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Abstract
Abstract. The Furong tin orefield, located in southern Hunan, China, is a newly‐discovered super‐large tin orefield. In contrast to most other tin deposits associated with S‐type granites, the Furong tin deposit is closely associated with the Qitianling A‐type granite. The 3He/4He ratios of fluid inclusions in pyrite and arsenopyrite from this orefield range from 0.13 to 2.95 Ra. The influence of various post‐mineralization processes on the helium isotopic composition of ore‐forming fluid inclusions are estimated negligible. Thus, the analytical values of helium isotopic composition basically represent the original values of ore‐forming fluids at the time they were trapped.The 3He/4He ratios of ore‐forming fluids from the Furong orefield indicate the existence of mantle‐source components. It supports the idea that both the Furong tin orefield and Qitianling granite formed under the geodynamic background of mantle upwelling and crustal extension.
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