What type of volcano has rhyolitic lava?

What type of volcano has rhyolitic lava?

Stratovolcanoes
Stratovolcanoes show inter-layering of lava flows and pyroclastic material, which is why they are sometimes called composite volcanoes. Pyroclastic material can make up over 50% of the volume of a stratovolcano. Lavas and pyroclastics are usually andesitic to rhyolitic in composition.

Are there rhyolitic underwater volcanoes?

The Eruption of Submarine Rhyolite Lavas and Domes in the Deep Ocean – Havre 2012, Kermadec Arc. Silicic effusive eruptions in deep submarine environments have not yet been directly observed and very few modern submarine silicic lavas and domes have been described.

What volcanoes have acidic lava?

Composite volcanoes have the following characteristics:

• Acidic lava, which is very viscous (sticky).
• Steep sides as the lava doesn’t flow very far before it solidifies.
• Alternate layers of ash and lava. For this reason, they’re also known as stratovolcanoes .
• Violent eruptions.
• Longer periods between eruptions.

What kind of volcano does andesite come from?

Andesite commonly erupts from stratovolcanoes, where they form small-volume flows that typically advance only short distances down the flanks of a volcano. The two examples shown here are short andesite flows advancing down the slope of the Lascar volcano in Chile, and the Colima volcano in Mexico.

Can lava exist underwater?

What Types of Lava Flows Are There Underwater? Lava erupting on the deep sea floor has a form most like pahoehoe flows. Three types of lava flows are common on the sea floor: pillow lava, lobate lava, and sheet lava. Pillow lava flows can be many hundreds of meters to kilometers long.

What is the temperature of volcano lava?

The temperature of lava flow is usually about 700° to 1,250° Celsius, which is 2,000° Fahrenheit. Deep inside the earth, usually at about 150 kilometers, the temperature is hot enough that some small part of the rocks begins to melt.

What type of volcano is rhyolite?

Composite or Strato Volcano – A steep-coned volcano that explosively emits gases, ash, pumice, and a small amount of stiff, silica lava (called rhyolite). This type of volcano can have eruptions accompanied by lahars — deadly mudflows. Most volcanoes on Earth are of this type.

How is rhyolite rock formed?

Rhyolite is an extrusive igneous rock formed as a deposit of volcanic ash. The ash becomes rock after being exposed to extreme heat and pressure. Iron oxide stains create the beautiful patterns. Rhyolite is porous and often does not take a polish.

What is the formation of rhyolite?

The formation of rhyolite usually takes place in continental or continent-margin volcanic eruptions where the granitic magma reaches the surface. It rarely is produced during oceanic eruptions. Due to the spontaneous release of large amounts of trapped gases, the eruptions of rhyolite may be highly explosive.

Is rhyolite a rock?

Rhyolite is a fine-grained igneous extrusive rock of high silica content or felsic rock. Rhyolite is composed principally of quartz and feldspar minerals, and traces of biotite, plagioclase , mica, amphibiotes, and pyroxenes . It resembles granite in mineral composition, although granite is an intrusive igneous rock.