is a geological process in which the oceanic lithosphere
into the Earth's mantle
at convergent boundaries
. Where the oceanic lithosphere of a tectonic plate
converges with the less dense lithosphere of a second plate, the heavier plate dives beneath the second plate and sinks into the mantle. A region where this process occurs is known as a subduction zone
, and its surface expression is known as an arc-trench complex
. The process of subduction has created most of the Earth's continental crust.
Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately two to eight centimeters per year along most plate boundaries.
Diagram of the geological process of subduction
Subduction is possible because the cold oceanic lithosphere
is slightly more dense than the underlying asthenosphere
, the hot, ductile layer in the upper mantle
underlying the cold, rigid lithosphere. 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.
are common along the subduction zone, and fluids released by the subducting plate trigger volcanism
in the overriding plate. If the subducting plate sinks at a shallow angle, the overriding plate develops a belt
characterized by crustal thickening, mountain building
, and metamorphism. Subduction at a steeper angle is characterized by the formation of back-arc basins
Subduction and plate tectonics
The lithosphere consists of the outermost light crust
plus the uppermost rigid portion of the mantle
. Oceanic lithosphere ranges in thickness from just a few km for young lithosphere created at mid-ocean ridges
to around 100 km (62 mi) for the oldest oceanic lithosphere.
Continental lithosphere is up to 200 km (120 mi) thick.
The lithosphere is relatively cold and rigid compared with the underlying asthenosphere
, and so tectonic plates move as solid bodies atop the asthenosphere. Individual plates often include both regions of the oceanic lithosphere and continental lithosphere.
Subduction zones are where the cold oceanic lithosphere sinks back into the mantle and is recycled.
They are found at convergent plate boundaries, where the oceanic lithosphere of one plate converges with the less dense lithosphere of another plate. The heavier oceanic lithosphere is overridden by the leading edge of the other plate.
The overridden plate (the slab
) sinks at an angle of approximately twenty-five to seventy-five degrees to Earth's surface.
This sinking is driven by the temperature difference between the slab and the surrounding asthenosphere, as the colder oceanic lithosphere has, on average, a greater density. Sediments
and some trapped water are carried downwards by the slab and recycled into the deep mantle.
Earth is so far the only planet where subduction is known to occur, and subduction zones are its most important tectonic feature. Subduction is the driving force behind plate tectonics
, and without it, plate tectonics could not occur.
Oceanic subduction zones are located along 55,000 km (34,000 mi) of convergent plate margins,
almost equal to the cumulative 60,000 km (37,000 mi) of mid-ocean ridges.
Structure of subduction zones
The surface expression of subduction zones are arc-trench complexes. On the ocean side of the complex, where the subducting plate first approaches the subduction zone, there is often an outer trench high
or outer trench swell
. Here the plate shallows slightly before plunging downwards, as a consequence of the rigidity of the plate.
The point where the slab begins to plunge downwards is marked by an oceanic trench
. Oceanic trenches are the deepest parts of the ocean floor.
Beyond the trench is the forearc
portion of the overriding plate. Depending on sedimentation rates, the forearc may include an accretionary wedge
of sediments scraped off the subducting slab and accreted to the overriding plate. However, not all arc-trench complexes have an accretionary wedge. Accretionary arcs have a well-developed forearc basin behind the accretionary wedge, while the forearc basin is poorly developed in non-accretionary arcs.
Beyond the forearc basin, volcanoes are found in long chains called volcanic arcs
. The subducting basalt and sediment are normally rich in hydrous
minerals and clays. Additionally, large quantities of water are introduced into cracks and fractures created as the subducting slab bends downward.
During the transition from basalt to eclogite, these hydrous materials break down, producing copious quantities of water, which at such great pressure and temperature exists as a supercritical fluid
The supercritical water, which is hot and more buoyant than the surrounding rock, rises into the overlying mantle, where it lowers the melting temperature of the mantle rock, generating magma
via flux melting
The magmas, in turn, rise as diapirs
because they are less dense than the rocks of the mantle.
