What igneous rocks have a vesicular texture?
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What igneous rocks have a vesicular texture?
The vesicles are small cavities formed by the expansion of bubbles of gas or steam during the solidification of the rock. Rock types that display a vesicular texture include pumice and scoria.
What causes the holes and bubbles to form in vesicular igneous rocks?
As the magma rises to the surface, the drop in pressure causes the dissolved volatiles to come bubbling out of solution, like the fizz in an opened bottle of soda. The gas bubbles become trapped in the solidifying lava to create a vesicular texture, with the holes specifically called vesicles.
How are vesicular basalts formed?
Vesicular basalt is formed when magma erupts from a volcano in the form of lava and it quickly hardens. This makes it an extrusive igneous rock….
What effect does vesicular texture have on a rocks density?
Pumice is an extrusive igneous rock, forming as a result of the fast cooling of light-colored magmas. Its vesicular texture is a result of the depressurization of gases within its parent magma and gives it an extremely light density.
How does vesicular texture develop?
A vesicular texture is caused when dissolved gases and other volatile components of a magma erupt from the liquid portion due to a decrease in pressure. This causes the magma to foam up, and the resulting rock to be riddled with hole-like structures called vesicles.
Why do some igneous have coarse texture and others have fine texture?
Extrusive or volcanic rocks crystallize from lava at the earth’s surface. The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals.
How does a vesicular texture develop?
What does the texture of an igneous rock depend on?
The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals.
Which igneous rock has a vesicular texture and felsic composition?
Pumice
Classification of Igneous Rocks
| COMPOSITION | ||
| TEXTURE | Felsic | Ultramafic |
|---|---|---|
| Phaneritic | Granite | Peridotite |
| Aphanitic | Rhyolite | |
| Vesicular | Pumice |