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We present a method to measure carbonate content of apatite that uses infrared spectroscopy, The method was calibrated against the amount of CO 2  released by reaction of apatite with phosphoric acid and may be used to study apatite with CO 2  content below I wt%. We have applied the method to apatite from carbonatite (≈0.3-0.4 wt% CO 2 ) and metasomatic (≈0.6-1.0 wt% CO 2 ) and alkaline silicate (&lt;0.3 wt% CO 2 ) rocks from the Jacupiranga alkaline complex. The results show that higher concentration of carbonate was found in apatite related to metasomatic processes and, in particular, to metasomatism related to the intrusion of carbonatite from J acupiranga. Major and trace elements of the analyzed apatites do not show a simple substitution mechanism that would explain the presence of carbonate in the apatite structure.

The carbonate content in high-temperature apatite: An analytical method applied to apatite from the Jacupiranga alkaline complex