Lecture Eight - Strike slip tectonics Flashcards
What is oblique convergence or divergence?
Most plate boundaries do NOT have plate motions which is perpendicular to the plate boundary.
There is usually a component of oblique convergence or divergence.
In extreme cases - if the motions are parallel to the plate boundary - we have strike slip tectonics.
What is transpression and transtension?
Strike slip with a component of shortening = transpression.
Strike slop (lel) with a component of extension = transtension.
What is a bend or jog?
Two kinds of bends:
Restraining bend or transpressional fault jog or contractional jog = produces local shortening and a ‘pop-up’ commonly in the form of a positive flower structure.
Transtensional bend or transtensional fault jog or dilational jog = produces local extension commonly in the form of a negitive flower structre.
Show what a negitive and positive flower strcutre looks like.
In what ways can the earth accomodate for the oblique movement of plates, if compression and lateral movement is occuring?
Transpression migth be accompanied by strike slip faults and zones of shortening (i.e. pop-ups) in ‘series.
Or by strike slip faults and zones of shortening (thrusts and folds) in ‘paralell.’
