where does an accretionary wedge form?

Major rifts occur along the central axis of most mid-ocean ridges, where new oceanic crust and lithosphere is created along a divergent boundary between two tectonic plates.

What is the difference between Terrane and terrain?

What is the difference between terrane and terrain? “Terrane” describes a crustal fragment consisting of a distinct and recognizable series of rock formations that has been transported by plate tectonic processes, whereas “terrain” describes the shape of the surface topography.

What is a mélange in geology?

Mélange (spelled melange in much English-language literature) describes heterogeneous rock units that contain blocks, typically of hard or structurally competent lithologies, surrounded and supported by a fine-grained matrix of shale, slate, or serpentinite.

What is a batholith and in what modern tectonic setting are Batholiths being generated?

In what modern tectonic setting are batholiths being generated? Batholith: magma that intrudes the crust and never reaches the surface. Instead, it crystallizes at depth to form more massive igneous plutons. Modern batholiths are being created in Granite in the Sierra Nevada.

How are the positions of the islands explained by plate tectonic theory quizlet?

How are the positions of the islands explained by plate tectonic theory? A hot spot is currently situated under Hawaii and the Pacific Plate is moving across it in a northwesterly direction. … an oceanic plate is subducting under the western edge of the South American Plate.

What type of convergence produces volcanic island arcs?

When two oceanic plates collide against each other, the older and therefore heavier of the two subducts beneath the other, initiating volcanic activity in a manner similar to that which occurs at an oceanic-continental convergent plate boundary and forming a volcanic island arc.

Where are accretionary wedges formed quizlet?

An accretionary wedge forms at an active continental margin when the subducting oceanic slab scrapes pieces of itself onto the more buoyant continental slab.

What is an accretionary prism quizlet?

An accretionary prism is a wedge-shaped mass of sediment scraped off a subducting plate as it slides under the overriding plate. A spreading boundary must be in the middle of the ocean basin where it is located. … Plates may consist of all ocean floor or both ocean floor and continental crust.

Underplating of oceanic lithosphere into an accretionary wedge

convergent plate boundary with accretion wedge

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