where do mantle plumes usually occur
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- Let's review. Mantle plumes are hypothesized columns of hot mantle rocks that rise through the mantle from the mantle-core boundary to the base of the lithosphere. The lower lithosphere rocks are heated by the plumes and melt to form hot spots.
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The question of mantle plumes The question of mantle plumes. Over the years, many different locations have been proposed as hot spots. Some of the most well-known proposed sites are labeled with red dots in this diagram, which also depicts the borders of Earth’s tectonic plates. Credit: K. Cantner, AGI.
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- Usually volcanoes are found near subduction zones, where oceanic crust sinks beneath continental crust. In fact, they're quite often about 200 km inland (on the continental plate) from where the subducting plate sinks below the overriding plate.As the subducting plate sinks, it melts.olcanos are most commonly found at subduction zone boundaries. This is where the thinner oceanic plates get pulled under the thicker continental plates. As the plates go deeper, they melt and form pockets of magma which can cause mountains to be built and as the hot magma rises, it erupts out of volcanos.
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Seamount Most seamounts are volcanic in origin, and thus tend to be found on oceanic crust near mid-ocean ridges, mantle plumes, and island arcs. Overall, seamount and guyot coverage is greatest as a proportion of seafloor area in the North Pacific Ocean, equal to 4.39% of that ocean region.
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mantle Geologists think mantle plumes may be influenced by many different factors. Some may pulse, while others may be heated continually. Some may have a single diapir, while others may have multiple “stems.” Some mantle plumes may arise in the middle of a tectonic plate, while others may be “captured” by seafloor spreading zones.
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- Convection Currents occur when the heat from the earths core rises and heats up the mantle. the particles then become less dense and rise but when reaching the surface or top … they cool back down, become more dense and heavy therefore dropping.
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Mantle convection Earth cross-section showing location of upper (3) and lower (5) mantle. An oceanic plate of the lithosphere is added to by upwelling asthenosphere at a spreading ridge (left) and consumed at a subduction zone (right), causing stratovolcanoes at the convergent boundary with the continental plate.antle convection seems to have been much more active during the Hadean period, resulting in gravitational sorting of heavier molten iron, and nickel elements and sulphides in the core, and lighter silicate minerals in the mantle.
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Mantle convection Mantle convection is the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface. The Earth's surface lithosphere, which rides atop the asthenosphere (the two components of the upper mantle), is divided into a number of plates that are continuously being created and consumed at their opposite plate boundaries.
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- Answer 1: Volcanos are most commonly found at subduction zone boundaries. This is where the thinner oceanic plates get pulled under the thicker continental plates. As the plates go deeper, they melt and form pockets of magma which can cause mountains to be built and as the hot magma rises, it erupts out of volcanos.olcanos are most commonly found at subduction zone boundaries. This is where the thinner oceanic plates get pulled under the thicker continental plates. As the plates go deeper, they melt and form pockets of magma which can cause mountains to be built and as the hot magma rises, it erupts out of volcanos.
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Mantle convection A superplume generated by cooling processes in the mantle. Mantle convection is the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface. The Earth's surface lithosphere, which rides atop the asthenosphere, is divided into a number of plates that are continuously being created and consumed at their opposite plate boundaries. Accretion occurs as mantle is added to the growing edges of a plate, associated with seafloor spreading. This hot added material cools down b
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- Composite volcanoes most often are found near subduction zones.  They can be found at either oceanic-oceanic convergent plate  boundaries, oceanic-continental plate boundari … es, or  continental-continental plate boundaries. They are especially  prevalent in the Pacific Ring of Fire.omposite volcanoes are usually found at subduction zones, but can occasionally be found in spreading zones such as the East African Rift.
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Where are the most common places for Tsunamis to Occur?    Tsunamis occur as a result of seismic activity (earthquakes) at  tectonic plate boundaries, specifically ocean trenches or mid-ocean  ridges. Here, earthquakes and volcanic eruptions under the water  will cause the displacement of massive amounts of water and hence a  tsunami.  Tsunamis occur as a result of seismic activity (earthquakes) at  tectonic plate boundaries, specifically ocean trenches or mid-ocean  ridges. Here, earthquakes and volcanic eruptions under the water  will cause the displacement of massive amounts of water and hence a  tsunami.
