In what plate tectonic setting do most Stratovolcanoes occur?

Where do stratovolcanoes occur? They occur at the subduction zones and are caused by convergent boundaries. At a subduction zone, a plate with oceanic crust dives beneath the other plate and into the mantle, where it is reabsorbed.

What type of plate boundary creates a volcanic island chain?

convergent plate boundary
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.

What occurs when there are tectonic and volcanic activities in the Earth’s crust?

If you recall, magma is molten rock that has been heated because of high temperatures and pressures beneath the Earth’s crust. This pressure mostly occurs where the tectonic plates meet and subduct. So, volcanic activity tends to occur along subduction plate boundaries, where one plate slides underneath another.

Which plate tectonic setting will you find the greatest magma production?

Mid Ocean Ridge Basalts (MORBs) The Oceanic Ridges are probably the largest producers of magma on Earth. Yet, much of this magmatism goes unnoticed because, with the exception of Iceland, it all takes place below the oceans. This magmatism is responsible for producing oceanic crust at divergent plate boundaries.

How are most stratovolcanoes formed?

Stratovolcanoes typically form at convergent plate margins, where one plate descends beneath an adjacent plate along a subduction zone.

What is the plate tectonic setting of the Mount Tambora volcano?

Mount Tambora formed at a convergent plate boundary, where the Indo-Australian Plate subducts under the Eurasian Plate. Tambora is a stratovalcano, with an elevation of 2,850m (9,350ft).

At which tectonic setting would you most likely find volcanoes?

The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries. At a divergent boundary, tectonic plates move apart from one another.

What tectonic settings where magma is formed?

As summarized in Chapter 3, magma is formed at three main plate-tectonic settings: divergent boundaries (decompression melting), convergent boundaries (flux melting), and mantle plumes (decompression melting).

What magma creates stratovolcanoes?

andesite
The lava flowing from stratovolcanoes typically cools and hardens before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma.

Which type of magma will produce the most explosive volcanic eruption?

Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas). The explosive bursting of bubbles fragments the magma into clots of liquid that cool as they fall through the air. These solid particles become pyroclasts or volcanic ash.

How plate-tectonic processes relate to the formation of magma?

As the two plates separate, the mantle rock from the asthenosphere layer below flows up into the void between the plates. Because the pressure is not as great at this level, the mantle rock will melt, forming magma. As the magma flows out, it cools, hardening to form new crust.

What happens when magma flows out of plate tectonic plates?

As the magma flows out, it cools, hardening to form new crust. This fills in the gap created by the plates diverging. This sort of magma production is called spreading center volcanism.

What is plate tectonics in geography?

Vocabulary. Plate tectonics is a scientific theory that explains how major landforms are created as a result of Earth’s subterranean movements. The theory, which solidified in the 1960s, transformed the earth sciences by explaining many phenomena, including mountain building events, volcanoes, and earthquakes.

What causes a subduction zone to produce magma?

The increased water content lowers the melting point of the mantle rock in this wedge, causing it to melt into magma. This sort of magma production is called subduction zone volcanism.

What happens to the mantle when the plates diverge?

Because the pressure is not as great at this level, the mantle rock will melt, forming magma. As the magma flows out, it cools, hardening to form new crust. This fills in the gap created by the plates diverging. This sort of magma production is called spreading center volcanism.