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The Holocene
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Magnetic measurements of Greenland and Himalayan ice-core samples

J.T.S. Sahota

Department of Geography, University of Liverpool, Liverpool, L69 3BX, UK

P.A. Mayewski

Climate Change Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH 03824, USA

F. Oldfield

Department of Geography, University of Liverpool, Liverpool, L69 3BX, UK

M.S. Twickler

Climate Change Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH 03824, USA

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.

Key Words: Ice cores • magnetic measurements • dust loadings • Greenland • Himalaya.

The Holocene, Vol. 6, No. 4, 477-480 (1996)
DOI: 10.1177/095968369600600411
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