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DC Field | Value | Language |
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dc.contributor.advisor | Borradaile, Graham J. | - |
dc.contributor.author | Almqvist, Bjarne Sven Gustav | - |
dc.date.accessioned | 2016-08-11T17:32:29Z | - |
dc.date.available | 2016-08-11T17:32:29Z | - |
dc.date.issued | 2006 | - |
dc.identifier.uri | http://knowledgecommons.lakeheadu.ca/handle/2453/737 | - |
dc.description.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. | en_US |
dc.language.iso | en_US | en_US |
dc.subject | Regional geology of northwestern Ontario | en_US |
dc.subject | Rock magnetism | en_US |
dc.subject | Paleomagnetism | en_US |
dc.title | Paleomagnetic secular field variation and rock magnetism of some early holocene (<9900BP) postglacial lacustrine sediments near Thunder Bay, Northwestern Ontario, Canada | en_US |
dc.type | Thesis | - |
etd.degree.name | M.Sc. | en_US |
etd.degree.level | Master | en_US |
etd.degree.discipline | Geology | en_US |
etd.degree.grantor | Lakehead University | en_US |
Appears in Collections: | Retrospective theses |
Files in This Item:
File | Description | Size | Format | |
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AlmqvistB2006m-1b.pdf | 14.11 MB | Adobe PDF | View/Open |
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