scholarly journals Selenium in pyrite ores

2019 ◽  
Vol 484 (3) ◽  
pp. 320-324
Author(s):  
I. V. Vikentyev ◽  
E. V. Belogub ◽  
V. P. Moloshag ◽  
N. I. Eremin
Keyword(s):  
Electron Probe ◽  
Analytical Electron Microscopy ◽  
Massive Sulfide ◽  
Sulfide Ores ◽  
The Urals ◽  
Icp Ms ◽  
Vms Deposits ◽  
Analytical Electron ◽  
Local Methods ◽  
Pyrite Ores

Own Se minerals, first established in primary ores of VMS deposits of the Urals, are described. Instrumental neutron activation analysis of bulk ore samples, mineral monofractions and local methods of analysis: LA-ICP- MS, electron probe microanalysis and analytical electron microscopy were used. CSe in ores of the Urals to 977 g/t. Significant positive correlation of Se with Te, S, Fe, Co, Mo, Hg, Bi is characteristic. Selenium is con- centrated in the main sulfides, mainly in pyrite (73 g/t), chalcopyrite 49 g/t, pyrrhotite 48 g/t; in sphalerite usually <10 g/t. High Se content (up to 1–3 wt.%) occurs in the minor and rare minerals from massive sulfide ores (mainly compounds of Pb, Te, Bi): tetradymite, galena, tellurobismuthite, altaite, wittichenite. Own Se minerals in ores are represented by kawazulite, clausthalite, galena-clausthalite Pb(Se,S), micron inclusions composition (Ag, Cu)2(Se, S), (Ag, Pb)3(Te, Se)S, (Ag, Pb)2(S, Se).

Sources of material for massive sulfide deposits in the Urals: Evidence from the high-precision MC-ICP-MS isotope analysis of Pb in galena

2008 ◽  
Vol 418 (1) ◽  
pp. 178-183 ◽  
Author(s):  
I. V. Chernyshev ◽  
I. V. Vikent’ev ◽  
A. V. Chugaev ◽  
K. N. Shatagin ◽  
V. P. Moloshag
Keyword(s):  
High Precision ◽  
Isotope Analysis ◽  
Massive Sulfide ◽  
The Urals ◽  
Sulfide Deposits ◽  
Massive Sulfide Deposits ◽  
Icp Ms

Speciation of noble metals and conditions of their concentration in massive sulfide ores of the Urals

2006 ◽  
Vol 48 (2) ◽  
pp. 77-107 ◽  
Author(s):  
I. V. Vikent’ev ◽  
V. P. Moloshag ◽  
M. A. Yudovskaya
Keyword(s):  
Noble Metals ◽  
Massive Sulfide ◽  
Sulfide Ores ◽  
The Urals

Development of a laser ablation ICP-MS method for the analysis of fluid inclusions associated with volcanogenic massive sulfide deposits

2021 ◽  
pp. geochem2020-043
Author(s):  
Madison A. Schmidt ◽  
Matthew I. Leybourne ◽  
Jan M. Peter ◽  
Duane C. Petts ◽  
Simon E. Jackson ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Fluid Inclusions ◽  
Inductively Coupled Plasma ◽  
Massive Sulfide ◽  
Ore Deposits ◽  
Volcanogenic Massive Sulfide ◽  
Metals And Metalloids ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Vms Deposits

There is increasing acceptance of the presence of variable magmatic contributions to the mineralizing fluids in the formation of volcanogenic massive sulfide (VMS) deposits. The world-class Windy Craggy Cu-Co-Au deposit (>300 MT @ 2.12 wt.% Cu) in northwestern British Columbia is of interest because, unlike most VMS deposits, quarts fluid inclusions from within the deposit range from relatively low to intermediate salinity (most 6-16 wt.% equivalent). In this study we used an excimer (193 nm) laser ablation system interfaced to a quadrupole inductively coupled plasma mass spectrometer to quantify key metals and metalloids that are considered by many to be indicative of magmatic contributions to hydrothermal ore deposits. Although LA-ICP-MS signals from these low-salinity inclusions are highly transient, we were able to quantify Na, Mg, K, Ca, Mn, Fe, Co, Cu, Zn, Sr, Sn, Ba, Ce, Pb and Bi consistently – of the 34 elements that were monitored. Furthermore, Cl, Sb, Cd, Mo, Rb, Br, and As were also measured in a significant number of inclusions. Comparison of the fluid inclusion chemistry with unaltered and altered mafic volcanic and sedimentary rocks and mineralized samples from the deposit indicate that enrichment in the main ore metals (Cu, Zn, Fe, Pb) in the inclusions reflects that of the altered rocks and sulfides. Metals and metalloids that may indicate a magmatic contribution typically show much greater enrichments in the fluid inclusions much greater over the host rocks at the same Cu concentration; in particular Bi, Sn and Sb are significantly elevated when compared to the host rock samples. These data are consistent with the ore-forming fluids at Windy Craggy having a strong magmatic contribution.

