EESA01H3 Lecture Notes - Lecture 9: Submarine Eruption, Igneous Rock, Oceanic Crust
Document Summary
All continents have crystalline rock which we called shield. Some rocks in canada come from china, scotland, scandinavia. Ophiolites: ancient oceanic crust. an igneous rock consisting largely of serpentine, believed to have been formed from the submarine eruption of oceanic crustal and upper mantle material) lots of canada is made of ancient oceanic crusts meteors: sand grains. Shatter cones: rocks that record tremendous impact pressures. Fiord: modification of original valleys by ice sheets. Pleistocene: time of ice ages humans started appearing. Rodina: grenville orogeny adds huge block 1. 3 billion years ago; appalachian mountains were formed 600 - 300 million years ago, Vancouver, bc, yukon all that is made up of terrains was added 250 million years ago, provinces are surrounded by orogens. Provinces were smaller continental pieces they collided with another one and oceanic crust is the stuff that got buckled up. Acosta gneiss is the oldest continental crust in the slave craton and it is 4 billion years old.
