When an oceanic plate sinks underneath a continental plate it is called subduction zone. Oceanic continental convergence fig21oceancont i18. Finally, as the descending plate melts, it leads to volcanic activity on the surface of the continental plate. Alternating magnetic polarity recorded at midocean ridges divergence, 2. This is occurring where the oceanic nazca plate is subducting under the south american plate, creating the andes mountains and the peruchile trench. Processes that occur along plate boundaries divergent, convergent, and transform motion, and 3. This oceanic spreading center might have basaltic volcanic islands along it, and two mirrored plates on each sides, pushing towards neighboring continental or oceanic plates.
This project was created with explain everything interactive whiteboard for ipad. Oceancontinent convergence when oceanic crust converges with continental crust, the denser oceanic plate plunges beneath the continental plate. Convergent boundaries wks loudoun county public schools. Oceanic continental convergence is active margin ocean. Learn vocabulary, terms, and more with flashcards, games, and other study tools. When oceanic lithosphere and continental lithosphere collide, the dense oceanic lithosphere subducts beneath the less dense continental lithosphere. Volcanic, volcanoes are made at convergent boundaries.
A convergent boundary is a destructive plate boundary. Oceanicoceanic convergence the older, denser plate subducts under another oceanic plate, forming a trench. Oblique view of a highly generalized animation of a subduction zone where an oceanic plate is subducting beneath a continental plate. When continental and oceanic plates collide, the thinner and more dense oceanic. Oceanic to continental created by grace laman with tinkercad. Oceanic continental convergence my learning journey. Where the two plates meet, the denser oceanic lithosphere of the nazca plate is forced down and under the more buoyant continental lithosphere of the south american plate, descending at an angle into the mantle in a. Oceanic continental convergence as dense oceanic crust collides with the less dense continental crust, the oceanic plate generally slides beneath the continental plate, and, along the line of contact an ocean trench may form. Click create assignment to assign this modality to your lms. When an oceanic and a continental plate converge the oceanic plate sinks underneath the continental plate.
When continental plates collide with oceanic plates, the oceanic plates always go underneath. These collisions happen on scales of millions to tens of millions of years and can lead to volcanism, earthquakes. A convergent, or distructive, boundary showing subduction of an oceanic plate under a continental plate. We see the denser oceanic plate diving beneath the.
A good example of this is the san andreas fault off the west coast of america. The identification of continentocean boundaries is important in the definition of plate boundaries at the time of breakup when trying to reconstruct the geometry and position of ancient continents e. An example of oceaniccontinental convergence is where the south american plate meets the pacifics nazca plate. Oceaniccontinental convergence fig21oceancont spanish. The presence of hot, waterrich liquids causes the overlying rock to begin melting. When the oceanic plate pushes the continental plate up it can become a mountain. An example of oceanic continental collision is seen at the cascadia subduction zone, where the pacific plate is being subducted beneath the north american plate. This ninth edition of essentials of geology offers completely updated material and an extensively revised design. Which of the following is not a convergent boundary a. Meant to add that if you have access to a library or can find a copy of it somewhere, cloos, m. As the oceanic plate is denser, it goes beneath the continental plate, a process called subduction, the entire region where this happens is called subduction zone.
At convergent boundaries, continental crust is created and oceanic. The subduction causes low density ocean floor sediment to be scraped off the surface of the south american plate and thrust onto the caribbean islands as accretionary wedges, in a process called obduction. Oceanic continental convergence flashcards quizlet. Change temperature, composition, and thickness of plates. The mesozoic and cenozoic rocks of western north america are primarily a record of plate convergence in all its forms. Base sur le fichier oceaniccontinental convergence fig21oceancont. In this concept we look at subduction of an oceanic plate beneath a continental plate in the paci. Subduction an oceanic plate goes under a continental plate and causes volcanism on the continental plate. Oceanic oceanic convergence one plate descends or subducts beneath the other from geol g107 at indiana university, purdue university indianapolis. Label drawing as to what each item represents in terms of earth layers or processes of plate tectonics.
A convergent plate boundary is a location where two tectonic plates are moving toward each other, often causing one plate to slide below the other in a process known as subduction. In this animation, we are showing an oceancontinent convergent. Oceancontinent convergent plate boundaries ck12 foundation. Subduction of oceanic plateaus, continental margins, island arcs, spreading ridges, and seamounts, geological society of america bulletin, v. Animations coded as es0803, es0804, and es0804 found in. When the subduction zone is along an oceaniccontinental boundary, it creates a deepsea trench. Feb 14, 2017 convergent plate boundary two oceanic plates. Oceanocean convergent plate boundaries learn that subduction of the older, denser oceanic crust leads to the formation of a volcanic island arc and accompanying earthquakes.