Reduction of contamination in analytical electron microscopy by using specially designed cold traps

1978 ◽  
Vol 36 (1) ◽  
pp. 114-115
Author(s):  
T. Tomita ◽  
Y. Harada ◽  
H. Watanabe ◽  
T. Etoh
Keyword(s):  
Electron Microscopy ◽  
Electron Probe ◽  
Analytical Electron Microscopy ◽  
Cold Trap ◽  
Transmission Electron Microscopy Specimen ◽  
Transmission Electron ◽  
Analytical Electron ◽  
Hydrocarbon Molecules ◽  
Electron Microscopes ◽  
Conventional Type

For conventional transmission electron microscopy, specimen contamination is not so important as to take it into account, because recent electron microscopes are designed so as to provide the specimen chamber with a vacuum of the order of 10-7 Torr. However, in analytical electron microscopy, contamination still presents serious problems requiring solution, because a very fine electron probe (less than 200Å) remains stationary on the specimen for a few minutes. In this case, a contamination spot is formed by the reaction of the electron probe with hydrocarbon molecules adsorbed on the specimen surface. The present paper describes detailed observations of contamination spots caused by very fine electron probe and the reduction of contamination spots by means of a specially designed liquid nitrogen cold trap assembly.This cold trap assembly shown in Fig. 1 consists of two traps; an inner trap and outer trap. The inner trap, which is a conventional type, is designed to enclose the specimen.

Chimneys in Paleozoic massive sulfide mounds of the Urals VMS deposits: Mineral and trace element comparison with modern black, grey, white and clear smokers

2017 ◽  
Vol 85 ◽  
pp. 64-106 ◽  
Author(s):  
V.V. Maslennikov ◽  
S.P. Maslennikova ◽  
R.R. Large ◽  
L.V. Danyushevsky ◽  
R.J. Herrington ◽  
...  
Keyword(s):  
Trace Element ◽  
Massive Sulfide ◽  
The Urals ◽  
Vms Deposits

scholarly journals Electron Probe X-Ray Microanalysis in Pathology and Research

2013 ◽  
Vol 19 (S4) ◽  
pp. 1-2 ◽  
Author(s):  
A. LeFurgey ◽  
P. Ingram
Keyword(s):  
Electron Microscopy ◽  
Electron Probe ◽  
Clinical Medicine ◽  
Analytical Electron Microscopy ◽  
Urinary Calculi ◽  
Energy Dispersive ◽  
X Ray ◽  
Analytical Electron ◽  
Foreign Materials ◽  
Tissue Reactions

A variety of frequently encountered clinical problems lend themselves readily to investigation by analytical electron microscopy. e.g., a combination of scanning or transmission electron microscopy and energy dispersive x-ray microanalysis. The most common application is identification of xenobiotics or exogenous substances, such as localization and quantitation of inorganic particulates in lung tissues in patients with pneumoconiosis; identification of foreign materials within granulomas; and analysis of foreign bodies. Electron probe X-ray microanalysis (EPXMA) is also useful in the study of tissue reactions to various surgical implants of foreign materials. A variety of metals and other elements may be detected with energy dispersive X-ray analysis, including copper in tissues of patients with Wilson’s disease, thorium and gadolinium in patients injected with radiographic contrast agents (Figure 1), or gold in patients treated with long-term chrysotherapy. Endogenous particulates such as urinary calculi (Figure 2), gallstones, intraarticular and periarticular crystalline deposits in patients with rheumatic disease, dystrophic or metastatic calcifications, and hemosiderin may be analyzed rapidly and efficiently by means of EDX. Certain organometallic drugs such as amiodarone (iodine) or sodium stibogluconate (antimony) may also be detected in human tissues. Analytical electron microscopy has been a useful adjunct to forensic pathology for many years in diverse areas such as identification of trace evidence constituents or detection of arsenic or lead in victims with heavy metal poisoning. The detailed elucidation of anatomic, physiologic, and pathologic conditions provided by analytical electron microscopy is a useful diagnostic and investigative tool in clinical medicine; the analytical results often have diagnostic, therapeutic, and/or medicolegal implications. This imaging technology should grow in utility in the future as it is complemented by other techniques such as mass spectrometry, and laser Raman and infrared microspectroscopy.

Interface microstructures in melt-textured YBa2Cu3O7-δ on Ag-Pd and flux pinning centers introduced by Y2BaCuO5 particles

1992 ◽  
Vol 50 (1) ◽  
pp. 72-73
Author(s):  
Z. L. Wang ◽  
A. Goyal ◽  
D. M. Kroeger
Keyword(s):  
Electron Microscopy ◽  
Electron Probe ◽  
Flux Pinning ◽  
Thick Films ◽  
Analytical Electron Microscopy ◽  
Pinning Centers ◽  
X Ray ◽  
Transmission Electron ◽  
Analytical Electron ◽  
Pd Alloy

Transmission electron microscopy (TEM) and energy dispersion X-ray spectroscopy (EDS) were used to study the microstructure of the melt-textured YBa2Cu3O7-δ (123) thick films on Ag-Pd substrate. The samples used for this study were melt-textured thick films of 123 on a Ag10%Pd alloy substrate. The film was prepared using a paint-on technique and was processed according to a schedule described elsewhere, Domains of 123, as large as 5-6 mm, are formed in the film. Analytical electron microscopy (AEM) studies of this material were made using a Philips EM400 TEM/STEM (100 kV) with a field emission gun (FEG). A small electron probe of diameter approximately 2 nm was generated, and used in determining the compositional change across grain boundaries.

Sign in / Sign up

Export Citation Format

Share Document