Chloe Zhang
The asthenosphere is a weak zone within the upper mantle, underlying the lithosphere, where the mantle rocks deform by plastic flow in response to applied stresses. The plasticity of the asthenosphere is due to the interaction of temperature and pressure on asthenospheric materials. This gives them a plastic-like quality, with much less rigidity than the lithosphere above it. The melting point and pressure balance in the asthenosphere have led geologists to infer that a significant portion of the asthenospheric material may be molten, with the rest being highly susceptible to melting. This plasticity allows the asthenosphere to form divergent and convergent boundaries, enabling tectonic plates to move through sea floor spreading and subduction zones.
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What You'll Learn
- The asthenosphere's plastic-like quality is due to the interaction of temperature and pressure on its materials
- The plasticity allows for the movement of tectonic plates, causing sea floor spreading and subduction zones
- The asthenosphere is heated by contact with the hot materials of the mesosphere
- The viscosity of the asthenosphere is similar to the underlying mantle, but it is more fluid than the overlying lithosphere
- The plasticity of the asthenosphere contributes to the formation of divergent and convergent boundaries
The asthenosphere's plastic-like quality is due to the interaction of temperature and pressure on its materials
The asthenosphere is a weak zone within the upper mantle, underlying the lithosphere. It is a fluid layer that allows the lithospheric plates to move across the surface of the earth. The material of which the asthenosphere is composed can be described as plastic-like, with much less rigidity than the lithosphere above it. This plastic-like quality is due to the interaction of temperature and pressure on its materials.
The melting point of a rock is a function of the pressure exerted on it. As the pressure on a material increases, so does its melting point. The asthenosphere is heated by contact with the hot materials of the mesosphere beneath it. The temperature of the mesosphere is not constant, and in regions where it is warmer than average, the asthenosphere may be heated to the point of local melting. The melting point and pressure balance in the asthenosphere suggest that as much as 10% of its material may be molten. The rest is close to being molten, and modest changes in pressure or temperature may cause further melting.
The plasticity of the asthenosphere allows for the movement of tectonic plates through sea-floor spreading and subduction zones. Tectonic plates can move apart in a process known as divergence or collide in a process known as convergence. The plasticity of the asthenosphere also allows for convection motions to take place.
The asthenosphere is commonly considered to be coincident with the upper-mantle seismic low-velocity zone. Seismic studies have shown that S-waves slow down significantly as they reach a depth of about 62 miles (100 km) beneath the Earth's surface. This depth is taken as an indication of the boundary of the asthenosphere.
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The plasticity allows for the movement of tectonic plates, causing sea floor spreading and subduction zones
The asthenosphere is a weak zone within the upper mantle, underlying the lithosphere. It is composed of plastic-like material, which is less rigid than the lithosphere above it. This property is caused by the interaction of temperature and pressure on asthenospheric materials. Any rock will melt if its temperature is raised sufficiently, but the melting point of a rock is also a function of the pressure exerted on it. As pressure increases, so too does the melting point of the rock.
The plasticity of the asthenosphere allows for the movement of tectonic plates. The lithosphere is made up of a small number of rigid and relatively cool slabs known as plates. These plates are able to move along the top of the plastic asthenosphere. This movement causes sea floor spreading and subduction zones. The plasticity of the asthenosphere allows for the formation of divergent and convergent boundaries. When plates move apart, this is known as sea floor spreading, and when they collide, this is known as a subduction zone.
The asthenosphere is heated by contact with the hot materials of the mesosphere beneath it. The temperature of the mesosphere is not constant, and in regions where it is warmer than average, the asthenosphere may be heated to the point of local melting. This melting further contributes to the plasticity of the asthenosphere.
The viscosity of the asthenosphere is estimated to be 10^21–22 poise, which is the same as the underlying mantle. However, the asthenosphere is much more fluid than the overlying lithosphere, allowing for the movement of tectonic plates. This movement of plates results in the formation of mountains, as well as earthquakes along fault lines.
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The asthenosphere is heated by contact with the hot materials of the mesosphere
The asthenosphere is a part of the upper mantle of the Earth, lying below the lithosphere. It is a weak and ductile region, extending from about 100 km (60 miles) to about 700 km (430-450 miles) below the Earth's surface. The lithosphere, in contrast, is rigid and brittle. The temperature and pressure conditions in the asthenosphere cause rock to become ductile, enabling it to flow like a convection current. This flow of the asthenosphere allows the movement of tectonic plates, with the rigid lithosphere "floating" or moving on top of it.
The interaction of temperature and pressure on asthenospheric materials gives it a plastic-like quality. The melting point of rock is influenced by both temperature and pressure. While an increase in temperature can lead to melting, a concurrent increase in pressure can raise the melting point of the rock. This complex interplay between temperature and pressure results in the plastic-like behaviour of the asthenosphere.
