Analysis of Relative Paleointensity Methods Applied to Deep-Sea Sediments

PI从布雷克外脊和百慕大隆起的高堆积率深海沉积物中恢复了详细的古地磁长期变化记录和相关的岩磁资料。他利用这些结果建立了一个相对的古强度记录。结果与最近对过去10万年的其他三个相对古强度估计相吻合。然而，相对古强度记录受环境影响较大（磁性组分粒度变化）。PI将开发新的相对古强度归一化方法，以更好地消除我们记录中的细微环境影响，并通过在人工和自然沉积物中进行不同场强和磁分数粒度的沉积物再沉积实验来验证这些方法。研究结果对深海和湖泊沉积物的相对古强度研究具有广泛的应用价值。

The PI has recovered detailed paleomagnetic secular variation records and associated rock magnetic data from high accumulation- rate deep-sea sediments of the Blake Outer Ridge and Bermuda Rise. He has used these results to develop a relative paleointensity record. Results correlate well with three other recent relative paleointensity estimates for the last 100,000 years. However, relative paleointensity record is strongly influenced by environmental effects (magnetic-fraction grain-size variations). The PI will develop new relative paleointensity normalization methods that will better remove subtle environmental effects in our records, and test these methods by sediment redeposition experiments which vary field intensity and magnetic-fraction grain size in both artificial and natural sediments. Results of this study will have broad application to relative paleointensity studies of both deep-sea and lacustrine sediments.