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

大西洋中脊南部（南纬 32 度至 35 度）的岩石磁力和磁力反演研究

• 批准号: 9202099
• 负责人: Kenneth Macdonald
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1994-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9202099&HistoricalAwards=false
• 关键词: Rock; Magnetic; Inversion; Studies; SouthernMid

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.

中大西洋脊南纬31 ~ 35度的三维地磁倒转沿轴剖面显示，在三个相邻的扩展段中，中间部分磁化强度低，部分尖端磁化强度高。该项目将测量岩石的磁性，以确定计算出的轴向磁化强度在中段低、段尖高是由弱磁化源的地壳增厚、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，将解决假设的地幔柱在多大程度上抑制磁化振幅的问题，以及由于分异过程而强烈磁化的不连续面附近是缓慢扩散的中心。