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  Encyclopedia of Keywords > Liquids > Water > Islands > Volcanic Arc > Forearc   Michael Charnine

Keywords and Sections
FOREARCS
TRENCH
ARC
FLUIDS
AMP
PLATE
SUBDUCTION
SEAMOUNTS
SEDIMENT
SLAB
VOLCANIC ARC
EROSION
FORM
CASCADIA
FOREARC BASIN
OBLIQUE
ACCRETIONARY
CONTINUOUSLY
FOREARC
ACTIVE
CRUST
OCEAN CRUST
Review of Short Phrases and Links

    This Review contains major "Forearc"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. A forearc is a depression in the sea floor located between an accretionary wedge and a volcanic arc in a subduction zone, and lined with trapped sediment.
  2. A forearc is a depression in the sea floor located between a subduction zone and an associated volcanic arc. (Web site)
  3. A forearc is a depression in the sea floor located between a subduction zone and an associated volcanic arc. (Web site)
  4. The term "forearc" means along the outside of the semicircular line along which the plates converge, at the subduction trench.
  5. The term "forearc" means along the outside of the semicircular line along which the plates converge, at the subduction trench.

Forearcs

  1. Methane is often sequestered in an ice-like form ( methane clathrate, also called gas hydrate) in the forearc.
  2. Forearc canyons are the modern-day bathymetdc expression of these faults. (Web site)
  3. Arc-oblique strike-slip faults have been recognized in a number of forearc systems globally.
  4. Shallow Forearc earthquakes tend to have a normal fault mechanism, as expected by theory.

Trench

  1. In the south, near the mouth of the Orinoco River, there is no morphological trench and the forearc plus accretionary prism is almost 500 km wide.
  2. The inner trench wall marks the edge of the overriding plate and the outermost forearc.
  3. Subduction of large edifices (seamount tunneling) oversteepens the forearc, causing mass failures that carry debris towards and ultimately into the trench. (Web site)
  4. Northward the forearc narrows, the accretionary prism disappears, and only north of 17--N the morphology of a trench is seen.
  5. Subduction of large edifices (seamount tunneling) oversteepens the forearc, causing mass failures that carry debris towards and ultimately into the trench.

Arc

  1. The forearc lies between the trench and the volcanic arc.
  2. As the forearc of the arc and distal passive margin of NAM converged, folding occurred. (Web site)
  3. Ophiolites could represent forearc, early stage volcanic arc (see island arc or backarc lithosphere.
  4. Adding slices to the bottom of the subduction causes the complex to lift upward and a forearc basin forms between the complex and the volcanic arc.

Fluids

  1. These form where fluids released from the downgoing plate percolate upwards and interact with cold mantle lithosphere of the forearc. (Web site)
  2. Chemosynthetic communities thrive where cold fluids seep out of the forearc.
  3. These form where fluids released from the downgoing plate percolate upwards and interact with cold mantle lithosphere of the forearc.

Amp

  1. Fryer, P. & Fryer, G. J. (1987). Origin of non-volcanic seamounts in a forearc environment.
  2. Horine, R. L., Moore, G. F. & Taylor, B. (1990). Structure of the outer Izu-Bonin forearc from seismic-reflection profiling and gravity modeling.

Plate

  1. The overriding plate contains volcanic arc (generally) and a forearc.
  2. The inner trench wall marks the edge of the overriding plate and the outermost forearc.
  3. This transfers material from the forearc to the subducting plate and can be accomplished by frontal erosion or basal erosion.
  4. The Black Sea is forming in the forearc region of the convergent plate boundary between the African Plate and the Eurasian Plate. (Web site)

Subduction

  1. The forearc and subduction zone profiles are basically what one expects for a flexed elastic beam.
  2. Even subduction zones with fast convergence rates exceeding the rollback rate rarely show forearc damage. (Web site)

Seamounts

  1. The Mariana forearc is a non-accretionary forearc with numerous seamounts.
  2. Harzburgites from Torishima Forearc Seamount generally have lower HREE contents than harzburgites from Conical Seamount. (Web site)
  3. In Fig. 10 f, Torishima Forearc Seamount harzburgites plot on a trend for oxidized peridotites in the range 20-25% melting.
  4. In contrast, both harzburgites and dunites from Torishima Forearc Seamount are oxidized, with the dunites having slightly higher cr -number.
  5. Frontal erosion is most active in the wake of seamounts being subducted beneath the forearc.

