{"id":117,"date":"2017-01-23T16:35:25","date_gmt":"2017-01-23T16:35:25","guid":{"rendered":"https:\/\/pressbooks.ccconline.org\/introduction-to-oceanography\/chapter\/4-3-mechanisms-for-plate-motion\/"},"modified":"2021-10-25T21:16:40","modified_gmt":"2021-10-25T21:16:40","slug":"4-3-mechanisms-for-plate-motion","status":"publish","type":"chapter","link":"https:\/\/pressbooks.ccconline.org\/introduction-to-oceanography\/chapter\/4-3-mechanisms-for-plate-motion\/","title":{"raw":"4.3 Mechanisms for Plate Motion","rendered":"4.3 Mechanisms for Plate Motion"},"content":{"raw":"
\r\n\r\nIn section 4.1<\/a> we learned that one of the reasons that Wegener's ideas of [pb_glossary id=\"648\"]continental drift[\/pb_glossary] were initially rejected by the scientific community was that he could not provide a plausible mechanism for [pb_glossary id=\"1038\"]plate [\/pb_glossary] motion. However, with all that we have learned about the processes occurring in the Earth's interior since then, there is still some debate about the actual forces that make the plates move. One side in the argument holds that the plates are only moved by the traction caused by [pb_glossary id=\"1276\"]mantle convection[\/pb_glossary]. The other side holds that traction plays only a minor role and that two other forces, [pb_glossary id=\"1082\"]ridge push[\/pb_glossary] and [pb_glossary id=\"1142\"]slab pull[\/pb_glossary], are more important. Some argue that the real answer lies somewhere in between.\r\n\r\nTo understand [pb_glossary id=\"1276\"]mantle convection[\/pb_glossary]<\/strong>, imagine a pot of water on a hot stove. The water at the bottom of the pot near the heat source becomes hot and expands, making it lighter (less dense) than the water above. The hot, low density water rises, and cooler, denser water sinks and flows in from the sides. This water then gets heated and rises, and the cycle continues. This creates a circular pattern of rising and sinking water called a [pb_glossary id=\"1278\"]convection cell[\/pb_glossary]<\/strong>. (To test this, try sprinkling a few flakes of spice in the center of a rapidly boiling pot of water. The flakes will move outwards to the edge of the pot as warmer water rises and pushes them aside).\r\n\r\nHeat is continuously flowing outward from Earth\u2019s interior, and the transfer of heat from the [pb_glossary id=\"660\"]core [\/pb_glossary] to the [pb_glossary id=\"930\"]mantle [\/pb_glossary] causes convection in the mantle (Figure 4.3.1). Even though the mantle material is essentially solid rock, it is sufficiently plastic (fluid) to slowly flow (at rates of centimeters per year) as long as a steady force is applied to it. This convection is a driving force for the movement of tectonic [pb_glossary id=\"1549\"]plates[\/pb_glossary], as the horizontal movements of mantle under the [pb_glossary id=\"670\"]crust [\/pb_glossary] drag the plates with them. At places where convection currents in the mantle are moving upward, new [pb_glossary id=\"902\"]lithosphere [\/pb_glossary] forms and the plates move apart (diverge). Where two plates are converging (and the convective flow is downward), one plate will be [pb_glossary id=\"1184\"]subducted [\/pb_glossary]<\/strong> (pushed down) into the mantle beneath the other.\r\n\r\n \r\n\r\n[caption id=\"attachment_115\" align=\"aligncenter\" width=\"500\"]\"Illustration<\/a> Figure 4.3.1<\/strong> Convection cells in the mantle (By Surachit [GFDL (http:\/\/www.gnu.org\/copyleft\/fdl.html) or CC BY-SA 3.0], via Wikimedia Commons).[\/caption]\r\n
<\/div>\r\nThe [pb_glossary id=\"1082\"]ridge push[\/pb_glossary]\/[pb_glossary id=\"1142\"]slab pull[\/pb_glossary]<\/strong> model also relies on mantle convection, but in this case it is not simply the traction from the convection cell that moves the plates. In this model, plates move through a combination of pull from the weight of the subducting edge of the plates, and through the outward pushing of an ocean ridge where magma is rising and forming new crust (Figure 4.3.2).\r\n\r\n \r\n\r\n[caption id=\"attachment_116\" align=\"aligncenter\" width=\"700\"]\"Models<\/a> Figure 4.3.2<\/strong> Models for plate motion mechanisms (Steven Earle, \"Physical Geology\").[\/caption]\r\n\r\n<\/div>\r\n
Some compelling arguments in favor of the ridge-push\/slab-pull model are as follows: (a) plates that are attached to subducting slabs (e.g., Pacific, Australian, and Nazca Plates) move the fastest, and plates that are not (e.g., North American, South American, Eurasian, and African Plates) move significantly slower; (b) in order for the traction model to apply, the mantle would have to be moving about five times faster than the plates are moving (because the coupling between the partially liquid [pb_glossary id=\"552\"]asthenosphere[\/pb_glossary] and the plates is not strong), and such high rates of convection are not supported by geophysical models; and (c) although large plates have potential for much higher convection traction, plate velocity is not related to plate area. Although ridge-push\/slab-pull is the favored mechanism for plate motion, it\u2019s important not to underestimate the role of mantle convection. Without convection, there would be no ridges to push from because upward convection brings hot buoyant rock to surface. Furthermore, many plates, including our own North American Plate, move along nicely \u2014 albeit slowly \u2014 without any slab-pull happening.<\/div>\r\n
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