Occurrences of Excess 40Ar in Hydrothermal Tourmaline: Interpretations from 40Ar-39 Ar Dating Results by Stepwise Heating

QIU Huaning, PU Zhiping and DAI Tongmo
2007 Acta Geologica Sinica (English)  
The occurrences of excess 40Ar within a hydrothermal tourmaline is discussed in term of the analysis data of syngenetic muscovite and tourmaline from the Lushui hydrothermal tin-tungsten deposit in western Yunnan, China, using the 4oAr.39Ar stepwise heating technique. About 80% excess 40Ar was released in the last step when the tourmaline was fused, corresponding to a release of only -3 % 39Ar (K), which indicates that most excess 40Ar was held in the mineral lattice rather than in the channels
more » ... parallel to the Z-axis. This suggests that the excess 40Ar was incorporated during crystallization and not diffused into the tourmaline during the post-crystallization history.
doi:10.1111/j.1755-6724.2007.tb00974.x fatcat:l6e2cagihnd75bu5jkhdvknifm