lower. Furthermore, the absence of Pd(HS) 4 2-in the interpretation of experimental data (Tagirov et al, 2013;Wood et al, 1992) poses an interesting (geo)chemical conundrum, since the PdCl 4 2-complex is acknowledged by all studies to be the most important complex in chloride brines (see also Bazarkina et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The geometrical properties of Pd-Cl complexes have been investigated by X-ray absorption spectroscopy (XAS) (Seward et al, 2002;Seward and Driesner, 2004;Bazarkina et al, 2014). Several theoretical studies have also investigated the structure of Pd(II) complexes using ab initio calculations on gas-phase molecules (Boily and Seward, 2005;Boily et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Palladium complexation in chloride- and bisulfide-rich fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Mei

Etschmann

Liu

et al. 2015

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Palladium complexation in chloride- and bisulfide-rich fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Mei

Etschmann

Liu

et al. 2015

Geochimica et Cosmochimica Acta

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“…One of the problems associated with the formation of PGE-enriched porphyries is that it is very unlikely that hydrothermal fluids will contain enough Pd to reach saturation in order to allow PGM to precipitate directly and be incorporated into quartz rather than within sulphides (Bazarkina et al, 2014). This means an additional mechanism is needed that both sequesters the PGE more strongly than sulphide and allows the metals to remain associated with the hydrothermal fluid in high enough concentrations to precipitate the PGM directly from the fluid when conditions permit.…”

Section: The Role Of Semi-metals In Pge Enrichmentmentioning

confidence: 99%

Platinum-group minerals in the Skouries Cu-Au (Pd, Pt, Te) porphyry deposit

McFall

Naden

Roberts

et al. 2018

Ore Geology Reviews

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A B S T R A C TThe Skouries deposit is a platinum-group element (PGE) enriched Cu-Au porphyry system located in the Chalkidiki peninsula, Greece, with associated Ag, Bi and Te enrichment. The deposit is hosted by multiple porphyritic monzonite and syenite intrusions, which originated from a magma chamber at depth. An initial quartz monzonite porphyritic intrusion contains a quartz-magnetite ± chalcopyrite-pyrite vein stockwork with intense potassic alteration. The quartz monzonite intrusion is cross cut by a set of syenite and mafic porphyry dykes and quartz-chalcopyrite-bornite ± magnetite veins which host the majority of the Cu and Au mineralisation. Late stage quartz-pyrite veins, with associated phyllic alteration crosscut all previous vein generations. Electron microprobe and scanning electron microscopy shows that the PGE are hosted by platinum-group minerals (PGM) in the quartz-chalcopyrite-bornite ± magnetite veins and within potassic alteration assemblages. The PGE mineralisation in Skouries is therefore part of the main high temperature hypogene mineralisation event. [PdBi]. The most common platinum-group mineral is sopcheite. The PGM in Skouries are small, 52 µm 2 on average, and occur as spherical grains on the boundaries between sulphides and silicates, and as inclusions within hydrothermal quartz and sulphides. These observations support a "semi-metal collector model" whereby an immiscible Bi-Te melt acts as a collector for PGE and other precious metals in high temperature hydrothermal fluids. This mechanism would allow the formation of PGM in porphyries without Pt and Pd fluid saturation.

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“…The high demand for these metals in industry has led to a growing interest in their resources (Bazarkina, Pokrovski, Hazemann, 2014).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Neural Networks and Regression Time Series in Estimating the Development of the Afternoon Price of Palladium on the New York Stock Exchange

Vochоzka

2017

Trends Economics and Management

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Purpose of the article: Palladium is presently used for producing electronics, industrial products or jewellery, as well as products in the medical field. Its value is raised especially by its unique physical and chemical characteristics. Predicting the value of such a metal is not an easy matter (with regard to the fact that prices may change significantly in time). Methodology/methods: To carry out the analysis, London Fix Price PM data was used, i.e. amounts reported in the afternoon for a period longer than 10 years. To process the data, Statistica software is used. Linear regression is carried out using a whole range of functions, and subsequently regression via neural structures is performed, where several distributional functions are used again. Subsequently, 1000 neural networks are generated, out of which 5 proving the best characteristics are chosen. Scientific aim: The aim of the paper is to perform a regression analysis of the development of the palladium price on the New York Stock Exchange using neural structures and linear regression, then to compare the two methods and determine the more suitable one for a possible prediction of the future development of the palladium price on the New York Stock Exchange. Findings: Results are compared on the level of an expert perspective and the evaluator'seconomist's experience. Within regression time lines, the curve obtained by the least squares methods via negative-exponential smoothing gets closest to Palladium price line development. Out of the neural networks, all 5 chosen networks prove to be the most practically useful. Conclusions: Because it is not possible to predict extraordinary situations and their impact on the palladium price (at most in the short term, but certainly not over a long period of time), simplification and the creation of a relatively simple model is appropriate and the result is useful.

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Structure, stability and geochemical role of palladium chloride complexes in hydrothermal fluids

Cited by 52 publications

References 110 publications

Palladium complexation in chloride- and bisulfide-rich fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Palladium complexation in chloride- and bisulfide-rich fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Platinum-group minerals in the Skouries Cu-Au (Pd, Pt, Te) porphyry deposit

Comparison of Neural Networks and Regression Time Series in Estimating the Development of the Afternoon Price of Palladium on the New York Stock Exchange

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