Mineralogical controls on antimony and arsenic mobility during tetrahedrite-tennantite weathering at historic mine sites Špania Dolina-Piesky and Ľubietová-Svätodušná, Slovakia
| Autor: | Anežka Borčinová Radková, Martin Chovan, Martin Števko, Juraj Majzlan, Heather E. Jamieson, Bronislava Lalinská-Voleková |
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| Rok vydání: | 2018 |
| Předmět: |
Mineral
Chalcopyrite Tetrahedrite Metallurgy Inorganic chemistry chemistry.chemical_element 010501 environmental sciences engineering.material 010502 geochemistry & geophysics 01 natural sciences Copper Romeite Geophysics chemistry Antimony Geochemistry and Petrology Tennantite visual_art engineering visual_art.visual_art_medium Arsenic Geology 0105 earth and related environmental sciences |
| Zdroj: | American Mineralogist. |
| ISSN: | 1945-3027 0003-004X |
| Popis: | The legacy of copper (Cu) mining at Spania Dolina-Piesky and Ľubietova-Svatodusna (central Slovakia) is waste rock and soil, surface waters, and groundwaters contaminated with antimony (Sb), arsenic (As), Cu, and other metals. Copper ore is hosted in chalcopyrite (CuFeS 2 ) and sulfosalt solid-solution tetrahedrite-tennantite {Cu 6 [Cu 4 (Fe,Zn) 2 ]Sb 4 S 13 –Cu 6 [Cu 4 (Fe,Zn) 2 ]As 4 S 13 } that show wide-spread oxidation characteristic by olive-green color secondary minerals. Tetrahedrite-tennantite can be a significant source of As and Sb contamination. Synchrotron-based μ-XRD, μ-XRF, and μ-XANES combined with electron microprobe analyses have been used to determine the mineralogy, chemical composition, element distribution, and Sb speciation in tetrahedrite-tennantite oxidation products in waste rock. Our results show that the mobility of Sb is limited by the formation of oxidation products such as tripuhyite and romeite group mineral containing 36.54 wt% Sb for samples where the primary mineral chemical composition is close to tetrahedrite end-member. Antimony K -edge μ-XANES spectra of these oxidation products indicate that the predominant Sb oxidation state is 5 + . Arsenic and Cu are also hosted by amorphous phases containing 6.23 wt% Sb on average and these are intergrown with tripuhyite and romeite. Antimony in this environment is not very mobile, meaning it is not easily released from solid phases to water, especially compared to As, Cu, and S. For samples where the primary sulfosalt is close to tennantite composition, the oxidation products associated with tennantite relicts contain 2.43 wt% Sb and are amorphous. The variable solubility of the secondary minerals that have been identified is expected to influence mobility of Sb and As in near-surface environment. |
| Databáze: | OpenAIRE |
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