GEO 303 Chapter Notes - Chapter 18: Unconformity, Oceanic Crust, Nonconformist
24 Dec 2017
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Study of the geometry and geologic history of rock units that have undergone. When stress is applied to a rock, it deforms by change of shape, change of size, or both. exceeds rock strength. If stress acts slowly, especially under conditions of elevated pressure (p) and temperature (t) deep in the earth, the rock may deform in a ductile (flowing) manner, even while remaining a solid material. A rock could experience brittle strain, or ductile strain, or no strain. deformation. Requires an understanding of the geologic history of the rock body prior to, and since. Don"t forget the laws and principles of stratigraphy! Interpretations often start with an undeformed layer cake. Vertically directed stress: stress up or down. The ever-present force of gravity acts in a vertical direction, perpendicular to the earth"s. In contrast, compressional or tensional stress is typically exerted in a horizontal. In this circumstance, the role of gravity is more subtle and indirect. direction. surface.
