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Condens. Matter 2018, 3(4), 45; https://doi.org/10.3390/condmat3040045

XANES Iron Geochemistry in the Mineral Dust of the Talos Dome Ice Core (Antarctica) and the Southern Hemisphere Potential Source Areas

1
Department of Earth and Environmental Sciences, University of Milano-Bicocca, 20126 Milano, Italy
2
INFN Section of Milano-Bicocca, 20126 Milano, Italy
3
IGG-CNR, 56100 Pisa, Italy
4
Graduate school in Polar Sciences, University of Siena, 53100 Siena, Italy
5
Diamond Light Source, Didcot OX11 0AB, UK
6
INFN-Laboratori Nazionali di Frascati, Via Enrico Fermi 40, 00044 Frascati, Italy
7
RICMASS, Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
Received: 27 June 2018 / Revised: 2 November 2018 / Accepted: 22 November 2018 / Published: 6 December 2018
(This article belongs to the Special Issue Condensed Matter Researches in Cryospheric Science)
Full-Text   |   PDF [3605 KB, uploaded 6 December 2018]   |  

Abstract

X-ray absorption near edge structure (XANES) measurements at the Fe K-edge were performed on aeolian dust in the TALos Dome Ice CorE drilling project (TALDICE) ice core drilled in the peripheral East Antarctic plateau, as well as on Southern Hemisphere potential source area samples. While South American sources show, as expected, a progressive increase in Fe oxidation with decreasing latitude, Antarctic sources show Fe oxidation levels higher than expected in such a cold polar environment, probably because of their very high exposure ages. Results from the TALDICE dust samples are compatible with a South American influence at the site during MIS2 (marine isotopic stage 2, the last and coldest phase of the last glacial period), in particular from Patagonia and Tierra del Fuego. However, a contribution from Australia and/or local Antarctic sources cannot be ruled out. Finally, important changes also occurred during the deglaciation and in the Holocene, when the influence of Antarctic local sources seems to have become progressively more important in recent times. This research is the first successful attempt to extract temporal climatic information from X-ray absorption spectroscopic data of the insoluble mineral dust particles contained in an ice core and shows the high potential of this technique. View Full-Text
Keywords: mineral dust; XANES; paleoclimatology; ice cores; southern hemisphere mineral dust; XANES; paleoclimatology; ice cores; southern hemisphere
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Maggi, V.; Baccolo, G.; Cibin, G.; Delmonte, B.; Hampai, D.; Marcelli, A. XANES Iron Geochemistry in the Mineral Dust of the Talos Dome Ice Core (Antarctica) and the Southern Hemisphere Potential Source Areas. Condens. Matter 2018, 3, 45.

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