Abstract
Shear zones at Broken Hill, Australia, are highly deformed structures that have provided a focus for migrating aqueous fluids, resulting in the widespread retrogression of rocks within and adjacent to their boundaries. Shearing probably occurred soon after regional metamorphism at greenschist to lower amphibolite facies. Lowering of δ18O values in the range of 10–12‰ in metasedimentary host rocks to 7–8‰ in sheared metasediments suggests that isotopic exchange occurred due to pervasive fluid flow. Time integrated fluid fluxes of 1–7×106m3/m2 and calculated metasomatism suggest that retrograde shear zones were enriched in silica and were subjected to a high degree of fluid flow. This is consistent with petrographic observations showing the crystallisation of abundant quartz and muscovite.
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