Magmatic Phases - I.

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Presentation transcript:

Magmatic Phases - I

Magmatic Phases - II

Conceptual Models of Silicate Melts From Carmichael et al. 1974

Specific Volume of Pure Water Geothermal Gradient Critical Point From Burnham et al., 1969

Specific Volume of Water vs. Pressure specific volume = 1 / r 0.1 g/cm3 rmagma = 2.2 g/cm3

Magmatic Volatile Reservoirs PH2O < Pf Px = Py = Pz Isostatic = Lithostatic pressure

Water Solubility vs. Pressure “Cold-Seal” bomb Pressure medium Platinum capsule: contains melt + dissolved volatiles To pump to increase pressure From Moore et al., 1998

Depolymerization of Silicate Melts

Speciation of Water in Silicate Melts H2O + O2- = 2OH- in melt in melt From Silver et al., 1990

CO2 Solubility in Silicate Melts aSiO2

Pressure Effects on Volatile-rich Systems

Volatiles and Eruptions

Explosive Eruptions

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