Metamorphism of the Moke Creek lode, Otago, New Zealand

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Abstract
A load pressure of 6.4 ± 0.4 kbar is estimated for the metamorphism and reequilibration of the Moke Creek sulphide lode near Queenstown (S132) on the basis of a recently published calibration of the iron content of sphalerite as a geobarometer, and the recognition of equilibrium sulphide textures. This estimate confirms previous estimates of a geothermal gradient of 15–25° c/km during greenschist facies metamorphism in this area of the Haast Schist Terrane. The author suggests a syngenetic origin for the lode.