Title

Magnetic susceptibility mapping of Point Pelee National Park beaches.

Date of Award

2005

Degree Type

Thesis

Degree Name

M.Sc.

Department

Geology

Keywords

Geophysics.

Rights

CC BY-NC-ND 4.0

Abstract

In the preliminary studies, the western and the Eastern shores of Point Pelee National Park (PPNP) showed a distinct spatial variation in their sediment magnetic properties (magnetic susceptibility). In order to determine the degree of spatial variability of field magnetic susceptibility and potential causes, the magnetic susceptibility of the beach sands were mapped in transects perpendicular to the shoreline of Lake Erie with a Bartington susceptibility meter. The West beaches showed no significant variation in susceptibility measurements, the East beaches showed highly variable susceptibility values which tended to increase towards the vegetation line. The East beaches magnetic susceptibility varied from 68*10-6 to 9000*10-6 (SI units), the West beaches were in the low range of 14*10-6 to 243.5*10-6. Magnetic susceptibility values were analysed and displayed with ARCGIS. Mineral magnetic analysis (anhysteretic remanence and saturation isothermal remanence measurements as well as temperature dependence of susceptibility measurements) indicated that the primary magnetic mineral throughout the Point Pelee beaches is pseudo single domain to single domain magnetite. Some variation in composition is apparent. Similar compositions and grainsize were observed to the north east of PPNP, on the Rondeau Provincial Park beaches and Wheatley beaches, suggesting either the same source or a similar sediment source. The temporal variations in susceptibility distribution, as well as high surface magnetic susceptibility due to the presence of magnetite-rich lamina suggest that sediment sorting and other beach processes is likely to cause the high magnetite concentration on the East beaches.Dept. of Earth Sciences. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2005 .I33. Source: Masters Abstracts International, Volume: 44-03, page: 1312. Thesis (M.Sc.)--University of Windsor (Canada), 2005.