Full vector secular variation during the Brunhes Chron in Mexico determined from volcanic hard rocks

由火山硬岩确定的墨西哥 Brunhes Chron 期间的全矢量长期变化

• 批准号: 45687134
• 负责人: Privatdozent Dr. Norbert R. Nowaczyk
• 金额: --
• 依托单位: Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum (GFZ)
• 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 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/45687134?language=en
• 关键词: Full; vector; secular; variation; during

We intend to study systematically volcanic rocks from the Transmexican Volcanic Belt, extending the time range covered in the preceding project back through the entire Brunhes polarity chron (-780 ka). Further palaeomagnetic data shall contribute to increase our knowledge of the variability of the geomagnetic field, including geomagnetic excursions falling into that time window. To recognise such events and excursions, palaeodirections and palaeointensities have been and will be determined. The finding of excursions at low latitudes would be of great interest, to compare the field behaviour with that at high northern and southern latitudes. Some precise age data are already available from Mexican rocks, additional ones will be determined as part of the project. Absolute palaeointensities together with absolute age data will be also of use to refine and calibrate relative palaeointensity curves reported from marine sediments, which may be affected by delayed lock-in of remanence and/or by diagenetic as well as climatic perturbations.

我们打算系统地研究德米西亚火山带的火山岩，将前一个项目涵盖的时间范围延长到整个布伦斯极地纪元(-780ka)。进一步的古地磁数据将有助于增加我们对地磁场变异性的了解，包括落入该时间窗口的地磁漂移。为了识别这样的事件和远足，已经并将确定古方向和古强度。在低纬度发现漂移将是非常有意义的，以便将野外行为与南北高纬度的野外行为进行比较。一些准确的年龄数据已经从墨西哥岩石中获得，其他数据将作为该项目的一部分进行确定。绝对古强度和绝对年龄数据也将用于精炼和校准海洋沉积物报告的相对古强度曲线，这些曲线可能受到剩磁延迟锁定和/或成岩作用以及气候扰动的影响。