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 the Talos Dome ice core (TALDICE, Ross Sea sector of East Antarctica) displays evident and progressive signs of post-depositional processes affecting the mineral dust record below 1...
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ftcopernicus:oai:publications.copernicus.org:tc94853 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 2021-10-12 application/pdf https://doi.org/10.5194/tc-15-4807-2021 https://tc.copernicus.org/articles/15/4807/2021/ eng eng doi:10.5194/tc-15-4807-2021 https://tc.copernicus.org/articles/15/4807/2021/ eISSN: 1994-0424 Text 2021 ftcopernicus https://doi.org/10.5194/tc-15-4807-2021 2021-10-18T16:22:31Z Thanks to its insolubility, mineral dust is considered a stable proxy in polar ice cores. With this study we show that the Talos Dome ice core (TALDICE, Ross Sea sector of East Antarctica) displays evident and progressive signs of post-depositional processes affecting the mineral dust record below 1000 m deep. We apply a suite of established and cutting-edge techniques to investigate the properties of dust in TALDICE, 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, affecting primitive dust 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. 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 help in exploring 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) The Cryosphere 15 10 4807 4822 |
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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 the Talos Dome ice core (TALDICE, Ross Sea sector of East Antarctica) displays evident and progressive signs of post-depositional processes affecting the mineral dust record below 1000 m deep. We apply a suite of established and cutting-edge techniques to investigate the properties of dust in TALDICE, 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, affecting primitive dust 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. 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 help in exploring 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-15-4807-2021 https://tc.copernicus.org/articles/15/4807/2021/ |
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-15-4807-2021 https://tc.copernicus.org/articles/15/4807/2021/ |
op_doi |
https://doi.org/10.5194/tc-15-4807-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
10 |
container_start_page |
4807 |
op_container_end_page |
4822 |
_version_ |
1766272467395936256 |