Structural Controls on Shallow Cenozoic Fluid Flow in the Otago Schist, New Zealand

Figure 9

δ¹³C_VPDB ‰ and δ¹⁸O_SMOW ‰ of carbonates from Akatore Creek and Bruce Rocks, compared with the fields for primary metamorphic calcite and shallow hydrothermal calcite in the Southern Alps of New Zealand [10]. Remobilisation and recrystallisation of metamorphic calcite and precipitation at a lower temperature are interpreted to have caused an increase in δ¹⁸O_SMOW ‰ (indicated by arrow).