17 Questions
What happens to the contrasts in temperature, density, and viscosity when the difference in chemical composition between two magmas is smaller?
They decrease
Which of the following is NOT an evidence for magma interaction mentioned in the text?
Crystal Formation
What can occur if a magma assimilates crustal rocks that have a different composition from the magma?
The magma's chemical composition changes
In which state is magma when processes of differentiation such as liquid immiscibility are operational?
Liquid state
What happens when a mixture of two different components in a magma becomes immiscible at a lower temperature?
They separate into droplets or bubbles
What term is used when a magma absorbs part of the rock through which it passes?
Magma contamination
What are the major mechanisms and vehicles of magmatic differentiation?
Fractional crystallization, mixing, and assimilation
Which elements are the principle components of igneous rocks according to the text?
Oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium
What is the main focus of magmatic processes?
Melting or crystallization of magma
Which process involves the modification of melt composition after melting?
Fractional crystallization
What are some secondary elements present in igneous rocks according to the text?
Titanium, hydrogen, phosphorous
Which processes are involved in magma evolution/differentiation according to the text?
Fractional crystallization, mixing, and assimilation
What process is the least common for generating magma?
Heat-induced melting
What is the first major division of magma types based on?
Alkali and silica contents
Which type of magmas are the product of large degree melting?
Tholeiitic
What will happen to the incompatible elements in the melt with further melting?
They will become less enriched
What causes distinct types of magmas based on geological settings?
Accessory, water-bearing mineral phases in the source rock
Test your knowledge on the concepts of magmas mixing and assimilation, including evidence such as mingling of magmas, disequilibrium minerals, reverse zoning in minerals, glass inclusions, and chemical evidences. Explore the effects of differences in chemical composition on temperature, density, and viscosity of magmas.
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