The region between an oceanic trench and the associated volcanic arc
Cross-section of a subduction zone and back-arc basin. The forearc is the region between the trench and the volcanic arc.
Forearc is a plate tectonic term referring to a region in a subduction zone between an oceanic trench and the associated volcanic arc. Forearc regions are present along convergent margins and eponymously form 'in front of' the volcanic arcs that are characteristic of convergent plate margins. A back-arc region is the companion region behind the volcanic arc.
Many forearcs have an accretionary wedge which may form a topographic ridge known as an outer arc ridge that parallels the volcanic arc. A forearc basin between the accretionary wedge and the volcanic arc can accumulate thick deposits of sediment, sometimes referred to as an outer arc trough. Due to collisional stresses as one tectonic plate subducts under another, forearc regions are sources for powerful earthquakes.[1][2]
^Fuller, C. W; Willet, S.D.; Brandon, M.T. (2006). "Formation of forearc basins and their influence on subduction zone earthquakes". Geology. 34 (2): 65–68. Bibcode:2006Geo....34...65F. doi:10.1130/g21828.1.
^Kearey, Philip; Klepeis, A. Keith; Fredrick, Vine J. (2009). Global Tectonics (3rd ed.). Singapore by Moarkono: J. Wiley. pp. 1–400. ISBN 978-1-4051-0777-8.
Forearc is a plate tectonic term referring to a region in a subduction zone between an oceanic trench and the associated volcanic arc. Forearc regions...
Brian; Goodliffe, Andrew (2000). "Bathymetry of the Tonga Trench and Forearc: A Map Series". Marine Geophysical Researches. 21 (5): 489–512. Bibcode:2000MarGR...
Arc and South China, where accreted portions of the Luzon Arc and Luzon forearc form the eastern Coastal Range and parallel inland Longitudinal Valley...
the first. The created ophiolite becomes the tip of the new subduction's forearc and is uplifted (over the accretionary wedge) by detachment and compression...
plates leads to strike slip deformation of the forearc, thus forming a series of features including forearc slivers and strike slip fault systems that are...
deep-sea sediments eroded from the neighboring island arcs and deposited in a forearc basin. Greenstone belts, which include both types of metamorphosed rock...
tectonics has created accommodation space for sediments to accumulate. Forearc basins tend to accumulate sand rich in lithic grains and plagioclase. Intracontinental...
portions of the range are over 60 million years old, with volcanics and a forearc basin as the primary mountain building processes responsible for the range...
communities. Archaea are not abundant in this habitat, except in the Mariana forearc, where they dominate. Epsilonproteobacteria and Zetaproteobacteria are...
tectonic structures. One example is the Lesser Antilles Trough, which is the forearc basin of the Lesser Antilles subduction zone. Also not a trench is the...
Australian continental margin that are accreted to the Banda Arc. It occupies a forearc position in front of the active volcanic arc that forms the islands in...
Permeable pathways form for hydrothermal fluids to penetrate and precipitate gold bearing quartz-carbonate veins in forearc, arc, and back-arc regions....
Trench and the Vigan-Agao Fault in the Philippines. It is a well-developed forearc basin formed in front of the Luzon Volcanic Arc, an island arc system....
propagate further following the crustal thinning via normal faulting. Forearc basins form in subduction zones as sedimentary material is scraped off...
of an arc. Some terranes, such as the Quetico Terrane, were forearcs in the past. A forearc is the region between the volcanic arc and the subduction zone...
well-developed forearc basin behind the accretionary wedge, while the forearc basin is poorly developed in non-accretionary arcs. Beyond the forearc basin, volcanoes...
channel to the surface. These mud volcanoes are large features on the forearc, the largest of which has a diameter of ~50 kilometres (31 mi) and is over...
active forearcs that indicate (1) backthrusting is common, (2) forearc basins are nearly ubiquitous associates of accretionary wedges, and (3) forearc basement...
the ancestor of the Hellenic Trench. The result was the raising of the forearc and the "exhumation" of Peloponnesus and Crete. It began to migrate to...
the Great Sumatra fault) developed on the landward side of the Sunda forearc to absorb part of the dextral motions associated with the oblique plate...
water poor in carbon dioxide. This occurs at mid-ocean ridges and in the forearc mantle of subduction zones. The final mineral composition of serpentinite...
volcanoes along many mid ocean ridges, and within back-arc basins and forearc rifts. Mineral exploration companies are exploring for seafloor massive...
Joseph R.; Emmel, Frans J. (1982). "Sedimentation in the Sunda Trench and forearc region". Geological Society, London, Special Publications. 10 (1): 245–258...
et. al., Discovery of epidosites in a modern oceanic setting, the Tonga forearc, Geology, February, 2000 v. 28, no. 2, p. 151-154" (PDF). Archived from...
employed the air guns along the trench axis, and well into the backarc and forearc, from 13 to 15 March 1976. Thence they proceeded south to the Ontong Java...
multiple names: authors list (link) "Locator map". Expedition to the Mariana forearc. School of Ocean and Earth Science and Technology at the University of...
in Nusa Tenggara in the mountainous islands of Sumba and Timor, is the forearc of the South Sumatra Basin along the Sunda Trench subduction zone. At Nias...
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