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Helium Isotope Geochemistry of Ore‐forming Fluids from Furong Tin Orefield in Hunan Province, China
Author(s) -
Li Zhaoli,
Hu Ruizhong,
Peng Jiantang,
Bi Xianwu,
Li Xiaomin
Publication year - 2006
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2006.tb00263.x
Subject(s) - geology , tin , geochemistry , fluid inclusions , mineralization (soil science) , mantle (geology) , mineralogy , metallurgy , quartz , materials science , soil science , soil water , paleontology
. 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 3 He/ 4 He 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 3 He/ 4 He 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.