12 Questions
What is the process of partial melting of the source rock called?
Anatexis
What are the characteristics of Incomplete Equilibrium Melting?
Large crystal sizes and high magma viscosity
What does Equilibrium Melting involve?
Enrichment of low-T minerals in the melt
What does the Lever Rule calculate in a system?
Proportions of melt (liquid) and crystals (solid)
In Gibb’s phase rule, what does 'P' represent?
Number of phases in a system
What happens to the enriched low-T minerals as the degree of partial melting increases in Equilibrium Melting?
They become progressively less enriched in the melt
What is the main composition of magma according to the text?
Mostly silicate
What type of equilibria allows both pressure and temperature to change independently without altering the state of the system?
Divariant Equilibria
What is the primary cause of basaltic magma generation at ocean spreading ridges and continental rifts?
Decreasing pressure
What effect does high volatile content under pressure have on melting temperature of rocks?
Lowers the melting temperature
At what depth is the lithostatic stress reduced, leading to a decrease in rock melting temperature?
At 10 km depth
What does partial melting remove from the source rock and concentrate into the new magma?
Potassium and sodium
Test your knowledge on the factors influencing magma formation such as temperature, pressure, magma chemistry, composition, texture, depth of source rock, and diversification processes. Explore the concepts of anatexis, partial melting, and the enrichment of low and high-temperature components in liquid melt and residual rock.
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