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

Figure 8

Strontium and neodymium isotopes. (a) Measured in situ ⁸⁷Sr/⁸⁶Sr of carbonate phases (the grey area, see (b) for data) compared to age-corrected (20 Ma) measured whole-rock ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd from the greyschist, altered greyschist, and hydrothermal breccia. Published in-situ ⁸⁷Sr/⁸⁶Sr for epidote are plotted for comparison [11, 24]. (b) Individual in situ ⁸⁷Sr/⁸⁶Sr isotope data of the different types of carbonate phases from Akatore Creek and Bruce Rocks. The grey boxes represent the weighted average Sr isotope ratio with errors from each group of samples.

(a)

(b)