ME 4133 : Test 1 2012 Pg 5
Document Summary
Transformation of one rock (parent rock) to another rock type. Solid-state changes -> mineralogy and texture (shale to gneiss) Mineral grains change size and shape (not necessarily mineralogical change) Differential stress (one amount of stress coming from two sides, another amount of stress coming from other two sides) (above) can all work together or autonomously. Ion migration resulting in segregation of minerals (light and dark) Sequence of common shale parent rock illustrates the changes from low grade to high grade metamorphism. Relative age dating: how old something is relative to something else. Numerical: talking about age and numbers. (you are 20, he is 25) Early history and the magnitude of geologic time is recorded in the rocks. Physical processes we observe today also operated in the past. Oldest stuff on the bottom, youngest on the top. Sediments will be deposited in a horizontal layer. The dike (picture 2) is younger than the rock in which it intrudes (picture.
