Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock
Drill cuttings were collected at 1 m depths from an instrumented, low sulfur, experimental waste rock pile containing a 4C-pyrrhotite that had been exposed to the extreme freeze-thaw cycle of a tundra climate. Boreholes were drilled from the top to base in the center of the pile and near the core-ba...
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Online Access: | https://ir.library.carleton.ca/pub/10493 https://doi.org/10.1016/j.apgeochem.2016.11.010 |
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ftcarletonunivir:oai:carleton.ca:10493 2023-05-15T17:58:13+02:00 Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock Langman, J.B. (Jeff B.) Blowes, D.W. (David W.) Amos, R. (Richard) Atherton, C. (Colleen) Wilson, D. (David) Smith, L. (Leslie) Sego, D.C. (David C.) Sinclair, S.A. (Sean A.) 2017-01-01 https://ir.library.carleton.ca/pub/10493 https://doi.org/10.1016/j.apgeochem.2016.11.010 en eng https://ir.library.carleton.ca/pub/10493 doi:10.1016/j.apgeochem.2016.11.010 Applied Geochemistry vol. 76, pp. 9-21 Differential weathering Enrichment zone Freeze-thaw cycle Metal leaching Sulfide oxidation info:eu-repo/semantics/article 2017 ftcarletonunivir https://doi.org/10.1016/j.apgeochem.2016.11.010 2022-02-06T21:48:58Z Drill cuttings were collected at 1 m depths from an instrumented, low sulfur, experimental waste rock pile containing a 4C-pyrrhotite that had been exposed to the extreme freeze-thaw cycle of a tundra climate. Boreholes were drilled from the top to base in the center of the pile and near the core-batter transition. Waste rock samples were analyzed for carbon, sulfur, and metal concentrations; sulfur oxidation states; and variation in iron and nickel forms due to oxidative dissolution of pyrrhotite. Results from X-ray absorption spectroscopy and aqueous extraction experiments were used to relatively compare samples from various depths in the boreholes, which indicate sulfide weathering fronts that decrease in intensity from the top to core to base at the center of the pile and from the core-batter transition to the center of the pile. The tundra climate and waste pile configuration produce a permafrost base, a seasonally frozen core, and an atmospheric-like zone near the surface. The fluctuation of the freeze-thaw cycle caused the greatest sulfide weathering near the surface and lesser weathering in the core and base of the pile. Metal- and sulfur-rich leachate from the higher weathering zone likely is collecting on a variable and seasonal frozen surface beneath the surface layer that causes metals and S to precipitate and (or) sorb during a portion of the year. The accumulation of sulfur and metals with the flux of this frozen surface produces a nickel and possibly an iron and sulfur enrichment zone beneath the surface layer in the center of the pile. The weathering front from the top to core to base of the pile and from core-batter transition to the core corresponds to a previously formulated leachate model, but the enrichment zone below the surface zone is unique to this conceptual waste-rock weathering model for this tundra climate. Article in Journal/Newspaper permafrost Tundra Carleton University's Institutional Repository Rock Pile ENVELOPE(-65.167,-65.167,-68.417,-68.417) Applied Geochemistry 76 9 21 |
institution |
Open Polar |
collection |
Carleton University's Institutional Repository |
op_collection_id |
ftcarletonunivir |
language |
English |
topic |
Differential weathering Enrichment zone Freeze-thaw cycle Metal leaching Sulfide oxidation |
spellingShingle |
Differential weathering Enrichment zone Freeze-thaw cycle Metal leaching Sulfide oxidation Langman, J.B. (Jeff B.) Blowes, D.W. (David W.) Amos, R. (Richard) Atherton, C. (Colleen) Wilson, D. (David) Smith, L. (Leslie) Sego, D.C. (David C.) Sinclair, S.A. (Sean A.) Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock |
topic_facet |
Differential weathering Enrichment zone Freeze-thaw cycle Metal leaching Sulfide oxidation |
description |
Drill cuttings were collected at 1 m depths from an instrumented, low sulfur, experimental waste rock pile containing a 4C-pyrrhotite that had been exposed to the extreme freeze-thaw cycle of a tundra climate. Boreholes were drilled from the top to base in the center of the pile and near the core-batter transition. Waste rock samples were analyzed for carbon, sulfur, and metal concentrations; sulfur oxidation states; and variation in iron and nickel forms due to oxidative dissolution of pyrrhotite. Results from X-ray absorption spectroscopy and aqueous extraction experiments were used to relatively compare samples from various depths in the boreholes, which indicate sulfide weathering fronts that decrease in intensity from the top to core to base at the center of the pile and from the core-batter transition to the center of the pile. The tundra climate and waste pile configuration produce a permafrost base, a seasonally frozen core, and an atmospheric-like zone near the surface. The fluctuation of the freeze-thaw cycle caused the greatest sulfide weathering near the surface and lesser weathering in the core and base of the pile. Metal- and sulfur-rich leachate from the higher weathering zone likely is collecting on a variable and seasonal frozen surface beneath the surface layer that causes metals and S to precipitate and (or) sorb during a portion of the year. The accumulation of sulfur and metals with the flux of this frozen surface produces a nickel and possibly an iron and sulfur enrichment zone beneath the surface layer in the center of the pile. The weathering front from the top to core to base of the pile and from core-batter transition to the core corresponds to a previously formulated leachate model, but the enrichment zone below the surface zone is unique to this conceptual waste-rock weathering model for this tundra climate. |
format |
Article in Journal/Newspaper |
author |
Langman, J.B. (Jeff B.) Blowes, D.W. (David W.) Amos, R. (Richard) Atherton, C. (Colleen) Wilson, D. (David) Smith, L. (Leslie) Sego, D.C. (David C.) Sinclair, S.A. (Sean A.) |
author_facet |
Langman, J.B. (Jeff B.) Blowes, D.W. (David W.) Amos, R. (Richard) Atherton, C. (Colleen) Wilson, D. (David) Smith, L. (Leslie) Sego, D.C. (David C.) Sinclair, S.A. (Sean A.) |
author_sort |
Langman, J.B. (Jeff B.) |
title |
Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock |
title_short |
Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock |
title_full |
Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock |
title_fullStr |
Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock |
title_full_unstemmed |
Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock |
title_sort |
influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock |
publishDate |
2017 |
url |
https://ir.library.carleton.ca/pub/10493 https://doi.org/10.1016/j.apgeochem.2016.11.010 |
long_lat |
ENVELOPE(-65.167,-65.167,-68.417,-68.417) |
geographic |
Rock Pile |
geographic_facet |
Rock Pile |
genre |
permafrost Tundra |
genre_facet |
permafrost Tundra |
op_source |
Applied Geochemistry vol. 76, pp. 9-21 |
op_relation |
https://ir.library.carleton.ca/pub/10493 doi:10.1016/j.apgeochem.2016.11.010 |
op_doi |
https://doi.org/10.1016/j.apgeochem.2016.11.010 |
container_title |
Applied Geochemistry |
container_volume |
76 |
container_start_page |
9 |
op_container_end_page |
21 |
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1766166777939623936 |