Sediment

  1. Sediments accreted to the forearc are another source of fluids.
  2. Forearc basins receive sediments from the adjacent landmass, the island arc system, and trapped oceanic crustal material.

Slab

  1. Petrologic models suggest that dehydration and metamorphism of subducting slabs release water that serpentinizes the overlying forearc mantle.
  2. Benton, L.D., J.G. Ryan , and F. Tera (2001) Boron isotope systematics of slab fluids as inferred from a serpentinite seamount, Mariana forearc. (Web site)

Volcanic Arc

  1. The forearc lies between the trench and the volcanic arc.
  2. The overriding plate contains volcanic arc (generally) and a forearc.

Erosion

  1. Frontal erosion is most active in the wake of seamounts being subducted beneath the forearc.
  2. This transfers material from the forearc to the subducting plate and can be accomplished by frontal erosion or basal erosion.
  3. Subsidence of Lima Basin, part of the Peruvian forearc, is controlled by tectonic erosion by the subducting Nazca plate. (Web site)

Form

  1. Methane is often sequestered in an ice-like form ( methane clathrate, also called gas hydrate) in the forearc.
  2. These form where fluids released from the downgoing plate percolate upwards and interact with cold mantle lithosphere of the forearc.

Cascadia

  1. The weakness of the Cascadia subduction thrust fault and the unusual stress state of the forearc region have important implications for earthquake hazards. (Web site)
  2. The best-documented set of arc-oblique strike-slip faults occurs in the submarine portion of the Cascadia forearc.

Forearc Basin

  1. The actual contact between the converging plates is beneath the forearc basin, not at the trench. (Web site)
  2. Adding slices to the bottom of the subduction causes the complex to lift upward and a forearc basin forms between the complex and the volcanic arc. (Web site)
  3. The forearc basin is rarely deformed by contact between the converging plates because nearly all subduction zones are held in tension, not in compression. (Web site)

Oblique

  1. KIMURA, G. 1986. Oblique subduction and collision: forearc tectonics and the Kuril Arc.
  2. Margin-parallel shortening of the Cascadia forearc is a consequence of oblique subduction of the Juan de Fuca plate beneath North America.
  3. In other words, the globe must be peppered with "forearc sliver plates"; everywhere where plates converge at a shallow oblique angle.

Accretionary

  1. In the south, near the mouth of the Orinoco River, there is no morphological trench and the forearc plus accretionary prism is almost 500 km wide.
  2. Northward the forearc narrows, the accretionary prism disappears, and only north of 17--N the morphology of a trench is seen.
  3. The forearc basin and the accretionary wedge together occupy the arc-trench gap. (Web site)
  4. Padding by the wedges probably contributes to the rarity of forearc damage at subduction zones. (Web site)
  5. Basins filled with volcaniclastic sediments often form atop the forearc; below and trenchward is the accretionary wedge. (Web site)

Continuously

  1. Igneous basement of a nonaccretionary forearc may be continuously exposed by subduction erosion.
  2. The forearc is continuously subjected to subduction-related earthquakes.
  3. Igneous basement of a nonaccretionary forearc may be continuously exposed by subduction erosion.

Forearc

  1. Glacio-eustatic control on deep-marine clastic forearc sedimentation, pliocene-mid-Pleistocene (c.
  2. The existence of a hydrated forearc upper-mantle wedge in Cascadia has important geological and geophysical implications.
  3. A forearc is a depression in the sea floor located between an accretionary wedge and a volcanic arc in a subduction zone, and lined with trapped sediment.
  4. In other words, the globe must be peppered with "forearc sliver plates"; everywhere where plates converge at a shallow oblique angle.
  5. Northward the forearc narrows, the accretionary prism disappears, and only north of 17°N the morphology of a trench is seen. (Web site)

Active

  1. Frontal erosion is most active in the wake of seamounts being subducted beneath the forearc. (Web site)

Crust

  1. The inner trench slope of these convergent margins exposes the crust of the forearc, including basalt, gabbro, and serpentinized mantle peridotite. (Web site)

Ocean Crust

  1. The collisions that produce orogenies also sometimes trap fragments of ocean crust from the forearc or from the down-going plate in the mountain belt.

Categories

  1. Liquids > Water > Islands > Volcanic Arc
  2. Trench
  3. Subduction Zone
  4. Ocean Crust
  5. Glossaries > Glossary of Geology Stubs /
  6. Books about "Forearc" in Amazon.com

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  Short phrases about "Forearc"
  Originally created: March 24, 2008.
  Links checked: January 22, 2013.
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