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High-silicate magma, also known as "felsic magma", is molten rock below the Earth's surface (or that of any other planet, I suppose) that is made up 70% or more silica (silicon dioxide).
Compared with other compositions of magma (andesitic, mafic, ultramafic) felsic is often cooler and more viscous, and so is associated with violent and explosive volcanism. Rocks formed from felsic magma include granite and rhyolite, their porphyritic relatives, granite pegmatite, rhyoltic tuff, pumice, and obsidian.
What else can I help you with?
Magma that contains SiO2?
All magma contains SiO2. What affects magma is the amount of SiO2 in it. Magma is classified into four basic groups that can be determined by how much silica it contains by weight. Felsic: >63% SiO2 Untermediate: 52-63% SiO2 Mafic: 45-52%SiO2 Ultramafic: <45% SiO2 This spectrum is a basic guide to silicate magmas, which encompass that vast majority of magma. One exception is rare carbonatite magma, which is carbonate rather than silicate based, and even that contains some SiO2.
What are the main ingredients of magma?
Magma is composed of molten silicate minerals, dissolved gasses, and sometimes crystallized minerals.
What is a low-silica magma?
A magma containing not much silica (= SiO2). For example: a basaltic magma. These magma's have a low viscosity since the lower the SiO2-content, the lower the viscosity; and hence flow easily (↔ a felsic magma).
Which of the following causes a magma to be less viscous?
An increase in temperature, a decrease in silica content, and an increase in gas content can all cause magma to be less viscous. Lower viscosity magma flows more easily and erupts with less explosive force.
What type of magma do high explosive volcanoes have?
Viscous, gaseous magma, usually of high acidity as compared to basalt.
What determines the strength of a eruption?
The temperature, the pressure, and the type of magma. High silicate magmas generally erupt explosively.
Is felcite a metamorphic rock?
There is no individual rock called felcite. Felsic and felsitic are adjectives used to describe an igneous rock or magma that is particularly high in silicate minerals.
Magma that contains SiO2?
All magma contains SiO2. What affects magma is the amount of SiO2 in it. Magma is classified into four basic groups that can be determined by how much silica it contains by weight. Felsic: >63% SiO2 Untermediate: 52-63% SiO2 Mafic: 45-52%SiO2 Ultramafic: <45% SiO2 This spectrum is a basic guide to silicate magmas, which encompass that vast majority of magma. One exception is rare carbonatite magma, which is carbonate rather than silicate based, and even that contains some SiO2.
What is different silicate minerals produceed from solidifying magma is directly related to?
The temperature, pressure, and chemical composition of the magma are the main factors that determine the specific silicate minerals that form during solidification. Silicate minerals can vary in their chemical composition and crystal structure based on these conditions, leading to the formation of different minerals such as quartz, feldspar, mica, and pyroxene.
What are the main ingredients of magma?
Magma is composed of molten silicate minerals, dissolved gasses, and sometimes crystallized minerals.
What is a low-silica magma?
A magma containing not much silica (= SiO2). For example: a basaltic magma. These magma's have a low viscosity since the lower the SiO2-content, the lower the viscosity; and hence flow easily (↔ a felsic magma).
Is it true For molten rock to be considered a magma it must be intrusive and silicate in composition?
No. Magma is simply the name for molten rock that has not yet been erupted; after eruption it is known as lava.
How do most silicate materials form?
Most silicate materials form through the cooling and solidification of molten rock, such as magma or lava. These materials can crystallize and combine to create a variety of silicate minerals, which are the most abundant minerals in Earth's crust. Volcanic eruptions and processes like weathering and erosion also play a role in the formation of silicate materials.
What is Yellowstone magma made of?
Yellowstone magma is primarily composed of silicate minerals, predominantly andesitic to rhyolitic in composition. It contains high levels of silica, which contributes to its viscous nature. Additionally, the magma contains various gases, such as water vapor, carbon dioxide, and sulfur dioxide, which can significantly influence volcanic activity and eruptions. The unique composition of Yellowstone's magma is influenced by the underlying hot spot and the melting of the Earth's crust.
How do silicate minerals form?
Silicate minerals form through the cooling and solidification of magma or lava, in a process called crystallization. As the molten rock cools, elements and compounds within the magma combine to form various silicate minerals based on their chemical composition and crystal structure. The process can occur both deep within the Earth's crust and on the surface during volcanic activity.
Which of the following causes a magma to be less viscous?
An increase in temperature, a decrease in silica content, and an increase in gas content can all cause magma to be less viscous. Lower viscosity magma flows more easily and erupts with less explosive force.
What mineral determines magma viscosity?
A magma's viscosity is directly related to its degree of silica content.
