期刊
JOURNAL OF PALEOLIMNOLOGY
卷 23, 期 2, 页码 165-174出版社
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1008049419623
关键词
lake sediments; magnetism; late Holocene; erosion; magnetotactic bacteria
The magnetic properties of recent sediments from five short cores from Brothers Water in the English Lake District are compared with those from a set of catchment soil samples. From the comparison, it is concluded that bacterial magnetosomes have made a significant contribution to the magnetic properties of the sediments of the last five decades. This contribution is superimposed on a continuing erosive input of haematite-rich sediment from the parent materials of the catchment and may obscure any possible increase in surface soil input during recent times. The results highlight the difficulty of making sediment-source linkages where biogenic contributions to the magnetic properties of the sediment are important relative to the input of magnetic minerals from catchment erosion.
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