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

Figure 7

Whole-rock mass-balance calculations. (a) Outcrop at Bruce Rocks where samples were collected from unaltered grayschist (samples 1-3), altered greyschist from within carbonate alteration zones (samples 4-6), and fault breccia (samples 7-8). (b) Whole-rock geochemistry of the altered greyschist compared to the average of three unaltered greyschist samples (BRWR-1:3). Values higher than one are gained during alteration, and anything below one has been lost. The figure shows mobilization of Fe₂O₃, CaO, MgO, and MnO together with Sr, Y, and REE.

(a)

(b)