When a tectonic plate subducts, does any of the subducted material melt, or is it just the mantle above the subducted slab that melts?Earth science
Asked by: Maria Molina
What happens to a subducting plate after it Subducts?
Once initiated, stable subduction is driven mostly by the negative buoyancy of the dense subducting lithosphere. The slab sinks into the mantle largely under its weight. Earthquakes are common along the subduction zone, and fluids released by the subducting plate trigger volcanism in the overriding plate.
What happens when one plate Subducts and melts beneath the other?
These plates collide, slide past, and move apart from each other. Where they collide and one plate is thrust beneath another (a subduction zone), the most powerful earthquakes, tsunamis, volcanic eruptions, and landslides occur.
Does the subducting plate melt?
The subducting plate never really melt. It just gets recycled into the mantle (the Asthenosphere to be more precise), which is in solid state. It is plastic and deformable enough to allow convection flows, but it is solid. Beside more mantle, something that forms from the subducting plate is magma.
What happens when plate Subducts and reaches the mantle?
As the subducted plate descends into the mantle it is gradually heated allowing the formation of magma. The magma that forms is andesitic in composition and begins to form when the subducted plate reaches a depth of 100 kilometres.
Why does the subducted plate melt?
In a subduction zone (like the Cascades or the Andes), where an oceanic plate slides down under another plate, that downgoing slab releases its water as it heats up. That water then rises up into the mantle above it, causing it to melt at a lower temperature and, bam!
How does plate subduction cause melting?
Far beneath the mountains, the descending plate has carried seawater down with it. As the plate heats up from friction and from exposure to the hot mantle, the water is expelled. The presence of water lowers the melting point of the surrounding rocks and magma begins to form.
Where does a subducted slab melt?
subduction. Temperature at the plate surface increases steeply to the depth of-70 km as the subduction continues, and slab- melts is likely to be generated at levels above that depth in the subducting plate. Temperature in the mantle wedge is higher than -1100 °C where the subducting plate is deeper than-60 km.
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Why do subducting slabs partially melt despite their low temperatures?
Fluids released from dehydration reactions occurring in subducting slabs trigger partial melting in the mantle wedge. The resulting magma rises through the overlying mantle wedge and lithosphere and forms arc volcanoes at subduction zones.
What is happening in the mantle beneath a subduction zone?
When two tectonic plates meet at a subduction zone and one slides underneath the other, this lithosphere material curves down into the hot mantle. This subduction process frequently occurs because of the two different types of lithosphere that make up tectonic plates: Continental and oceanic.
What causes the mantle to melt?
This hot material rises to an area of lower pressure through the process of convection. Areas of lower pressure always have a lower melting point than areas of high pressure. This reduction in overlying pressure, or decompression, enables the mantle rock to melt and form magma.
How does the mantle melt?
As mantle ascends beneath the mid-ocean ridge, less and less rock lies above it, so large pressure changes occur, which leads to melting. The melt is less dense than the solid, and rises to the surface to form the oceanic crust.
Why does melting occur at subduction zones quizlet?
o Why does melting of mantle rock occur at subduction zones? Water released by pressurized wet lithosphere causes partial melting, melting mantle rock and causing it to rise up and break through the Earth’s crust.
What happens to the subducting slab?
As two massive plates collide, one can give way and slide under the other in a process called subduction. The subducted slab then slips down through the Earth’s viscous mantle, like a flat stone through a pool of honey.
What 2 things happen as a subducting plate sinks back into the earth?
Earthquakes occur at all plate boundaries, but deep-focus earthquakes occur mainly at convergent subduction zones. The subducting oceanic plate can penetrate deep into the mantle, which can result in large earthquakes. Earthquakes are also associated with tsunamis if the former occurs near or under the ocean floor.
What forms when one tectonic plate subducts under another?
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. Deep trenches are features often formed where tectonic plates are being subducted and earthquakes are common at subduction zones as well.
What does Subduct mean?
to take away; subtract
1. to take away; subtract. 2. to withdraw; remove.
Which statement best describes subduction?
What sentence best describes subduction? One plate sinks beneath the other.
Which statement describes the process of subduction?
Answer: One plate slides beneath another due to gravitational pull.
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