The on the cutting edge website and workshop program are supported by the. Exploring earth more info plate tectonic animations of 1. Example of a tectonic event that has occurred at this boundary. Visualizations include simple animations, gisbased animated maps. At the subduction zone a very deep trench is formed in the ocean floor. This convergence creates a subduction zone, which is where one plate is submerged below the other. Looking to create a detailed and innovative oceanic continental convergence system diagram. Predict how changes in composition and temperature change crust density and buoyancy. Since areas of continental do not shrink and some oceans open, some area must be lost because the earth isnt changing size overall. When the subduction zone is along an oceanic continental boundary, it creates a deepsea trench. In this animation, we are showing an oceancontinent convergent boundary at the leading edge of the plate. This is similar to oceanic continental convergence in that one of the plates is subducted under the other during the collision. The subduction zone can be defined by a plane where many earthquakes occur, called the wadatibenioff zone.
Seafloor spreading animation earthguide online classroom. Deep subduction of the indian continental crust beneath asia. Seafloor spreading at midocean ridges produces and adds new area to the oceanic lithosphere. The plate collisions that occur in these areas can produce earthquakes, volcanic activity, and crustal deformation. Mountain ranges can form when two continental plates collide as, it is more difficult for one. We see the denser thinner oceanic plate diving beneath the continental plate. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. Covers convergent plate boundaries where an oceanic plate meets a continental. Which type of convergent plate movement is depicted in the.
When oceanic and continental plates collide, the oceanic plate is the one that is subducted beneath the continental plate, because the continental crust is lighter and less dense. Explain how their location would lead to the hypothesis that they could have been formed by continental continental convergence. An oceanicoceanic collision is when two tectonic oceanic plates collide. An example of oceaniccontinental collision is seen at the cascadia subduction zone, where the pacific plate is being subducted beneath the. Mar 19, 2020 there are three types of convergent plate boundaries. An oceanic oceanic collision is when two tectonic oceanic plates collide. Why not try this edraw preset template according to your love for science. The san andreas fault is a very late complication superimposed on this rich history of subduction. In this animation, we are showing an oceancontinent convergent boundary.
When the two plates collide, the more dense of the two is forced below the less dense. Oceaniccontinental convergence fig21oceancont french. The collision of tectonic plates can result in earthquakes, volcanoes, the formation of mountains, and other geological events. Some grow, some shrink and even disappear if mostly oceanic. Oceanic continental convergence fig21oceancont italian. This occurs because the continental plate is less dense. This process, called subduction, occurs at the oceanic trenches. The continentocean boundary cob or continentocean transition is the boundary between continental crust and oceanic crust on a passive margin.
Table 1 represents a simplified active continental margin subduction system comprising oceanic prolithosphere and continental retrolithosphere, overlying upper mantle, base 660 km, and. Describe the differences between oceanic and continental crust, including their respective properties of density, composition, temperature and thickness. Each one is unique because of the density of the plates involved. This creates magma and at the top the crust it creates a volcano. The downgoing oceanic plate eventually warms up to the temperature of the surrounding mantle. Jan 24, 2012 for the best answers, search on this site 1. Oceanic oceanic oceanic continental continental continental convergent boundaries create volc. Based on the file oceaniccontinental convergence fig21oceancont.
The area were the plate sinks into the mantle is called a subduction zone. As the oceanic and continental crust converge, the more dense oceanic crust sinks below the less dense continental crust. Nov 03, 2008 when oceanic and continental plates collide, the oceanic plate is the one that is subducted beneath the continental plate, because the continental crust is lighter and less dense. In 1977, after decades of tediously collecting and mapping ocean sonar. Examples in the world another example of the oceaniccontinental convergent boudaries is the washingtonoregon coastline of the us. When two oceanic plates meet the older, colder, and denser plate bends and sinks into the mantle. Geological investigations in the himalayas have revealed evidence that when india and asia collided some 90 million years ago, the continental. We use the 2d finite element software sopalenested to solve thermomechanical creeping flows at the mantle scale fullsack, 1995, beaumont et al. A convergent boundary is an area on earth where two or more lithospheric plates collide. New crust is then formed as the magma rises to create volcanoes. One plate eventually slides beneath the other causing a process known as subduction. Convergent plate boundaries are often the sites of earthquakes, volcanoes, and other significant geological activity. Oceanic oceanic convergence one plate descends or subducts.
