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Felsic magma tends to have large amounts of gas, chiefly water vapor, carbon dioxide, and sulfur dioxide, trapped in it under pressure. When it gets near the surface the pressure drops. The gas is released and expands rapidly, creating an explosion. The effect is similar to opening a freshly shaken can of soda, only much more violent.
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoThere are two ways this can happen. One mechanism is fractional crystallization. As a mass of mafic magma cools the more mafic minerals tend to solidify first. The remaining liquid becomes more felsic as a result. Anothr mechanism is the incorporation of country rock. The heat of the magma melts the surrounding rock. More felsic minerals tend to melt first. Additionally, if the magma is intruding into continental crust, the native rock will likely be felsic to begin with. In most cases this transition occurs due to a combination of these preocesses.
Wiki User
∙ 7y agoFelsic magma tends to have a high gas content. The gases in magma are what create explosive eruptions.
Wiki User
∙ 12y agodissolved water causes steam explosions.
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A volcano with a magma supply which is felsic and has a high viscosity will tend to have what type of eruption?
A volcano fed by felsic magma will tend to have explosive eruptions.
What type of magma will produce explosive eruptions?
Felsic magmas that are high in silica content and are highly viscous produce explosive eruptions.
Is felsic magma viscous?
Yes. Felsic magma is very viscous.
Does Krakatoa have felsic magma or mafic?
felsic
If basalt is in lava is the volcano explosive?
No. The more basalt the quieter the eruption. Basalt is deep deep material, from down where there are few volatiles to make lava explosive.
A volcano with a magma supply which is felsic and has a high viscosity will tend to have what type of eruption?
A volcano fed by felsic magma will tend to have explosive eruptions.
What type of magma will produce explosive eruptions?
Felsic magmas that are high in silica content and are highly viscous produce explosive eruptions.
What do quiet lava eruptions generally result from?
Volcanic eruptions are always caused by magma. This applies if the eruption is quiet or explosive, or whether the magma is felsic or mafic.
Is felsic magma viscous?
Yes. Felsic magma is very viscous.
What does magma with high silica content form?
When it cools and crystallizes into rock, the rock will be described as felsic igneous rock. Examples of felsic igneous rocks are granite, rhyolite, and pumice.
Is felsic magma eruptive?
Not usually. Because it is so viscous, felsic magma does not erupt as easily as mafic magma. While eruptions of felsic magma do occur, most felsic rocks are intrusive, meaning they solidify underground.
Does Krakatoa have felsic magma or mafic?
felsic
If basalt is in lava is the volcano explosive?
No. The more basalt the quieter the eruption. Basalt is deep deep material, from down where there are few volatiles to make lava explosive.
Is mafic magma explosive?
Not usually. Mafic magma usually has a low gas content than felsic or intermediate magma, so eruptions are often effusive. Cinder cones primarily erupt mafic lava with a low level of explosivity. Explosive eruptions can also occur if the magma comes in contact with groundwater.
What happen when felsic magma mix with basic magma?
Felsic and mafic (basic) magam mix to form intermediate magma.
Where do mafic and felsic magma originate?
Felsic is a term that means that a rock contains types of silica. Fesic magma is magma that is high in silica particles and low in iron particles.
How the composition of magma determines an eruption's characteristics?
Silica(te) rich magma is usually an explosive eruption. The explosiveness of an eruption depends on - a) Gases trapped within the magma at eruption b) The Silica content c) The fragility of the crater walls and/or the volcanic plug.