The mantle-derived magmas (which are initially basaltic in composition) can ultimately reach the Earth's surface, resulting in volcanic eruptions. The chemical composition of the erupting lava depends upon the degree to which the mantle-derived basalt interacts with (melts) Earth's crust or undergoes fractional crystallization
. Arc volcanoes tend to produce dangerous eruptions because they are rich in water (from the slab and sediments) and tend to be extremely explosive. Krakatoa
, Nevado del Ruiz
, and Mount Vesuvius
are all examples of arc volcanoes. Arcs are also associated with most ore
Beyond the volcanic arc is a back-arc region
whose character depends strongly on the angle of subduction of the subducting slab. Where this angle is shallow, the subducting slab drags the overlying continental crust, producing a zone of compression
in which there may be extensive folding
and thrust faulting
. If the angle of subduction is deep, the crust will be put in tension
instead, often producing a back-arc basin
Subduction typically occurs at a moderately steep angle right at the point of the convergent plate boundary. However, anomalous shallower angles of subduction are known to exist as well as some that are extremely steep.
(subducting angle less than 30°) occurs when the slab subducts nearly horizontally. The relatively flat slab can extend for hundreds of kilometers. That is abnormal, as the dense slab typically sinks at a much steeper angle. Because subduction of slabs to depth is necessary to drive subduction zone volcanism, flat-slab subduction can be invoked to explain volcanic gaps
The Laramide Orogeny
in the Rocky Mountains
of the United States
is attributed to flat-slab subduction.
During this orogeny, a broad volcanic gap appeared at the southwestern margin of North America, and deformation occurred much farther inland; it was during this time that the basement
-cored mountain ranges of Colorado, Utah, Wyoming, South Dakota, and New Mexico came into being. The most massive subduction zone earthquakes, so-called "megaquakes", have been found to occur in flat-slab subduction zones.
Steep-angle subduction (subducting angle greater than 70°) occurs in subduction zones where Earth's oceanic crust
and lithosphere are old and thick and have, therefore, lost buoyancy. The steepest dipping subduction zone lies in the Mariana Trench
, which is also where the oceanic crust, of Jurassic
age, is the oldest on Earth exempting ophiolites
. Steep-angle subduction is, in contrast to flat-slab subduction, associated with back-arc
of crust, creating volcanic arcs and pulling fragments of continental crust away from continents to leave behind a marginal sea
Life cycle of subduction zones
Although stable subduction is fairly well understood, the process by which subduction is initiated remains a matter of discussion and continuing study. Subduction can begin spontaneously if the denser oceanic lithosphere can founder and sink beneath the adjacent oceanic or continental lithosphere through vertical forcing only; alternatively, existing plate motions can induce new subduction zones by horizontally forcing the oceanic lithosphere to rupture and sink into the asthenosphere.
Both models can eventually yield self-sustaining subduction zones, as the oceanic crust is metamorphosed at great depth and becomes denser than the surrounding mantle rocks. The compilation of subduction zone initiation events back to 100 Ma suggests horizontally-forced subduction zone initiation for most modern subduction zones,
which is supported by results from numerical models
and geologic studies.
Some analogue modeling
shows, however, the possibility of spontaneous subduction from inherent density differences between two plates at specific locations like passive margins.
There is evidence this has taken place in the Izu-Bonin-Mariana subduction system.
Earlier in Earth's history, subduction is likely to have initiated without horizontal forcing due to the lack of relative plate motion, though an unorthodox proposal by A. Yin suggests that meteorite impacts may have contributed to subduction initiation on early Earth.
End of subduction
Subduction can continue as long as the oceanic lithosphere moves into the subduction zone. However, the arrival of buoyant crust at a subduction zone can result in its failure, by disrupting downwelling. The arrival of continental crust results in a collision
or terrane accretion
that disrupts subduction.
Continental crust can subduct to depths of 100 km (62 mi) or more but then resurfaces.
Sections of crustal or intraoceanic arc crust greater than 15 km (9.3 mi) in thickness or oceanic plateau greater than 30 km (19 mi) in thickness can disrupt subduction. However, island arcs subducted end-on may cause only local disruption, while an arc arriving parallel to the zone can shut it down.
