Features of Plate Margins
- Created by: RobynAllday
- Created on: 04-03-14 16:48
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- Features Of Plate Margins
- Constructive features
- Oceanic ridges
- Mid-Atlantic Ridge
- volcanic activity also occurs along the ridge, forming submarine volcanoes, which sometimes rise above sea leve eg Surtsey, Iceland
- the parts of the diverging plates may move at different rates producing friction and ultimately earthquakes
- Rift valleys
- brittle crust fractures as sections of it move apart. areas of the crust drop down between parallel faults to form Rift Valleys
- African Rift Valley extends 4000km from Mozambique to the Red Sea
- often marked by a series of step faults
- Oceanic ridges
- Destructive features
- oceanic-continental convergence
- the denser oceanic plate if forced under the lighter continental plate (subduction)
- Forms ocean trenches
- Peru-Chile Trench
- the uplifting of the continental plate results in fold mountains such as the Andes
- Composite explosive volcanoes - Island Arc can appear
- Continental-continental
- fold mountains
- no volcanic activity
- shallow focus earthquakes
- Himalayan Range - Mt Everest
- oceanic-oceanic
- pcean trenchs and island arcs
- Eg pacific plate is being subducted beneath the smaller Philippine plate- forming the Marianas trench and a line of volcanic islands
- oceanic-continental convergence
- conservative features
- shallow focus earthquales
- San Francisco 1906 and 1989
- San Andreas fault California, where the pacific and north americanplates are moving parallel to each other, in the same direction but at different speeds
- Constructive features
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