Abstract
Continuous cores of sediment covering the period 13 000 yr BP to the present day have been collected for magnetic investigations from Lake Windermere using a pneumatically operated piston corer. The total remanent magnetization of one 6 metre core and six 1 metre cores has been measured using a computerized slow-speed spinner magnetometer. The stability of the remanence has been confirmed by alternating magnetic field tests and repeat measurements of the remanence. The magnetic mineral content of the sediments has been deduced from thermo-magnetic and rotational hysteresis studies. Low-temperature magnetic transition experiments on the NRM of the sediment shows that it least half of the remanence is carried by haematite. The inclinations of the magnetic vectors are consistently low. This is attributed to compaction of the sediment after deposition. The time variations of the geomagnetic field are discussed and their correlations with the results from the Lake Windermere sediments are indicated. A comparison is also made of the results from the Pleistocene Narita bed (Japan) with those from Lake Windermere.
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