what type of lava comes from mt pinatubo?

Question

i need this for a science project. help!

Answer 1

Since Mt. Pinatubo is a stratovolcano..It's built up by many layers of hardened lava, tephra, pumice, & volcanic ash. The lava that flows from stratovolcanoes cools and hardens before spreading far due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma.



And lava flows from stratovolcanoes are generally not a significant threat to people because the highly viscous lava moves slowly enough for people to move out of the path of flow. The lava flows are more of a property threat. (but not all lava flows are viscous)



But Subduction-zone stratovolcanoes like Mt. Pinatubo, erupts with explosive force..

--> Mt. Pinatubo has a lava with a mixture or both basalt and andesitic..Highly viscous and explosive kind of lava. With alternating layers of cinder and ash.

Answer 2

In pre-historic geologic time, it erupted andestie (intermediate magma chemistry). In historic times, it has been erupting dacite, which is an intermediary between andesite and rhyolite (low-silica felsic chemistry).



Basalt is very low on the ladder as far as type of chemistry erupted. You want andesite and dacite.

Answer 3

It's a composite volcano and has two types of lava - basaltic and andesitic. Basalt is very low in free silica; if coarse-grained it would be gabbro. Andesite has more free silica, if coarse-grained it would be granodiorite.

Answer 4

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