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    paleomagnetic secular field variation and rock magnetism of some early holocene (<9900bp) postglacial lacustrine sediments near thunder bay, northwestern ontario, canada

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    almqvistb2006m-1b.pdf (13.77mb)
    date
    2006
    author
    almqvist, bjarne sven gustav
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    abstract
    paleosecular magnetic changes through a 1.5m section of post-glacial lacustrine deposits are strongly influenced by mineralogy and differential compaction. the sediments chiefly comprise clay and, in the lower one third part of the section, rhythmites which vary from ~2mm to ~scm in thickness. 125 paleomagnetic specimens were collected in total from the 1.5m section. anisotropy of magnetic susceptibility and anisotropy of anhysteretic remanent magnetization identify a magnetic fabric with maximum susceptibility parallel to the bedding plane of the sediments and with a preferred northwest-southeast axis, probably indicating paleo-current alignment. minimum susceptibility represents the pole to bedding, due to grain alignment. incremental acquisition and demagnetization of isothermal and anhysteretic magnetizations and the orthogonal three-axis test indicate that the sediments contain two magnetic phases with different coercivities. magnetic hysteresis measurements (clays n=226; silts n=37) show that clay is dominated by single domain magnetite and hematite (means of m5=58.47±9.22am2 , mrs=17.12±27.22am2 , hc=21.09±7.69mt, hcr=62.04±4.09mt) whereas silt is dominated by pseudo-single domain and single domain magnetite (means of m5=681.0±395.9am2 , mrs=163.2±84.75am2 , hc=26.07±2.94mt, hcr=56.08±3.17mt). the silt is dominated by magnetite, whereas the clay carries both hematite and magnetite.
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    http://knowledgecommons.lakeheadu.ca/handle/2453/737
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