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Constructive Plate Margins - Revision Using the following key words, draw a constructive plate margin on your white board and label correctly • • • • • • • • • Sea floor spreading Magnetic strips Divergent Basalt intrusion Upper Mantle partial melting Ocean ridge High heat flow Transform faults Abyssal plain Constructive Plate Margins - Revision Using the following key words, draw a rift valley and label the parts • • • • • • Normal faults Basalt Convection currents Basalt intrusion Upper Mantle partial melting High heat flow Plate Margins • Three main types of plate margin: – Constructive – Destructive – Conservative • Each type of plate margin has different rocks and types of hazard – why ? Destructive Plate Margins • May also be called convergent plate margins. Why? • There are three types of destructive plate margins depending on what type of plates are involved: – Oceanic v Oceanic – Oceanic v Continental – Continental v Continental • Each will produce different hazards and rocks Pre-Continent/Continent Collision Features Partial melting of oceanic plate basalt and continental plate granite = andesitic/granitic magma Where might we find andesitic rocks? – Subduction zone: describes the whole area where subduction is taking place – Ocean Trench: is the deep valley formed in the ocean floor as the subducted plate bends – Benioff zone: zone of earthquakes set off by the solid lithospheric plate forcing it’s way through the mantle Oceanic v Oceanic Collision – Island Arc: An arc of islands running parallel to the trench/subduction zone created by volcanic activity fed by magma from the melting subducted plate Label: • Trench • Island Arc System • Benioff Zone • Cold, Hot Regions Why would one oceanic plate subduct beneath another ? What type of rock would we find here ? Continent/Continent Collision About 40 million years ago India collided with Asia and a huge mountain chain formed. Both plates were made of continental crust Why did they collide ? What destructive zone features are missing ? Eurasian Plate Indo-Australian Plate When partial melting occurs beneath two continents colliding, what rock type would be produced ? Granite Subduction zone Trench Volcanoes Homework For Monday – see slip
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