Volcanoes can also be created by oceanic continental convergence. The subducting plate causes melting in the mantle above and consequently volcanoes. Subduction zones along an oceanic continental boundary create a deepsea trench. Discover how to create new mountains, volcanoes, or oceans. The andes the nazca plate is moving eastwards, towards the south american plate, at about 79mm per year. It is a region where two or more tectonic plates move towards each other and collide.
Schema du volcanisme au niveau dune convergence oceancontinent. As it goes under it creates a trench, and that is how the mariana trench was made. Draw a time series for different types of plate boundaries and their motions, indicating the related. As this plate is submerged an area is formed, called a benioff zone. Observe an animation of volcanism at a subduction zone. Mountain ranges can form when two continental plates collide as, it is more difficult for. Gtectonics upsc ias convergent boundaryformation of fold mountains,himalayas, rockies duration. Oceaniccontinental convergence as dense oceanic crust collides with the less dense continental crust, the oceanic plate generally slides beneath the continental plate, and, along the line of contact an ocean trench may form. What differentiates oceanicoceanic convergent plate.
Convergent plate boundaries are locations where lithospheric plates are moving towards one another. Learn that subduction of the older, denser oceanic crust leads to the formation of a volcanic island arc and accompanying earthquakes. The type of convergent plate movement depicted in the image is c. Jan 11, 2017 this project was created with explain everything interactive whiteboard for ipad. The process in action types of tectonic events that occur at this boundary convergent boundary from the drawing, we can see that the oceanic plate has slidden under the continental plate. Explore how plates move on the surface of the earth. We see the denser oceanic plate diving beneath the continental plate. An example of oceanic continental convergence is where the south american plate meets the pacifics nazca plate. The resulting magma is less dense than the surrounding rock, so it rises up toward the surface. Locate the himalayas on a world map use your notes. A convergent boundary might also feature two oceanic plates.
Learn more unknown facts about the ground right under your feet. Abad santos group 3 convergence of oceanic plates duration. As it is going down it causes friction and the rocks melt. The place where an oceanic plate goes down under into the mantle is called the subduction zone. Oceanic continental convergence fig21oceancont french. Some plates are entirely oceanic crust, or crust under the ocean, while others are a combination of oceanic and continental crust, which is crust of the continents. Convergent oceaniccontinental presentation software. The tectonic activity at this convergent boundary has led to the formation of the volcanic cascade mountain range. Explain how their location would lead to the hypothesis that they could have been formed by continentalcontinental convergence. This is because the oceanic lithosphere of the south american plate is cooler and denser than that of the caribbean plate. Feb 11, 2015 subduction an oceanic plate goes under a continental plate and causes volcanism on the continental plate. Im trying to think about any oddity that would fit your description, but cant really come up with a good example. Subduction zone decouplingretreat modeling explains south.
Volcanoes can also be created by oceaniccontinental convergence. As an oceanic plate descends to hotter depths beneath the overriding plate, it is heated and releases water. Learn about the three different types of convergent boundaries. Compare and contrast oceanicoceanic and oceaniccontinental. Tectonic plate motion, convergent boundaries pass my exams. An accretionary wedge forms on the continental crust as deepsea sediments and oceanic crust are scraped from the oceanic plate. This indicates how strong in your memory this concept is. May 29, 2010 geological investigations in the himalayas have revealed evidence that when india and asia collided some 90 million years ago, the continental crust of the indian tectonic plate was forced down. Deep subduction of the indian continental crust beneath. Oceaniccontinental convergence my learning journey. Examples in the world another example of the oceanic continental convergent boudaries is the washingtonoregon coastline of the us. An example of oceanic slab subduction would be the andes mountains of south america, which run along the western side of that continent.
Subduction zones along an oceanic continental boundary create large or small trenches on the sea bed. High tempuratures cause rocks to melt around the pacific ocean because of subduction. When the boundary is between an oceanic plate and a. The continental volcanic is not a convergent boundary. Plate tectonics earthquakes discovering geology british. Oceanic and oceanic plate convergence result in the formation of volcano chains.