This has happened with the Ontong Java Plateau and the Vitiaz Trench.
Subduction zones host a unique variety of rock types created by the high-pressure, low-temperature conditions a subducting slab encounters during its descent.
The metamorphic conditions the slab passes through in this process creates and destroys water bearing (hydrous) mineral phases, releasing water into the mantle. This water lowers the melting point of mantle rock, initiating melting.
Understanding the timing and conditions in which these dehydration reactions occur, is key to interpreting mantle melting, volcanic arc magmatism, and the formation of continental crust.
A metamorphic facies
is characterized by a stable mineral assemblage specific to a pressure-temperature range and specific starting material. Subduction zone metamorphism
is characterized by a low temperature, high-ultrahigh pressure metamorphic
path through the zeolite
, prehnite-pumpellyite, blueschist
, and eclogite
facies stability zones of subducted oceanic crust.Zeolite
and prehnite-pumpellyite facies assemblages may or may not be present, thus the onset of metamorphism may only be marked by blueschist facies conditions.
Subducting slabs are composed of basaltic crust topped with pelagic sediments
however, the pelagic sediments may be accreted onto the forearc-hanging wall and not subducted.
Most metamorphic phase transitions that occur within the subducting slab are prompted by the dehydration of hydrous mineral phases. The breakdown of hydrous mineral phases typically occurs at depths greater than 10 km.
Each of these metamorphic facies is marked by the presence of a specific stable mineral assemblage, recording the metamorphic conditions undergone but the subducting slab. Transitions between facies causes hydrous minerals to dehydrate at certain pressure-temperature conditions and can therefore be tracked to melting events in the mantle beneath a volcanic arc.
that occur above subduction zones, such as Mount St. Helens
, Mount Etna
, and Mount Fuji
, lie approximately one hundred kilometers from the trench in arcuate chains called volcanic arcs
. Two kinds of arcs are generally observed on Earth: island arcs
that form on the oceanic lithosphere (for example, the Mariana
and the Tonga
island arcs), and continental arcs
such as the Cascade Volcanic Arc
, that form along the coast of continents. Island arcs (intraoceanic or primitive arcs) are produced by the subduction of oceanic lithosphere beneath another oceanic lithosphere (ocean-ocean subduction) while continental arcs (Andean arcs) form during the subduction of oceanic lithosphere beneath a continental lithosphere (ocean-continent subduction).
An example of a volcanic arc having both island and continental arc sections is found behind the Aleutian Trench
subduction zone in Alaska.
The arc magmatism occurs one hundred to two hundred kilometers from the trench and approximately one hundred kilometers above the subducting slab. This depth of arc magma
generation is the consequence of the interaction between hydrous fluids, released from the subducting slab, and the arc mantle wedge that is hot enough to melt with the addition of water.
It has also been suggested that the mixing of fluids from a subducted tectonic plate and melted sediment is already occurring at the top of the slab before any mixing with the mantle takes place.
Arcs produce about 10% of the total volume of magma produced each year on Earth (approximately 0.75 cubic kilometers), much less than the volume produced at mid-ocean ridges,
but they have formed most continental crust
Arc volcanism has the greatest impact on humans because many arc volcanoes lie above sea level and erupt violently. Aerosols
injected into the stratosphere during violent eruptions can cause rapid cooling of Earth's climate
and affect air travel.
Earthquakes and tsunamis
Global map of subduction zones, with subducted slabs contoured by depth
The strains caused by plate convergence in subduction zones cause at least three types of earthquakes. These are deep earthquakes, megathrust earthquakes, and outer rise earthquakes.
Anomalously deep events are a characteristic of subduction zones, which produce the deepest quakes on the planet. Earthquakes are generally restricted to the shallow, brittle parts of the crust, generally at depths of less than twenty kilometers. However, in subduction zones, quakes occur at depths as great as 700 km (430 mi). These quakes define inclined zones of seismicity known as Wadati–Benioff zones
which trace the descending slab.
