Icebergs and their "ice-rafted detritus"
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A source for volcanic glass in Iceland. This is the head of a fjord with basalt created by one of Iceland's many volcanic eruptions. When this fjord again becomes glaciated, the bergs that break off and float out to sea will be laden with volcanic debris.(Photo Rusty Lotti Bond, Deep-Sea Sample Repository, Lamont-Doherty Earth Observatory)
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Left: after a glacier has built up and chunks begin to break off and float out to sea. Right: A close-up where you can see the debris entrained in the iceberg. This debris will be different in icebergs from different places.(Photos Tom Lowell, Institute of Glacial Geology, University of Cincinnati)
The next map will illustrate the locations of cores found containing two petrologic markers we trace in the sediment -- basaltic glass and hematite-stained grains.
For more information, contact Rusty Lotti Bond
(curator@ldeo.columbia.edu). Comments are welcomed. Last update of this page was January 20, 2001.
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