Automatic 40Ar/39Ar Dating Techniques Using Multicollector ARGUS VI Noble Gas Mass Spectrometer with Self-Made Peripheral Apparatus
A new fully automatic 40Ar/39Ar laboratory with a Thermo Scientific© ARGUS VI mass spectrometer has been established in China University of Geosciences (Wuhan). We designed and developed a mini efficient preparation system (80 mL), a CO2 laser for heating samples, a crusher for extracting fluid inclusions within K-poor minerals and an air reservoir (31 L) and pipette (0.1 mL) system. The ARGUS VI mass spectrometer is operated by the Qtegra Noble Gas software, which can control the peripheral accessories, such as pneumatic valves, CO2 laser and crusher through a PeriCon (peripheral controller). The experimental procedures of atmospheric argon analyses, 40Ar/39Ar dating by laser stepwise heating and by progressive crushing in vacuo, can be fully automatically performed. The weighted mean of atmospheric 40Ar/36Ar ratios is 302.22±0.03 (1σ, MSWD=0.74, n=200), indicating that air reservoir and pipette system and the whole instrument system are very stable. This laboratory is a successful pioneer example in China to establish a new noble gas laboratory with self-made peripheral accessories expect for the mass spectrometer.
Key words40Ar/39Ar dating fully automatic CO2 laser ARGUS VI mass spectrometer Qtegra noble gas software
Unable to display preview. Download preview PDF.
We thank two anonymous reviewers for their valuable comments that improved this manuscript. This study was financially supported by the National Natural Science Foundation of China (Nos. 41503053, 41630315, 41688103, and 91128203). The final publication is available at Springer via https://doi.org/10.1007/s12583-017-0948-9.
- Dalrymple, G. B., Alexander, E. C., Lanphere, M. A., et al., 1981. Irradiation of Samples for 40Ar/39Ar Dating Using the Geological Survey Triga Reactor. Professional Paper 1176. U. S. Geol. Surv., WashingtonGoogle Scholar
- Jiang, Y. D., Qiu, H. N., Xu, Y. G., 2012. Hydrothermal Fluids, Argon Isotopes and Mineralization Ages of the Fankou Pb-Zn Deposit in South China: Insights from Sphalerite 40Ar/39Ar Progressive Crushing. Geochimica et Cosmochimica Acta, 84: 369–379. https://doi.org/10.1016/j.gca.2012.01.044CrossRefGoogle Scholar
- Kendrick, M. A., Burgess, R., Pattrick, R. A. D., et al., 2001. Halogen and Ar-Ar Age Determinations of Inclusions within Quartz Veins from Porphyry Copper Deposits Using Complementary Noble Gas Extraction Techniques. Chemical Geology, 177(3/4): 351–370. https://doi.org/10.1016/s0009-2541(00)00419-8CrossRefGoogle Scholar
- Lederer, C. M., Shirley, V. S. E., 1978. Table of Isotopes, 7th Ed. Wiley, New YorkGoogle Scholar
- Mark, D. F., Barfod, D., Stuart, F. M., et al., 2009. The ARGUS Multicollector Noble Gas Mass Spectrometer: Performance for 40Ar/39Ar Geochronology. Geochemistry, Geophysics, Geosystems, 10(10). https://doi.org/10.1029/2009gc002643Google Scholar
- McDougall, I., Harrison, T. M., 1999. Geochronology and Termochronology by the 40Ar/39Ar Method (2nd Edition). Oxford University Press, New YorkGoogle Scholar
- Pfänder, J. A., Sperner, B., Ratschbacher, L., et al., 2014. High-Resolution 40Ar/39Ar Dating Using a Mechanical Sample Transfer System Combined with a High-Temperature Cell for Step Heating Experiments and a Multicollector ARGUS Noble Gas Mass Spectrometer. Geochemistry, Geophysics, Geosystems, 15(6): 2713–2726. https://doi.org/10.1002/2014gc005289CrossRefGoogle Scholar
- Qiu, H. N., Bai, X. J., Liu, W. G., et al., 2015. Automatic 40Ar/39Ar Dating Technique Using Multicollector ARGUSvi Ms with Home-Made Apparatus. Geochimica, 44(5): 477–484 (in Chinese with English Abstract)Google Scholar
- Sigurgeirsson, T., 1962. Age Dating of Young Basalts with the Potassium-Argon Method (in Icelandic). Unpublished Report Physics Laboratory. University of Iceland, IcelandGoogle Scholar
- Turrin, B. D., Swisher, C. C. III, Deino, A. L., 2010. Mass Discrimination Monitoring and Intercalibration of Dual Collectors in Noble Gas Mass Spectrometer Systems. Geochemistry, Geophysics, Geosystems, 11(8). https://doi.org/10.1029/2009gc003013Google Scholar
- Wang, M., Bai, X. J., Hu, R. G., et al., 2015. Direct Dating of Cassiterite in Xitian Tungsten-Tin Polymetallic Deposit, South-East Hunan, by 40Ar/39Ar Progressive Crushing. Geotectonica et Metallogenia, 39(6): 1049–1060 (in Chinese with English Abstract)Google Scholar
- Wang, M., Bai, X. J., Yun, J. B., et al., 2016. 40Ar/39Ar Dating of Mineralization of Shizhuyuan Polymetallic Deposit. Geochimica, 45(1): 41–51 (in Chinese with English Abstract)Google Scholar