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在马尼托Lac du Bonnet岩基进行岩石物理参数(体积磁化率、磁各向异性、天然剩余磁化强度)的测量,用来描述岩石的岩性特征。钻了5个钻孔,共进尺2.8Km。确立了岩芯的磁化率与岩性之间的关系。磁化率值与岩性特征对应为:低磁化率(0～5×10~(-3)SI)为断裂带(开口断裂和闭合断裂)并伴生蚀变岩石;中等磁化率值(7～10×10~(-3)SI)对应于无蚀变及无断裂的均质岩石;高磁化率(20～100×10~(-3)SI)兼有低磁化率(0～5×10~(-3)SJ)区是非均质的岩石,如含镁铁质矿物的捕虏体。通过钻孔间的对比,在UKL-1,-5,-3岩芯上确定了两个无间断的主断裂带,这与利用地震反射资料确定的断裂带相吻合。磁各向异性与岩石组构有关。剩磁测量没有得到稳定的磁方向。火成岩的磁性测量是确定岩体特征的一个有效方法。
Rock physics parameters (volumetric susceptibility, magnetic anisotropy, natural residual magnetization) are measured at the Lac du Bonnet foundation in Manitow to characterize the lithology of the rock. Drilled five holes, a total footage of 2.8Km. Established the relationship between core magnetic susceptibility and lithology. The values of magnetic susceptibility and lithology are as follows: the low susceptibility (0 ~ 5 × 10 -3 SI) is the fault zone (open fracture and closed fracture) accompanied by altered rocks; the medium susceptibility (7-10 × 10 ~ (-3) SI) corresponds to the non-altered and non-fractured homogenous rocks. The high susceptibility (20 ~ 100 × 10 -3 SI) has low magnetic susceptibility (0 ~ 5 × 10 ~ (-3) SJ) are heterogeneous rocks, such as xenoliths containing mafic minerals. By contrasting between boreholes, two unbroken main fault zones were identified on cores UKL-1, -5, -3, consistent with the fault zone determined by seismic reflection data. Magnetic anisotropy is related to rock fabric. Remaining magnetic measurement did not get a stable magnetic direction. Magmatic measurement of igneous rock is an effective method to determine the characteristics of rock mass.