GEOL107 Chapter Notes - Chapter 15: Convergent Boundary, Shear Stress, Compressive Stress

• School: University of Delaware
• Department: Geology
• Course: GEOL107
• Professor: Madsen John

Document Summary

Force per unit area (at a particular point) The change in shape or size (volume), or both, in response to stress. Pushed together or squeezed from opposite directions. Results in rocks being shortened or flattened. Typically found along convergent plate boundaries where rocks have been pushed or shoved together. Caused by forces pulling away from one another in opposite directions. Results in stretching or extension of material. At divergent plate boundaries, lithosphere is undergoing extension as plates move away from one another. When stresses act parallel to a plane. Results in a shear strain parallel to direction of stresses. A deformed material recovers its original shape after the stress is reduced or removed. Rock will deform in permanent way when it reaches this level of stress. Bends under stress and does not return to its original shape after the stress is removed. Planar texture = foliation (due to alignment of minerals)