Direction and intensity of Earth's magnetic field at the Permo-Triassic boundary [Elektronische Ressource] : a geomagnetic reversal recorded by the Siberian Trap Basalts, Russia / vorgelegt von Christoph Heunemann

Direction and intensity of Earth’s magneticfield at the Permo-Triassic boundary: Ageomagnetic reversal recorded by theSiberian Trap Basalts, RussiaInaugural-Dissertationzur Erlangung des Doktorgradesder Fakult¨ at fur¨ Geowissenschaften derLudwig-Maximilians-Universit¨ at Munchen¨vorgelegt vonChristoph Heunemann4. August 20031. Berichterstatter: Prof. Dr. H. C. Soffel2. Bericht Prof. Dr. V. BachtadseTag der mundlic¨ hen Prufung:¨ 12.11.2003ContentsList of Figures 3List of Tables 5Glossary 6Preamble 8Zusammenfassung 9Abstract 131 Introduction 171.1 TheEarth’smagneticfield........................... 171.2 Polaritytransitions............................... 191.2.1 Palaeomagnetic records of reversals . . . . . . . . . . . . . . . . . . 191.2.2 Modelsofgeomagneticreversals.................... 201.3 TheMesozoicdipolelow. 221.4 Scientificaims.................................. 242 The Siberian Trap Basalts 252.1 GeologicalSeting................................ 252.2 Age and duration of the Siberian Trap volcanism . . . . . . . . . . . . . . 272.3 OriginoftheSiberianTrapBasalts...................... 283 Palaeomagnetic Results 303.1 Sampling..................................... 303.2 NRMdemagnetisation............................. 323.3 PalaeomagneticRecord............................. 413.4 Foldandreversaltest.............................. 473.5 PalaeosecularVariation 503.6 Magnetostratigraphiccorelation .......................