What Kind Of Eruptions Is From Granitic Lava

The type of eruption and the type of volcano.

What kind of eruptions is from granitic lava. A vulcanian eruption is a short violent relatively small explosion of viscous magma usually andesite dacite or rhyolite this type of eruption results from the fragmentation and explosion of a plug of lava in a volcanic conduit or from the rupture of a lava dome viscous lava that piles up over a vent. Eruptions of granitic magma are rare. Felsic composition erupts at 600 800 degrees celsius more viscous highest silica plugs volcanoes gases build up produces most explosive eruptions lava flows are blocky e g. First of all you should know the difference between lava and magma magma and lava are both molten liquid rock but magma is moltenrock produced underneath earth surface while it magma erupts on the surface of earth it is called lava.

Pillow lavas are volumetrically the most abundant type because they are erupted at mid ocean ridges and because they make up the submarine portion of seamounts and large intraplate volcanoes like the hawaii emperor seamount chain. Effusive eruptions produce rhyolite or obsidian if the lava cools rapidly. Since 1900 only three are known to have occurred. Andrew strait volcano in papua new guinea novarupta volcano in alaska and chaiten.

The icelandic type is characterized by effusions of molten basaltic lava that flow from long parallel fissures such outpourings often build lava plateaus. Eruptions can be effusive where lava flows like a thick sticky. Granitic or rhyolitic magmas and andesitic magmas are generated at convergent plate boundaries where the oceanic lithosphere the outer layer of earth composed of the crust and upper mantle is subducted so that its edge is positioned below the edge of the continental plate or. An important point to remember however is that during a given eruption the type of eruption may change between several different types.

Granitic magma is highly viscous meaning it has a high resistance to flow. These were at st. Hawaiian these are eruptions of low viscosity basaltic magma. The hawaiian type is similar to the icelandic variety.

The lava still molten when it returns to the. What type of magma is. Different compositions of magma can affect the of a volcano. The composition of magma affects the of lava.

These different rock types can all be found in the products of a single eruption. Gas discharge produces a fire fountain that shoots incandescent lava up to 1 km above the vent. Other articles where granitic magma is discussed.