What Kind Of Eruptions Is From Granitic Lava

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.

What kind of eruptions is from granitic lava.

Since 1900 only three are known to have occurred. Granitic magma is highly viscous meaning it has a high resistance to flow. Eruptions can be effusive where lava flows like a thick sticky. The icelandic type is characterized by effusions of molten basaltic lava that flow from long parallel fissures such outpourings often build lava plateaus.

The composition of magma affects the of lava. Andrew strait volcano in papua new guinea novarupta volcano in alaska and chaiten. Pillow pahoehoe and a a. Hawaiian these are eruptions of low viscosity basaltic magma.

The hawaiian type is similar to the icelandic variety. 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. Eruptions of granitic magma are rare. The lava still molten when it returns to the.

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. In this case however fluid lava flows from a volcano s summit and radial fissures to form shield volcanoes which are quite large and have gentle slopes. The type of eruption and the type of volcano. There are three types of basalt lava flows.

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. Other articles where granitic magma is discussed. These were at st. Gas discharge produces a fire fountain that shoots incandescent lava up to 1 km above the vent.

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. Effusive eruptions produce rhyolite or obsidian if the lava cools rapidly. An important point to remember however is that during a given eruption the type of eruption may change between several different types.