Rock Magnetic and Magnetic Inversion Studies of the SouthernMid-Atlantic Ridge (32 Degrees-35 Degrees South)

大西洋中部海脊南纬31度至35度的三维磁反转的轴线剖面显示，中段的磁化强度较低，而相邻的三个扩展段的磁化强度较高。该项目将测量岩石的磁性，以确定计算的中段轴向磁化强度低和节段尖端高，是由于源磁化源较弱的地壳增厚、平均地壳厚度和磁场强度，还是正常磁化但地壳变薄造成的。利用岩石磁性数据和更精细的三维反演，将解决假设的地幔热柱在多大程度上抑制磁化幅度的问题，以及由于分馏过程而强烈磁化的不连续面附近的缓慢扩展中心的问题。

An along axis profile of 3-D magnetic inversions for the Mid- Atlantic Ridge 31 to 35 degrees south, show low magnetization at the mid-segments and high magnetizations at the segment tips for three adjacent spreading segments. The project will measure rock magnetic properties to determine if the calculated axial magnetization low at the mid-segment, and the segment tip highs, result from thickened crust with weakly magnetized sources, average crustal thickness and magnetic strength, or normal magnetization but thinned crust. With the rock magnetic data and the finer scale 3-D inversions, the questions of to what extent the hypothesized mantle plume depress magnetization amplitudes, and are slow spreading centers near discontinuities strongly magnetized because of fractionation processes, will be addressed.