scholarly journals A new kind of invisible gold in pyrite hosted in deformation-related dislocations

Geology ◽  
2021 ◽  
Author(s):  
Denis Fougerouse ◽  
Steven M. Reddy ◽  
Mark Aylmore ◽  
Lin Yang ◽  
Paul Guagliardo ◽  
...  
Keyword(s):  
Metallic Nanoparticles ◽  
Gold Alloy ◽  
Significant Proportion ◽  
Gold Production ◽  
Gold Ores ◽  
Invisible Gold ◽  
Pair Model ◽  
Geochemical Analyses ◽  
Element Enrichment ◽  
Trace Element Enrichment

Mining of “invisible gold” associated with sulfides in gold ores represents a significant proportion of gold production worldwide. Gold hosted in sulfide minerals has been proposed to be structurally bound in the crystal lattice as a sulfide-gold alloy and/or to occur as discrete metallic nanoparticles. Using a combination of microstructural quantification and nanoscale geochemical analyses on a pyrite crystal from an orogenic gold deposit, we show that dislocations hosted in a deformation low-angle boundary can be enriched in Ni, Cu, As, Pb, Sb, Bi, and Au. The cumulative trace-element enrichment in the dislocations is 3.2 at% higher compared to the bulk crystal. We propose that trace elements were segregated during the migration of the dislocation following the dislocation-impurity pair model. The gold hosted in nanoscale dislocations represents a new style of invisible gold.

GEOGENIC TRACE ELEMENT ENRICHMENT IN THE NORTHERN DEVELI CLOSED BASIN (KAYSERI, TURKEY)

2017 ◽  
Author(s):  
Cigdem Yucel ◽  
◽  
Sebnem Arslan ◽  
Sebnem Arslan ◽  
Mehmet Celik ◽  
...  
Keyword(s):  
Trace Element ◽  
Closed Basin ◽  
Element Enrichment ◽  
Trace Element Enrichment

Reactive trace element enrichment in a highly modified, tidally inundated acid sulfate soil wetland: East Trinity, Australia

2010 ◽  
Vol 60 (4) ◽  
pp. 620-626 ◽  
Author(s):  
Annabelle F. Keene ◽  
Scott G. Johnston ◽  
Richard T. Bush ◽  
Edward D. Burton ◽  
Leigh A. Sullivan
Keyword(s):  
Trace Element ◽  
Acid Sulfate Soil ◽  
Acid Sulfate ◽  
Element Enrichment ◽  
Trace Element Enrichment

scholarly journals Correction: Lead isotope evidence for young trace element enrichment in the oceanic upper mantle

Nature ◽  
1993 ◽  
Vol 362 (6416) ◽  
pp. 184-184 ◽  
Author(s):  
Alex N. Halliday ◽  
Gareth R. Davies ◽  
Der-Chuen Lee ◽  
Simone Tommasini ◽  
Cassi R. Paslick ◽  
...  
Keyword(s):  
Trace Element ◽  
Upper Mantle ◽  
Lead Isotope ◽  
Isotope Evidence ◽  
Element Enrichment ◽  
Trace Element Enrichment

Pétrologie du granite peralcalin du lac Brisson, Labrador central, Nouveau-Québec. 1. Mode de mise en place et évolution chimique

1992 ◽  
Vol 29 (2) ◽  
pp. 353-372 ◽  
Author(s):  
D. Pillet ◽  
M. Chenevoy ◽  
M. Bélanger
Keyword(s):  
Fractional Crystallization ◽  
Fluid Phase ◽  
Major Elements ◽  
Magmatic Stage ◽  
Recent Phase ◽  
Element Enrichment ◽  
Magmatic Suite ◽  
End Members ◽  
Trace Element Enrichment ◽  
Middle Proterozoic

