deformation Flashcards
What is a compressive stress
pushes rocks together;
squeezing; shortening
What plate boundary is involved with compressive stress
Convergent boundaries
What is a tensional stress
pulls rocks apart; stretching
What plate boundary is involved with tensional stress
Divergent Boundaries
What is a shearing stress
Pushes either side of a formation in opposite directions
What plate boundary is involved with shearing stress
Transformation Boundaries
Define Brittle
Minor internal strain; Catastrophic break
(Like a potato chip = breaks easily)
Define Ductile
Smooth; plastic deformation
What is the pressure, temperature, strain rate, and water content for something brittle
Low confining pressure
Low temperature
High strain rate
Low water content
What is the pressure, temperature, strain rate, and water content for something ductile
High confining pressure
High temperature
Low strain rate
High water content
What’s the purpose of a strike and dip
To record the orientation of a rock
Define Strike
the direction of the intersection of a rock layer with a horizontal surface
Define dip
angle at which the bed inclines from the horizontal
Define Anticline
a convex-upward fold whose core contains the stratigraphically older rocks
Define Syncline
a concave-upward fold whose core
contains the stratigraphically younger rocks.