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- Convection currents are identified in Earth's mantle. Heated mantle material is shown rising from deep inside the mantle, while cooler mantle material sinks, creating a convection current. It is thought that this type of current is responsible for the movements of the plates of Earth's crust.
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Mantle plumes and hotspots Above: sequences in the formation of a volcanic island above a mantle plume. Dating of islands in the Pacific chains gave an average plate movement of approximately 99mm per year over the last 90 million years, although there is no evidence to suggest that this rate of plate motion has been constant over time.
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Education and Careers Mantle Plumes. The estimated dates of the younger continental flood basalts compiled from recent sources are shown in Table 1. Several lines of evidence suggest that in most instances the greatest number of individual eruptions and the largest volumes of lava probably occurred within a million years or less.
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- Mid-oceanic ridge of the south Pacific. As the hot asthenosphere rises to shallow levels, it decompresses and melts to produce basalt magmas. These magmas pond in crustal magma chambers where they are periodically tapped by vertical fractures that provide conduits for the rapid rise of magma to the surface.
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Where Does Volcanic Activity Occur? Plate boundary volcanism. Volcanic activity occurs at two types of plate boundaries: mid-ocean ridges and subduction zones. At mid-ocean ridges, basaltic eruptions produce new sea-floor crust. These underwater eruptions don't produce big mountainous volcanoes, which is why they are often overlooked as the most volcanically active features on Earth.
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- Mantle plumes appear to be largely unaffected by plate motions. While a plume that feeds hot spot volcanoes remains stationary relative to the mantle, the plate above it usually moves. The result is that a chain of progressively older volcanoes are created on the overlying plate.
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- Most hotspots, also known as mantle plumes, occur beneath oceanic plates; Yellowstone, however, is a good example of a hotspot beneath a continental part of a plate. In Yellowstone, you can see bubbling fumaroles (vents from which volcanic gas escapes into the atmosphere) and hot water geysers like Old Faithful..
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- The Richest and Poorest Countries in the World, 2013 (Estimates-Data in Current International Dollar). Gross domestic product (GDP) based on purchasing-power-parity (PPP) per capita.
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- Mantle convection works to uplift rocks at mid-ocean ridges where they are exposed to less overburden and therefore, less pressure. As the pressure decreases, the rocks begin to melt. Mantle convection works to uplift rocks at mid-ocean ridges where they are exposed to less overburden and therefore, less pressure. As the pressure decreases, the rocks begin to melt.
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- volcanoes occur where they do because of the position of the crust over a plate boundary or a hot spot in the earth s mantle
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Oceanic crust Thicker than average crust is found above plumes as the mantle is hotter and hence it crosses the solidus and melts at a greater depth, creating more melt and a thicker crust. An example of this is Iceland which has crust of thickness ~20 km. The oceanic lithosphere subducts at what are known as convergent boundaries.ceanic crust is the result of erupted mantle material originating from below the plate, cooled and in most instances, modified chemically by seawater. This occurs mostly at mid-ocean ridges, but also at scattered hotspots, and also in rare but powerful occurences known as flood basalt eruptions.
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- Volcanoes occur where they do because of the position of the crust over a plate boundary or a 'hot spot' in the Earth's mantle. Continental volcanoes form when subducted cru … st melts to magma against the mantle, then is forced upward under pressure through cracks in the rocks above.
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- mantle convection. convection currents in the mantle that occur because hot rock in the lower part of the mantle is less dense and rises, and cooler rock in the upper part of the mantle cools, becomes more dense, and sinks. Mantle convection is thought to be the mechanism driving the movement of tectonic plates.
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What role does asthenosphere play in generating magma at a divergent boundary? Making the world better, one answer at a time. At an oceanic subduction zone, the athenosphere is subducted under continental lithosphere, or under other oceanic lithosphere. Friction between these plates causes heat that creates magmas. At a divergent boundary upwelling mantle (athenosphere) decompresses due to reduced pressures, allowing magma to form. This magma is extruded onto the seafloor as pillow basalts, and beneath the seafloors as massive gabbros and sheeted (gabbro) dikes. At an oceanic subduction zone, the athenosphere is subducted under continental lithosphere, or under other oceanic lithosphere.