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The abundance of magnetic minerals in all dust samples was estimated from measurements of magnetic susceptibility (expressed as mass normalized SI value) and isothermal remanent magnetization (IRM). The graphs to the right show magnetic susceptibility values for all sampling stations, averaged over the entire sampling period for each station(Fig. 2a), magnetic susceptibility for a year of high dust production (1993) and a year of low dust production (1997) (Fig. 2b) and IRM values for 1993 and 1997 (Fig. 2c).
Owens (dry) Lake dust (station T62) has extremely low concentrations of magnetic minerals, which is reflected both in low values of magnetic susceptibility and IRM. Sampling stations in Owens Valley (T63 - T64) register an increased dilution with strongly magnetic dust with increasing distance from Owens (dry) Lake. There is no good correlation of concentration of magnetic minerals and distance from Owens (dry) Lake beyond the llimits of Owens Valley. |
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