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Magma | National Geographic Society

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Which two processes commonly generate magma? decompression melting and wet melting (the addition of volatiles) Where does the water involved in melting at subduction zones come from? Water contained within minerals in the subducting plate is released during metamorphism.Which two processes commonly generate magma? Water contained within minerals in the subducting plate is released during metamorphism. Where does the water involved in melting at subduction zones come from? the rock that makes up the mantle. What is peridotite?The two processes resulting from sedimentary into metamorphic rock are known as contact metamorphism and regional metamorphism. Regional metamorphism most notably involves two tectonic plates...Either of these process would produce a change in the chemical composition of the magma unless the material being added has the same chemical composition as the magma. In a sense, bulk assimilation would produce some of the same effects as mixing, but it is more complicated than mixing because of the heat balance involved.Xenoliths are also common in the processes of magma mixing and rejuvenation, two other processes that can contribute to magmatic differentiation. Magma mixing occurs when two different magmas come into contact and mix, though at times, the magmas can remain heterogeneous and create xenoliths, dikes, and other features.

Geology Test 2 Flashcards | Quizlet

3.2 Magma and Magma Formation Magmas can vary widely in composition, but in general they are made up of only eight elements; in order of importance: oxygen, silicon, aluminum, iron, calcium, sodium, magnesium, and potassium (Figure 3.6).Which two processes commonly generate magma? decompression melting and wet melting (the addition of volatiles) Where does the water involved in melting at subduction zones come from? Water contained within minerals in the subducting plate is released during metamorphism.Magmatic Differentiation But, processes that operate during transportation toward the surface or during storage in the crust can alter the chemical composition of the magma. These processes are referred to as magmatic differentiation and include assimilation, mixing, and fractional crystallization.4.1 Plate Tectonics and Volcanism The relationships between plate tectonics and volcanism are shown on Figure 4.3. As summarized in Chapter 3, magma is formed at three main plate-tectonic settings: divergent boundaries (decompression melting), convergent boundaries (flux melting), and mantle plumes (decompression melting).

Which two processes commonly generate magma? - Answers

The three ways that magma can be formed are through heat transfer, decompression melting and flux melting. The process of magma creation is referred to by geologists as magmagenesis and occurs at the upper mantle of the Earth's crust due to plate tectonic effects.A number of processes that take place within a magma chamber can affect the types of rocks produced in the end. If the magma has a low viscosity (i.e., it's runny) — which is likely if it is mafic — the crystals that form early, such as olivine (Figure 3.14a), may slowly settle toward the bottom of the magma chamber (Figure 3.14b).The rock cycle is driven by Earth's internal heat, and by processes happening at the surface, which are driven by solar energy. 3.2 Magma and Magma Formation: Magma is molten rock, and in most cases, it forms from partial melting of existing rock. The two main processes of magma formation are decompression melting and flux melting.These geologic features commonly produce igneous rocks. , Another word for molten rock inside the earth. , Igneous rocks can be classified as these two types. , The rock texture when an igneous rock cools slowly.Volcanic rocks from deep-seated sources of the crust-mantle transition (CMT) are geochemically distinguished from those of ocean island basalts (OIB). Here, we report geochemical data on tectonic pseudotachylytes from the Main Sayan Fault (MSF) and volcanic rocks from the Kamar-Stanovoy Zone of Hot Transtension (KSZHT) that represent the deep-seated CMT magmatic sources in the central part of