Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica)
Thanks to its insolubility, mineral dust is considered a stable proxy in polar ice cores. With this study we show that below an ice-depth of 1000 m, the Talos Dome ice core (Ross Sea sector of East Antarctica) presents evident and progressive signs of post-depositional processes affecting the minera...
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ftcopernicus:oai:publications.copernicus.org:tcd94853 2023-05-15T14:02:17+02:00 Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica) Baccolo, Giovanni Delmonte, Barbara Stefano, Elena Cibin, Giannantonio Crotti, Ilaria Frezzotti, Massimo Hampai, Dariush Iizuka, Yoshinori Marcelli, Augusto Maggi, Valter 2021-06-29 application/pdf https://doi.org/10.5194/tc-2021-162 https://tc.copernicus.org/preprints/tc-2021-162/ eng eng doi:10.5194/tc-2021-162 https://tc.copernicus.org/preprints/tc-2021-162/ eISSN: 1994-0424 Text 2021 ftcopernicus https://doi.org/10.5194/tc-2021-162 2021-07-05T16:22:15Z Thanks to its insolubility, mineral dust is considered a stable proxy in polar ice cores. With this study we show that below an ice-depth of 1000 m, the Talos Dome ice core (Ross Sea sector of East Antarctica) presents evident and progressive signs of post-depositional processes affecting the mineral dust records. We applied a suite of established and cutting edge techniques to investigate the properties of dust present in the Talos Dome ice core, ranging from concentration and grain-size to elemental-composition and Fe-mineralogy. Results show that through acidic/oxidative weathering, the conditions of deep ice at Talos Dome promote the dissolution of specific minerals and the englacial formation of others, deeply affecting dust primitive features. The expulsion of acidic atmospheric species from ice-grains and their concentration in localized environments is likely the main process responsible for englacial reactions and is related with ice re-crystallization. Deep ice can be seen as a "geochemical reactor" capable of fostering complex reactions which involve both soluble and insoluble impurities. Fe-bearing minerals can efficiently be used to explore such transformations. Text Antarc* Antarctica East Antarctica ice core Ross Sea Copernicus Publications: E-Journals East Antarctica Ross Sea Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Thanks to its insolubility, mineral dust is considered a stable proxy in polar ice cores. With this study we show that below an ice-depth of 1000 m, the Talos Dome ice core (Ross Sea sector of East Antarctica) presents evident and progressive signs of post-depositional processes affecting the mineral dust records. We applied a suite of established and cutting edge techniques to investigate the properties of dust present in the Talos Dome ice core, ranging from concentration and grain-size to elemental-composition and Fe-mineralogy. Results show that through acidic/oxidative weathering, the conditions of deep ice at Talos Dome promote the dissolution of specific minerals and the englacial formation of others, deeply affecting dust primitive features. The expulsion of acidic atmospheric species from ice-grains and their concentration in localized environments is likely the main process responsible for englacial reactions and is related with ice re-crystallization. Deep ice can be seen as a "geochemical reactor" capable of fostering complex reactions which involve both soluble and insoluble impurities. Fe-bearing minerals can efficiently be used to explore such transformations. |
format |
Text |
author |
Baccolo, Giovanni Delmonte, Barbara Stefano, Elena Cibin, Giannantonio Crotti, Ilaria Frezzotti, Massimo Hampai, Dariush Iizuka, Yoshinori Marcelli, Augusto Maggi, Valter |
spellingShingle |
Baccolo, Giovanni Delmonte, Barbara Stefano, Elena Cibin, Giannantonio Crotti, Ilaria Frezzotti, Massimo Hampai, Dariush Iizuka, Yoshinori Marcelli, Augusto Maggi, Valter Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica) |
author_facet |
Baccolo, Giovanni Delmonte, Barbara Stefano, Elena Cibin, Giannantonio Crotti, Ilaria Frezzotti, Massimo Hampai, Dariush Iizuka, Yoshinori Marcelli, Augusto Maggi, Valter |
author_sort |
Baccolo, Giovanni |
title |
Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica) |
title_short |
Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica) |
title_full |
Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica) |
title_fullStr |
Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica) |
title_full_unstemmed |
Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica) |
title_sort |
deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the talos dome ice core (east antarctica) |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-2021-162 https://tc.copernicus.org/preprints/tc-2021-162/ |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) |
geographic |
East Antarctica Ross Sea Talos Dome |
geographic_facet |
East Antarctica Ross Sea Talos Dome |
genre |
Antarc* Antarctica East Antarctica ice core Ross Sea |
genre_facet |
Antarc* Antarctica East Antarctica ice core Ross Sea |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2021-162 https://tc.copernicus.org/preprints/tc-2021-162/ |
op_doi |
https://doi.org/10.5194/tc-2021-162 |
_version_ |
1766272447782322176 |