Understanding magnetic remanence acquisition in sediments through a combined experimental and numerical approach

通过实验和数值相结合的方法了解沉积物中剩磁的采集

• 批准号: 98959802
• 负责人: Professor Dr. Stuart Alan Gilder
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/98959802?language=en
• 关键词: Understanding; magnetic; remanence; acquisition; sediments

This is a renewal proposal for the project to better understand how sediments acquire a magnetic remanence. We have obtained unique spherical synthetic material whose size distribution and magnetic properties we have accurately characterized. We have systematically conducted several deposition experiments with this material showing that more than 80% of the remanence is acquired within ~100 minutes, the settling time of the largest grain size fraction, and is dependent on the applied field. We observe an appreciable inclination error, ascribed to the rolling of the particles in niches at the sediment-water interface, a mechanism that has been proposed but never directly observed. In our experiments the inclination error is dependent on the applied field and on the sediment concentration/sedimentation rate, which directly relates to the efficiency of locking-in of the particles. Due to the time it took to find the appropriate material and build the necessary experimental apparatus, we have only been acquiring publishable data since June 2010. Now that everything is in place and that the experiments are being performed uninterruptedly, we ask for only six months of additional funding which will allow us to finalize ongoing experiments on spherical particles, complete them with crucial additional experiments on ellipsoidal particles, and write up the results for publication.

这是该项目的续签建议，以更好地了解沉积物如何获得磁性。我们获得了独特的球形合成材料，其大小分布和磁性特性已经准确地表征了。我们已经系统地对这种材料进行了几项沉积实验，表明超过80％的re漫画是在〜100分钟内获得的，这是最大的晶粒尺寸分数的沉降时间，并且取决于所施加的磁场。我们观察到一个明显的倾斜误差，归因于在沉积物 - 水界面处颗粒的滚动，这是一种已提出但从未直接观察到的机制。在我们的实验中，倾斜度误差取决于所施加的场和沉积物浓度/沉积率，这与颗粒的锁定效率直接相关。由于找到合适的材料并建立必要的实验设备所需的时间，我们只有自2010年6月以来才能获取可发布的数据。现在，一切都已经到位，并且实验不断地进行了实验，我们只要求六个月的额外资金，这可以使我们能够完成对球形粒子的持续实验，并在eLLIP上进行额外的实验，并在ellip上进行撰写。