2. Shear zones, Catalina and Tanque Verde

3. Outline Review structures you saw on Saturday Clarify some questions Come up with a geologic model for the Catalinas Takehome points - shear zones

7. Undeformed granite Mylonite

8. Low strain High strain

14. Still nature with dudes

15. Normal faults throughout - cut foliation and other ductile structures

16. Normal fault

17. Foliation- not sedimentary layering Measurable like bedding-good first indication of direction of ductile deformation

18. Mylonites Porphyroclasts Gneissic banding Rotated crystals

19. Fractured fold - top to the south

21. S C

22. Lineation- not as clearly defined as foliation; why? What kinda tectonites are these then? Dudes

23. Top to the south sense of shear

26. Ductile first Brittle later

27. Beware of dog approaching

28. X-cutting dike (or discordant igneous intrusion if you wish) - seals all the ductile deformation- an absolute age on this basaltic material would constrain the end of ductile deformation

30. Ductile deformation top to the south is given by foliation (direction), sense of shear indicators (folding, S-Cs) and lineation Brittle is overprinted- low angle normal faults cutting the old foliation

33. Sequence of events:

34. The strength versus depth issue

35. Reminder-simple shear deformation

37. Assignment due a week from Thursday