Magnetic measurements of Greenland and Himalayan ice-core samples

• Published in: The Holocene
• Main Authors: Sahota, J, Mayewski, P, Oldfield, F, al., E
• Format: Article in Journal/Newspaper
• Language: English
• Published: SAGE Publications 2019
• Subjects: Greenland; glacier; ice core; Ice Sheet
• Online Access: https://doi.org/10.1177/095968369600600411; https://ora.ox.ac.uk/objects/uuid:996bd367-a61d-4874-8291-93736d209a6f

This paper summarizes Isothermal Remanence (IRM300mT) measurements from Holocene ice-core samples from two contrasting glaciological regimes: (i) the Greenland ice sheet and (ii) a Himalayan glacier. Cores had been previously characterized in terms of chronologies, geochemistry and, for the Himalayan core, microparticle concentrations. Six samples from the Greenland 20-D ice core from the time period AD 1876-1983 did not yield magnetic measurements above instrumental noise-level. Significant Isothermal Remanence measurements (IRM300mT) were obtained from some levels in the Himalayan ice core. Scanning electron microscopy and EDAX analyses indicate weathered crustal material. The techniques used require ice-core samples with relatively high dust loadings and/or larger volume ice samples.