Nine of the ten largest earthquakes of the last 100 years were subduction zone megathrust earthquakes, which included the 1960 Great Chilean earthquake
, which, at M 9.5, was the largest earthquake ever recorded; the 2004 Indian Ocean earthquake and tsunami
; and the 2011 Tōhoku earthquake and tsunami
. The subduction of cold oceanic crust into the mantle depresses the local geothermal gradient
and causes a larger portion of Earth to deform in a more brittle fashion than it would in a normal geothermal gradient setting. Because earthquakes can occur only when a rock is deforming in a brittle fashion, subduction zones can cause large earthquakes. If such a quake causes rapid deformation of the sea floor, there is potential for tsunamis
, such as the earthquake caused by subduction of the Indo-Australian Plate under the Euro-Asian Plate on December 26, 2004, that devastated the areas around the Indian Ocean
. Small tremors which cause small, nondamaging tsunamis, also occur frequently.
A study published in 2016 suggested a new parameter to determine a subduction zone's ability to generate mega-earthquakes.
By examining subduction zone geometry and comparing the degree of curvature of the subducting plates in great historical earthquakes such as the 2004 Sumatra-Andaman and the 2011 Tōhoku earthquake, it was determined that the magnitude of earthquakes in subduction zones is inversely proportional to the degree of the fault's curvature, meaning that "the flatter the contact between the two plates, the more likely it is that mega-earthquakes will occur."
earthquakes occur when normal faults oceanward of the subduction zone are activated by flexure of the plate as it bends into the subduction zone.
The 2009 Samoa earthquake
is an example of this type of event. Displacement of the sea floor caused by this event generated a six-meter tsunami in nearby Samoa.
has helped detect subducted lithosphere, slabs, deep in the mantle where there are no earthquakes. About one hundred slabs have been described in terms of depth and their timing and location of subduction.
The great seismic discontinuities in the mantle, at 410 km (250 mi) depth and 670 km (420 mi), are disrupted by the descent of cold slabs in deep subduction zones. Some subducted slabs seem to have difficulty penetrating the major discontinuity
that marks the boundary between the upper mantle and lower mantle at a depth of about 670 kilometers. Other subducted oceanic plates have sunk to the core-mantle boundary
at 2890 km depth. Generally, slabs decelerate during their descent into the mantle, from typically several cm/yr (up to ~10 cm/yr in some cases) at the subduction zone and in the uppermost mantle, to ~1 cm/yr in the lower mantle.
This leads to either folding or stacking of slabs at those depths, visible as thickened slabs in Seismic tomography
. Below ~1700 km, there might be a limited acceleration of slabs due to lower viscosity as a result of inferred mineral phase changes until they approach and finally stall at the core-mantle boundary
Here the slabs are heated up by the ambient heat and are not detected anymore ~300 Myr after subduction.
Orogeny is the process of mountain building. Subducting plates can lead to orogeny by bringing oceanic islands, oceanic plateaus, and sediments to convergent margins. The material often does not subduct with the rest of the plate but instead is accreted (scraped off) to the continent, resulting in exotic terranes
. The collision of this oceanic material causes crustal thickening and mountain-building. The accreted material is often referred to as an accretionary wedge
or prism. These accretionary wedges can be identified by ophiolites
(uplifted ocean crust consisting of sediments, pillow basalts, sheeted dykes, gabbro, and peridotite).
Subduction may also cause orogeny without bringing in oceanic material that collides with the overriding continent. When the subducting plate subducts at a shallow angle underneath a continent (something called "flat-slab subduction"), the subducting plate may have enough traction on the bottom of the continental plate to cause the upper plate to contract to lead to folding, faulting, crustal thickening, and mountain building. Flat-slab subduction causes mountain building and volcanism moving into the continent, away from the trench, and has been described in North America (i.e. Laramide orogeny), South America, and East Asia.
The processes described above allow subduction to continue while mountain building happens progressively, which is in contrast to continent-continent collision orogeny, which often leads to the termination of subduction.
