Magnetic Data Essay - 1219 Words

3. DATA AND METHODOLOGY 3.1. Magnetic Data The used data are based on the reduced to pole (RTP) aeromagnetic data (Fig. 2) with contour interval of 20 nT, scale 1:250,000 (total field of the area is 41,400 nT, inclination angle is 37.4 degrees and declination angle is +1.6 degrees). The magnetic data was compiled for the Eastern Desert and the Red Sea, based on Meshref (1990) and available in Saad (1991). The Union Oil Company carried out this survey in 1974. Fig. (2): 3.2. Determination of the Curie point depth (CPD) Magnetic anomalies are produced by grouping the effects from both shallow and deep magnetic sources (Thà ©bault et al., 2010). Consequently, the RTP data contain high wavenumbers and low wavenumbers anomalies together. The†¦show more content†¦The centroid of the magnetic source Z0 can be estimated by fitting a straight line over the low-wavenumber portion of the radially averaged frequency-scaled power spectrum as shown in the flowing formula: †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ (2) Where D is a constant. Therefore, Zt and Z0 of the magnetic body can be determined. The basal depth (Zb) of any magnetic source can be resulted (Okubo et al., 1985; Tanaka et al., 1999) as: Zb= 2Z0-Zt†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.†¦Ã¢â‚¬ ¦.. (3) The obtained bottom depth (Zb) of the magnetic source is equivalent to the CPD. (Bhattacharyya and Leu 1975; Okubo et al. 1985). At Zb, Ferromagnetic minerals are loss their magnetization due to a temperature of about 580 º C. Spector and Grant (1970) generalized their energy power spectrum expression of the map by assuming that the anomalies of any magnetic map are come from a group of vertical magnetic prisms. Smith et al. (1974), Boler (1978) and Connard et al. (1983) applied the expression of this energy power spectrum to define the depth of the deepest magnetic layer. To link the CPD (Zb) with the Curie point isotherm (580 ºC), the vertical direction of temperature variation and the constant geothermal gradient were assumed. The geothermal gradient (dT/dZ) from the CPD (Zb) to the earth’s surface can be derived (Tanaka et al. 1999;Show MoreRelated John Dalton Biography Essay966 Words   |  4 Pagesnecessity of considering the beams of the aurora borealis of a ferruginous iron-like nature, because nothing else is known to be magnetic, and as a result, that there exists in the higher regions of the atmosphere an elastic fluid partaking of the properties of iron, or rather of magnetic steel, and that this fluid, doubtless from its magnetic property, assumes the form of cylindric beams. 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