Direction and intensity of the geomagnetic field before, during and after a reversal - paleo- and rockmagnetic studies on mesozoic and paleozoic volcanic rocks

反转之前、期间和之后的地磁场方向和强度 - 中生代和古生代火山岩的古地磁和岩磁研究

• 批准号: 5249080
• 负责人: Professor Dr. Heinrich Soffel
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2000
• 资助国家: 德国
• 起止时间: 1999-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5249080?language=en
• 关键词: Direction; intensity; geomagnetic; field; before

Although major advances have been made during the last decades in deciphering the change in geometry of the Earth's magnetic field during a reversal, the record of field transitions in the further past of Earth's history is still very sparse. Especially information on the paleointensity of the Earth's magnetic field before, during and after a reversal is basically not available. The same holds true for systematic studies of the directional change during a reversal. Thus, it hasn't been demonstrated yet, whether models for field reversals developed for Cenozoic and Tertiary rocks are valid for older epochs in Earth's history. In the project proposed here, a systematic paleomagnetic and rockmagnetic study of Siberian trap basalts is planned. These rocks straddle the Permo-Triassic boundary, are well dated and first results demonstrate the suitability of the material for paleomagnetic and rockmagnetic studies. It is anticipated that valuable information on the geometry and intensity of the Earth's magnetic field in the past will be gained.

虽然在过去的几十年里，在破译地球磁场在逆转期间的几何变化方面取得了重大进展，但在地球历史的更远的过去，磁场转变的记录仍然非常稀少。特别是关于地球磁场在反转之前、期间和之后的古强度的信息基本上是不可用的。这同样适用于对反转过程中方向变化的系统研究。因此，它还没有被证明，是否为新生代和第三纪岩石开发的场反转模型是有效的，在地球历史上的旧时代。在这里提出的项目中，计划对西伯利亚圈闭玄武岩进行系统的古地磁和岩石磁学研究。这些岩石跨越二叠纪-三叠纪边界，年代久远，初步结果表明，该材料适用于古地磁和岩石磁学研究。预计将获得关于地球磁场过去的几何形状和强度的宝贵信息。