How does a vesicular texture in a volcanic rock develop Quora?

How does a vesicular texture in a volcanic rock develop Quora?

As the lava nears the surface, the pressure decreases and dissolved gases form bubbles in the lava, which are preserved as the rock solidifies. In extremely gaseous lava, the rock becomes pumice (which is so full of vesicles that it is less dense than water and can float).

What causes vesicular rocks?

Basalts are most commonly vesicular. The drop in pressure that a magma experiences as it flows from underground to the Earth’s surface allows water and gases in the lava to form bubbles. If the bubbles do not get large enough to pop, they are frozen in the lava as vesicles.

Where are vesicular rocks formed?

volcanic rocks
Vesicles are commonly found in volcanic rocks– that is, in rocks that solidified from lava. As you might remember from M is for Magma, lava is what you call molten rock when it is extruded onto Earth’s surface. Molten rock– magma and lava– often contains dissolved gases such as water and carbon dioxide.

How does volcanic rock develop?

Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. When lava comes out of a volcano and solidifies into extrusive igneous rock, also called volcanic, the rock cools very quickly.

How do rocks with glassy texture form?

Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. The result is a natural amorphous glass with few or no crystals. The minerals in a phaneritic igneous rock are sufficiently large to see each individual crystal with the naked eye.

Why are volcanic rocks porous?

Porosity in volcanic rocks is mainly defined by the abundance of vesicles. The porosity of a pyroclastic rock generally imparts a primary permeability; if subjected to hydrothermal fluid circulation, this permeability may change as a result of the dissolution of glass and the growth of secondary minerals.

Which one of the following is a volcanic rock with vesicular texture?

Volcanic rocks often have a vesicular texture, which is the result voids left by volatiles escaping from the molten lava. Pumice is a rock, which is an example of explosive volcanic eruption. It is so vesicular that it floats in water.

What is a vesicular felsic rock called?

Porphyritic. A vesicular Felix rock is called a: Pumice.

What type of rocks are vesicular?

Vesicles only develop in rocks that cool from a liquid – an igneous rock. Most meteorites come from asteroids, and almost all asteroids are too small to have volcanoes, thus few meteorites are igneous rocks. Most such rocks among the meteorites are basalts.

How is the vesicular texture of a rock formed?

Vesicular texture. When this happens gasses dissolved in the magma are able to come out of solution, forming gas bubbles (the cavities) inside it. When the magma finally reaches the surface as lava and cools, the rock solidifies around the gas bubbles and traps them inside, preserving them as holes filled with gas called vesicles.

Which is an example of a volcanic texture?

Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. The result is a natural amorphous glass with few or no crystals. Examples include obsidian and pumice. Vesicular texture is a volcanic rock texture characterised by, or containing, many vesicles.

What kind of texture is found in igneous rocks?

VESICULAR TEXTURE. Vesicular texture is a volcanic rock texture characterised by, or containing, many vesicles. The texture is often found in extrusive aphanitic, or glassy, igneous rock. The vesicles are small cavities formed by the expansion of bubbles of gas or steam during the solidification of the rock.

How does porphyritic texture occur in a volcano?

The result is an aphanitic rock with some larger crystals (phenocrysts) imbedded within its matrix. Porphyritic texture also occurs when magma crystallizes below a volcano but is erupted before completing crystallization thus forcing the remaining lava to crystallize more rapidly with much smaller crystals.