Synergies in elemental mobility during weathering of tetrahedrite [(Cu, Fe, Zn) 12 (Sb, As) 4S13]: Field observations, electron microscopy, isotopes of Cu, C, O, radiometric dating, and water geochemistry

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F18%3A10134121" target="_blank" >RIV/00023272:_____/18:10134121 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.chemgeo.2018.04.021" target="_blank" >http://dx.doi.org/10.1016/j.chemgeo.2018.04.021</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.chemgeo.2018.04.021" target="_blank" >10.1016/j.chemgeo.2018.04.021</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Synergies in elemental mobility during weathering of tetrahedrite [(Cu, Fe, Zn) 12 (Sb, As) 4S13]: Field observations, electron microscopy, isotopes of Cu, C, O, radiometric dating, and water geochemistry

Popis výsledku v původním jazyce

Tetrahedrite is commonly present in many ore deposits and may be transferred to mining waste. Here, we describe the behavior of all elements in tetrahedrite during oxidative dissolution in a natural oxidation zone at Piesky (Slovakia), this being a long-term analogue of weathering of tetrahedrite-rich mining wastes. Electron microprobe work identified initial, early, advanced, and mature stages of weathering. The initial stages include formation of secondary covellite and chalcocite, the following stages only oxidic products, divided into greenish masses and brown veinlets. Both of them are nanocrystalline mixtures of minerals. The masses are Cu-Sb-As-rich and consist of a nanocrystalline pyrochlore phase. The veinlets are Fe-Sb-As rich and contain tripuhyite, goethite, and pyrochlores. Quantitative elemental budgets show that some elements (Zn, S, Ni, Co) are rapidly lost whereas others are retained and form copper arsenates in the mature stages of weathering. About 10% As and almost 50% of Sb are lost during weathering, likely released into water; some Sb is stored in secondary minerals such as camerolaite, cualstibite, or tripuhyite. Light carbon isotopic composition (delta C-13 down to -11.1%) document significant biological contribution for C in the secondary minerals. Copper isotopes become progressively heavier during weathering (from initial delta Cu-65 of -2.45 parts per thousand in tetrahedrite up to 4.3 parts per thousand in some azurite samples but -6.3 parts per thousand in covellite and chalcocite), documenting cyclic removal of light copper isotopes into covellite and chalcocite. The observation of elemental synergies during weathering of tetrahedrite shows that the solubility and mobility of As is controlled by copper arsenates, not by iron oxides, in an environment rich in tetrahedrite but poor in pyrite.

Název v anglickém jazyce

Synergies in elemental mobility during weathering of tetrahedrite [(Cu, Fe, Zn) 12 (Sb, As) 4S13]: Field observations, electron microscopy, isotopes of Cu, C, O, radiometric dating, and water geochemistry

Popis výsledku anglicky

Tetrahedrite is commonly present in many ore deposits and may be transferred to mining waste. Here, we describe the behavior of all elements in tetrahedrite during oxidative dissolution in a natural oxidation zone at Piesky (Slovakia), this being a long-term analogue of weathering of tetrahedrite-rich mining wastes. Electron microprobe work identified initial, early, advanced, and mature stages of weathering. The initial stages include formation of secondary covellite and chalcocite, the following stages only oxidic products, divided into greenish masses and brown veinlets. Both of them are nanocrystalline mixtures of minerals. The masses are Cu-Sb-As-rich and consist of a nanocrystalline pyrochlore phase. The veinlets are Fe-Sb-As rich and contain tripuhyite, goethite, and pyrochlores. Quantitative elemental budgets show that some elements (Zn, S, Ni, Co) are rapidly lost whereas others are retained and form copper arsenates in the mature stages of weathering. About 10% As and almost 50% of Sb are lost during weathering, likely released into water; some Sb is stored in secondary minerals such as camerolaite, cualstibite, or tripuhyite. Light carbon isotopic composition (delta C-13 down to -11.1%) document significant biological contribution for C in the secondary minerals. Copper isotopes become progressively heavier during weathering (from initial delta Cu-65 of -2.45 parts per thousand in tetrahedrite up to 4.3 parts per thousand in some azurite samples but -6.3 parts per thousand in covellite and chalcocite), documenting cyclic removal of light copper isotopes into covellite and chalcocite. The observation of elemental synergies during weathering of tetrahedrite shows that the solubility and mobility of As is controlled by copper arsenates, not by iron oxides, in an environment rich in tetrahedrite but poor in pyrite.

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

2018

Kód důvěrnosti údajů

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

Název periodika

Chemical Geology

ISSN

0009-2541

e-ISSN

—

Svazek periodika

488

Číslo periodika v rámci svazku

červen

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

20

Strana od-do

1-20

Kód UT WoS článku

000432528200001

EID výsledku v databázi Scopus

—