Sources and Effects of Fluids in Continental Retrograde Shear Zones: Insights from the Kuckaus Mylonite Zone, Namibia

Figure 11

The ranges of δ¹⁸O values determined for samples from the KMZ. Whole rock values are in black, and the quartz veins are in red. Also plotted (in blue) are calculated H₂O compositions for the quartz veins using the fractionation factor of Matsuhisa et al. [66]. Also shown are the ranges of meteoric, metamorphic, and magmatic waters, as well as typical I- and S-type granite and para- and orthogneiss whole rock values. The dashed line part of the para- and orthogneiss ranges are inferred to be affected by secondary processes. The Sierra Crest Shear Zone quartz vein [48] and the Alpine Fault whole rock and H₂O [40] ranges are also shown for comparison. Table of references and δ¹⁸O values for para- and orthogneiss ranges are provided in supplements (Table S4).