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Pollution sources and metallic elements mobility recorded by heavy minerals in soils affected by Cu-smelting (Legnica, SW Poland) Cover

Pollution sources and metallic elements mobility recorded by heavy minerals in soils affected by Cu-smelting (Legnica, SW Poland)

Open Access
|Feb 2024

Figures & Tables

Figure 1.

Schematic map of the studied area with the sampling points indicated (modified after Tyszka et al., 2016).
Schematic map of the studied area with the sampling points indicated (modified after Tyszka et al., 2016).

Figure 2.

Back-scattered electron images of two types of Fe oxides identified in this study. The two groups are identified based on their chemical composition and a distinct character of the groups is reflected by low and high totals of the electron microprobe analyses. These two groups are indicated in the Figure with different colors of the stars. (A) numerous spherical particles composed entirely of Fe-oxide with high totals; (B) small angular monomineralic fragments (i) and a larger porous particle (ii); (C) spherical particles (i), larger porous particles (ii) and anhedral, strongly porous grains (iii), (D) strongly porous grain with low total; (E) a Fe-rich glass-like material containing quartz grains; (F) a skeletal grain within a slag fragment (i), anhedral, strongly porous grains (ii), small angular monomineralic fragment (iii) and a spherical particle (iv); (G) larger porous particles.
Back-scattered electron images of two types of Fe oxides identified in this study. The two groups are identified based on their chemical composition and a distinct character of the groups is reflected by low and high totals of the electron microprobe analyses. These two groups are indicated in the Figure with different colors of the stars. (A) numerous spherical particles composed entirely of Fe-oxide with high totals; (B) small angular monomineralic fragments (i) and a larger porous particle (ii); (C) spherical particles (i), larger porous particles (ii) and anhedral, strongly porous grains (iii), (D) strongly porous grain with low total; (E) a Fe-rich glass-like material containing quartz grains; (F) a skeletal grain within a slag fragment (i), anhedral, strongly porous grains (ii), small angular monomineralic fragment (iii) and a spherical particle (iv); (G) larger porous particles.

Figure 3.

Composition of two types of Fe oxides (low and high totals) and Fe-rich silicates. The detection limit of electron microprobe analyses is indicated (det.lim.), phases shown in (A,B) and not in (C,D) have Pb and Cu contents below the detection limit.
Composition of two types of Fe oxides (low and high totals) and Fe-rich silicates. The detection limit of electron microprobe analyses is indicated (det.lim.), phases shown in (A,B) and not in (C,D) have Pb and Cu contents below the detection limit.

Figure 4.

Diverse slag fragments observed in the studied soils, the contents of chosen potentially toxic elements measured by electron micro-probe are indicated for each fragment. White symbols show places where such elements were below the detection limit. (A) slag dominated by glass containing euhedral spinels (lighter), and silicates (darker), weathering proceeds along rims and cracks, (B) two slag fragments containing glass and different phases, (i) not weathered, (ii) slightly weathered, the third fragment (iii) is strongly weathered and could represent slag or other anthropogenic material, (C) two slag fragments (i) slag showing extensive replacement by Fe-oxides, (ii) slightly weathered slag dominated by crystalline phases spinels and silicates, (D) unweathered slag dominated by Si-Pb glass containing skeletal crystals of Pb-poor silicate, (E) weathered slag fragmnents, (i) slag showing extensive replacement by Fe-oxides, (ii) slag dominated by Ba-silicates.
Diverse slag fragments observed in the studied soils, the contents of chosen potentially toxic elements measured by electron micro-probe are indicated for each fragment. White symbols show places where such elements were below the detection limit. (A) slag dominated by glass containing euhedral spinels (lighter), and silicates (darker), weathering proceeds along rims and cracks, (B) two slag fragments containing glass and different phases, (i) not weathered, (ii) slightly weathered, the third fragment (iii) is strongly weathered and could represent slag or other anthropogenic material, (C) two slag fragments (i) slag showing extensive replacement by Fe-oxides, (ii) slightly weathered slag dominated by crystalline phases spinels and silicates, (D) unweathered slag dominated by Si-Pb glass containing skeletal crystals of Pb-poor silicate, (E) weathered slag fragmnents, (i) slag showing extensive replacement by Fe-oxides, (ii) slag dominated by Ba-silicates.

