کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6430368 | 1634787 | 2013 | 14 صفحه PDF | دانلود رایگان |
Magnetotactic bacteria (MTB) are known to biosynthesise single-domain magnetite (Fe3O4) for geomagnetic navigation and their relict magnetosomes (called magnetofossils) can control the magnetic properties of lake and marine sediments. Magnetotactic bacteria also produce greigite (Fe3S4) magnetosomes but, compared to those made of magnetite, relatively little is known about the sedimentary environments where they are produced and the magnetic properties of the preserved particles. We studied the magnetic properties of sediment cores from two basins (the North Central Baltic Proper and eastern Gotland Basin) that currently experience hypoxia and we discovered the magnetic enhancement of older laminated sapropels, which are a signal of past occurrences of anoxia and hypoxia in the Baltic Sea. Magnetic concentrates extracted from the laminated sapropels were characterised by transmission electron microscopy and energy dispersive X-ray spectrometry and we identified only single-domain greigite (Fe3S4) particles with a mean size of 55Ã75Â nm, which we interpret as magnetofossils due to diagnostic chains of individual particles separated by an intact dividing membrane. The degree of magnetic enhancement in the laminated sapropels has a positive relationship with loss-on-ignition data, which indicates a link between the production of greigite magnetosomes, organic matter supply and preservation and redox conditions. The coercive force of collections of non-interacting greigite magnetofossils is â¼13Â mT, which is considerably lower than the magnetite counterparts (â¼30Â mT) and strictly non-bacterial and larger greigite single-domain grains (â¼60Â mT). The values of the interparametric ratios of SIRM/Ï, ÏARM/SIRM and ÏARM/Ï that we obtain for our greigite magnetofossils overlap with those previously considered to be diagnostic of magnetosomal magnetite. The presence of bacterial greigite, which is easily detected by magnetic measurements, forms a proxy for hypoxia and anoxia, thus aiding the palaeoenvironmental interpretation of how oxygen conditions in the Baltic Sea have changed over time.
⺠Laminated sapropels in the Baltic Sea are magnetically enhanced. ⺠Enhancement is due to single-domain greigite crystals with a mean size of 55Ã75 nm. ⺠The greigite particles are interpreted as fossil magnetosomes. ⺠The greigite magnetosomes have a coercive force of â¼13 mT. ⺠Concentration of magnetofossils is positively linked to organic matter supply.
Journal: Earth and Planetary Science Letters - Volume 366, 15 March 2013, Pages 137-150