The plasticity of the asthenosphere is crucial in the movement of tectonic plates. When two plates converge and move towards each other, the asthenosphere may be exposed to increased pressure. This pressure causes the asthenosphere to flow downward, allowing one plate to slide over the other. The downward movement of the heavier plate generates heat, causing melting and the formation of molten rock, which then flows upward to the Earth's surface. This process contributes to the formation of mountain ranges and island arcs.
The weak and ductile nature of the asthenosphere, influenced by its heating from the mesosphere and the resulting partial melting, plays a critical role in the dynamic nature of the Earth's lithospheric plates and the geological processes associated with them.
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The viscosity of the asthenosphere is similar to the underlying mantle, but it is more fluid than the overlying lithosphere
The asthenosphere is a weak zone within the upper mantle, underlying the lithosphere. It is situated at an average depth of about 62 miles (100 kilometres) beneath the Earth's surface. The lithosphere-asthenosphere boundary (LAB) is the point where the difference in ductility between the two layers of the upper mantle is marked. The viscosity of the asthenosphere is of the order of 1021-22 poise, which is similar to the underlying mantle but much more fluid than the overlying lithosphere.
The lithosphere is the outer layer of rock-like material, and it includes both the crust and the upper portion of the mantle. The temperature of the lithosphere is less than 1,300°C (2,372°F). The asthenosphere, on the other hand, includes the portion of the mantle with temperatures above 1,300°C (2,372°F). The top of the asthenosphere is marked by a change in the velocity of seismic waves known as S-waves.
The material of which the asthenosphere is composed can be described as plastic-like, with much less rigidity than the lithosphere above it. This property is caused by the interaction of temperature and pressure on asthenospheric materials. The melting point of any rock is a function of the pressure exerted on it; as pressure increases, so does the melting point. The temperature of the rocks that constitute the asthenosphere is below their melting point, but modest changes in pressure or temperature may cause further melting.
The asthenosphere is heated by contact with the hot materials that make up the mesosphere beneath it. The mesosphere is not a constant temperature and is hotter in some places than others. In regions where the mesosphere is warmer than average, the extra heat may increase the extent to which the asthenosphere is heated, and local melting may occur. The asthenosphere plays a critical role in the movement of the Earth's tectonic plates. The lithospheric plates "float" on the asthenosphere, and their very slow motion causes plate tectonics.
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The plasticity of the asthenosphere contributes to the formation of divergent and convergent boundaries
The asthenosphere is a weak zone within the upper mantle, underlying the lithosphere. It is composed of plastic-like material, which is less rigid than the lithosphere above it. This property is caused by the interaction of temperature and pressure on asthenospheric materials. The plasticity of the asthenosphere allows the plates to move through sea-floor spreading and subduction zones. This movement of plates forms divergent and convergent boundaries.
The asthenosphere is heated by contact with the hot materials that make up the mesosphere beneath it. The temperature of the mesosphere is not constant, and in regions where it is warmer than average, the extra heat increases the extent to which the asthenosphere is heated, and local melting may occur. The melting point and pressure balance in the asthenosphere have led geologists to infer that as much as 10% of the asthenospheric material may be molten. The rest is close to being molten, and modest changes in pressure or temperature may cause further melting.
The lithosphere, which consists of a small number of rigid and relatively cool slabs known as plates, floats on this plasticity zone called the asthenosphere. The plasticity of the asthenosphere allows these lithospheric plates to move. The plates can move apart in a process known as sea-floor spreading, forming divergent boundaries. Alternatively, the plates can collide, forming convergent boundaries.
The plasticity of the asthenosphere is also responsible for driving convection and subduction. Convection occurs when heated materials in the asthenosphere rise, while cooler materials sink. This creates a cycle of heated materials rising and cooling, then sinking and heating up again. Subduction occurs when one tectonic plate is forced beneath another and sinks into the asthenosphere. This process is possible due to the plasticity of the asthenosphere, which allows the plates to move and converge.
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Frequently asked questions
The asthenosphere is a weak zone within the upper mantle, underlying the lithosphere, where the mantle rocks deform by plastic flow in response to applied stresses. The plasticity of the asthenosphere is caused by the interaction of temperature and pressure on asthenospheric materials.
The plasticity of the asthenosphere allows the plates to move through sea floor spreading and subduction zones. Tectonic plates float on the plastic-like quality of the asthenosphere, which is less rigid than the lithosphere above it.
The asthenosphere is composed of molten and near-molten material. The melting point and pressure balance in the asthenosphere mean that as much as 10% of its material may be molten.
