Andesite magma is Formed by partial wet melting of the mantle. The mantle beneath the ocean is in contact with water. … the result is a basalt magma with a high water content. If this basaltic magma fuses with continental crust containing high concentrations of silica, andesite magma forms.

Where does andesite magma form?

Granitic or rhyolite magmas and andesite magmas are produced in Convergent plate boundaries of the marine lithosphere (Earth’s outer layer consisting of the crust and upper mantle) subduction so that its edge lies below the edge of a continental plate or another oceanic plate.

Is andesite magma intermediate?

Andesite magma – SiO2 55-65 wt%, Middle. In iron, magnesium, calcium, sodium, potassium.

Is andesite magma thick?

Andesite Lava

These viscous lava have a relatively high aspect ratio (thickness/area), Generally > 1/100some thick enough to form lava domes.

What are the characteristics of andesite magma?

Andesite magma has Moderate The temperature range for these minerals is approximately 800oC to 1000oC (1472oF to 1832oF). Rhyolite magma is high in potassium and sodium but low in iron, magnesium and calcium. It occurs in a temperature range of approximately 650oC to 800oC (1202oF to 1472oF).

Origin of magma

45 related questions found

Is andesite magma explosive?

Andesite magma is usually ejected from stratovolcanoes in thick lava flows, some kilometers long.Andesite magma can also generate powerful explosive eruption Pyroclastic flows and surges and giant eruption columns form. Andesite erupts at temperatures between 900 and 1100°C.

Why is rhyolite magma explosive?

High gas content and high viscosity magmas (andesite to rhyolite) favor explosive eruptions.explosive eruption The bubbles break the magma into liquid clots that cool as they fall from the air.

What makes magma rise to the surface?

Lava can rise Pieces of Earth’s crust called tectonic plates slowly move away from each other…when these tectonic plates move against each other, the magma also rises. When this happens, parts of the Earth’s crust may be forced deep into its interior. Heat and pressure cause the crust to melt and rise like magma.

What is the difference between basaltic andesite and rhyolite magma?

High temperature and low SiO2 content lead to fluid magma (basalt).Lower temperature and higher SiO2 content lead to sticky magma (andesite and rhyolite magmas). … explosive eruptions are characteristic of viscous andesite and rhyolite magmas with high gas content.

What is the most active volcano in the world?

Gradually ascend above 4 km (2.5 mi) above sea level, Mauna Loa, Hawaii It is the largest active volcano on our planet.

Is andesite an intermediate?

Andesite is a The composition of extrusive rocks is between rhyolite and basalt. Andesite lava is moderately viscous and forms thick lava flows and domes. The word andesite comes from the Andes Mountains in South America, where andesite is very common.

What is the difference between magma and lava?

scientists use the word magma Lava used underground and lava used to break through the earth’s surface.

Which magma type flows the fastest?

Pahoho – Has a glossy, smooth, glass-like surface. It tends to be more fluid (lower viscosity), so it flows faster and produces thinner flows (usually 1-3 m).

How is rhyolite magma formed?

Rhyolite magma formed as The result of wet melting of continental crust. Rhyolite is a rock that contains water and minerals that contain water, such as biotite. …This crystallization releases the heat of the basalt magma, causing the continental crust to heat up and melt.

What are the three most common minerals in andesite?

andesite rich plagioclase and amphibole minerals. Quartz and pyroxene minerals may be absent or present in small amounts.

Which component in magma has the highest and lowest value?

felsic magma It has the highest silica content of all magma types, between 65-70%. Therefore, felsic magmas also have the highest gas content and viscosity, and the lowest average temperature, between 650o and 800o Celsius (1202o and 1472o Fahrenheit).

Why is rhyolite magma the highest viscosity?

This initially smooth lava flow is called a pahoehoe flow. … siliceous lava flows – high viscosity andesite and rhyolite lava flows because They do not flow easily, form a coarse flow and do not run away from the vents.

How deep is the magma on Earth?

A layer of lava that has been trapped since Earth formed may exist where the solid mantle meets the core, a new study suggests.A layer of scorching liquid magma trapped since Earth formed may be located in 1,800 miles (2,900 km) under our feetnew research shows.

What is the thinnest layer of the earth?

*kernel

It is the thinnest layer on earth. *The crust is 5-35 km thick below land and 1-8 km below ocean.

What is the most abundant element in magma?

Magma varies in composition, but will have eight major elements in varying proportions.The most abundant element is Oxygen and Silicon, followed by aluminum, iron, calcium, sodium, magnesium and potassium. These eight elements are also the most abundant in the Earth’s crust (Figure 7.2).

What kind of material might erupt next?

A combination of lava or ash, cinder and bomb Eruptions are likely next, as alternating layers of lava and ash, cinders and bombs create compound volcanoes.

Which magma erupts most violently?

• Andesite magma erupts explosively because.
• It tends to have a high gas content. This is.
• Viscous, and therefore traps gas, forms.
• Stress and explosive bursts. High.
• Viscosity is related to high silica content.

Why is rhyolite ash common but rhyolite lava not?

Due to their high silica content and low iron and magnesium content, rhyolite magma forms Highly viscous lavaAs a result, many eruptions of rhyolite are highly explosive, and rhyolite occurs more frequently in the form of pyroclastic rocks than in the form of lava flows.

How does viscosity affect the motion of magma?

high viscosity lava slow flow, usually covering a small area… In contrast, low-viscosity magma flows faster, forming lava flows that cover thousands of square kilometers.