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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)

DOI: 10.3390/condmat3030025 DOI Help

Authors: Giovanni Baccolo (University Milano-Bicocca; Istituto Nazionale di Fisica Nucleare) , Giannantonio Cibin (Diamond Light Source) , Barbara Delmonte (University Milano-Bicocca) , Dariush Hampai (Istituto Nazionale di Fisica Nucleare) , Augusto Marcelli (Istituto Nazionale di Fisica Nucleare; Rome International Center for Materials Science Superstripes (RICMASS)) , Elena Di Stefano (University Milano-Bicocca; Istituto Nazionale di Fisica Nucleare; University of Siena) , Salvatore Macis (Istituto Nazionale di Fisica Nucleare; University Roma-Tor Vergata) , Valter Maggi (University Milano-Bicocca; Istituto Nazionale di Fisica Nucleare)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Condensed Matter , VOL 3

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

Open Access Open Access

Abstract: The possibility of finding a stratigraphically intact ice sequence with a potential basal age exceeding one million years in Antarctica is giving renewed interest to deep ice coring operations. But the older and deeper the ice, the more impactful are the post-depositional processes that alter and modify the information entrapped within ice layers. Understanding in situ post-depositional processes occurring in the deeper part of ice cores is essential to comprehend how the climatic signals are preserved in deep ice, and consequently how to construct the paleoclimatic records. New techniques and new interpretative tools are required for these purposes. In this respect, the application of synchrotron light to microgram-sized atmospheric dust samples extracted from deep ice cores is extremely promising. We present here preliminary results on two sets of samples retrieved from the Talos Dome Antarctic ice core. A first set is composed by samples from the stratigraphically intact upper part of the core, the second by samples retrieved from the deeper part of the core that is still undated. Two techniques based on synchrotron light allowed us to characterize the dust samples, showing that mineral particles entrapped in the deepest ice layers display altered elemental composition and anomalies concerning iron geochemistry, besides being affected by inter-particle aggregation.

Journal Keywords: atmospheric mineral dust; ice core; Antarctica; paleoclimate; synchrotron radiation; X-ray absorption near edge spectroscopy; X-ray fluorescence; iron geochemistry

Subject Areas: Earth Science

Instruments: B18-Core EXAFS

Added On: 05/09/2018 11:56

Discipline Tags:

Earth Sciences & Environment Atmospheric Processes Geology Geochemistry

Technical Tags:

Imaging Spectroscopy X-ray Fluorescence (XRF) X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)