GEOL 1001 : Goeology 1001 Test 3 Notes
Document Summary
Change in shape do to the is called stain. Studied by structural geology: deformation stain creates joints( fractures that have no offset) folds (layers that are bent by showing plastic flow) faults(fractures that are offset) foliation(planar metamorphic fabric) Tensional/extension (pulling apart, greater stress in one direction, thins material) shear (sliding past, crust doesn"t thicken of thin: tectonic collision produces horizontal compression. Most common type of deformation: pressure object feels the same stress on all sides. Structures: 3-d structural orientation strike (horizontal intersection with a tilted surface) dip (angle of surface down from the horizontal, perpendicular to strike, measured downslope) Linear structures bearing (compass direction) plunge (angle from the horizontal) Joints planar rock fractures without offset, from tensional tectonic stresses. Joints control weathering of rock: faults planar fractures offset by movement across the break. Abundant and occur at a variety of scales.
