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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.

古地磁学的一个重要缺陷是准确地确定沉积物中的地磁场倾角，沉积物是地球表面最丰富的岩石类型。由于古纬度是直接从倾角计算的，磁倾角记录过程中的偏差会导致对纬度迁移的错误估计。在中亚，浅的古纬度造成了一个特殊的困境，那里隐含着不切实际的构造缩短量。这扭曲了我们对印度-亚洲碰撞如何发生变形的认识。其他地方的大陆沉积物没有或几乎没有倾斜变浅的证据。不幸的是，大多数技术来量化倾斜的大小变浅集成在岩石中的所有颗粒，而不仅仅是那些携带剩磁。一个例外是各向异性的无磁滞剩磁磁化方法，它可以适用于持有剩磁的颗粒的分数。然而，这种技术是如此耗时，以至于不存在对大量样本的研究。我们建议通过建立一个全自动系统来解决这个问题，一次测量>100个样品的磁各向异性，并将该方法应用于中亚的新近纪样品。