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Magmas Mixing and Assimilation Quiz

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Questions and Answers

What happens to the contrasts in temperature, density, and viscosity when the difference in chemical composition between two magmas is smaller?

They remain the same

They decrease (correct)

They increase

They become unpredictable

Which of the following is NOT an evidence for magma interaction mentioned in the text?

Crystal Formation (correct)

Reverse Zoning in Minerals

Glass inclusions

Disequilibrium Mineral quartz or olivine

What can occur if a magma assimilates crustal rocks that have a different composition from the magma?

The magma's chemical composition changes (correct)

The magma becomes more homogeneous

The magma becomes less viscous

The magma's chemical composition remains unchanged

In which state is magma when processes of differentiation such as liquid immiscibility are operational?

Liquid state Signup and view all the answers

What happens when a mixture of two different components in a magma becomes immiscible at a lower temperature?

They separate into droplets or bubbles Signup and view all the answers

What term is used when a magma absorbs part of the rock through which it passes?

Magma contamination Signup and view all the answers

What are the major mechanisms and vehicles of magmatic differentiation?

Fractional crystallization, mixing, and assimilation Signup and view all the answers

Which elements are the principle components of igneous rocks according to the text?

Oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium Signup and view all the answers

What is the main focus of magmatic processes?

Melting or crystallization of magma Signup and view all the answers

Which process involves the modification of melt composition after melting?

Fractional crystallization Signup and view all the answers

What are some secondary elements present in igneous rocks according to the text?

Titanium, hydrogen, phosphorous Signup and view all the answers

Which processes are involved in magma evolution/differentiation according to the text?

Fractional crystallization, mixing, and assimilation Signup and view all the answers

What process is the least common for generating magma?

Heat-induced melting Signup and view all the answers

What is the first major division of magma types based on?

Alkali and silica contents Signup and view all the answers

Which type of magmas are the product of large degree melting?

Tholeiitic Signup and view all the answers

What will happen to the incompatible elements in the melt with further melting?

They will become less enriched Signup and view all the answers

What causes distinct types of magmas based on geological settings?

Accessory, water-bearing mineral phases in the source rock Signup and view all the answers