Read pages 545 - 550 of Hamblin for details on the tectonic movements along Transform Boundaries. Other Continental Transform Fault boundaries: Dead Sea,

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Presentation transcript:

Read pages of Hamblin for details on the tectonic movements along Transform Boundaries. Other Continental Transform Fault boundaries: Dead Sea, New Zealand: the Southern Alps.

Far from Plate boundaries, the movement of plates and earth’s internal heat together produce a new set of landforms. These are produced at the Hot Spots above the mantle plumes. Latest addition to the theory: in 1963 from observations in Hawaii. Volcanoes are progressively older along the direction of plate movement. mantle plume

Hot spots do not drift with the plates. They are rooted deep in the mantle. The lava erupted here are different from the ones produced at divergent plate boundaries: derived from deep in the mantle Plumes rise from km below Plumes carry materials of significantly higher temperatures (200ºc) than the mantle; ther rise from the base of the mantle; they are driven by internal heat; they lose heat with time (about 100 million years): temporary features. (Read pages of Hamblin, but you may reduce the contents)

Iceland lies at the intersection of Mid-Atlantic Ridge but also sits on a mantle plume which makes the volcanic material different from the usual basaltic rocks of the mid-oceanic ridges. 60 million years ago Today 30 million years ago

(Read pages of Hamblin) Plates and Plate Motion Earth’s major features, rocks, structures can be understood from the interactions of the plates in the tectonic system 1. Divergent margins: being pulled apart: marked by oceanic ridges 2. North and South American plates are moving westward: interacting with Pacific, Juan de Fuca, Cocos, and Nazca plates 3. Pacific plate is moving NW: deep sea trenches in western Pacific basin 4. Australian plate, includes Australia, India and NE Indian Ocean: moving Northward: produced Himalayan Ranges, Volcanic Arcs of Indonesia 5. African Plate, including Africa, SE Atlantic and W. Indian ocean: moving Northward: colliding with Eurasian plate 6. Eurasian plate moving eastward 7. Antarctic plate: includes Antarctica and floor of Antarctic Ocean: surrounded by oceanic ridges