Analysis of Relative Paleointensity Methods Applied to Deep-Sea Sediments

PI已经恢复了详细的古地磁长期变化 记录和相关的岩石磁性数据从高积累- 布莱克外脊和百慕大海隆的深海沉积物。 他利用这些结果发展了一个相对的古地震强度 记录 结果与其他三个最近的相对 过去10万年的古地震强度估计。 但是，在这方面， 相对古强度记录受 环境影响（磁性分数粒度变化）。 PI将开发新的相对古强度标准化 方法，将更好地消除微妙的环境影响， 记录，并通过沉积物再沉积测试这些方法 磁场强度和磁粒率变化实验 在人工和自然沉积物中。 成果 研究将对相对古强度有广泛应用 深海和湖泊沉积物的研究。

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.