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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

基本信息

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

项目摘要

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.

沉积物是地球表面最丰富的岩石类型，古地磁的一个重要缺陷是准确测定沉积物中的地磁场倾角。由于古纬度是直接由倾角计算的，因此磁倾角记录过程中的像差会导致纬度输运的错误估计。古纬度较浅的地区在中亚造成了一个特殊的困境，在那里，构造缩短的幅度是不现实的。这扭曲了我们对形变是如何响应印度-亚洲碰撞而发生的认识。其他地方的大陆沉积物没有或很少显示出倾斜变浅的证据。不幸的是，大多数量化浅层倾斜度的技术都是综合了岩石中的所有颗粒，而不仅仅是那些携带剩磁的颗粒。一个例外是非滞后剩余物磁化方法的各向异性，它可以应用于持有剩余物的晶粒的部分。然而，这种技术非常耗时，以至于没有对大量样本进行研究。为了解决这一问题，我们建议建立一个全自动系统，一次测量bbbb100个样品的磁各向异性，并将该方法应用于中亚新近系样品。