Figure 5.

(A,B) Back-scattered electron images of Pb-rich silicate glass showing weathered rims. (C,D) Electron microprobe analyses shown for all analyzed particles in this group, the analyses are divided into three groups based on the observed extent of weathering in BSE images. The analytical points belonging to each group are shown in (A,B). (E–G) EDX maps for Pb, Si, and Ca of a Pb-silicate glass particle. The relative color intensity scale shows the element-rich (bright) and element-deficient (dark) parts of particles.
(A,B) Back-scattered electron images of Pb-rich silicate glass showing weathered rims. (C,D) Electron microprobe analyses shown for all analyzed particles in this group, the analyses are divided into three groups based on the observed extent of weathering in BSE images. The analytical points belonging to each group are shown in (A,B). (E–G) EDX maps for Pb, Si, and Ca of a Pb-silicate glass particle. The relative color intensity scale shows the element-rich (bright) and element-deficient (dark) parts of particles.

Figure 6.

Back-scattered electron images of minor phases occurring in the studied soils: (A) chalcopyrite with well-developed weathering features, the secondary products include Fe oxides with Mn and Co, and silicates, (B) chalcopyrite with thin weathered rim, (C) zircon breccia in Zr-rich glass, and (D) phosphate grain.
Back-scattered electron images of minor phases occurring in the studied soils: (A) chalcopyrite with well-developed weathering features, the secondary products include Fe oxides with Mn and Co, and silicates, (B) chalcopyrite with thin weathered rim, (C) zircon breccia in Zr-rich glass, and (D) phosphate grain.

Estimates of modal compositions of magnetic and non-magnetic fractions in two soil samples, based on analyses of approximately 300 individual particles_ Modal proportions are based on particle counting (one EDX data point per particle, a dominating phase in the particle was chosen for multi-phase particles)_ The last row shows the number of particles in which potentially toxic elements (PTE) were detected by EDX (Cu, Pb, Zn, Ni, Co, V)_ The Fe-oxide, Fe-oxide-mix, olivine, and glass were often found in multi-phase particles, but the exact number of these was not estimated_

L4L7
Non-magneticno. grains (percentage)
Apatite93 (44%)5 (2%)
Rutile47 (22%)53 (17%)
Zircon41 (19%)94 (30%)
Garnet7 (3%)2 (1%)
Dolomite7 (3%)0
Silicate glass6 (3%)12 (4%)
Pb-rich silicate glass4 (2%)0
Sulfide4 (2%)12 (4%)
Sphene4 (2%)3 (1%)
Epidote065 (20%)
Fe oxide-mix027 (8%)
Al-oxide021 (6%)
Amphibole/pyroxene022 (7%)
Total number of grains213316
Magnetic
Ti-Fe phase52 (18%)32 (8%)
Fe oxide-mix51 (18%)104 (27%)
Fe oxide37 (13%)75 (19%)
epidote35 (12%)8 (2%)
Fe-Mn phase24 (8%)0
garnet24 (8%)18 (5%)
silicate glass19 (7%)37 (10%)
olivine17 (6%)41 (11%)
amphibole/pyroxene15 (6%)40 (10%)
sulfide6 (2%)7 (2%)
chromite4 (1%)16 (4%)
Ca ferrite4 (1%)7 (2%)
Total number of grains288385
Phases with PTE20 (7%)46 (12%)

