Abstract
(Mg 1.461 V 0.679 Al 0.771 Fe 0.042 Mn 0.003 Ti 0.043 ) Z (Al 5.074 V 0.237 Mg 0.689 ) T (Si 5.782 Al 0.218 O 18 ) (BO 3 ) 3 ((OH) 3.058 O 0.75 F 0.192 ) for GVD and X (Na 0.539 Ca 0.148 □ 0.297 K 0.017 ) Y (Mg 0.992 V 0.302 Al 1.039 Fe 0.582 Mn 0.011 Ti 0.068 Cr 0.007 ) Z (Al 5.339 V 0.082 Mg 0.578 ) T (Si 5.864 Al 0.136 O 18 ) (BO 3 ) 3 ((OH) 3.209 O 0.621 F 0.171 ) for BVD, respectively. Both types of V-rich oxy-dravite feature Al-Mg-V disorder between the Y and Z sites; V and Cr are preferentially located at the Y site. The V-rich oxy-dravite from Bitovanky has unusually high Ca contents and high proportion of vacancy at the X site. Most common trace ele- ments include Ti, Cr, Mn, Zn, Sc, Ga, Sr, Ni, Sn, and LREE. High concentrations of V, Cr and Ti (as well as elevated Mn, Zn, Sc, Sn, and Sr) in the GVD and late BVD most probably result from hydrothermal dissolution of (Ti,V)-oxides and other accessory phases during a high-grade metamorphic overprinting of the host graphite quartzite assemblage.
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