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XANES iron geochemistry in the mineral dust of the Talos Dome Ice Core (Antarctica) and the Southern Hemisphere potential source areas

DOI: 10.3390/condmat3040045 DOI Help

Authors: Valter Maggi (University of Milano-Bicocca; INFN Section of Milano-Bicocca; IGG-CNR) , Giovanni Baccolo (University of Milano-Bicocca; INFN Section of Milano-Bicocca; University of Siena) , Giannantonio Cibin (Diamond Light Source) , Barbara Delmonte (University of Milano-Bicocca) , Dariush Hampai (INFN-Laboratori Nazionali di Frascati) , Augusto Marcelli (INFN-Laboratori Nazionali di Frascati; RICMASS, Rome International Center for Materials Science Superstripes)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Condensed Matter , VOL 3

State: Published (Approved)
Published: December 2018
Diamond Proposal Number(s): 1984

Open Access Open Access

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.

Journal Keywords: mineral dust; XANES; paleoclimatology; ice cores; southern hemisphere

Subject Areas: Earth Science, Chemistry

Instruments: B18-Core EXAFS

Other Facilities: ESRF