To understand how continental sediments acquire their magnetic records through automized remanence anisotropy experiments

了解大陆沉积物如何通过自动剩磁各向异性实验获取磁记录

• 批准号: 49045840
• 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: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/49045840?language=en
• 关键词: understand; how; continental; sediments; acquire

An important flaw in paleomagnetism is accurately determining geomagnetic field inclination in sediments, which are the most abundant rock type on the Earth's surface. Because paleolatitude is calculated directly from inclination, aberrations in the recording process of magnetic inclination lead to erroneous estimates of latitudinal transport. Shallow paleolatitudes pose a particular dilemma in central Asia, where unrealistic amounts of tectonic shortening are implied. This distorts our knowledge of how deformation has occurred in response to the India-Asia collision. Continental sediments elsewhere can show no or little evidence for inclination shallowing. Unfortunately, most techniques to quantify the magnitude of inclination shallowing integrate over all the grains in the rock and not only those that carry the magnetic remanence. An exception is the anisotropy of anhysteretic remanent magnetization method, which can be applied to the fraction of the grains that hold the remanence. However, this technique is so timeconsuming that studies on large numbers of samples are non-existent. We propose to remedy this by building a fully automated system to measure the magnetic anisotropy of >100 samples at a time, and apply the method to Neogene samples from Central Asia.

古磁性中的一个重要缺陷是准确地确定沉积物中的地磁场倾斜度，这是地球表面上最丰富的岩石类型。由于古老的倾向直接计算出磁性倾斜过程中的畸变导致纬度转运的错误估计。浅色古介质在中亚构成了特定的困境，其中隐含了不切实际的构造缩短。这扭曲了我们对响应印度 - 亚洲碰撞的变形的了解。其他地方的大陆沉积物不能显示出倾斜度降低的证据或很少的证据。不幸的是，量化倾斜度大小的大多数技术都会在岩石中的所有晶粒上整合，而不仅仅是那些携带磁性的晶粒。一个例外是Anhysteretic Remanent磁化方法的各向异性，该方法可以应用于持有Remanence的晶粒的比例。但是，这种技术是如此的时间，以至于对大量样品的研究不存在。我们建议通过构建一个全自动系统来测量一次> 100个样品的磁各向异性，并将方法应用于中亚的新金元样本。

项目成果

A new software for the measurement of magnetic moments using SQUID and spinner magnetometers

• DOI: 10.1016/j.cageo.2010.05.002
• 发表时间: 2010-09
• 期刊: Comput. Geosci.
• 作者: Michael Wack

The SushiBar: An automated system for paleomagnetic investigations

SushiBar：古地磁研究自动化系统

• DOI: 10.1029/2011gc003985
• 发表时间: 2012
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: S.A. Gilder