GLY-2250 Chapter 9: Geo NotesChapter 9 Continental Tectonics and Mountain Chains
Document Summary
Continent breaks apart valleys form new seaway forms b/w spreading land masses can begin to fracture continent and then fail (midcontinent rift system) Collision can suture two continents together or small crustal fragment to larger continent mountain chain forms along suturing zone and along margin of continent at. San andreas shatters rocks, accelerated erosion, scar like valley. Africa and adjacent seas cenozoic era rift valleys, red sea through gulf of aden breaking of continental lithosphere. Triple junctions: three armed grabens at plate boundaries continental crust frequently elevates into a dome (hot spots) each boundary may consist of a spreading or subduction zone or transform fault. Sometimes all three arms can become plate boundaries (mar) Mors and block faulting: normal faulting that produces blocks of crust graben running along ridge"s (cid:373)idli(cid:374)e. Spreading zone hits continental crust: not a clean cut through breaks thing continental crust into bands of fault blocks africa today.