A review of previous studies on using heavy minerals in soil sciences_

Soil typeHeavy minerals studiedA scientific question targeted with heavy mineral analysesReferences
Unaffected soils
Podzolhornblende, hyperstene, magnetite, garnetSusceptibility of different minerals to weatheringMatelski and Turk (1947)
Acid forest soil profiles (pH 4–5), galciofluvial substrateapatite, titanite, hornblende, garnet, epidote, zirconDocumenting weathering trendsLång (2000)
Pre-tsunami soilspyroxene and amphibole group, opaque mineralsSoil erosion, provenance of detrital materialJagodziński et al. (2012)
Entisols and Aridisolsnon-opaque heavy minerals (zircon, tourmaline, rutile, garnet, sillimanite, and andalusite)Provenance of detrital materialSulieman et al. (2015)
Podzolapatite, amphibole, epidote, hematite, hornblende, garnet, monazite, olivine, pyrite, pyroxene, titanite, zircon, rutile, and ilmeniteDetermine if there is a significant contribution from these minerals to the surface geochemical signature, particularly radiogenic Pb of the soilsCarlson (2016)
Unspecifiedzircon, magnetite, ilmenite, rutile and monaziteMineral contribution to elevated contents of some elements in soils in ship-breaking yardsKhan et al. (2019)
Initial soilstransparent heavy-mineralsDocumenting weathering patterns and pedogenetic processes and the addition of allochthonous materialTangari et al. (2021)
Terra rosa represented by red palaeosol, red polygenetic soil, and two pedosedimentary complexesepidote and amphibole groupsThe provenance of initial soil material (origin of the parent material)Razum et al. (2023)
Soils affected by mining and smelting
The rhizosphere of industrial soils near Zn–Pb mines and metallurgical plants (Poland)Pb, Cd, Zn carbonates, As-Pb sulphosalts, polymineralic spherulesIdentification of processes in the rhizosphere leading to alteration and formation of secondary metal-rich phases, the importance of plant-root exudation solutions is stressedCabała, Teper (2007)
Industrial soils near mining and smelting areasSlag particles >1 mm in diameterEstablishing slag-derived dust as a main carrier of trace elements in studied soilsChopin and Alloway (2007)
Soils close to major smelter centers at Coppercliff, Coniston, and Falconbridge in the Sudbury area, CanadaSpherical particles composed of magnetite, hematite, Fe-silicates, sulfides, spinels, delafossite, and cuprite or tenoriteOrigin and potential alteration (e.g. dissolution rates and particle-soil interaction) of spherical particlesLanteigne et al. (2012)
Soil adjacent to mining areasParticulate matter such as Fe silicates, spinels, sulfides, NiO, and their weathering productsDistribution of metals and metalloids in particulate matter, their formation, weathering, and mobility in soilsLanteigne et al. (2014)
Soils within the protection zone of copper smelter (Poland)Diverse particles associated with mining and smeltingDetecting weathering reactions in the heavy particles, implications for metal mobilityTyszka et al. (2016)
Four different forest and grassland soils (site for the long-term experiment)Flue dust composed predominately of arsenolite As2O3Transformation of As-rich (>50 wt% As) copper smelter dust in the soil to understand As mobility and pollution risksJarošíková et al. (2018)
Soils developed on the slag heap after Zn–Pb smelting (Poland)Diverse particles associated with Zn–Pb smeltingEstimating modal proportions of primary to secondary phases using automated electron microscopyPietranik et al. (2018)
Topsoils from hot semi-dry area (Namibia)Diverse particles associated with mining and smeltingAutomated SEM used to understand the fate/binding of metal (loids) in soilsTuhý et al. (2020)
Biomass-rich savanna soils, semi-arid (Namibia)Ferric oxides, arsenolite, metal arsenates, As apatite, enargiteUnderstanding temperatures of mineralogical transformations and potentially toxic elements remobilization under wildfire conditions (laboratory combustion experiment)Tuhý et al. (2021)
Soils affected by Zn mining (Lanping Pb–Zn mine, China)Cadmium-bearing sphalerite and smithsoniteMobility and behavior of Cd and Zn derived from smithsonite and sphalerite and their transport mechanisms in soilsLi et al. (2022)
DOI: https://doi.org/10.2478/mipo-2024-0001 | Journal eISSN: 1899-8526 | Journal ISSN: 1899-8291
Language: English
Page range: 1 - 14
Submitted on: Sep 13, 2023
Accepted on: Dec 23, 2023
Published on: Feb 19, 2024
Published by: Mineralogical Society of Poland
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2024 Rafał Tyszka, Anna Pietranik, Beata Marciniak-Maliszewska, Jakub Kierczak, published by Mineralogical Society of Poland
This work is licensed under the Creative Commons Attribution 4.0 License.