Popular in Physical Geology
Popular in Geology
This 2 page Class Notes was uploaded by samantha Flavell on Sunday February 21, 2016. The Class Notes belongs to GEO 100 at State University of New York at Oswego taught by Rachel Lee (P) in Fall 2015. Since its upload, it has received 27 views. For similar materials see Physical Geology in Geology at State University of New York at Oswego.
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Date Created: 02/21/16
Continuation of Notes: Plate Tectonics Convergent *Deep focus earthquake *Seismic tomographic evidence for subduction *Positions of oceanic trenches *Nature and age of volcanic rocks *Organic belts (Granite batholiths, high pressure rocks, fold/thrust belts) *Ophiolites *Microplate terranes *Continental plates hit and form mountains because they cannot subduct Microplate Terrane Accretion *During plate convergence material on the ocean floor can be ‘swept up’ and attached (accreted) to the leading edge of a continent. **Accretion: the process of sticking things together *How are microplate terranes recognized? Age of rocks Igneous history Structural (Deformation) history Fossil assemblages/paleoenvironment Paleomagnetism *The only place where there are deep focus earthquakes is at the subduction zones where foci align at a plane called the WadatiBerioff Zone. Plate Boundaries *Divergent Spreading zones Rifting zones (new plate boundary forms) *Transform Plates slide past each other *Convergent Subduction zones Collision zone (Plate boundary eliminated) Unusual Tectonic locations *Triple Junction 3 Plates meet *Unstable plate joint where one arm usually fails forming a single divergent plate boundary *Hot Spots Form in interior of plates of on oceanic ridge Produce volcanoes or chains of volcanic islands Caused by mantle plumesmaybe
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