Phlogopite partition coefficient

Figure 21. Fits of lattice strain model to experimental phlogopite-melt partition coefficients for 1+ and 2+ cations on the large X-site for mn 6+6 of Icenhower and London (1995) at 0.2 GPa and 650°C. 1+ data can be readily fitted 2+ data were fitted by assuming that = lE = 100 GPa. Note that r (x) is slightly larger than rsa, making this site ided for incorporation of Ra. Errors bars, when larger than symbol, are 1 s.d. Ionic radii in Xll-fold coordination are taken from Shaimon (1976).

There are no noble gas partition coefficients for phlogopite. The large size and low mean charge of the large X-site (Zg )) suggest that noble gases could be readily incorporated into phlogopite. 

Foley SF, Jackson SE, Fryer BJ, Greenough JD, Jenner GA (1996) Trace element partition coefficients for clinopyroxene and phlogopite in an alkaline lamprophyre from Newfoundland by LAM-ICP-MS. Geochim Cosmochim Acta 60 629-638... 

Trioctahedral micas, such as phlogopite or biotite, are characterized by four distinct cation lattice sites tetrahedral (Z) sites occupied by silicon and aluminum octahedral (Y) sites, denoted Ml and M2, occupied by Al, Cr, Fe +, Ti, Fe +, Mg, and Mn and a large 12-fold coordinated interlayer X-site occupied by potassium, sodium, calcium, and other large cations. The low partition coefficients for lanthanides, uranium and thorium in phlogopite (<2X 10 ) indicate, however, that large highly charged cations cannot... 

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