1. Magnetism GEO-3010 University of Utah Fan-Chi Lin

2. Reading – Chapter 10 of the textbook Lecture note 1-7 available – http://noise.earth.utah.edu/GEO3010/ http://noise.earth.utah.edu/GEO3010/ Quiz on April 8 (Gravity; Chapter 8-9). Announcement

3. Fundamental Component of a magnetic field?

4. Magnetic Dipole

5. Current induced magnetic field

6. Biot-Savart Law SI unit?

7. Biot-Savart Law = 4π × 10 −7 N·A −2 Magnetic constant Vacuum permeability SI unit of a magnetic field is Tesla or N/(m  A)

8. How to create magnetic dipole?

12. Geodynamo

13. How does a compass work?

15. Declination and Inclination

16. Inclination

18. Secular Pole Variation

19. Rock Magnetism What’s rock Magnetism?

20. Rock Magnetism

23. Paramagnetic Material

24. Magnetism GEO-3010 University of Utah Fan-Chi Lin

25. Reading – Chapter 10-11 of the textbook Lecture note 1-7 available – http://noise.earth.utah.edu/GEO3010/ http://noise.earth.utah.edu/GEO3010/ Quiz on April 8 (Gravity; Chapter 8-9). HW#5 due April 8 SEG special lecture: “The Physics of Rocks: What dielectric constant can tell us”, INSCC 110, April 3 rd 1pm. Announcement

26. = 4π × 10 −7 N·A −2

28. Earth magnetic dipole: μ = 7.94x10 22 Am 2

29. What can we learn from magnetism?

30. Rock Magnetism

31. Palaeopoles

32. Apparent Polar Wander

33. True polar wander? Can the pole move?

34. True polar wander? Pangea ~195 Ma Rodinia ~750 Ma Zhong et al., 2007

35. Dating Before 160 Ma?

36. Dating Before 160 Ma?

38. Subsurface imaging?

39. Susceptibility

40. Induced magnetic anomaly