Metamorphic low to high 2Vx K‐feldspar in kyanite zone rocks within the Alpine schists of Copland Valley, South Westland, New Zealand

Abstract Metamorphic K‐feldspars (or 90 ab lO ), from the western part of the Alpine schist in Copland Valley, display optical properties indicating average structural states ranging from potassian intermediate sanidine to intermediate microcline. P/T conditions during K‐feldspar production were about 510‐570°C at 7 kbar.Records of high‐temperature assemblages elsewhere in the Alpine schists indicate that metamorphic conditions in the western part of the schist belt were as high as the kyanite zone.