The Lake Brisson peralkaline granite in Labrador, which by way of its age of 1189 Ma is the most recent phase of the Gardar magmatic stage, was intruded in the Middle Proterozoic at the margin of a granulitic complex, retrograded to an amphibolite facies during Aphebian, and of an Elsonian adamellite pluton. It shows a petrographie zonation ("feldspathic" facies at the center, "quartzose" facies including early quartz at the edge) suggestive of a permissive multiphase intrusion, and is characterized by deuteritic alteration via metalliferous fluids (Zr, Y, Nb, Be; rare earths). All facies are Na-peralkaline, well evolved, and represent end-members of a differentiated magmatic suite of the designated A type. The relative behavior of the major elements indicates that the facies differentiation was controlled by fractional crystallization and was also greatly influenced by alkaline feldspath and by increase of f(O2) in the final stage of evolution. The trace elements contents, significantly higher than those reported for other peralkaline complexes, are a confirmation of the influence of fractional crystallization. The unsual trace element enrichment in an altered quartzose facies is the result of the effects of a final oxidizing fluid phase, rich in F; the relative depletion of Na and the enrichment in Sr and Ca of the fluid are explained by its having been contaminated by the wall rocks. [Journal Translation]

scholarly journals Gradual and selective trace-element enrichment in slab-released fluids at sub-arc depths

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Simona Ferrando ◽  
Maurizio Petrelli ◽  
Maria Luce Frezzotti
Keyword(s):  
Trace Element ◽  
Aqueous Fluid ◽  
Major And Trace Elements ◽  
Ultrahigh Pressure ◽  
Silicate Melts ◽  
Convergent Margins ◽  
Hydrous Silicate ◽  
Dehydration Reactions ◽  
Element Enrichment ◽  
Trace Element Enrichment

Abstract The geochemical signature of magmas generated at convergent margins greatly depends on the nature of fluids and melts released during subduction. While major- and trace-elements transport capacity of ultrahigh pressure (UHP) hydrous-silicate melts has been investigated, little is known about solute enrichment and fractionation in UHP (>3.5–4 GPa) solute-rich aqueous fluids released along colder geothermal gradients. Here, we performed in situ LA-ICP-MS trace-element analyses on selected UHP prograde-to-peak fluid inclusions trapped in a kyanite-bearing quartzite from Sulu (China). The alkali-aluminosilicate-rich aqueous fluid released from the meta-sediments by dehydration reactions is enriched in LILE, U, Th, Sr, and REE. Inclusions trapped at increasing temperature (and pressure) preserve a gradual and selective trace-element enrichment resulting from the progressive dissolution of phengite and carbonate and the partial dissolution of allanite/monazite. We show that, at the investigated P-T conditions, aqueous fluids generated by dissolution of volatile-bearing minerals fractionate trace-element distinctly from hydrous-silicate melts, regardless of the source lithology. The orogenic/post-orogenic magmas generated in a mantle enriched by metasomatic processes involving either solute-rich aqueous fluids or hydrous-silicate melts released by the slab at UHP conditions can preserve evidence of the nature of these agents.

Comparison of Methods of Trace Element Enrichment for XRF Determination

1980 ◽  
pp. 469-476 ◽  
Author(s):  
D.E. LEYDEN ◽  
W. WEGSCHEIDER ◽  
W.B. BODNAR ◽  
E.D. SEXTON ◽  
W.K. NONIDEZ
Keyword(s):  
Trace Element ◽  
Comparison Of Methods ◽  
Element Enrichment ◽  
Trace Element Enrichment

scholarly journals A Review of the Cyanidation Treatment of Copper-Gold Ores and Concentrates

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 897 ◽  
Author(s):  
Diego Medina ◽  
Corby G. Anderson
Keyword(s):  
Effective Treatment ◽  
Review Paper ◽  
Mining Industry ◽  
Gold Production ◽  
Gold Ores ◽  
Silver Copper ◽  
Copper Gold

Globally, copper, silver, and gold orebody grades have been dropping, and the mineralogy surrounding them has become more diversified and complex. The cyanidation process for gold production has remained dominant for over 130 years because of its selectivity and feasibility in the mining industry. For this reason, the industry has been adjusting its methods for the extraction of gold, by utilizing more efficient processes and technologies. Often, gold may be found in conjunction with copper and silver in ores and concentrates. Hence, the application of cyanide to these types of ores can present some difficulty, as the diversity of minerals found within these ores can cause the application of cyanidation to become more complicated. This paper outlines the practices, processes, and reagents proposed for the effective treatment of these ores. The primary purpose of this review paper is to present the hydrometallurgical processes that currently exist in the mining industry for the treatment of silver, copper, and gold ores, as well as concentrate treatments. In addition, this paper aims to present the most important challenges that the industry currently faces, so that future processes that are both more efficient and feasible may be established.

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