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Geo101.10.MantleCrust2[1]

Geo101.10.MantleCrust2[1] - 1 Earth’s Mantle to Crust…...

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Unformatted text preview: 1 Earth’s Mantle to Crust… and the concept of Plate Tectonics… Egypt, Sinai, and the Arabian Peninsula 3 types of plate boundaries …based on relative motion between the two plates • divergent • convergent • transform 1. Divergent boundaries a) Oceanic - Oceanic: the formation of new oceanic crust Divergent, spreading boundaries, mid-ocean ridges A Divergent Boundary …geophysical properties of a ridge 2 Formation of new oceanic crust at a mid-ocean ridge… Divergent, spreading boundaries, mid-ocean ridges Mid-Atlantic Ridge … age of the Atlantic Ocean Floor Age of the ocean ¡oor… Continental Divergent Boundaries: Continental rifting Egypt, Sinai, and the Arabian Peninsula 2. Divergent boundary b) Continental - continental 3 Continental rifting East African Rift System Western North America… The Great Basin Convergent margins Continental - Continental Oceanic - Oceanic Oceanic- Continental Convergent margins also known as a) Convergent margins (Oceanic - Oceanic) 4 b) Convergent margins (Oceanic - Continental) c) Convergent margins Continental - Continental The geometry of a subduction zone The Wadati- Benioff zone . Associated with a subducting plate …a belt of earthquakes What do the rocks look like? Oceanic crust accreted onto Continental crust… an Ophiolite sequence …subduction along an island arc 5...
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Geo101.10.MantleCrust2[1] - 1 Earth’s Mantle to Crust…...

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