Beginnings of subduction on Earth
is a rock typical for present-day subduction settings. The absence of blueschist older than Neoproterozoic
reflects more magnesium-rich
compositions of Earth's oceanic crust
during that period.
These more magnesium-rich rocks metamorphose into greenschist
at conditions when modern oceanic crust rocks metamorphose into blueschist.
The ancient magnesium-rich rocks mean that Earth's mantle
was once hotter, but not that subduction conditions were hotter. Previously, the lack of pre-Neoproterozoic blueschist was thought to indicate a different type of subduction.
Both lines of evidence refute previous conceptions of modern-style subduction having been initiated in the Neoproterozoic Era
1.0 Ga ago.
History of investigation
First geologic attestations of the "subduct" words date to 1970,
In ordinary English to subduct
, or to subduce
(from Latin subducere
, “to lead away”)
are transitive verbs
requiring a subject to perform an action on an object not itself, here the lower plate, which has then been subducted
(“removed”). The geological term is "consumed," which happens the geological moment the lower plate slips under, even though it may persist for some time until its remelting and dissipation. In this conceptual model, plate is continually being used up.
The identity of the subject, the consumer, or agent of consumption, is left unstated. Some sources accept this subject-object construct.
Geology makes to subduct
into an intransitive verb
and a reflexive verb
. The lower plate itself is the subject. It subducts, in the sense of retreat, or removes itself, and while doing so, is the "subducting plate." Moreover, the word slab
is specifically attached to the "subducting plate," even though in English the upper plate is just as much of a slab.
The upper plate is left hanging, so to speak. To express it geology must switch to a different verb, typically to override
. The upper plate, the subject, performs the action of overriding the object, the lower plate, which is overridden.
Subduction zones are important for several reasons:
- Subduction zone physics: Sinking of the oceanic lithosphere (sediments, crust, mantle), by the contrast of density between the cold and old lithosphere and the hot asthenospheric mantle wedge, is the strongest force (but not the only one) needed to drive plate motion and is the dominant mode of mantle convection.
- Subduction zone chemistry: The subducted sediments and crust dehydrate and release water-rich (aqueous) fluids into the overlying mantle, causing mantle melting and fractionation of elements between the surface and deep mantle reservoirs, producing island arcs and continental crust. Hot fluids in subduction zones also alter the mineral compositions of the subducting sediments and potentially the habitability of the sediments for microorganisms.
- Subduction zones drag down subducted oceanic sediments, oceanic crust, and mantle lithosphere that interact with the hot asthenospheric mantle from the over-riding plate to produce calc-alkaline series melts, ore deposits, and continental crust.
- Subduction zones pose significant threats to lives, property, economic vitality, cultural and natural resources, and quality of life. The tremendous magnitudes of earthquakes or volcanic eruptions can also have knock-on effects with global impact.
Subduction zones have also been considered as possible disposal sites for nuclear waste
in which the action of subduction itself would carry the material into the planetary mantle
, safely away from any possible influence on humanity or the surface environment. However, that method of disposal is currently banned by international agreement.
Furthermore, plate subduction zones are associated with very large megathrust earthquakes
, making the effects of using any specific site for disposal unpredictable and possibly adverse to the safety of long-term disposal.
- Divergent boundary – Linear feature that exists between two tectonic plates that are moving away from each other
- Divergent double subduction – Two parallel subduction zones with different directions are developed on the same oceanic plate
- List of tectonic plate interactions – Definitions and examples of the interactions between the relatively mobile sections of the lithosphere
- Obduction – The overthrusting of oceanic lithosphere onto continental lithosphere at a convergent plate boundary
- Paired metamorphic belts – Sets of juxtaposed linear rock units that display contrasting metamorphic mineral assemblages
- Ring of Fire – Area of high earthquake and volcanic activity, also the circum-Pacific belt
- Slab window – A gap that forms in a subducted oceanic plate when a mid-ocean ridge meets with a subduction zone and the ridge is subducted
- Wilson Cycle – Geophysical model of the opening and closing of rifts
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