•Short-wave infrared (SWIR) reflectance spectrometric characterisation of clays from geothermal systems of the Taupō Volcanic Zone.•Spectral characterisation/distinction of smectite, mixed-layered illite-smectite and illite by calibration against clay separate X-ray diffraction.•Recognition volcanic glass present in weakly altered rocks has a spectral signature.•Smectite, illite-smectite and illite useful to infer temperature and the thermal structure of the geothermal systems when these clays formed.•SWIR is a rapid, non-destructive mineral identification technique that can be done during drilling and can be used to identify other key geothermal minerals e.g. epidote, kaolinite, alunite, pyrophyllite, and others.
Geothermics – Elsevier
Published: May 1, 2018
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