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They're the same point, but reached from opposite directions. ie, partial melting is where a solid has partially melted into a liquid, while fractional crystallisation is where a liquid has only partially become a solid.

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12y ago
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12y ago

Say you have an aqueous solution of two different salts with different

solubility. If you let the water of the solution evaporate slowly, the

salts concentration will beguine to increase 'till the salt with the lower

solubility will start to crystallize. The second salt won't start to do the

same until the first salt is out of solution. This is called fractional crystallization.

Now, if you have a solidified solution of different substances, when cooled

slowly the substance with the highest melting temperature will be the

first to start melting, and the one with the lowest melting temperature

will be the last.

The two processes are the opposite of each other in direction.

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Q: How is partial melting the opposite of fractional crystallization?
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What is thought to form by partial melting and in situ crystallization of the melted portion?

migmatite


How is partial melting related to fractional crystallization?

Partial melting occurs in rocks because the different minerals that compose rocks have different melting points. For example, felsic minerals (e.g. quartz and feldspar) melt at around 700 degrees Celsius while mafic minerals (e.g. pyroxene and olivine) melt at around 1200 degrees Celsius. Therefore, felsic minerals will melt first leaving the mafic minerals solid.Fractional crystallization occurs when minerals from a magma cool and crystallize out of the magma. The first crystals to melt in partial melting will be the first minerals to crystallize out when the magma begins to cool. Therefore, mafic minerals will crystallize first, followed by felsic minerals.Both partial melting and fractional crystallisation tend to produce a more felsic magma than their source rocks.The difference is simply that they are the reverse of one another, heat it up, cool it down. Things that melt first solidify last and separate from one another.


What physical properties could be used to separate two different substances?

Boiling point is a physical property. Alcohol and water can be separated by distillation because they have different boiling points. Alcohol boils at a lower temperature water. In distillation, the vapor is collected and condensed back into a liquid. The condensed liquid will have a higher proportion of alcohol to water than the original mixture.Fractional freezing is a process used in proses engineering and chemistry to separate substances with different melting points. It can be done by partial melting of a solid, for example in zone refining of silicon or metals, or by partial crystallization of a liquid, for example "freeze distillation", also called "normal freezing" or "progressive freezing".Partial crystallization can also be achieved by adding a dilute solvent to the mixture, and cooling and concentrating the mixture by evaporating the solvent, a process called "solution crystallization".[1] Fractional freezing is generally used to produce ultra-pure solids, or to concentrate heat-sensitive liquids.


Can Small amounts of water can lower partial melting temperatures in silicate rocks?

The addition of water can lower partial melting temperatures in silicate rocks.


What is the opposite of impartial?

partial


Basalt is generated by?

partial melting of mantle rocks


What is the opposite word for partial?

The antonyms for the word partial are complete, entire, whole, or total.


Would pressure play a role in partial melting?

In so far as pressure affects the melting point of substances, the answer is yes.


What is the opposite of the word plan?

A partial opposite of "planning" (preparation) could be impulse, spontaneity, or whim. A partial opposite of "planning" used for "as the result of planning" could be fortuitousness, unexpectedness, coincidence, happenstance, or fluke.


What is the opposite of the word planning?

A partial opposite of "planning" (preparation) could be impulse, spontaneity, or whim. A partial opposite of "planning" used for "as the result of planning" could be fortuitousness, unexpectedness, coincidence, happenstance, or fluke.


Which process is the key concept behind smelting metals from ores?

Partial melting


What is responsible for the partial melting of peridotite beneth the mid-ocean ridges?

An increase in pressure.