Bonanza-type epithermal Ag-Au mineralisation in Nová Baňa (Western Carpathians, Slovakia)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F25%3A10136952" target="_blank" >RIV/00023272:_____/25:10136952 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0169136825000538" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0169136825000538</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.oregeorev.2025.106493" target="_blank" >10.1016/j.oregeorev.2025.106493</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Bonanza-type epithermal Ag-Au mineralisation in Nová Baňa (Western Carpathians, Slovakia)

Popis výsledku v původním jazyce

The Miocene bonanza-type epithermal mineralisation Sibenicny vrch is located in the western part of the historic Nova Bana deposit on the western slope of the Stiavnica stratovolcano. In the near-surface primary samples, bonanza accumulations contain up to 1700 ppm Ag and 283 ppm Au, while the Cu content does not exceed 59 ppm. This unusual geochemical signature, where Au exceeds Cu, Pb, or Zn, led to formation of unique mineral association in the studied samples. In this work, we focus on this mineral assemblage and its formation. The bonanza ores are banded, with rhythmically alternating chalcedony, quartz with enclosed adularia, and irregular accumulations of precious-metal minerals. The mineral assemblage hosted in the near-surface samples comprises pyrite, rozhdestvenskayaite-(Zn), zvestovite-(Zn), zvestovite-(Fe), argentopolybasite, argentopearceite, auropolybasite, auropearceite, Au-Ag alloys, stephanite, selenostephanite, pyrargyrite, proustite, naumannite, uytenbogaardtite, iodargyrite, and bromargyrite. These minerals document high concentration of Au, Ag, Sb, As, Se, and S in the fluid, simultaneously with lack of Cu, Pb, and Zn. Some of these sulfides incorporated Au in their structure, even though under usual geochemical conditions, they would not do so. The deeper parts of the same vein (163-166 m below the current surface) are characterised by lower Au and Ag contents (&lt;84 ppm Ag, &lt;6.95 ppm Au) and the mineral assemblage of chalcopyrite, galena, sphalerite, Au-Ag alloys, polybasite, and pearceite. Ore-bearing colloform bands of chalcedony consist of various textures, predominantly mosaic, acicular/pseudoacicular, flamboyant, or moss textures. We assume that the genesis of these chalcedony forms is related to the fluid boiling. Crustiform quartz in the deeper parts of the vein is most likely related to fluid mixing.

Název v anglickém jazyce

Bonanza-type epithermal Ag-Au mineralisation in Nová Baňa (Western Carpathians, Slovakia)

Popis výsledku anglicky

The Miocene bonanza-type epithermal mineralisation Sibenicny vrch is located in the western part of the historic Nova Bana deposit on the western slope of the Stiavnica stratovolcano. In the near-surface primary samples, bonanza accumulations contain up to 1700 ppm Ag and 283 ppm Au, while the Cu content does not exceed 59 ppm. This unusual geochemical signature, where Au exceeds Cu, Pb, or Zn, led to formation of unique mineral association in the studied samples. In this work, we focus on this mineral assemblage and its formation. The bonanza ores are banded, with rhythmically alternating chalcedony, quartz with enclosed adularia, and irregular accumulations of precious-metal minerals. The mineral assemblage hosted in the near-surface samples comprises pyrite, rozhdestvenskayaite-(Zn), zvestovite-(Zn), zvestovite-(Fe), argentopolybasite, argentopearceite, auropolybasite, auropearceite, Au-Ag alloys, stephanite, selenostephanite, pyrargyrite, proustite, naumannite, uytenbogaardtite, iodargyrite, and bromargyrite. These minerals document high concentration of Au, Ag, Sb, As, Se, and S in the fluid, simultaneously with lack of Cu, Pb, and Zn. Some of these sulfides incorporated Au in their structure, even though under usual geochemical conditions, they would not do so. The deeper parts of the same vein (163-166 m below the current surface) are characterised by lower Au and Ag contents (&lt;84 ppm Ag, &lt;6.95 ppm Au) and the mineral assemblage of chalcopyrite, galena, sphalerite, Au-Ag alloys, polybasite, and pearceite. Ore-bearing colloform bands of chalcedony consist of various textures, predominantly mosaic, acicular/pseudoacicular, flamboyant, or moss textures. We assume that the genesis of these chalcedony forms is related to the fluid boiling. Crustiform quartz in the deeper parts of the vein is most likely related to fluid mixing.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Ore Geology Reviews

ISSN

0169-1368

e-ISSN

—

Svazek periodika

178

Číslo periodika v rámci svazku

březen 2025

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

1-15

Kód UT WoS článku

001430921800001

EID výsledku v databázi Scopus

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