Morphology of Reversal Transition Fields

反转跃迁场的形态

• 批准号: 9814965
• 负责人: Michael Fuller
• 金额: $ 4.53万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-15 至 2003-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814965&HistoricalAwards=false
• 关键词: Morphology; Reversal; Transition; Fields

9814965 Fuller The PI proposes to test the reliability of records of reversals from ODP advanced piston coring (APC) cores. This is an enormous potential reservoir of reversals records, but there have been repeated suggestions that these sediment records are anomalous and cannot be relied upon. The first target will be to test for radial overprints using comparison between off center samples and between archive and working half records of particular reversals. The second stage will be to look for overprints by testing for antipodality in normal and reversed sections close to reversals. Finally, the individual transitional samples will be subjected to AF and thermal demagnetization with principal component analysis. Anisotropy of susceptibility and anhysteretic remanence will be used to check against the confounding effect of magnetic fabric on the directions recorded. To determine relative intensity across the reversals, normalization will be by susceptibility, anhysteretic remanence and saturation isothernal remanence. The result of this work will be a set of documented tests of particular reversal records that can be widely used to assess the fidelity of ODP sediment records. The results will also bear upon the important question of the fidelity of relative intensity records from ODP cores.

9814965 Fuller PI建议测试ODP高级活塞取芯（APC）岩心反转记录的可靠性。 这是一个巨大的潜在的逆转记录库，但有反复的建议，这些沉积物记录是异常的，不能依赖。 第一个目标是通过比较偏离中心的样本以及特定反转的存档和工作半记录来测试径向叠印。 第二阶段将通过测试接近反转的正常和反转部分的对跖性来寻找叠印。 最后，个别过渡样品将进行AF和热退磁与主成分分析。 磁化率的各向异性和无磁滞剩磁将被用来检查磁组构对记录方向的混淆效应。 为了确定反转的相对强度，将通过磁化率、无滞后剩磁和饱和等温剩磁进行归一化。 这项工作的结果将是一套有文件记录的特定反转记录测试，可广泛用于评估ODP沉积物记录的保真度。 这些结果也将对ODP岩心相对强度记录的保真度这一重要问题产生影响。