What does a vesicular rock indicate?
Vesicles are the small holes left behind after lava cools and turns into volcanic rock. Vesicles help geologists understand the cooling history of extrusive (volcanic rocks) because lava contains large amounts of dissolved gases that are released as the lava hardens.
What rocks are vesicular?
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.
What does a vesicular igneous texture indicates?
A vesicular igneous texture indicates that: The rock cooled quickly.
What does a vesicular texture indicate about how this rock formed?
Vesicular texture occurs when gases are trapped within a lava flow and minerals crystallize around the gas pocket. Pyroclastic texture results from explosive volcanic eruptions and the resulting rock is composed of a mixture of preexisting igneous rock, mineral grains, and ash particles.
Is vesicular texture intrusive or extrusive?
Vesicular texture — basalt scoria: This is an extrusive igneous rock that chilled very quickly, so that the bubbles (vesicles) formed by escaping gas were preserved.
Are vesicular rocks intrusive or extrusive?
extrusive igneous rocks extrusive igneous rocks Such openings are called vesicles, and the rocks in which they occur are said to be vesicular.
Do vesicular rocks cool fast or slow?
Vesicular texture — basalt scoria: This is an extrusive igneous rock that chilled very quickly, so that the bubbles (vesicles) formed by escaping gas were preserved.
Do vesicular rocks cool fast?
Vesicular texture — basalt scoria: This is an extrusive igneous rock that chilled very quickly, so that the bubbles (vesicles) formed by escaping gas were preserved.
Do vesicular rocks have crystals?
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. The texture is often found in extrusive aphanitic or glassy igneous rock.
Can extrusive igneous rocks be vesicular?
extrusive igneous rocks Such openings are called vesicles, and the rocks in which they occur are said to be vesicular.
Which texture indicates the fastest cooling?
Aphanitic texture describes fine-grained rocks. It is characteristic of extrusive (volcanic) rocks and very shallow intrusive rocks, and have crystals indistinguishable with the unaided eye. It indicates fast cooling history.
Which one of the following is a volcanic rock with vesicular texture?
The type of volcanic rock with common vesicles is called scoria.
Is vesicular extrusive or intrusive?
extrusive igneous rocks extrusive igneous rocks Such openings are called vesicles, and the rocks in which they occur are said to be vesicular.
What is a vesicular felsic rock called?
A vesicular Felix rock is called a: Pumice.