Scalar aeromagnetic data reflect both induced and remanent magnetic fields. Induced magnetism is caused by the earth’s magnetic field and is mainly the result of the magnetic susceptibility of the rock. Magnetic susceptibility is expressed as a unit-less proportionality constant denoted by an International System of Units (SI), which simply reflects the susceptibility of a rock to become magnetized in the presence of a magnetic field. This susceptibility is mainly a function of the rock’s magnetite content. In general, higher susceptibility rocks produce greater variability in magnetic amplitudes than low-susceptibility counterparts (Ford et al., 2008; Anderson et al., 2013; Table 2).The remanent component is a function of the magnetic, mechanical, and thermal history of a rock and is not affected by the inducing magnetic field in which it is measured. In most cases, the induced component of the magnetic field is predominant. However, remanent magnetization is commonly dominant in igneous rocks (Anderson et al., 2013) which can result in strong negative polarization and subsequent negative amplitude magnetic lows.
Aeromagnetic data is collected at a resolution necessary to satisfy a specific survey objective (regional mapping vs. local mapping). Resolution is a function of flight line spacing and height above ground. High-resolution data comprises closely spaced flight lines near land surface and result in more detailed characterization of causative magnetic sources than data collected at wider flight-line spacing and higher altitudes. The strength of a magnetic field decreases as a function of the cube of the distance from a causative magnetic source. As a result, shallow sources are represented by sho...
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...he Quetico and Wabigoon subprovince and also continues on strike into Canada. The kinematic history of this structure has been summarized by Czeck and Poulsen (2010).
The geometry of regional faults suggests the OB occurs in a pressure shadow of a large sigma-shaped wedge of volcanoplutonic rocks and the kinematic sense for D2- D3 was dextral. This structural block, herein referred to as the Rainy River Block (RRB), strikes ~220 km EW and tapers from ~30 km thick in the central portion to less than 5 km at its edges. Internally, the RRB is cut by several NE trending faults or shear zones that are reminiscent of S-C fabric (Figure 5). The RRBs position between the Quetico terrane and rocks hosting the Rainy River gold deposit suggest is was deposited basin ward from the RRGD. Upward continuation filtering of magnetic data show that the large faults continue at depth.
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