GLGY 301 Lecture Notes - Lecture 6: Insular Belt, Convergent Boundary, Accretionary Wedge
20 Jun 2020
School
Department
Course
Professor
Document Summary
Western cordillera has been a convergent margin. Divergent margin: splitting apart (ie. continental rifting) Transform margin: side to side, things slip past each other. Active accretionary prism: sediment that accretes where convergent boundary is. Sediment that is being scraped off as it going into subduction zone. As it runs into subduction zone, the zone scrapes the sediments into a big pile. Incoming exotic terrane: they form off shore, then they come into convergent plate boundary. Older accreted terrane: docked against craton for some amount of time. Suture zone: marks the boundary between what is already there and what was accreted. Could be between 2 terranes (eg. coast belt) or between a terrane and something that belonged to the continent (eg. intermontane and omineca because omineca is mostly rocks that were deposited on north america) Active volcanic arcs: geological shorthand for magnetism resulting from subduction, cause melting of rocks above it.
