x xMELTS information

magmasource.caltech.edu

Spinel Volume Calculator

xMELTS is the next generation MELTS model, being developed as part of an ongoing collaboration. Get advanced online access here to new solid solution models that will be included in xMELTS.

Output

There was a problem with the ordering calculation; please notify the administrator.

General options

Input oxide components, equilibrium conditions (optional) and P-T

	MgO	FeO	Fe₂O₃	Al₂O₃	Cr₂O₃	TiO₂
Wt % oxides:

Input end-member proportions, equilibrium conditions (optional) and P-T

	FeCr₂O₄	FeAl₂O₄	Fe₃O₄	Fe₂TiO₄
Mole fraction:					use MELTS end members
	MgCr₂O₄	MgAl₂O₄	MgFe₂O₄	Mg₂TiO₄

Input site fractions and P-T conditions

	Mg²⁺	Fe²⁺	Fe³⁺	Al³⁺	Cr³⁺	Ti⁴⁺
Tetrahedral site fraction:					N/A	N/A
Octahedral site fraction:

Input MELTS-type variables and P-T conditions

	X_MgAl₂O₄		X_FeCr₂O₄		X_Fe₂TiO₄		X_Fe₃O₄
r₀:		r₁:		r₂:		r₃:

	^[4]X_Mg²⁺−2^[6]X_Mg²⁺		½(2^[6]X_Al³⁺−^[4]X_Al³⁺)		½(2^[6]X_Fe³⁺−^[4]X_Fe³⁺)
s₀:		s₁:		s₂:

Ordering state options

Use input site fractions or MELTS variables

Assume normal ordering i.e. ^[4]A^[6]B₂O₄

Assume inverse ordering within range of configurational freedom e.g. ^[4]B^[6](A,B)₂O₄

Use MELTS ordering model (for T_s ≥ 500 °C)

Temperature (T_s) in °C: same as T_v

Pressure (P_s) in bars: same as P_v

Volume options

Temperature (T_v) in °C:
Pressure (P_v) in bars:

Temperature (T_s) in °C:	same as T_v
Pressure (P_s) in bars:	same as P_v