What type of volcano has granitic magma?

Magmas that are more granitic tend to be very explosive because of their relatively higher water content. Water at high temperatures and pressures is extremely volatile. Examples of composite volcanoes include Italy’s Vesuvius, Japan’s Mount Fuji, and Washington State’s Mount Rainier and Mount St.

Is granitic magma volatile?

Water and granite magmas Water is the most abundant volatile component in silicate rocks and it is highly soluble in granitic melts. For example, at 700 MPa (7 kbar) a granitic melt may dissolve up to 14 wt.

What is granitic magma composed of?

Granite (/ˈɡræn. ɪt/) is a coarse-grained igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground.

How is granitic magma formed?

Laboratory experiments suggest that when rocks with the composition of continental crust start to melt at temperature and pressure conditions found in the lower crust, a granitic liquid is formed, with 30 percent partial melting. …

What type of volcano is least likely to erupt?

Shield Volcanoes are least likely because they form when layers of lava flow out from the vent, harden, and slowly build up to form. What type of volcano is composed mostly of pyroclastic material? Volcanic islands can sometimes form over hot spots. What land feature should be under a hot spot?

Why is rhyolitic magma explosive?

Explosive eruptions are favored by high gas content and high viscosity (andesitic to rhyolitic magmas). Explosive bursting of bubbles will fragment the magma into clots of liquid that will cool as they fall through the air.

Is granitic magma wet or dry?

Why does granitic composition magma rarely make it to the surface? (Granitic magma is a wet melt and the melting temp increases with decreasing pressure so that is solidifies as is rises to the surface, aas pressure decreases. Opposite is true for dry basaltic magma (it further melts as it rises to the surface).

What are the 4 types of magma?

Because many of the properties of a magma (such as its viscosity and temperature) are observed to correlate with silica content, silicate magmas are divided into four chemical types based on silica content: felsic, intermediate, mafic, and ultramafic.

Which type of magma is the thinnest?

Pahoehoe. Pronounced “pa-ho-ho,” this is a type of lava that is much thinner and a lot less gooey than the a’a type of lava. It often flows down the slopes of volcanoes located in very large rivers.

What kind of rock is produced from a granitic eruption?

Eruptions of Granitic Magma. Eruptions of granitic magma can produce rhyolite, pumice, obsidian, or tuff. These rocks have similar compositions but different cooling conditions. Explosive eruptions produce tuff or pumice. Effusive eruptions produce rhyolite or obsidian if the lava cools rapidly.

What’s the difference between granitic magma and basaltic magma?

Granitic magma has high levels of potassium and sodium, while basaltic magma has very low levels of these minerals. When magmas are judged by mineral composition like this, they are technically referred to as felsic, which is granitic, and mafic, which is basaltic. Another major…

Where do granitic and andesitic magmas come from?

In igneous rock: Origin of magmas Granitic, or rhyolitic, magmas and andesitic magmas are generated at convergent plate boundaries where the oceanic lithosphere (the outer layer of the Earth composed of the crust and upper mantle) is subducted so that its edge is positioned below the edge of the continental plate….

What makes grantic lava different from basaltic lava?

Grantic magma is rich in silica with abundant sodium and potassium. It has an extremely high viscosity and cools to form light-colored rocks. Basaltic magma is low in silica with abundant iron and magnesium.