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Solubility experiments of Mn-columbite (MnNb 2 O 6 ) and Mn-tantalite (MnTa 2 O 6 ) were conducted under water-saturated conditions in synthetic haplogranitic melts containing different amounts of phosphorus at 800 °C and 100 MPa. All experiments were carried out in cold-seal rapid quenching pressure vessels (RQV) with water as a pressure medium. Experimental results show that: (1) the solubilities of MnNb 2 O 6  and MnTa 2 O 6  in peralkaline melts are higher than those in peraluminous melts; (2) phosphorus has strong influence on the solubilities of MnTa 2 O 6  and MnNb 2 O 6  in peralkaline melts,K   Sp    Nb${\rm{K}}_{{\rm{Sp}}}^{{\rm{Nb}}}$    andK   Sp    Ta${\rm{K}}_{{\rm{Sp}}}^{{\rm{Ta}}}$    decrease from 104.89 × 10 –4  mol 2 /kg 2  and 107.62 × 10 –4  mol 2 /kg 2  for melts without P 2 O 5  to 16.11 × 10 –4  mol 2 /kg 2  and 7.96 × 10 –4  mol 2 /kg 2  for melts containing ~4.00 wt% P 2 O 5 , respectively; (3) phosphorus has less influence on the solubilities of MnTa 2 O 6  and MnNb 2 O 6  in peraluminous melt,K   Sp    Nb${\rm{K}}_{{\rm{Sp}}}^{{\rm{Nb}}}$    decrease from 4.50 × 10 –4  mol 2 /kg 2  for melts without P 2 O 5  to 0.73 × 10 –4  mol 2 /kg 2 , and K Sp  Ta  from 3.57 × 10 –4  mol 2 /kg 2  to 0.14 × 10 –4  mol 2 /kg 2  for melts contaning ~5.00 wt% P 2 O 5 . Taking the structural role of phosphorus into account, P decreases the solubility of Mn-columbite and Mn-tantalite via competing for network modifiers.

The effect of phosphorus on manganocolumbite and mangaotantalite solubility in peralkaline to peraluminous granitic melts