ENVR 1200 Chapter Notes -Lithology, Geochronology, Decay Chain
8 Apr 2014
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A craton is crust that hasn"t been deformed in 1 ga. Platforms = shields covered by layers of phanerozoic strata. Three types of deformation : displacement location. Strain = a change in shape due to deformation. Occurs at higher pressure and temp in the deeper crust. The 3d orientation of a plane is described by strike and dip. Strike = horizontal intersection with a tilted surface. Dip = the angle of the surface down from the horizontal. Groundwater often flows through joints (cracks in a rock). They are abundant in the crust and occur at all scales. Oblique slip components of both dip and strike slip. Dip slip blocks move parallel to the dip of the fault. Strike slip blocks move parallel to the fault plane strike. Reverse faults dip is steeper than 35 . Thrust faults dip is less than 35 . Shear causes rocks to fold over on themselves:
