Abstract
Abstract. Granitic rocks related to the formation of Haobugao Zn‐Pb‐Cu‐Sn skarn deposit, Inner Mongolia, China, show unusual low whole‐rock δ18O values down to ‐8.8 % (V‐SMOW), whereas separated quartz crystals from those rocks give positive δ18O values of+4.1 to +9.9 %. Chemical analyses and microscopic observation of those granitic rocks confirm that they suffered hydrothermal alteration. Some skarn specimens and quartz from the Haobugao deposit also show negative δ18O values. The isotopic evidence indicates that intensive meteoric water circulation occurred at the time of granitic intrusion, and caused the pervasive hydrothermal alteration of granitic rocks and the precipitation of skarn deposit in this area.
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