Chapter 6 struc

Chapter 6 struc - Geology 3443 Spring 2006 Chapter 6...

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Geology 3443 Spring 2006 Chapter 6 – Brittle Deformation 6.1 – 6.3 Definitions and Distinctions 1. Define each of the following: brittle deformation; a fracture; joint; a shear fracture and shear zone; a fault and a fault zone; a fracture front and fracture tip; a vein and a dike? 6.4 Tensile Cracking 2. What are Griffith cracks? How do they explain the difference in rock strength based on breaking chemical bonds and actual measured strength? Why do longer cracks grow faster than short cracks of the same orientation? What is a process zone? 3. As a rock is stressed, describe how Griffith cracks cause it to fail in tension. 4. What are the three modes of fracturing? 6.5 Brittle Faulting 5. What are the following: shear reactivation; fault surface veins; frictional sliding; cataclasis. 6.6 Shear Fractures 6. Using the stress/strain graph of Fig 6.14a, describe what is happening in the rock during each of the 4 segments of the curve as differential stress increases. 6.7.1 Predicting Tensile Cracks (joints)
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Chapter 6 struc - Geology 3443 Spring 2006 Chapter 6...

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