What type of volcano has both mafic and felsic lava?

Magma composition determines both eruption type and volcano type. Composite cones are built of felsic to intermediate lava and shield volcanoes of mafic lava. Cinder cones are made of small fragments of a variety of compositions usually from a single eruption.

Why volcanoes containing felsic rocks erupt violently?

Explosive Eruptions Felsic magmas erupt explosively because of hot, gas-rich magma churning within its chamber. Magma, rock, and ash burst upward in an enormous explosion creating volcanic ash called tephra.

Are explosive eruptions mafic or felsic?

The style of a volcanic eruption depends on magma viscosity. Felsic magmas produce explosive eruptions. Mafic magmas produce effusive eruptions. Explosive eruptions happen along the edges of continents and produce tremendous amounts of material ejected into the air.

What kind of eruptions does mafic magma have?

Felsic Magma The adjacent Magma Comparison table summarizes properties of the two basic magma types. Mafic magma produces high volume, slow moving, effusive eruptions. It forms within the upper mantle, much deeper than felsic magma.

Is Mt Fuji mafic or felsic?

Basaltic rocks dominate in Mt. Fuji, while other arc volcanoes are dominated by intermediate and felsic compositions, and Mt.

How can you tell if a rock is felsic or mafic?

Felsic minerals (quartz, K feldspar, etc) are light colored while mafic minerals (hornblende, pyroxenes) are normally dark colored. Felsic minerals have the lowest melting points (600 to 750 °C) and mafic minerals have higher melting points (1000 to 1200 °C).

What are three types of eruptions?

Types of eruptions

• Hydrothermal eruption. An eruption driven by the heat in a hydrothermal systems.
• Phreatic eruption. An eruption driven by the heat from magma interacting with water.
• Phreatomagmatic eruption.
• Lava.
• Strombolian and Hawaiian eruptions.
• Vulcanian eruptions.
• Subplinian and Plinian eruptions.

Is Mt. Fuji mafic?

Mt. Fuji is a composite volcano which has the characterisitcs of a composite volcano. This means that they are made up of both types of eruptions; lava flows and pyroclastic material. When the volcano has an episode of a quiet eruption, lava flows down the sides of the cone.

What’s the difference between mafic and felsic lava?

Before cooling, mafic lava has a very low viscosity. The below picture is of the mafic rock basalt. Felsic Magmas: The rocks that form from this type of magma are representative of continental rocks. They tend to have high Silicon content, also known as Silica content.

What happens to the magma during a felsic eruption?

Felsic magma is viscous and does not flow easily. Most felsic magma will stay deeper in the crust and will cool to form igneous intrusive rocks such as granite and granodiorite. If felsic magma rises into a magma chamber, it may be too viscous to move and so it gets stuck. Dissolved gases become trapped by thick magma.

Which is an example of a mafic lava eruption?

Mafic lava (silica-poor; example: basalt) has low viscosity (think ketchup), which allows gas bubbles to easily escape and results in effusive eruptions, where lava pours out of the ground.

Why are continental rocks mafic and oceanic rocks felsic?

This is why continental rocks are felsic and oceanic rocks are mafic. The below picture is of the felsic rock granite. Mafic Volcanoes: volcanoes that produce mafic lava have a very low explosivity due to the how easily the lava flows and how few volatiles (such as oxygen and silicon) are present within the lava.