Deep ice as a geochemical reactor: insights from iron speciation and mineralogy of dust in the Talos Dome ice core (East Antarctica)
-
Published:2021-10-12
Issue:10
Volume:15
Page:4807-4822
-
ISSN:1994-0424
-
Container-title:The Cryosphere
-
language:en
-
Short-container-title:The Cryosphere
Author:
Baccolo GiovanniORCID, Delmonte Barbara, Di Stefano Elena, Cibin Giannantonio, Crotti Ilaria, Frezzotti MassimoORCID, Hampai Dariush, Iizuka Yoshinori, Marcelli Augusto, Maggi ValterORCID
Abstract
Abstract. 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.
Funder
Ministero dell’Istruzione, dell’Università e della Ricerca Horizon 2020 Diamond Light Source
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference89 articles.
1. Albani, S., Delmonte, B., Maggi, V., Baroni, C., Petit, J.-R., Stenni, B., Mazzola, C., and Frezzotti, M.: Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales, Clim. Past, 8, 741–750, https://doi.org/10.5194/cp-8-741-2012, 2012a. 2. Albani, S., Mahowald, N. M., Delmonte, B.,Maggi, V., and Winckler, G.: Comparing modeled and observed changes in mineral dust transport and deposition to Antarctica between the Last Glacial Maximum and current
climates, Clim. Dynam., 38, 1731–1755, 2012b. 3. Aubry, L., Roperch, P., de Urreiztieta, M., Rossello, E., and Chauvin, A.:
Paleomagnetic study along the southeastern edge of the Altiplano- Puna Plateau: Neogene tectonic rotations, J. Geophys. Res.-Solid, 101, 17833–17899, 1996. 4. Baccolo, G., Cibin, G., Delmonte, B., Hampai, D., Marcelli, A., Di Stefano,
E., Macis, S., and Maggi, V.: The contribution of synchrotron light for the
characterization of atmospheric mineral dust in deep ice cores: preliminary
results from the talos dome ice core (east antarctica), Condens. Matter, 3,
25, https://doi.org/10.3390/condmat3030025, 2018a. 5. Baccolo, G., Delmonte, B., Albani, S., Baroni, C., Cibin, G., Frezzotti, M.,
Hampai, D., Marcelli, A., Revel, M., Salvatore, M., Stenni, B., and Maggi, V.: Regionalization of the atmospheric dust cycle on the periphery of the East Antarctic ice sheet since the last glacial maximum, Geochem. Geophy. Geosy., 19, 3540–3554, 2018b.
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|