Unconsolidated sediments contain magnetic minerals, such as those on the continental shelf and slope. These minerals are magnetised during formation. The remnant magnetism of the sediment is a reflection of the earths palaeomagnetic field at the time of deposition.
Dating Glacial Sediments - Antarctic Glaciers
Amino Acid Racemisation dates the decay and change in proteins in organisms such as shells. Optically Stimulated Luminescence dates the radiation accumulated in quartz or feldspar grains within sand. The radiation emanates from radioactive grains within the sediment, such as.
This information is vital for numerical models, and answers questions about how dynamic ice sheets are, and how responsive they are to changes in atmospheric and oceanic temperatures. Unfortunately, glacial sediments are typically difficult to date.
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Uranium-series uses the decay of uranium and thorium isotopes (238U, 235U and 232Th) in calcites in particular, such as stalactites and stalagmites in caves. Potassium-argon and argon-argon dating can be used to date the formation of volcanic rocks.
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