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

点击翻译按钮获取中文摘要

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.