EESA06H3 Lecture Notes - Lecture 6: Himalayas, San Andreas Fault, Tethys Ocean
Document Summary
Focus on the aplines himalayan mountain belt. There are also trenches that identify subduction zones (pacific rim of fire). This continuous rim is called volcanic arcs (made of islands serve for subduction zones, and allow for magma to come back to the surface for recycling). Left image is tethys ocean (dead ocean already closed) We need to know how plates interact with each other. Age of plate = thickness of plate = density of plate. Older ocean floor = thicker (heavier) subduct below another ocean floor that"s. Younger and lighter makes volcanoes (makes island in the middle of oceans . Plates sliding past each other transform plate. Doesn"t happen around pacific rim (because we are only subducting oceanic crusts). Oceanic crust vs. oceanic crust: which one is more dense left. Makes islands in the middle (island arcs) Magmatic arcs occur on the contient that"s being undercrust by oceanic crust. We convert oceanic crust into continental crust (form of recycling)
