EESA06H3 Lecture Notes - Lecture 9: Shear Zone, Himalayas, Gunflint Chert
Document Summary
This was a aparadigm introduced during the early eighties: obduction: no sucduction involved; continents collide together rbut no volcanic activity. An important process for how contiennts grow through time. Most contiennts are grown from small species of crust obducting. Therefore a mosaic; and the time at which these pieces are added coincides with supercontinent assembly. Craton and cratonization (process by which continents grow: cratonization: cratonization involves repated obduction events, craton= canadian shield; it is the core of the canadian shield and younger rocks created around. Cratons are rocks older than 600 million years; precambrian rocks. Most rocks worldwide have a precambrian craton; north-america"s craton being the canadian. A lot of canada"s mineral wealth comes from the shield. Province (old crust now embedded in continents: province are the crustal pieces; province: broad expanse og geology that is the same age and same type; north america can be broken down into many provinces. How do these big pieces of these provinces juxtaposed.
