INTRODUCTION TO SILICATE MELTS AND MAGMAS

• It is completely or partially molten material beneath the Earth's surface

  Magma
• Intrusive magmas cool slowly because they have no direct contact with air; this allows them time to crystallize into large masses of solid rock.
• Mafic magmas are richer in iron-magnesium silicates and poorer in aluminum silicates compared to felsic magmas.
• What is liquidus?

  the lowest temperature at which an alloy is completely liquid
• Enumerate the generation of magmas

  Increase in T to reach melting point, Decrease in pressure (adiabatic decompression, & addition of volatiles