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

尽管在过去的几十年里，在破译地球磁场逆转过程中磁场的几何变化方面取得了重大进展，但关于地球历史上更远的过去的磁场转变的记录仍然非常稀少。特别是关于地球逆转之前、期间和之后的古磁场强度的信息基本上是不可用的。同样的道理也适用于对反转期间方向变化的系统研究。因此，为新生代和第三纪岩石开发的场反转模型是否适用于地球历史上更老的时代，目前还没有得到证明。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。这些岩石横跨二叠系-三叠系界线，年代测定准确，初步结果表明该物质适合进行古地磁和岩石磁学研究。预计将获得有关过去地球磁场的几何形状和强度的宝贵信息。

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.