PSYC90H3 Lecture Notes - Lecture 2: Arthur Holmes, Great Unconformity, Sulfide Minerals
Document Summary
Jack tuzo wilson in 1965 explained that places where crust isn"t spreading apart or coming together and getting recycled but rather moving past each other. The theory of plate tectonics hold that the earth"s lithosphere is divided into plates that move relative to one another, and relative to the underlying asthenosphere. As plates move, their interiors remain relatively intact, while their boundaries undergo deformation. Striping on ocean floor occurs because magma rises as ridge opens wider. Convergence begins, an oceanic plate subducts, creating a volcanic chain at an active margin. 4. terraine accretion from the sedimentary wedge welds material to the continent. Natural sources of heat in earth, cooling down from heat of formation. Material in mantle heats and wants to rise (convection currents). Uniformatarianism is the concept that all things that happen today have happened in the past too. This contrasts with catastrophism which holds that small things happen all the time to make changes, not just big catastrophes.
